android SDK开发 — TitleBar封装(二)
最后更新于：2022-04-01 10:05:59
android SDK开发 -- TitleBar封装 (一) [点击打开链接](http://blog.csdn.net/id19870510/article/details/50386067)
这一篇讲述一下TitleBar怎么增加交互
BaseActivity 中的逻辑实现
~~~
private ViewSwitcher[] titleSwitcher;
/**
* 初始化View
*/
protected void findViewById() {
titleSwitcher = new ViewSwitcher[3];
titleSwitcher[0] = (ViewSwitcher) findViewById(R.id.app_title_left_switcher);
titleSwitcher[1] = (ViewSwitcher) findViewById(R.id.app_title_middle_switcher);
titleSwitcher[2] = (ViewSwitcher) findViewById(R.id.app_title_right_switcher);
}
protected void setTitle(TitleRes leftTitle, TitleRes middleTitle, TitleRes rightTitle) {
TitleRes[] reses = new TitleRes[] { leftTitle, middleTitle, rightTitle };
for (int i = 0; i < reses.length; i++) {
TitleRes res = reses[i];
ViewSwitcher switcher = titleSwitcher[i];
if (res == null) {
switcher.setVisibility(View.INVISIBLE);
} else {
switcher.setVisibility(View.VISIBLE);
// 触发单击事件的View
View clickView = null;
// 文字
if (res.getType() == 0) {
switcher.setDisplayedChild(0);// 显示TextView
//
Object resource = res.getResource();
String title = resource instanceof Integer ? getResources().getString((Integer) resource) : String.valueOf(resource);
((TextView) switcher.getChildAt(0)).setText(title);
clickView = switcher.getChildAt(0);
} else {
switcher.setDisplayedChild(1);// 显示ImageView
//
int imageResource = (Integer) res.getResource();
((ImageView) switcher.getChildAt(1)).setImageResource(imageResource);
clickView = switcher.getChildAt(1);
}
// 设置title的单击事件
clickView.setOnClickListener(res.getClickListener());
}
}
}
~~~
自雷TitleSampleActivity 调用如下
~~~
@Override
protected void findViewById() {
setContentView(R.layout.title_demo);
super.findViewById();
// setTitle("返回主页", "这是一个Title", "下一个界面");
TitleRes left = new TitleRes("left", new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(TitleDemoActivity.this, "click left", Toast.LENGTH_SHORT).show();
//showToast("click left");
}
});
TitleRes middle = new TitleRes("middle", new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(TitleDemoActivity.this, "click middle", Toast.LENGTH_SHORT).show();
//showToast("click middle");
}
});
TitleRes right = new TitleRes("right", new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(TitleDemoActivity.this, "click right", Toast.LENGTH_SHORT).show();
//showToast("click right");
}
});
//
setTitle(left, middle, right);
}
~~~
这个时候title三个控件都具备了交互的能力
Toast.makeText(TitleDemoActivity.this,"click right",Toast.* LENGTH_SHORT * ).show();
程序中会频繁的用到 context Toast等对象
采用Class.this的方式在代码移植、维护、重构等方面很不友好
另外频繁调用Toast每次都那么写的话 麻烦死
所以BaseActivity中新增俩方法
作用于暂且定义为protected 以后估计还得改
~~~
protected Context getContext() {
returnthis;
}
~~~
~~~
protectedvoid showToast(String message) {
Toast.*makeText*(getContext(), message,Toast.*LENGTH_SHORT*).show();
}
~~~
这个时候子类调用父类的代码如下
~~~
TitleRes left =newTitleRes("left",newView.OnClickListener() {
@Override
publicvoid onClick(View v) {
showToast("click left");//
}
});
。。。。中、右略
//
setTitle(left,middle, right);
~~~