问当用户在inageviewer应用程序中按下图片3-5秒时，如何显示“设置为墙纸”的弹出选项？

EN

findViewById("your wall paper image id").onTouchListener(new MyOnTouchListener());



class MyOnTouchListener implements onTouchListener{
    GestureDetector gd = new GestureDetector(new SimpleOnGestureListener(){
        @Override
        public void onLongPress(MotionEvent e) {

            AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(
                    context);

            alertDialogBuilder.setTitle("Your Title");

            alertDialogBuilder
            .setMessage("click yes to set wallpaper!")
            .setCancelable(false)
            .setPositiveButton("Yes",new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog,int id) {
                    //setting wallpaper
                }
            })
            .setNegativeButton("No",new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog,int id) {
                    dialog.cancel();
                }
            });

            // create alert dialog
            AlertDialog alertDialog = alertDialogBuilder.create();

            // show it
            alertDialog.show();
        }
    });
}