Android 高仿微信发朋友圈浏览图片效果

最后更新于:2022-04-01 15:54:53

最近一直在高仿微信、高仿微信,今天小编再给大家分享一个仿微信发朋友圈浏览图片的效果.... 好了,先看一下效果吧: ![这里写图片描述](https://docs.gechiui.com/gc-content/uploads/sites/kancloud/2016-04-18_57144ed848f8a.jpg "") 下面就来说一下具体怎么实现的: ###实现思路 1.首先我们要获取数据源,数据源就是我们的每条说说(包括姓名、标题、图片数组) 2.自定义适配器(ListView嵌套着GridView) 3.图片点击浏览图片(Fragment+ViewPager) ###具体实现 1.初始化数据源,设置适配器,看一下代码: ~~~ public class MyActivity extends Activity { /*图片显示列表*/ private ListView listView; /*图片URL数组*/ private List<ContentBean> contentBeans; /*说说适配器*/ private MyAdapter adapter; /** * Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); initData(); initViews(); } /** * 初始化数据 * by Hankkin at:2015-11-22 23:21:28 */ private void initData(){ contentBeans = new ArrayList<ContentBean>(); ArrayList<String> imgUrls1 = new ArrayList<String>(); imgUrls1.add("http://7xojuc.com1.z0.glb.clouddn.com/110H2E40-6.jpg?attname=&e=1448288962&token=KDsCqUAWz3P-YT6In6oPnT56Eh2cig4zgQd12SJ_:AlTjfYD9SBFOdB4jmmZuKXAMOp8"); ContentBean cb1 = new ContentBean(1,"java","Sun Microsystems",imgUrls1); contentBeans.add(cb1); ArrayList<String> imgUrls2 = new ArrayList<String>(); imgUrls2.add("http://7xojuc.com1.z0.glb.clouddn.com/110H2E40-6.jpg?attname=&e=1448288962&token=KDsCqUAWz3P-YT6In6oPnT56Eh2cig4zgQd12SJ_:AlTjfYD9SBFOdB4jmmZuKXAMOp8"); imgUrls2.add("http://7xojuc.com1.z0.glb.clouddn.com/110H2E40-6.jpg?attname=&e=1448288962&token=KDsCqUAWz3P-YT6In6oPnT56Eh2cig4zgQd12SJ_:AlTjfYD9SBFOdB4jmmZuKXAMOp8"); imgUrls2.add("http://7xojuc.com1.z0.glb.clouddn.com/110H2E40-6.jpg?attname=&e=1448288962&token=KDsCqUAWz3P-YT6In6oPnT56Eh2cig4zgQd12SJ_:AlTjfYD9SBFOdB4jmmZuKXAMOp8"); ContentBean cb2 = new ContentBean(2,"OC","Stepstone",imgUrls2); contentBeans.add(cb2); ArrayList<String> imgUrls3 = new ArrayList<String>(); imgUrls3.add("http://7xojuc.com1.z0.glb.clouddn.com/110H2E40-6.jpg?attname=&e=1448288962&token=KDsCqUAWz3P-YT6In6oPnT56Eh2cig4zgQd12SJ_:AlTjfYD9SBFOdB4jmmZuKXAMOp8"); imgUrls3.add("http://7xojuc.com1.z0.glb.clouddn.com/110H2E40-6.jpg?attname=&e=1448288962&token=KDsCqUAWz3P-YT6In6oPnT56Eh2cig4zgQd12SJ_:AlTjfYD9SBFOdB4jmmZuKXAMOp8"); imgUrls3.add("http://7xojuc.com1.z0.glb.clouddn.com/110H2E40-6.jpg?attname=&e=1448288962&token=KDsCqUAWz3P-YT6In6oPnT56Eh2cig4zgQd12SJ_:AlTjfYD9SBFOdB4jmmZuKXAMOp8"); imgUrls3.add("http://7xojuc.com1.z0.glb.clouddn.com/110H2E40-6.jpg?attname=&e=1448288962&token=KDsCqUAWz3P-YT6In6oPnT56Eh2cig4zgQd12SJ_:AlTjfYD9SBFOdB4jmmZuKXAMOp8"); imgUrls3.add("http://7xojuc.com1.z0.glb.clouddn.com/110H2E40-6.jpg?attname=&e=1448288962&token=KDsCqUAWz3P-YT6In6oPnT56Eh2cig4zgQd12SJ_:AlTjfYD9SBFOdB4jmmZuKXAMOp8"); imgUrls3.add("http://7xojuc.com1.z0.glb.clouddn.com/110H2E40-6.jpg?attname=&e=1448288962&token=KDsCqUAWz3P-YT6In6oPnT56Eh2cig4zgQd12SJ_:AlTjfYD9SBFOdB4jmmZuKXAMOp8"); imgUrls3.add("http://7xojuc.com1.z0.glb.clouddn.com/110H2E40-6.jpg?attname=&e=1448288962&token=KDsCqUAWz3P-YT6In6oPnT56Eh2cig4zgQd12SJ_:AlTjfYD9SBFOdB4jmmZuKXAMOp8"); imgUrls3.add("http://7xojuc.com1.z0.glb.clouddn.com/110H2E40-6.jpg?attname=&e=1448288962&token=KDsCqUAWz3P-YT6In6oPnT56Eh2cig4zgQd12SJ_:AlTjfYD9SBFOdB4jmmZuKXAMOp8"); imgUrls3.add("http://7xojuc.com1.z0.glb.clouddn.com/110H2E40-6.jpg?attname=&e=1448288962&token=KDsCqUAWz3P-YT6In6oPnT56Eh2cig4zgQd12SJ_:AlTjfYD9SBFOdB4jmmZuKXAMOp8"); ContentBean cb3 = new ContentBean(3,"python","Guido van Rossum",imgUrls3); contentBeans.add(cb3); } /** * 初始化组件 * by Hankkin at:2015-11-22 23:21:44 */ private void initViews(){ listView = (ListView) findViewById(R.id.lv_my); adapter = new MyAdapter(MyActivity.this,contentBeans); listView.setAdapter(adapter); } } ~~~ 这里面的图片是我上传到七牛的网络图片,加载图片是用ImageLoader,下面也有具体的ImageLoader配置。 2.看一下适配器内容 在说说列表适配器中去设置图片的适配器,图片的GridView是重写了一个不能滑动的GridView,重写一下OnMeasure(); ~~~ public class MyAdapter extends BaseAdapter { private Context context; private List<ContentBean> data; public MyAdapter(Context context, List<ContentBean> data) { this.context = context; this.data = data; } @Override public int getCount() { return data.size(); } @Override public Object getItem(int i) { return data.get(i); } @Override public long getItemId(int i) { return i; } @Override public View getView(int i, View view, ViewGroup viewGroup) { ViewHolder holder; if (view == null) { holder = new ViewHolder(); view = View.inflate(context, R.layout.item, null); holder.gridView = (NoScrollGridView) view.findViewById(R.id.gridview); holder.tvName = (TextView) view.findViewById(R.id.tv_name); holder.tvTitle = (TextView) view.findViewById(R.id.tv_title); view.setTag(holder); } else { holder = (ViewHolder) view.getTag(); } final ContentBean bean = data.get(i); holder.tvName.setText(bean.getName()); holder.tvTitle.setText(bean.getTitle()); if (data != null && data.size() > 0) { holder.gridView.setAdapter(new ImageGridAdapter(context, bean.getImgUrls())); } /** * 图片列表点击事件 */ holder.gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) { Intent intent = new Intent(context, ImagePagerActivity.class); intent.putExtra(ImagePagerActivity.EXTRA_IMAGE_URLS, (Serializable) bean.getImgUrls()); intent.putExtra(ImagePagerActivity.EXTRA_IMAGE_INDEX, i); context.startActivity(intent); } }); return view; } class ViewHolder { TextView tvName, tvTitle; NoScrollGridView gridView; } } ~~~ 3.