(三)——自定义不一样的Toast

最后更新于:2022-04-01 09:36:12

# Android特效专辑(三)——自定义不一样的Toast ~~~ 大家都知道,Android的控件有时候很难满足我们的需求,所以我们需要自定义View。自定义的方式很多,有继承原生控件也有直接自定义View的,今天写的是自定义的Toast,当然,这个不是复写Toast,是换一种表达形式,哈哈,后续会增加自定义View的方方面面 ~~~ > 这里啰嗦几句,我看到网上很多教程写的很不详细,就像是直接CV过来的一样,所以有时间我就会把我需要的东西写起来,然后尽可能的描述的清楚一点,以后我工作用到了就可以直接拿来用了,同时也可以把有用的星系分享给大家,这就是我写博客 的初衷了,经常去墙外面找的好例子,我也是摸透了才放在我博客上,如果以后有疑问或者不懂的,可以加我QQ沟通 ~~~ 先来看看效果图吧 ~~~ ![这里写图片描述](https://docs.gechiui.com/gc-content/uploads/sites/kancloud/2016-02-24_56cd2c1718703.jpg "") ~~~ 是不是挺好看的,如果你看过Toast的源码就会知道,他主要是用了WindowManager,我们也直接来写一个 ~~~ ### TabToast ~~~ package com.lgl.toast; import android.content.Context; import android.text.TextUtils; import android.util.DisplayMetrics; import android.view.Gravity; import android.view.View; import android.view.ViewGroup; import android.view.WindowManager; import android.widget.LinearLayout; import android.widget.TextView; import android.widget.Toast; public class TabToast { /** * Toast字体大小 */ private static final float DEFAULT_TEXT_SIZE = 14; /** * Toast字体颜色 */ private static final int DEFAULT_TEXT_COLOR = 0xffffffff; /** * Toast背景颜色 */ private static final int DEFAULT_BG_COLOR = 0xE6f5695a; /** * Toast的高度(单位dp) */ private static final float DEFAULT_TOAST_HEIGHT = 50.0f; private static Context mContext; private volatile static TabToast mInstance; private static Toast mToast; private View layout; private TextView tv; public TabToast(Context context) { mContext = context; } /** * 单例模式 * * @param context * 传入的上下文 * @return TabToast实例 */ private static TabToast getInstance(Context context) { if (mInstance == null) { synchronized (TabToast.class) { if (mInstance == null) { mInstance = new TabToast(context.getApplicationContext()); } } } return mInstance; } private static void getToast(int duration) { //设置位置int gravity, int xOffset, int yOffset if (mToast == null) { mToast = new Toast(mContext); mToast.setGravity(Gravity.BOTTOM, 0, 0); //设置显示时间 mToast.setDuration(duration == Toast.LENGTH_LONG ? Toast.LENGTH_LONG : Toast.LENGTH_SHORT); } } public static void makeText(Context context, String text) { makeText(context, text, Toast.LENGTH_SHORT); } public static void makeText(Context context, String text, int duration) { getInstance(context); getToast(duration); if (mInstance.layout == null || mInstance.tv == null) { LinearLayout container = new LinearLayout(mContext); LinearLayout.LayoutParams rootParams = new LinearLayout.LayoutParams( LinearLayout.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT); container.setLayoutParams(rootParams); container.setBackgroundColor(DEFAULT_BG_COLOR); container.setGravity(Gravity.CENTER); mInstance.tv = new TextView(mContext); LinearLayout.LayoutParams tvParams = new LinearLayout.LayoutParams( getScreenWidth(mContext), dp2px(DEFAULT_TOAST_HEIGHT)); mInstance.tv.setLayoutParams(tvParams); mInstance.tv.setPadding(dp2px(5), dp2px(2), dp2px(5), dp2px(2)); mInstance.tv.setGravity(Gravity.CENTER); mInstance.tv.setTextColor(DEFAULT_TEXT_COLOR); mInstance.tv.setMaxLines(2); mInstance.tv.setEllipsize(TextUtils.TruncateAt.END); mInstance.tv.setBackgroundColor(DEFAULT_BG_COLOR); mInstance.tv.setTextSize(DEFAULT_TEXT_SIZE); container.addView(mInstance.tv); mInstance.layout = container; mToast.setView(mInstance.layout); } mInstance.tv.setText(text); mToast.show(); } /** * dp转px * * @param value * dp * @return px */ public static int dp2px(float value) { float scale = mContext.getResources().getDisplayMetrics().density; return (int) (value * scale + 0.5f); } /** * 获得屏幕宽度 * * @param context * Context * @return px */ public static int getScreenWidth(Context context) { WindowManager wm = (WindowManager) context .getSystemService(Context.WINDOW_SERVICE); DisplayMetrics outMetrics = new DisplayMetrics(); wm.getDefaultDisplay().getMetrics(outMetrics); float density = outMetrics.density; return (int) (outMetrics.widthPixels * density); } } ~~~ ~~~ 然后直接调用就可以了 ~~~ ~~~ TabToast.makeText(MainActivity.this, "自定义Toast"); ~~~ ### Demo下载地址:[http://download.csdn.net/detail/qq_26787115/9391760](http://download.csdn.net/detail/qq_26787115/9391760)
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