PopupWindow

package com.yztc_popupwindow;

import android.app.ActionBar.LayoutParams;
import android.app.Activity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageView;
import android.widget.PopupWindow;
import android.widget.Toast;

/**
* 演示PopupWindow
*/

public class PopupWindowActivity extends Activity implements OnClickListener{private View contentView;private PopupWindow mWindow;private ImageView ivBack, ivCollect, ivShare;@Overrideprotected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    // 创建PopupWimdow    initPopupWindow();    // 三个按钮点击事件    initView();}private void initView() {    ivBack = (ImageView) contentView.findViewById(R.id.iv_back);    ivCollect = (ImageView) contentView.findViewById(R.id.iv_collect);    ivShare = (ImageView) contentView.findViewById(R.id.iv_share);    ivBack.setOnClickListener(this);    ivCollect.setOnClickListener(this);    ivShare.setOnClickListener(this);}private void initPopupWindow() {    // contentView:内容视图    contentView = getLayoutInflater()            .inflate(R.layout.content_layout, null);    mWindow = new PopupWindow(contentView, LayoutParams.MATCH_PARENT,            LayoutParams.WRAP_CONTENT);// 内容，宽，高    // 设置触摸PopupWindow外面的区域时，是否可以使这个PopupWindow消失    mWindow.setOutsideTouchable(true);    // 设置背景    // mWindow.setBackgroundDrawable(background);    // 设置PopupWindow是否触摸时会有响应    // mWindow.setTouchable(true);}// 处理某个按键的方法@Overridepublic boolean onKeyDown(int keyCode, KeyEvent event) {    switch (keyCode) {    case KeyEvent.KEYCODE_MENU:// 监听menu键        // isShowing():判断PopupWindow是否正在展示        if (mWindow.isShowing()) {            mWindow.dismiss();// 消失        } else {            // 显示PopupWindow            mWindow.showAtLocation(contentView, Gravity.BOTTOM, 0, 0);            // 作为下拉视图显示            // mWindow.showAsDropDown(anchor, xoff, yoff);        }        break;    case KeyEvent.KEYCODE_BACK:// 监听返回键        if (mWindow.isShowing()) {            mWindow.dismiss();        }        break;    }    return super.onKeyDown(keyCode, event);}@Overridepublic void onClick(View v) {    switch (v.getId()) {    case R.id.iv_back:        finish();        if (mWindow.isShowing()) {            mWindow.dismiss();        }        break;    case R.id.iv_collect:        Toast.makeText(this, "收藏", Toast.LENGTH_SHORT).show();        break;    case R.id.iv_share:        Toast.makeText(this, "分享", Toast.LENGTH_SHORT).show();        break;    }}@Overrideprotected void onDestroy() {    // TODO Auto-generated method stub    super.onDestroy();    if (mWindow != null) {        mWindow.dismiss();        mWindow = null;        }    }}

PopupWindow布局

<?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="horizontal" ><ImageView    android:id="@+id/iv_back"    android:layout_width="0dp"    android:layout_height="50dp"    android:layout_weight="1"    android:scaleType="fitXY"    android:src="@drawable/ic_launcher" /><ImageView    android:id="@+id/iv_collect"    android:layout_width="0dp"    android:layout_height="50dp"    android:layout_weight="1"    android:scaleType="fitXY"    android:src="@drawable/ic_launcher" /><ImageView    android:id="@+id/iv_share"    android:layout_width="0dp"    android:layout_height="50dp"    android:layout_weight="1"    android:scaleType="fitXY"    android:src="@drawable/ic_launcher" /></LinearLayout>