然后就是图片浏览,这个网上也有好多的Demo,也有详细的讲解,直接拽过来用就可以了,下面的图片数量是监听setOnPageChangeListener()来改变下面的图片索引值 ~~~ /** * 图片查看器 * Created by Hankkin on 15/11/22. */ public class ImagePagerActivity extends FragmentActivity { private static final String STATE_POSITION = "STATE_POSITION"; public static final String EXTRA_IMAGE_INDEX = "image_index"; public static final String EXTRA_IMAGE_URLS = "image_urls"; private HackyViewPager mPager; private int pagerPosition; private TextView indicator; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.image_detail_pager); pagerPosition = getIntent().getIntExtra(EXTRA_IMAGE_INDEX, 0); ArrayList<String> urls = getIntent().getStringArrayListExtra(EXTRA_IMAGE_URLS); mPager = (HackyViewPager) findViewById(R.id.pager); ImagePagerAdapter mAdapter = new ImagePagerAdapter(getSupportFragmentManager(), urls); mPager.setAdapter(mAdapter); indicator = (TextView) findViewById(R.id.indicator); CharSequence text = getString(R.string.viewpager_indicator, 1, mPager.getAdapter().getCount()); indicator.setText(text); // 更新下标 mPager.setOnPageChangeListener(new OnPageChangeListener() { @Override public void onPageScrollStateChanged(int arg0) { } @Override public void onPageScrolled(int arg0, float arg1, int arg2) { } @Override public void onPageSelected(int arg0) { CharSequence text = getString(R.string.viewpager_indicator, arg0 + 1, mPager.getAdapter().getCount()); indicator.setText(text); } }); if (savedInstanceState != null) { pagerPosition = savedInstanceState.getInt(STATE_POSITION); } mPager.setCurrentItem(pagerPosition); } @Override public void onSaveInstanceState(Bundle outState) { outState.putInt(STATE_POSITION, mPager.getCurrentItem()); } private class ImagePagerAdapter extends FragmentStatePagerAdapter { public ArrayList<String> fileList; public ImagePagerAdapter(FragmentManager fm, ArrayList<String> fileList) { super(fm); this.fileList = fileList; } @Override public int getCount() { return fileList == null ? 0 : fileList.size(); } @Override public Fragment getItem(int position) { String url = fileList.get(position); return ImageDetailFragment.newInstance(url); } } } ~~~ 图片Fragment的详细界面,里面有长按点击事件,和图片加载的状态 ~~~ package com.hankkin.WeiXinLookImgsDemo.activty; import android.graphics.Bitmap; import android.os.Bundle; import android.support.v4.app.Fragment; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ImageView; import android.widget.ProgressBar; import android.widget.Toast; import com.hankkin.WeiXinLookImgsDemo.R; import com.nostra13.universalimageloader.core.ImageLoader; import com.nostra13.universalimageloader.core.assist.FailReason; import com.nostra13.universalimageloader.core.listener.SimpleImageLoadingListener; import com.others.PhotoViewAttacher; /** * 单张图片显示Fragment * Created by Hankkin on 15/11/22. */ public class ImageDetailFragment extends Fragment { private String mImageUrl; private ImageView mImageView; private ProgressBar progressBar; private PhotoViewAttacher mAttacher; public static ImageDetailFragment newInstance(String imageUrl) { final ImageDetailFragment f = new ImageDetailFragment(); final Bundle args = new Bundle(); args.putString("url", imageUrl); f.setArguments(args); return f; } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); mImageUrl = getArguments() != null ? getArguments().getString("url") : null; } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { final View v = inflater.inflate(R.layout.image_detail_fragment, container, false); mImageView = (ImageView) v.findViewById(R.id.image); mAttacher = new PhotoViewAttacher(mImageView); mAttacher.setOnPhotoTapListener(new PhotoViewAttacher.OnPhotoTapListener() { @Override public void onPhotoTap(View arg0, float arg1, float arg2) { getActivity().finish(); } }); mAttacher.setOnLongClickListener(new View.OnLongClickListener() { @Override public boolean onLongClick(View view) { Toast.makeText(getActivity().getApplicationContext(),"保存",Toast.LENGTH_SHORT).show(); return false; } }); progressBar = (ProgressBar) v.findViewById(R.id.loading); return v; } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); ImageLoader.getInstance().displayImage(mImageUrl, mImageView, new SimpleImageLoadingListener() { @Override public void onLoadingStarted(String imageUri, View view) { progressBar.setVisibility(View.VISIBLE); } @Override public void onLoadingFailed(String imageUri, View view, FailReason failReason) { String message = null; switch (failReason.getType()) { case IO_ERROR: message = "下载错误"; break; case DECODING_ERROR: message = "图片无法显示"; break; case NETWORK_DENIED: message = "网络有问题,无法下载"; break; case OUT_OF_MEMORY: message = "图片太大无法显示"; break; case UNKNOWN: message = "未知的错误"; break; } Toast.makeText(getActivity(), message, Toast.LENGTH_SHORT).show(); progressBar.setVisibility(View.GONE); } @Override public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) { progressBar.setVisibility(View.GONE); mAttacher.update(); } }); } } ~~~ 忘了ImageLoader的初始化工作了,给大家加上吧,我写到Application里了 ~~~ private MyApplication context; @Override public void onCreate() { super.onCreate(); context = this; initImageLoader(context); } /** * 初始化Imageloader * by Hankkin at:2015-11-22 23:20:29 * @param context */ public static void initImageLoader(Context context){ DisplayImageOptions options = new DisplayImageOptions.Builder() .showImageOnLoading(R.drawable.ic_launcher) .showImageOnFail(R.drawable.ic_launcher) .resetViewBeforeLoading(false) // default .delayBeforeLoading(0) .cacheInMemory(true) // default .cacheOnDisk(true) // default .considerExifParams(true) // default .imageScaleType(ImageScaleType.IN_SAMPLE_POWER_OF_2) // default .bitmapConfig(Bitmap.Config.ARGB_8888) // default .displayer(new SimpleBitmapDisplayer()) // default .handler(new Handler()) // default .build(); File picPath = new