PopupWindow 实现 查看所有手机应用弹出框

public class MainActivity extends Activity implements OnItemLongClickListener, OnClickListener {

    private ListView lv_main;
    private List<AppInfo> data;
    private AppAdapter adapter;

    private PopupWindow pw;
    private View pwView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        //初始化成员变量
        lv_main = (ListView) findViewById(R.id.lv_main);
        data = getAllAppInfos();
        adapter = new AppAdapter();
        //显示列表
        lv_main.setAdapter(adapter);

        //给ListView设置item的点击监听
        lv_main.setOnItemClickListener(new OnItemClickListener() {
            /**
             * parent : ListView
             * view : 当前行的item视图对象
             * position : 当前行的下标
             */
            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {
                //提示当前行的应用名称
                String appName = data.get(position).getAppName();
                //提示
                //Toast.makeText(MainActivity.this, appName, 0).show();

                if(pw==null) {
                    pwView = View.inflate(MainActivity.this, R.layout.pw_layout, null);
                    //得到子view设置点击监听
                    pwView.findViewById(R.id.ll_pw_uninstall).setOnClickListener(MainActivity.this);
                    pwView.findViewById(R.id.ll_pw_run).setOnClickListener(MainActivity.this);
                    pwView.findViewById(R.id.ll_pw_share).setOnClickListener(MainActivity.this);

                    pw = new PopupWindow(pwView, view.getWidth()-80, view.getHeight());
                    pw.setBackgroundDrawable(new BitmapDrawable());//必须指定一个背景图片，随便一个即可，不然以下设置的动画不显示
                }

                //如果正在显示, 移除
                if(pw.isShowing()) {
                    pw.dismiss();//只是不显示了, 但对象仍然在内存中
                }

                //(再)显示
                pw.showAsDropDown(view, 40, -view.getHeight());

                //缩放动画
                ScaleAnimation animation = new ScaleAnimation(0, 1, 0, 1);
                animation.setDuration(1000);
                //启动动画
                pwView.startAnimation(animation);
            }
        });

        //给LitView设置Item的长按监听
        lv_main.setOnItemLongClickListener(this);
        //设置listView的滚动监听
        lv_main.setOnScrollListener(new OnScrollListener() {

            /*
             * SCROLL_STATE_IDLE : 空闲(不动)
             * SCROLL_STATE_TOUCH_SCROLL : 跟着手指滚动
             * SCROLL_STATE_FLING : 快速滚动
             */
            //当listView的滚动状态发生改变时调用
            @Override
            public void onScrollStateChanged(AbsListView view, int scrollState) {
                Log.e("TAG", "onScrollStateChanged()..."+scrollState);
                if(scrollState==OnScrollListener.SCROLL_STATE_TOUCH_SCROLL) {
                    //移除正在显示的pw
                    if(pw!=null && pw.isShowing()) {
                        pw.dismiss();
                    }
                }
            }

            //当listView正在滚动时调用(产生move时不断调用)
            @Override
            public void onScroll(AbsListView view, int firstVisibleItemPosition,
                    int visibleItemCount, int totalItemCount) {
                Log.e("TAG", "onScroll()...");
            }
        });
    }

    class  AppAdapter extends BaseAdapter {

        @Override
        public int getCount() {
            return data.size();
        }

        @Override
        public Object getItem(int position) {
            return data.get(position);
        }

        @Override
        public long getItemId(int position) {
            // TODO Auto-generated method stub
            return 0;
        }

        //返回带数据当前行的Item视图对象
        @Override
        public View getView(int position, View convertView, ViewGroup parent) {

            //1. 如果convertView是null, 加载item的布局文件
            if(convertView==null) {
                Log.e("TAG", "getView() load layout");
                convertView = View.inflate(MainActivity.this, R.layout.item_main, null);

            }
            //2. 得到当前行数据对象
            AppInfo appInfo = data.get(position);
            //3. 得到当前行需要更新的子View对象
            ImageView imageView = (ImageView) convertView.findViewById(R.id.iv_item_icon);
            TextView textView = (TextView) convertView.findViewById(R.id.tv_item_name);
            //4. 给视图设置数据
            imageView.setImageDrawable(appInfo.getIcon());
            textView.setText(appInfo.getAppName());

            //返回convertView
            return convertView;
        }

    }

    /*
     * 得到手机中所有应用信息的列表
     * AppInfo
     *  Drawable icon  图片对象
     *  String appName
     *  String packageName
     */
    protected List<AppInfo> getAllAppInfos() {

        List<AppInfo> list = new ArrayList<AppInfo>();
        // 得到应用的packgeManager
        PackageManager packageManager = getPackageManager();
        // 创建一个主界面的intent
        Intent intent = new Intent();
        intent.setAction(Intent.ACTION_MAIN);
        intent.addCategory(Intent.CATEGORY_LAUNCHER);
        // 得到包含应用信息的列表
        List<ResolveInfo> ResolveInfos = packageManager.queryIntentActivities(
                intent, 0);
        // 遍历
        for (ResolveInfo ri : ResolveInfos) {
            // 得到包名
            String packageName = ri.activityInfo.packageName;
            // 得到图标
            Drawable icon = ri.loadIcon(packageManager);
            // 得到应用名称
            String appName = ri.loadLabel(packageManager).toString();
            // 封装应用信息对象
            AppInfo appInfo = new AppInfo(icon, appName, packageName);
            // 添加到list
            list.add(appInfo);
        }
        return list;
    }

    @Override
    public boolean onItemLongClick(AdapterView<?> parent, View view,
            int position, long id) {
        //删除当前行
            //删除当前行的数据
        data.remove(position);
            //更新列表
        //lv_main.setAdapter(adapter);//显示列表, 不会使用缓存的item的视图对象
        adapter.notifyDataSetChanged();//通知更新列表, 使用所有缓存的item的视图对象

        return true;
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
        case R.id.ll_pw_uninstall:
            pw.dismiss();
            Toast.makeText(this, "卸载", 0).show();
            break;
        case R.id.ll_pw_run:
            pw.dismiss();
            Toast.makeText(this, "运行", 0).show();
            break;
        case R.id.ll_pw_share:
            pw.dismiss();
            Toast.makeText(this, "分享", 0).show();
            break;

        default:
            break;
        }
    }
}

item_bg_selector
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" >

    <item android:state_pressed="true">
        <shape>
            <solid android:color="#00ffff"></solid>
        </shape>
    </item>

</selector>

pw_layout

<?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="80dp"
    android:background="@drawable/local_popup_bg"
    android:orientation="horizontal"
    android:paddingLeft="20dp" >

    <LinearLayout
        android:id="@+id/ll_pw_uninstall"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:gravity="center"
        android:orientation="vertical"
        android:background="@drawable/item_bg_selector" >

        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/img1" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="卸载"
            android:textSize="16sp" />
    </LinearLayout>

    <View
        android:layout_width="1dp"
        android:layout_height="fill_parent"
        android:background="#00ff00" />

    <LinearLayout
        android:id="@+id/ll_pw_run"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:gravity="center"
        android:orientation="vertical"
        android:background="@drawable/item_bg_selector" >

        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/img2" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="运行"
            android:textSize="16sp" />
    </LinearLayout>

    <View
        android:layout_width="1dp"
        android:layout_height="fill_parent"
        android:background="#00ff00" />

    <LinearLayout
        android:id="@+id/ll_pw_share"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:gravity="center"
        android:orientation="vertical"
        android:background="@drawable/item_bg_selector">

        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/img3" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="分享"
            android:textSize="16sp" />
    </LinearLayout>

</LinearLayout>