android--------Popupwindow的使用

PopupWindow在Android.widget包下，项目中经常会使用到PopupWindow做菜单选项，  PopupWindow这个类用来实现一个弹出框，可以使用任意布局的View作为其内容，这个弹出框是悬浮在当前activity之上的。

效果图：

MainActivity.java

 public class MainActivity extends Activityimplements OnClickListener {
 
          private PopupWindowm PopWindow;
          private View parentView;
          private Context context;
          ImageView mImageViewBar;
 
          @Override
          protected void onCreate(Bundle savedInstanceState) {
                    super.onCreate(savedInstanceState);
                    requestWindowFeature(Window.FEATURE_NO_TITLE);
                    setContentView(R.layout.activity_main);
                    context = this;
                    initView();
       }
 
       private void initView() {
         // TODOAuto-generated method stub
           parentView =getLayoutInflater().inflate(R.layout.activity_main,null);
           mImageViewBar =(ImageView) findViewById(R.id.menu);
           mImageViewBar.setOnClickListener(this);
           showPopupWindow();
      }
 
       private void showPopupWindow() {
            LayoutInflater inflater = (LayoutInflater)context
             .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
           View contentView =inflater.inflate(R.layout.popuplayout,null);
           mPopWindow = newPopupWindow(contentView);
           mPopWindow.setWidth(ViewGroup.LayoutParams.WRAP_CONTENT);
           mPopWindow.setHeight(ViewGroup.LayoutParams.WRAP_CONTENT);
           mPopWindow = newPopupWindow();
           // 设置SelectPicPopupWindow的View
           mPopWindow.setContentView(contentView);
           // 设置SelectPicPopupWindow弹出窗体的宽
           mPopWindow.setWidth(LayoutParams.WRAP_CONTENT);
           // 设置SelectPicPopupWindow弹出窗体的高
           mPopWindow.setHeight(LayoutParams.WRAP_CONTENT);
           // 设置SelectPicPopupWindow弹出窗体可点击
          mPopWindow.setFocusable(true);
          mPopWindow.setOutsideTouchable(true);
          // 刷新状态
          mPopWindow.update();
          // 实例化一个ColorDrawable颜色为半透明
          ColorDrawable dw = new ColorDrawable(0000000000);
          // 点back键和其他地方使其消失,设置了这个才能触发OnDismisslistener，设置其他控件变化等操作
          mPopWindow.setBackgroundDrawable(dw);
          contentView.findViewById(R.id.memu1).setOnClickListener(this);
          contentView.findViewById(R.id.memu2).setOnClickListener(this);
          contentView.findViewById(R.id.memu3).setOnClickListener(this);
       }
 
        @Override
       public void onClick(View v) {
          int id =v.getId();
          switch (id) {
            case R.id.menu:
                  mPopWindow.showAsDropDown(mImageViewBar);
                  break;
            case R.id.memu1: {
                  Toast.makeText(context,"消息", Toast.LENGTH_SHORT).show();
                  mPopWindow.dismiss();
                }
                 break;
            case R.id.memu2: {
                 Toast.makeText(context,"收藏", Toast.LENGTH_SHORT).show();
                 mPopWindow.dismiss();
               }
                break;
            case R.id.memu3: {
                 Toast.makeText(context,"首页", Toast.LENGTH_SHORT).show();
                 mPopWindow.dismiss();
               }
                break;
              }
       }
 
       @Override
        protected void onDestroy() {
            // TODOAuto-generated method stub
             super.onDestroy();
            mPopWindow.dismiss();
      }
   }

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