File(Environment.getExternalStorageDirectory().getPath() + File.separator + "weixinlookimgdemo" + File.separator + "files"); ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(context) .memoryCacheExtraOptions(480, 800) // default = device screen dimensions .diskCacheExtraOptions(480, 800, null) .threadPoolSize(3) // default .threadPriority(Thread.NORM_PRIORITY - 1) // default .tasksProcessingOrder(QueueProcessingType.FIFO) // default .denyCacheImageMultipleSizesInMemory() .memoryCache(new LruMemoryCache(2 * 1024 * 1024)) .memoryCacheSize(2 * 1024 * 1024) .memoryCacheSizePercentage(13) // default .diskCache(new UnlimitedDiscCache(picPath)) // default .diskCacheSize(50 * 1024 * 1024) .diskCacheFileCount(1000) .diskCacheFileNameGenerator(new HashCodeFileNameGenerator()) // default .imageDownloader(new BaseImageDownloader(context)) // default .imageDecoder(new BaseImageDecoder(true)) // default .defaultDisplayImageOptions(options) // default .writeDebugLogs() .build(); // Initialize ImageLoader with configuration. ImageLoader.getInstance().init(config); } ~~~ 这个效果就很容易实现了,揣摩别人的APP很容易,但是我们要试着去实现别人的APP,生命在于折腾,折腾吧,亲们….. 最后小编把源码上传到了Github上,宝贝们,star吧 [https://github.com/Hankkin/WeiXinLookImgsDemo](https://github.com/Hankkin/WeiXinLookImgsDemo)
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Android 高仿微信群聊头像

最后更新于:2022-04-01 15:54:51

最近小编搞了一个仿微信群聊头像的一个功能,分享给大家... 工作中需要实现仿钉钉群头像的一个功能,就是个人的头像拼到一起显示,看了一下市场上的APP好像微信的群聊头像是组合的,QQ的头像不是,别的好像也没有了。今天给大家分享一下怎么实现的吧。首先我们先看一下效果图: ![这里写图片描述](https://docs.gechiui.com/gc-content/uploads/sites/kancloud/2016-04-18_57144ed7e8c6b.jpg "") 好了,下面说一下具体怎么实现的: ### 实现思路 1.首先获取Bitmap图片(本地、网络) 2.创建一个指定大小的缩略图 3.组合Bitmap图片 很简单,本地图片需要我们从本地读取,如果是网络图片我们也可以根据URL来获取bitmap进行组合 ### 具体实现过程 1.布局文件: ~~~ <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" android:gravity="center" android:orientation="vertical" android:background="#987" android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity"> <TextView android:background="#fff" android:layout_width="match_parent" android:layout_height="1dp"/> <ImageView android:src="@drawable/j" android:id="@+id/iv1" android:layout_width="wrap_content" android:layout_height="wrap_content" /> <TextView android:background="#fff" android:layout_width="match_parent" android:layout_height="1dp"/> <ImageView android:src="@drawable/j" android:id="@+id/iv2" android:layout_width="wrap_content" android:layout_height="wrap_content" /> <TextView android:background="#fff" android:layout_width="match_parent" android:layout_height="1dp"/> <ImageView android:src="@drawable/j" android:id="@+id/iv3" android:layout_width="wrap_content" android:layout_height="wrap_content" /> <TextView android:background="#fff" android:layout_width="match_parent" android:layout_height="1dp"/> <ImageView android:src="@drawable/j" android:id="@+id/iv4" android:layout_width="wrap_content" android:layout_height="wrap_content" /> <TextView android:background="#fff" android:layout_width="match_parent" android:layout_height="1dp"/> </LinearLayout> ~~~ 四个ImageView控件,用来显示图片不说了 2.获取Bitmap,设定图片的属性 ~~~ /** * 获取图片数组实体 * by Hankkin at:2015-11-19 22:00:55 * @param count * @return */ private List<BitmapBean> getBitmapEntitys(int count) { List<BitmapBean> mList = new ArrayList<>(); String value = PropertiesUtil.readData(this, String.valueOf(count), R.raw.data); String[] arr1 = value.split(";"); int length = arr1.length; for (int i = 0; i < length; i++) { String content = arr1[i]; String[] arr2 = content.split(","); BitmapBean entity = null; for (int j = 0; j < arr2.length; j++) { entity = new BitmapBean(); entity.setX(Float.valueOf(arr2[0])); entity.setY(Float.valueOf(arr2[1])); entity.setWidth(Float.valueOf(arr2[2])); entity.setHeight(Float.valueOf(arr2[3])); } mList.add(entity); } return mList; } ~~~ 3.创建压缩图片,这里我们用到了ThumbnailUtils中的extractThumbnail()方法,参数为bitmap,width,height ~~~ /** * 初始化数据 * by Hankkin at:2015-11-19 21:59:03 */ private void initData(){ /*获取四个图片数组*/ bitmapBeans1 = getBitmapEntitys(1); bitmapBeans2 = getBitmapEntitys(2); bitmapBeans3 = getBitmapEntitys(3); bitmapBeans4 = getBitmapEntitys(4); /*bitmap缩略图*/ Bitmap[] bitmaps1 = { ThumbnailUtils.extractThumbnail(BitmapUtils.getScaleBitmap( getResources(), R.drawable.j), (int) bitmapBeans1 .get(0).getWidth(), (int) bitmapBeans1.get(0).getWidth())}; Bitmap[] bitmaps2 = { ThumbnailUtils.extractThumbnail(BitmapUtils.getScaleBitmap( getResources(), R.drawable.j), (int) bitmapBeans2 .get(0).getWidth(), (int) bitmapBeans2.get(0).getWidth()), ThumbnailUtils.extractThumbnail(BitmapUtils.getScaleBitmap( getResources(), R.drawable.j), (int) bitmapBeans2 .get(0).getWidth(), (int) bitmapBeans2.get(0).getWidth())}; Bitmap[] bitmaps3 = { ThumbnailUtils.extractThumbnail(BitmapUtils.getScaleBitmap( getResources(), R.drawable.j), (int) bitmapBeans3 .get(0).getWidth(), (int) bitmapBeans3.get(0).getWidth()), ThumbnailUtils.extractThumbnail(BitmapUtils.getScaleBitmap( getResources(), R.drawable.j), (int) bitmapBeans3 .get(0).getWidth(), (int) bitmapBeans3.get(0).getWidth()), ThumbnailUtils.extractThumbnail(BitmapUtils.getScaleBitmap( getResources(), R.drawable.j), (int) bitmapBeans3 .get(0).getWidth(), (int) bitmapBeans3.get(0).getWidth())}; Bitmap[] bitmaps4 = { ThumbnailUtils.extractThumbnail(BitmapUtils.getScaleBitmap( getResources(), R.drawable.j), (int) bitmapBeans4 .get(0).getWidth(), (int) bitmapBeans4.get(0).getWidth()), ThumbnailUtils.extractThumbnail(BitmapUtils.getScaleBitmap( getResources(), R.drawable.j), (int) bitmapBeans4 .get(0).getWidth(), (int) bitmapBeans4.get(0).getWidth()), ThumbnailUtils.extractThumbnail(BitmapUtils.getScaleBitmap( getResources(), R.drawable.j), (int) bitmapBeans4 .get(0).getWidth(), (int) bitmapBeans4.get(0).getWidth()), ThumbnailUtils.extractThumbnail(BitmapUtils.getScaleBitmap( getResources(), R.drawable.j), (int) bitmapBeans4 .get(0).getWidth(), (int) bitmapBeans4.get(0).getWidth())}; } ~~~ 4.