自定义退出对话框

 private void showTipe(){
        Dialog dialog;
        dialog = new AlertDialog.Builder(this).create();
        dialog.show();
        View view =getView(R.layout.show_dialog_view);
        Window window =dialog.getWindow();
        window.setContentView(view);
        Button btnYes =(Button) window.findViewById(R.id.btYes);
        Button btnNo=(Button) window.findViewById(R.id.btNo);
    }
   
    private View getView(int id){
        LayoutInflater layout =LayoutInflater.from(this);
        View view =layout.inflate(id, null);
        return view;
       
    }

2.连续点击两次退出程序的方法

@Override
 public boolean onKeyDown(int keyCode, KeyEvent event) {
  if (event.getKeyCode() == event.KEYCODE_BACK) {
   if ((event.getAction() == KeyEvent.ACTION_DOWN)
     && (event.getRepeatCount() == 0)) {

    this.exitApp();
   }
   return true;

  }
  return super.onKeyDown(keyCode, event);
 }

 private void exitApp() {
  long count = System.currentTimeMillis() - exitTime;
  if ((System.currentTimeMillis() - exitTime) > 2000) {
   Toast.makeText(this, "再次点击退出程序！", Toast.LENGTH_SHORT).show();
   exitTime = System.currentTimeMillis();
  } else {
   this.finish();
   onDestroy();
  }
 }

 @Override
 protected void onDestroy() {
  super.onDestroy();
  System.exit(0);
 }