popwindow和spinner的用法

在popwindow里加上spinner会报错，E/AndroidRuntime(6943): android.view.WindowManager$BadTokenException: Unable to add window -- token android.view.ViewRootImpl$W@4670d3b8 is not valid; is your activity running? 原因是当你点击spinner的时候，弹出的窗口找不到它的依附的点，也就是找不到当前activity的上下文，所以会报错。解决方法有多种如下

1,最简便的改进方法就是更改spinner弹出窗口的mode,在xml中设置spinner的spinnerMode为dialog即可，虽然样式很原始，但是是可以解决崩溃的问题的。

private void showPopupWindow() {
    //设置contentView
    View contentView = LayoutInflater.from(MainActivity.this).inflate(R.layout.popupwindow, null);
    Button mPopbtn = (Button) contentView.findViewById(R.id.button);
    Spinner mPopSpinner = (Spinner) contentView.findViewById(R.id.spinner);
    //数据
    ArrayList data_list = new ArrayList();
    data_list.add("一般报警");
    data_list.add("图片报警");
    data_list.add("视频包括");
    data_list.add("设备报警");

    //适配器
    ArrayAdapter arr_adapter = new ArrayAdapter(this, android.R.layout.simple_spinner_item, data_list);
    //设置样式
    //arr_adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    //加载适配器
    mPopSpinner.setAdapter(arr_adapter);
    mPopbtn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            startActivity(new Intent(getApplication(),MainActivity.class));
        }
    });


    mPopWindow = new PopupWindow(contentView,
            FrameLayout.LayoutParams.MATCH_PARENT, FrameLayout.LayoutParams.WRAP_CONTENT, true);
    mPopWindow.setContentView(contentView)   ;
    //显示PopupWindow
  //  main.setVisibility(View.INVISIBLE);
    View rootview = LayoutInflater.from(MainActivity.this).inflate(R.layout.activity_main, null);
    mPopWindow.showAtLocation(rootview, Gravity.CENTER,0 , 0);
    // 点击其他地方消失
    contentView.setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {

            if (mPopWindow != null && mPopWindow.isShowing()) {
                mPopWindow.dismiss();
                mPopWindow = null;
            }
            return false;
        }
    });
}

布局文件设置模式就好了如图

<Spinner
    android:id="@+id/spinner"
    android:layout_width="match_parent"
    android:spinnerMode="dialog"
    android:layout_height="60dp"
    android:layout_gravity="center"
    android:layout_marginTop="50dp">Spinner>

2.可以用popwindowl来的代替spinner，showasdropdown（）,


    
    
    
    
ublic  class  PopWindowSpinnerActivity  extends  Activity {



    //下拉按钮

    TextView MyButton;

    //PopupWindow对象声明

    PopupWindow pw;



    ArrayList list;

    //当前选中的列表项位置

    int  clickPsition = - 1 ;



    @Override

    public  void  onCreate(Bundle savedInstanceState) {



        super .onCreate(savedInstanceState);



        setContentView(R.layout.activity_pop_window);



        MyButton = (TextView) findViewById(R.id.myButton);

        //获得要显示的数据

        list = getList();

        //设置默认显示的Text

        MyButton.setText(list.get( 0 ));



        MyButton.setOnClickListener( new  View.OnClickListener() {



            @Override

            public  void  onClick(View v) {

                //通过布局注入器，注入布局给View对象

                View myView = getLayoutInflater().inflate(R.layout.pop,  null );

                //通过view 和宽·高，构造PopopWindow

                pw =  new  PopupWindow(myView,  240 ,  300 ,  true );



                pw.setBackgroundDrawable(getResources().getDrawable(

                        //此处为popwindow 设置背景，同事做到点击外部区域，popwindow消失

                        R.drawable.diaolog_bg));

                //设置焦点为可点击

                pw.setFocusable( true ); //可以试试设为false的结果

                //将window视图显示在myButton下面

                pw.showAsDropDown(MyButton);



                ListView lv = (ListView) myView.findViewById(R.id.lv_pop);

                lv.setAdapter( new  ListViewAdapter(PopWindowSpinnerActivity. this , list));

                lv.setOnItemClickListener( new  AdapterView.OnItemClickListener() {



                    @Override

                    public  void  onItemClick(AdapterView parent, View view,

                            int  position,  long  id) {

                        MyButton.setText(list.get(position));

                        if  (clickPsition != position) {

                            clickPsition = position;

                        }

                        pw.dismiss();

                    }

                });

            }



        });



    }



    /**

     * 得到list集合的方法

     * @return

     */

    public  ArrayList getList() {

        ArrayList list =  new  ArrayList();


    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    list.add("一般报警");
    list.add("图片报警");
    list.add("视频包括");
    list.add("设备报警")
    
    
    
    
        return  list;



    }



}