组合bitmap图片(也就是将我们的图片用Canvas画到一起) ~~~ /** * 获得合在一起的bitmap * @param mEntityList * @param bitmaps * @return */ public static Bitmap getCombineBitmaps(List<BitmapBean> mEntityList, Bitmap... bitmaps) { Bitmap newBitmap = Bitmap.createBitmap(200, 200, Bitmap.Config.ARGB_8888); for (int i = 0; i < mEntityList.size(); i++) { bitmaps[i] = GetRoundedCornerBitmap(bitmaps[i]); newBitmap = mixtureBitmap(newBitmap, bitmaps[i], new PointF( mEntityList.get(i).getX(), mEntityList.get(i).getY())); } return newBitmap; } ~~~ 这里我为了好看将图片设置成圆形的了 ~~~ /** * 获取圆形的bitmap * @param bitmap * @return */ public static Bitmap GetRoundedCornerBitmap(Bitmap bitmap) { try { Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Bitmap.Config.ARGB_8888); Canvas canvas = new Canvas(output); final Paint paint = new Paint(); final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight()); final RectF rectF = new RectF(new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight())); final float roundPx = 50; paint.setAntiAlias(true); canvas.drawARGB(0, 0, 0, 0); paint.setColor(Color.BLACK); canvas.drawRoundRect(rectF, roundPx, roundPx, paint); paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN)); final Rect src = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight()); canvas.drawBitmap(bitmap, src, rect, paint); return output; } catch (Exception e) { return bitmap; } } ~~~ 最后开画 ~~~ /** * 画bitmap * @param first * @param second * @param fromPoint * @return */ public static Bitmap mixtureBitmap(Bitmap first, Bitmap second, PointF fromPoint) { if (first == null || second == null || fromPoint == null) { return null; } Bitmap newBitmap = Bitmap.createBitmap(first.getWidth(), first.getHeight(), Bitmap.Config.ARGB_8888); Canvas cv = new Canvas(newBitmap); cv.drawBitmap(first, 0, 0, null); cv.drawBitmap(second, fromPoint.x, fromPoint.y, null); cv.save(Canvas.ALL_SAVE_FLAG); //保存全部图层 cv.restore(); return newBitmap; } ~~~ 这样就简单的实现了微信群聊头像的效果,当然需要对图片做一些处理,已防止OOM,你也可以将它自定义成一个View组件,小编有时间的话会实现这个的。 最后再给大家看一下小编项目上实现的效果吧,没啥区别,只不多数据源不一样了,是从网络上获取的。 小编已经把代码上传导github上了,求大家star啊 [https://github.com/Hankkin/WeixinGroupIconDemo](https://github.com/Hankkin/WeixinGroupIconDemo) ![这里写图片描述](https://docs.gechiui.com/gc-content/uploads/sites/kancloud/2016-04-18_57144ed815813.jpg "")
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Android 百度地图SDK 实现获取周边位置POI

最后更新于:2022-04-01 15:54:49

### 绪论 好久没写博客了,最近比较忙,闲下来写写博客,把小编最近用过的东西跟大家分享一下,记得上次写过一篇百度地图实现定位功能的博客,今天给大家分享一下定位之后获取周边地理位置的实现。 如果你还不知道怎么定位,看一下这里: [Android 轻松实现百度地图定位](http://blog.csdn.net/lyhhj/article/details/49129865) 好了先看一下实现效果怎么样吧? ![这里写图片描述](https://docs.gechiui.com/gc-content/uploads/sites/kancloud/2016-04-18_57144ed779e76.jpg "") ### 实现 ### 1.布局文件 ~~~ <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> <RelativeLayout android:layout_width="match_parent" android:layout_height="@dimen/height_top_bar" android:background="@color/common_top_bar_dark" android:gravity="center_vertical"> <Button android:id="@+id/btn_location_back" android:layout_width="wrap_content" android:layout_height="match_parent" android:drawableLeft="@drawable/back" android:text="@string/top_back" style="@style/btn_title_bar" android:layout_alignParentLeft="true" android:onClick="back" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:text="@string/location_message" style="@style/txt_titlebar_message"/> <Button android:id="@+id/btn_location_ok" android:layout_width="52dp" android:layout_height="match_parent" android:layout_alignParentRight="true" android:background="@drawable/common_tab_bg" android:text="@string/txt_queding" style="@style/btn_title_bar"/> </RelativeLayout> <com.baidu.mapapi.map.MapView android:layout_weight="2" android:id="@+id/mapview_location" android:layout_width="fill_parent" android:layout_height="match_parent" android:clickable="true" /> <ListView android:layout_weight="3" android:id="@+id/lv_location_nearby" android:layout_width="match_parent" android:layout_height="match_parent"/> </LinearLayout> ~~~ ![这里写图片描述](https://docs.gechiui.com/gc-content/uploads/sites/kancloud/2016-04-18_57144ed7c8292.jpg "") 布局文件就是上面是一个百度地图的mapview,下面是一个显示周边位置的ListView,很简单。 ### 自动定位 我们先看一下根据自己的地理位置实现定位 1.首先初始化要用到的组件 ~~~ /** * 初始化组件 * by黄海杰 at:2015-11-02 17:15:47 */ private void initView() { btnLocationBack = (Button) findViewById(R.id.btn_location_back); btnLocationBack.setOnClickListener(this); btnLocationOk = (Button) findViewById(R.id.btn_location_ok); btnLocationOk.setOnClickListener(this); mapViewLocation = (MapView) findViewById(R.id.mapview_location); lvLocNear = (ListView) findViewById(R.id.lv_location_nearby); nearList = new ArrayList<PoiInfo>(); adapter = new LocNearAddressAdapter(context, nearList, isSelected); lvLocNear.setAdapter(adapter); } ~~~ 2.初始化LocationClient类,该类需要在主线程中声明 ~~~ public LocationClient mLocationClient = null; public BDLocationListener myListener = new MyLocationListener(); public void onCreate() { mLocationClient = new LocationClient(getApplicationContext()); //声明LocationClient类 mLocationClient.registerLocationListener( myListener ); //注册监听函数 } ~~~ 3.