android中popwindow的使用

android开发中popwindow的使用，首先需要定义popwindow的布局，这里定义的比较简单

pop_item.xml

<?xml version="1.0" encoding="utf-8"?>  <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"      android:layout_width="match_parent"      android:layout_height="match_parent"      android:orientation="vertical"      android:background="#ff0000" >        <Button          android:id="@+id/ok"          android:layout_width="wrap_content"          android:layout_height="wrap_content"          android:text="确定" />        <Button          android:id="@+id/cancle"          android:layout_width="wrap_content"          android:layout_height="wrap_content"          android:text="取消" />     </LinearLayout>

在MainActivity中获得自定义的popWindow布局，实例化popwindow对象，然后定义其显示位置，显示动画等

MainActivity.java

package com.example.popwindow;    import android.os.Bundle;  import android.app.Activity;  import android.view.Gravity;  import android.view.LayoutInflater;  import android.view.Menu;  import android.view.View;  import android.view.View.OnClickListener;  import android.widget.Button;  import android.widget.PopupWindow;  import android.widget.Toast;    public class MainActivity extends Activity {     @Override   protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    Button open = (Button) findViewById(R.id.open);    open.setOnClickListener(new OnClickListener() {          @Override     public void onClick(View arg0) {      // TODO Auto-generated method stub      View view = LayoutInflater.from(MainActivity.this).inflate(R.layout.pop_item,null);      Button ok = (Button) view.findViewById(R.id.ok);      Button cancle = (Button) view.findViewById(R.id.cancle);            final PopupWindow popWindow = new PopupWindow(view, 100,100);      popWindow.setAnimationStyle(R.anim.pop);      popWindow.showAsDropDown(arg0);      ok.setOnClickListener(new OnClickListener() {              @Override       public void onClick(View arg0) {        // TODO Auto-generated method stub        Toast.makeText(MainActivity.this,"you click ok",1000).show();       }      });      cancle.setOnClickListener(new OnClickListener() {              @Override       public void onClick(View arg0) {        // TODO Auto-generated method stub        popWindow.dismiss();       }      });     }    });       }    }

pop.xml

<?xml version="1.0" encoding="utf-8"?>  <set xmlns:android="http://schemas.android.com/apk/res/android">      <alpha android:fromAlpha="0"             android:toAlpha="1"             android:duration="2000">      </alpha>  </set>

来自： http://blog.csdn.net//mockingbirds/article/details/40260437