ListPopupWindow使用完整示例(一)——系统自带ListPopupWindow

MainActivity如下:

package cc.wy;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListPopupWindow;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;
/**
 * Demo描述:
 * ListPopupWindow使用完整示例(一)——系统自带ListPopupWindow
 * 
 * 参考资料:
 * 1 http://blog.csdn.net/rambomatrix/article/details/23525379
 * 2 http://blog.csdn.net/jsnrwzm/article/details/14408835
 *   Thank you very much
 *   
 * 注意事项:
 * 1 ListPopupWindow显示item的布局xml文件的写法
 * 2 注意给ListPopupWindow设置anchor.即设置它依附于哪个控件显示
 *   
 */
public class MainActivity extends Activity {
private Context mContext;
private Button mButton;
private ListPopupWindow mListPopupWindow;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        init();
    }

    private void init(){
    mContext=this;
    final String itmes[]={"第一个子项","第二个子项","第三个子项"};
    mListPopupWindow=new ListPopupWindow(mContext);
    mListPopupWindow.setAdapter(new ArrayAdapter<String>(mContext,R.layout.item, itmes));
    mListPopupWindow.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int position,long arg3) {
Toast.makeText(mContext, "点击了"+itmes[position], Toast.LENGTH_SHORT).show();
}
});
    mButton=(Button) findViewById(R.id.button);
    mButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
//指定anchor
mListPopupWindow.setAnchorView(v);
mListPopupWindow.show();
}
});
    }
}

main.xml如下:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">

    <Button
        android:id="@+id/button"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:text="点击弹出系统ListPopupWindow" />

</RelativeLayout>

item.xml如下:

<?xml version="1.0" encoding="utf-8"?>
<TextView 
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/btn"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
  />