配置定位SDK参数 设置定位参数包括:定位模式(高精度定位模式,低功耗定位模式和仅用设备定位模式),返回坐标类型,是否打开GPS,是否返回地址信息、位置语义化信息、POI信息等等。 LocationClientOption类,该类用来设置定位SDK的定位方式 ~~~ private void initLocation(){ LocationClientOption option = new LocationClientOption(); option.setLocationMode(LocationMode.Hight_Accuracy );//可选,默认高精度,设置定位模式,高精度,低功耗,仅设备 option.setCoorType("bd09ll");//可选,默认gcj02,设置返回的定位结果坐标系 int span=1000; option.setScanSpan(span);//可选,默认0,即仅定位一次,设置发起定位请求的间隔需要大于等于1000ms才是有效的 option.setIsNeedAddress(true);//可选,设置是否需要地址信息,默认不需要 option.setOpenGps(true);//可选,默认false,设置是否使用gps option.setLocationNotify(true);//可选,默认false,设置是否当gps有效时按照1S1次频率输出GPS结果 option.setIsNeedLocationDescribe(true);//可选,默认false,设置是否需要位置语义化结果,可以在BDLocation.getLocationDescribe里得到,结果类似于“在北京天安门附近” option.setIsNeedLocationPoiList(true);//可选,默认false,设置是否需要POI结果,可以在BDLocation.getPoiList里得到 option.setIgnoreKillProcess(false);//可选,默认false,定位SDK内部是一个SERVICE,并放到了独立进程,设置是否在stop的时候杀死这个进程,默认杀死 option.SetIgnoreCacheException(false);//可选,默认false,设置是否收集CRASH信息,默认收集 option.setEnableSimulateGps(false);//可选,默认false,设置是否需要过滤gps仿真结果,默认需要 mLocationClient.setLocOption(option); } ~~~ 4.实现BDLocationListener接口 ~~~ /** * 监听函数,有新位置的时候,格式化成字符串,输出到屏幕中 */ public class MyLocationListenner implements BDLocationListener { @Override public void onReceiveLocation(BDLocation location) { if (location == null) { return; } Log.d("map", "On location change received:" + location); Log.d("map", "addr:" + location.getAddrStr()); if (progressDialog != null) { progressDialog.dismiss(); } if (lastLocation != null) { if (lastLocation.getLatitude() == location.getLatitude() && lastLocation.getLongitude() == location.getLongitude()) { Log.d("map", "same location, skip refresh"); // mMapView.refresh(); //need this refresh? return; } } lastLocation = location; mBaiduMap.clear(); mCurrentLantitude = lastLocation.getLatitude(); mCurrentLongitude = lastLocation.getLongitude(); Log.e(">>>>>>>", mCurrentLantitude + "," + mCurrentLongitude); LatLng llA = new LatLng(lastLocation.getLatitude(), lastLocation.getLongitude()); CoordinateConverter converter = new CoordinateConverter(); converter.coord(llA); converter.from(CoordinateConverter.CoordType.COMMON); LatLng convertLatLng = converter.convert(); OverlayOptions ooA = new MarkerOptions().position(convertLatLng).icon(BitmapDescriptorFactory .fromResource(R.drawable.icon_marka)) .zIndex(4).draggable(true); mCurrentMarker = (Marker) mBaiduMap.addOverlay(ooA); MapStatusUpdate u = MapStatusUpdateFactory.newLatLngZoom(convertLatLng, 16.0f); mBaiduMap.animateMapStatus(u); new Thread(new Runnable() { @Override public void run() { searchNeayBy(); } }).start(); } public void onReceivePoi(BDLocation poiLocation) { if (poiLocation == null) { return; } } } ~~~ 这里接受到的BDLocation中包含好多参数,相信总有一个对你有用的。 ### 根据经纬度定位 这种方法不需要自动定位,就是根据经纬度来显示地图上的位置 ~~~ /* * 显示经纬度的位置 * by:hankkin at:2015-05-04 * */ private void showMap(double latitude, double longtitude, String address) { // sendButton.setVisibility(View.GONE); LatLng llA = new LatLng(latitude, longtitude); CoordinateConverter converter = new CoordinateConverter(); converter.coord(llA); converter.from(CoordinateConverter.CoordType.COMMON); LatLng convertLatLng = converter.convert(); OverlayOptions ooA = new MarkerOptions().position(convertLatLng).icon(BitmapDescriptorFactory.fromResource(R.drawable.icon_marka)) .zIndex(4).draggable(true); markerA = (Marker) (mBaiduMap.addOverlay(ooA)); u = MapStatusUpdateFactory.newLatLngZoom(convertLatLng, 16.0f); mBaiduMap.animateMapStatus(u); new Thread(new Runnable() { @Override public void run() { searchNeayBy(); } }).start(); } ~~~ ### 获取周边地理位置 最后看一下怎么获取周边的地理位置,这里需要用到SDK中的一个类PoiNearbySearchOption,我们可以看一下类参考: > PoiNearbySearchOption keyword(java.lang.String key) 检索关键字 PoiNearbySearchOption location(LatLng location) 检索位置 PoiNearbySearchOption pageCapacity(int pageCapacity) 设置每页容量,默认为每页10条 PoiNearbySearchOption pageNum(int pageNum) 分页编号 PoiNearbySearchOption radius(int radius) 设置检索的半径范围 PoiNearbySearchOption sortType(PoiSortType sortType) 搜索结果排序规则,可选,默认 这里是它的一些方法,我们可以看到我们只需要设置一下关键字、周边位置半径、检索位置、排序规则、分页号、每页数量等。然后我们实现OnGetPoiSearchResultListener这个接口,获取周边地理位置结果。 ~~~ /** * 搜索周边地理位置 * by hankkin at:2015-11-01 22:54:49 */ private void searchNeayBy() { PoiNearbySearchOption option = new PoiNearbySearchOption(); option.keyword("写字楼"); option.sortType(PoiSortType.distance_from_near_to_far); option.location(new LatLng(mCurrentLantitude, mCurrentLongitude)); if (radius != 0) { option.radius(radius); } else { option.radius(1000); } option.pageCapacity(20); mPoiSearch.searchNearby(option); } ~~~ ~~~ /** * 接受周边地理位置结果 * by hankkin at:2015-11-02 17:14:54 * * @param poiResult */ @Override public void onGetPoiResult(PoiResult poiResult) { if (poiResult != null) { if (poiResult.getAllPoi()!=null&&poiResult.getAllPoi().size()>0){ nearList.addAll(poiResult.getAllPoi()); if (nearList != null && nearList.size() > 0) { for (int i = 0; i < nearList.size(); i++) { isSelected.put(i, false); } } Message msg = new Message(); msg.what = 0; handler.sendMessage(msg); } } } ~~~ 获取完数据之后更新适配器显示周边位置就OK了,最后再实现一个小小的功能,就是点击列表中的每个位置,显示位置的小图标根据位置的改变而改变 ~~~ /** * 周边地理位置列表点击事件 * by hankkin at:2015-11-02 17:16:29 */ lvLocNear.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) { adapter.setSelected(i); adapter.notifyDataSetChanged(); PoiInfo ad = (PoiInfo) adapter.getItem(i); u = MapStatusUpdateFactory.newLatLng(ad.location); mBaiduMap.animateMapStatus(u); if (!isLoc) { mCurrentMarker.setPosition(ad.location); } else { markerA.setPosition(ad.location); } } }); ~~~ 好了,很简单有用的一个小功能,会给用户带来很好的体验效果。 小编今天就写这么多,以后会更多的给大家分享的。
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Android高仿微信照片选择器+预览+显示照片

最后更新于:2022-04-01 15:54:46

    转载请说明出处: http://blog.csdn.net/lyhhj/article/details/49046109 前阵子写过一片博客,是关于选择多图上传的一个小demo,那个demo是从网上找的然后自己修改了一下,那个demo是仿照QQ的选择照片的形式,那么现在用的比较多的是仿照微信选择照片的形式,所以自己就鼓捣了一个高仿微信照片选择的demo,这里跟大家分享一下,建议大家再看这篇博客之前先看一下我之间的选择多图的那篇博客,那里面的代码讲的比较详细,这篇是在那篇基础之上的: [【Android源码解析】选择多张图片上传多图预览](http://blog.csdn.net/lyhhj/article/details/47731439) 说明一下,这篇博客中的相册选择是参照鸿扬大神的demo写的。 好了下面进入正题,我们先看一下实现效果吧: ![](https://docs.gechiui.com/gc-content/uploads/sites/kancloud/2016-04-18_57144ed636608.jpg) ![](https://docs.gechiui.com/gc-content/uploads/sites/kancloud/2016-04-18_57144ed64cc76.jpg) ![](https://docs.gechiui.com/gc-content/uploads/sites/kancloud/2016-04-18_57144ed66f113.jpg) ![](https://docs.gechiui.com/gc-content/uploads/sites/kancloud/2016-04-18_57144ed6ed4d3.jpg) ![](https://docs.gechiui.com/gc-content/uploads/sites/kancloud/2016-04-18_57144ed739f75.jpg) 下面来介绍一下代码: 之前的代码就不多说了,上面的那篇博客里面有,说一下鸿扬大神的代码吧 基本思路就是: 1.先到手机中扫描jpeg和png的图片 2.获取导图片的路径和图片的父路径名也就是文件夹名 3.将图片路径和文件夹名分别添加导数据源中 4.数据源有了就是显示了,文件夹显示是利用的popwindow,而图片显示则是GridView 看一下具体代码: 首先开启一个线程去扫描图片 ~~~ /** * 利用ContentProvider扫描手机中的图片,此方法在运行在子线程中 完成图片的扫描,最终获得jpg最多的那个文件夹 */ private void getImages() { if (!Environment.getExternalStorageState().equals( Environment.MEDIA_MOUNTED)) { Toast.makeText(this, "暂无外部存储", Toast.LENGTH_SHORT).show(); return; } // 显示进度条 mProgressDialog = ProgressDialog.show(this, null, "正在加载..."); new Thread(new Runnable() { @Override public void run() { String firstImage = null; Uri mImageUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI; ContentResolver mContentResolver = AlbumActivity.this .getContentResolver(); // 只查询jpeg和png的图片 Cursor mCursor = mContentResolver.query(mImageUri, null, MediaStore.Images.Media.MIME_TYPE + "=? or " + MediaStore.Images.Media.MIME_TYPE + "=?", new String[] { "image/jpeg", "image/png" }, MediaStore.Images.Media.DATE_MODIFIED); Log.e("TAG", mCursor.getCount() + ""); while (mCursor.moveToNext()) { // 获取图片的路径 String path = mCursor.getString(mCursor .getColumnIndex(MediaStore.Images.Media.DATA)); Log.e("TAG", path); // 拿到第一张图片的路径 if (firstImage == null) firstImage = path; // 获取该图片的父路径名 File parentFile = new File(path).getParentFile(); if (parentFile == null) continue; String dirPath = parentFile.getAbsolutePath(); ImageFloder imageFloder = null; // 利用一个HashSet防止多次扫描同一个文件夹(不加这个判断,图片多起来还是相当恐怖的~~) if (mDirPaths.contains(dirPath)) { continue; } else { mDirPaths.add(dirPath); // 初始化imageFloder imageFloder = new ImageFloder(); imageFloder.setDir(dirPath); imageFloder.setFirstImagePath(path); } int picSize = parentFile.list(new FilenameFilter() { @Override public boolean accept(File dir, String filename) { if (filename.endsWith(".jpg") || filename.endsWith(".png") || filename.endsWith(".jpeg")) return true; return false; } }).length; totalCount += picSize; imageFloder.setCount(picSize); mImageFloders.add(imageFloder); if (picSize > mPicsSize) { mPicsSize = picSize; mImgDir = parentFile; } } mCursor.close(); // 扫描完成,辅助的HashSet也就可以释放内存了 mDirPaths = null; // 通知Handler扫描图片完成 mHandler.sendEmptyMessage(0x110); } }).start(); } ~~~ 代码很详细不多说 文件夹popwindow弹出事件 ~~~ private void initEvent() { /** * 为底部的布局设置点击事件,弹出popupWindow */ mBottomLy.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { mListImageDirPopupWindow .setAnimationStyle(R.style.anim_popup_dir); mListImageDirPopupWindow.showAsDropDown(mBottomLy, 0, 0); // 设置背景颜色变暗 WindowManager.LayoutParams lp = getWindow().getAttributes(); lp.alpha = .3f; getWindow().setAttributes(lp); } }); } ~~~ 最后是设置图片的点击事件 ~~~ //设置ImageView的点击事件 mImageView.setOnClickListener(new OnClickListener() { //选择,则将图片变暗,反之则反之 @Override public void onClick(View v) { // 已经选择过该图片 if (mSelectedImage.contains(mDirPath + "/" + item)) { mSelectedImage.remove(mDirPath + "/" + item); mSelect.setImageResource(R.drawable.picture_unselected); mImageView.setColorFilter(null); List<ImageBean> delete = new ArrayList<ImageBean>(); for (ImageBean im:Bimp.tempSelectBitmap){ if (im.getPath().equals(mDirPath + "/" + item)){ delete.add(im); } } Bimp.tempSelectBitmap.removeAll(delete); Message msg = new Message(); msg.what=0; AlbumActivity.handler.sendMessage(msg); } else // 未选择该图片 { if (Bimp.tempSelectBitmap.size()>8){ Toast.makeText(context,"超出可选图片数",Toast.LENGTH_SHORT).show(); return; } else { mSelectedImage.add(mDirPath + "/" + item); mSelect.setImageResource(R.drawable.pictures_selected); mImageView.setColorFilter(Color.parseColor("#77000000")); ImageBean imageBean = new ImageBean(); imageBean.setPath(mDirPath + "/" + item); try { imageBean.setBitmap(Bimp.revitionImageSize(mDirPath + "/" + item)); } catch (IOException e) { e.printStackTrace(); } Bimp.tempSelectBitmap.add(imageBean); Message msg = new Message(); msg.what=0; AlbumActivity.handler.sendMessage(msg); } } } ~~~ 这里面为了配合之前的博客,我加入了选中图片和取消选中图片将图片在Bimp.tempSelectBitmap中删除和添加的操作,更新选择图片的数量,也就是下面这两段代码: ~~~ List<ImageBean> delete = new ArrayList<ImageBean>(); for (ImageBean im:Bimp.tempSelectBitmap){ if (im.getPath().equals(mDirPath + "/" + item)){ delete.add(im); } } Bimp.tempSelectBitmap.removeAll(delete); Message msg = new Message(); msg.what=0; AlbumActivity.handler.sendMessage(msg); ~~~ ~~~ ImageBean imageBean = new ImageBean(); imageBean.setPath(mDirPath + "/" + item); try { imageBean.setBitmap(Bimp.revitionImageSize(mDirPath + "/" + item)); } catch (IOException e) { e.printStackTrace(); } Bimp.tempSelectBitmap.add(imageBean); Message msg = new Message(); msg.what=0; AlbumActivity.handler.sendMessage(msg); ~~~ 这里有一点说明,就是我在写移除图片的时候遇到了一个错误,Java ConcurrentModificationException异常,这个错误就是说当我们的Vector,List或者ArrayList中的数据源发生变化的时候,你再去操作这个list就会出现这个异常错误,解决办法是,遍历这个图片数组,比较路径是否相同(最好的办法是比较id是否相同),new 一个数组将相同的图片假如new的数组中,最后用之前的图片数组removeAll来移除,这样就不会报异常错误了,当然我们new的数组肯定比我们之前的数组数据源少或者等同。 好了代码实现就是这些了,至于源码我整理完毕后就会传上来的,想要的小伙伴可以私聊我。 这里还要非常感谢鸿扬大神写了那么多好的博客,让我们学习,这里有不完善的地方还请小伙伴们多多包涵,多多指正。 代码已经同步到我的Github上,小伙伴们关注一下 [https://github.com/Hankkin/WeiXinSelectImgsDemo.git](https://github.com/Hankkin/WeiXinSelectImgsDemo.git) 转载请说明出处:http://blog.csdn.net/lyhhj/article/details/49046109
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Android源码解析-仿今日头条PagerSlidingTabStrip滑动页面导航效果

最后更新于:2022-04-01 15:54:44

最近项目中用到了滑动页面,也就是和目前市场上很火的"今日头条"页面滑动类似,在网上找了一下,大部分都是用ViewPager来实现的,刚开始我用的是ViewPager+ViewGroup,上面的标题按钮用的是HorizontalScrollView,写完之后感觉效果比较生硬,果断换掉,发现了一个效果比较好的第三方,也就是今天的主题:PagerSlidingTabStrip.好了,下面来具体介绍一下PagerSlidingTabStrip,进行一下源码解析. ### 一:到GitHub上去下载源码和Demo GitHub地址: https://github.com/astuetz/PagerSlidingTabStrip 先看一下demo的样子吧 ![](https://docs.gechiui.com/gc-content/uploads/sites/kancloud/2016-04-18_57144ed5d0186.jpg) ![](https://docs.gechiui.com/gc-content/uploads/sites/kancloud/2016-04-18_57144ed600b7e.jpg) ### 二:把PagerSlidingTabStrip导入我们的项目中 然后在我们的布局文件中进行声明: ~~~ <span style="font-size:14px;"><?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res/com.hankkin.PagerSlidingTabStrip" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <com.hankkin.PagerSlidingTabStrip.view.PagerSlidingTabStrip android:id="@+id/tab" app:pstsShouldExpand="false" app:pstsUnderlineHeight="2dp" app:pstsIndicatorHeight="2dp" app:pstsIndicatorColor="@android:color/holo_blue_light" app:selectedTabTextColor="@android:color/holo_blue_light" app:pstsDividerColor="@android:color/transparent" app:pstsTabBackground="@drawable/background" android:background="@android:color/white" android:layout_width="match_parent" android:layout_height="55dp"/> <android.support.v4.view.ViewPager android:id="@+id/pager" android:layout_width="match_parent" android:layout_height="match_parent"/> </LinearLayout></span><span style="font-size:18px;"> </span> ~~~ 上面的也就是我们的标题滑动按钮,下面的ViewPager用来存放我们的内容 ### 三:创建Adapter ~~~ <span style="font-size:14px;">package com.hankkin.PagerSlidingTabStrip.adapter; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentManager; import android.support.v4.app.FragmentPagerAdapter; import com.hankkin.PagerSlidingTabStrip.fragment.AndroidFragment; import com.hankkin.PagerSlidingTabStrip.fragment.JavaFragment; import com.hankkin.PagerSlidingTabStrip.fragment.ObjectCFragment; import java.util.List; /** * Created by Hankkin on 15/9/20. */ public class MyAdapter extends FragmentPagerAdapter { private AndroidFragment androidFragment; private JavaFragment javaFragment; private ObjectCFragment objectCFragment; private String[] titles; public MyAdapter(FragmentManager fm,String[] titles) { super(fm); this.titles = titles; } @Override public Fragment getItem(int position) { switch (position) { case 0: if (androidFragment == null) { androidFragment = new AndroidFragment(); } return androidFragment; case 1: if (javaFragment == null) { javaFragment = new JavaFragment(); } return javaFragment; case 2: if (objectCFragment == null) { objectCFragment = new ObjectCFragment(); } return objectCFragment; default: return null; } } @Override public int getCount() { return titles.length; } public String getPageTitle(int i){ return titles[i]; } } </span> ~~~ 我这里用的是碎片Fragment,最下面的getPageTitle()是我们的PagerSlidingTabStrip中的方法,用来获取标题 接下来我们初始化PagerSlidingTabStrip和ViewPager还有我们的碎片 ~~~ <span style="font-size:14px;"> private void initViews(){ fragments = new ArrayList<>(); pagerTab = (PagerSlidingTabStrip) findViewById(R.id.tab); pager = (ViewPager) findViewById(R.id.pager); for (int i=0;i<titles.length;i++){ Fragment fragment = new Fragment(); fragments.add(fragment); } adapter = new MyAdapter(getSupportFragmentManager(),titles); pager.setAdapter(adapter); pagerTab.setViewPager(pager); }</span> ~~~ 在Adapter中利用碎片管理器获取我们的碎片和标题相对应上.这里面需要注意提一下,如果碎片的个数比较少我们可以手动创建碎片,如果像今日头条很多的话也没关系,动态创建Fragment,因为我们可以看到头条的每个碎片中的内容都是类似的,所以说动态创建也未尝不可,只有个别特殊的我们也可以特殊处理. 就这么简单就可以实现类似头条的页面滑动效果,下面我们来看一下PagerSlidingTabStrip的源码吧,看懂了之后也方便我们进行改进. ### 四:PagerSlidingTabStrip源码解析 首先我们看几个比较重要的属性 ~~~ private int indicatorColor = 0xFF666666;// 滑动指示器颜色 private int underlineColor = 0x1A000000;//在视图的底部的全宽度的线pstsunderlinecolor颜色 private int dividerColor = 0x1A000000;//选项卡之间的分隔pstsdividercolor颜色 private boolean shouldExpand = false;//pstsshouldexpand如果设置为TRUE,每个标签都给予同样的重量,默认为false private boolean textAllCaps = true;//pststextallcaps如果为真,所有选项卡标题都是大写,默认为true private int scrollOffset = 52;//pstsscrolloffset卷轴被选择的标签的偏移 private int indicatorHeight = 8;//滑动指示器pstsindicatorheight private int underlineHeight = 2;//在视图的底部的全宽度的线pstsunderlineheight高度 private int dividerPadding = 12;//pstsdividerpadding顶部和底部填充的分频器 private int tabPadding = 24;//pststabpaddingleftright左、右填充每个选项卡 private int dividerWidth = 1;//选项卡分割线宽度 private int tabTextSize = 12;//选项卡字体大小 private int tabTextColor = 0xFF666666;//选项卡字体颜色 private int selectedTabTextColor = 0xFF666666;//当前选中字体颜色 private Typeface tabTypeface = null; private int tabTypefaceStyle = Typeface.NORMAL; private int lastScrollX = 0; private int tabBackgroundResId = R.drawable.background;//pststabbackground背景绘制的每个标签,应该是一个statelistdrawable ~~~ 我们可以自己定义这些属性的值,因为可能默认的不太好看 1.首先看一下我们的构造会初始化一些什么属性 ~~~ <span style="font-size:14px;">public PagerSlidingTabStrip(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); setFillViewport(true);//默认使子view可以拉伸来填满整个屏幕 setWillNotDraw(false);//默认不执行OnDraw()方法 //初始化盛放按钮标题的线性布局 tabsContainer = new LinearLayout(context); tabsContainer.setOrientation(LinearLayout.HORIZONTAL); tabsContainer.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT)); addView(tabsContainer); DisplayMetrics dm = getResources().getDisplayMetrics(); //导入相应资源文件 scrollOffset = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, scrollOffset, dm); indicatorHeight = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, indicatorHeight, dm); underlineHeight = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, underlineHeight, dm); dividerPadding = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dividerPadding, dm); tabPadding = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, tabPadding, dm); dividerWidth = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dividerWidth, dm); tabTextSize = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, tabTextSize, dm); // get system attrs (android:textSize and android:textColor) TypedArray a = context.obtainStyledAttributes(attrs, ATTRS); tabTextSize = a.getDimensionPixelSize(0, tabTextSize); tabTextColor = a.getColor(1, tabTextColor); a.recycle(); // get custom attrs a = context.obtainStyledAttributes(attrs, R.styleable.PagerSlidingTabStrip); indicatorColor = a.getColor(R.styleable.PagerSlidingTabStrip_pstsIndicatorColor, indicatorColor); //tab文字选中时的颜色,默认和滑动指示器的颜色一致 selectedTabTextColor=a.getColor(R.styleable.PagerSlidingTabStrip_selectedTabTextColor, indicatorColor); //初始化属性样式 underlineColor = a.getColor(R.styleable.PagerSlidingTabStrip_pstsUnderlineColor, underlineColor); dividerColor = a.getColor(R.styleable.PagerSlidingTabStrip_pstsDividerColor, dividerColor); indicatorHeight = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_pstsIndicatorHeight, indicatorHeight); underlineHeight = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_pstsUnderlineHeight, underlineHeight); dividerPadding = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_pstsDividerPadding, dividerPadding); tabPadding = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_pstsTabPaddingLeftRight, tabPadding); tabBackgroundResId = a.getResourceId(R.styleable.PagerSlidingTabStrip_pstsTabBackground, tabBackgroundResId); shouldExpand = a.getBoolean(R.styleable.PagerSlidingTabStrip_pstsShouldExpand, shouldExpand); scrollOffset = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_pstsScrollOffset, scrollOffset); textAllCaps = a.getBoolean(R.styleable.PagerSlidingTabStrip_pstsTextAllCaps, textAllCaps); a.recycle(); rectPaint = new Paint(); rectPaint.setAntiAlias(true); rectPaint.setStyle(Style.FILL); dividerPaint = new Paint(); dividerPaint.setAntiAlias(true); dividerPaint.setStrokeWidth(dividerWidth); defaultTabLayoutParams = new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.MATCH_PARENT); expandedTabLayoutParams = new LinearLayout.LayoutParams(0, LayoutParams.MATCH_PARENT, 1.0f); if (locale == null) { locale = getResources().getConfiguration().locale; } }</span> ~~~ 这些基本都能看懂,主要都是初始化一些属性,代码中也有相应的注释,就不一一介绍了 2.定义ViewPager滑动监听器,设置当前pager的位置 ~~~ <span style="font-size:14px;">private class PageListener implements OnPageChangeListener { @Override public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { currentPosition = position; currentPositionOffset = positionOffset; scrollToChild(position, (int) (positionOffset * tabsContainer.getChildAt(position).getWidth())); invalidate(); if (delegatePageListener != null) { delegatePageListener.onPageScrolled(position, positionOffset, positionOffsetPixels); } } @Override public void onPageScrollStateChanged(int state) { if (state == ViewPager.SCROLL_STATE_IDLE) { scrollToChild(pager.getCurrentItem(), 0); } if (delegatePageListener != null) { delegatePageListener.onPageScrollStateChanged(state); } } @Override public void onPageSelected(int position) { selectedPosition = position; updateTabStyles(); if (delegatePageListener != null) { delegatePageListener.onPageSelected(position); } } }</span> ~~~ 3.更新标题样式,也就是滑动到当前标题下设置标题状态 ~~~ <span style="font-size:14px;">private void updateTabStyles() { for (int i = 0; i < tabCount; i++) { View v = tabsContainer.getChildAt(i); v.setBackgroundResource(tabBackgroundResId); if (v instanceof TextView) { TextView tab = (TextView) v; tab.setTextSize(TypedValue.COMPLEX_UNIT_PX, tabTextSize); tab.setTypeface(tabTypeface, tabTypefaceStyle); tab.setTextColor(tabTextColor); // setAllCaps() is only available from API 14, so the upper case is made manually if we are on a // pre-ICS-build if (textAllCaps) { if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) { tab.setAllCaps(true); } else { tab.setText(tab.getText().toString().toUpperCase(locale)); } } if (i == selectedPosition) { tab.setTextColor(selectedTabTextColor); } } } }</span> ~~~ 大体就差不多这些了,好了,给大家看一下我自己完善后的样子吧 ![](https://docs.gechiui.com/gc-content/uploads/sites/kancloud/2016-04-18_57144ed61cd13.jpg) 没有做太多调整,只是稍微的改了一下样式,里面还有一些比较细节的东西没有介绍,比如标题的宽度是平均分配还是分体字体长度进行设置,我们可以修改shouldExpand属性 大家有兴趣的自己仔细研究一下吧.
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最后更新于:2022-04-01 15:54:42

> 原文出处:[Android 高仿篇](http://blog.csdn.net/column/details/hankkin-imitation.html) 作者:[lyhhj](http://blog.csdn.net/lyhhj) **本系列文章经作者授权在看云整理发布,未经作者允许,请勿转载!** # Android 高仿篇 > 高仿热门App中的各种功能模块
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