Question

我在做什么 ::

我正在尝试检查是否退出按下后退键上的应用程序的条件

发生了什么 ::

我可以启动对话框，但在我可以在对话框

中进行任何选择之前，立即删除了活动

我该如何解决这个问题？

public boolean onKeyDown(int keyCode, KeyEvent event)
{
    if (keyCode == KeyEvent.KEYCODE_BACK)
    {
           /*FragmentManager.BackStackEntry backEntry=getSupportFragmentManager().getBackStackEntryAt(getFragmentManager().getBackStackEntryCount()-1);
            String str=backEntry.getName();
            Log.d("Back-Name", str);*/


        if(getSupportFragmentManager().findFragmentByTag("HomeFragment")!=null ){
            Log.d("My-Log-Msg","$-before-showDialog-$");
            showGpsDialog();
            Log.d("My-Log-Msg","$-after-showDialog-$");
        }else
        {
            /*Intent intent = getIntent();
            finish();
            startActivity(intent);*/
            ft.replace(R.id.content_frame, fragment1,"HomeFragment");
        }
    }
    return super.onKeyDown(keyCode, event);
}


public void showGpsDialog(){
    //GPS-Dialog
    WillYouQuitAppDialog quitAlert;
    try {
        quitAlert = new WillYouQuitAppDialog();
        quitAlert.show(getSupportFragmentManager(), "GpsAlert_Tag");
    } catch (Exception e) {
        // TODO Auto-generated catch block
        Log.d("My-Log-Msg",e.toString());
        e.printStackTrace();
    }
}

Answer 1

使用以下代码：

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_BACK) {
        // your code
        return true;
    }

    return super.onKeyDown(keyCode, event);
}

或使用onBackPressed：

@Override
public void onBackPressed() {
    // code of condition or anything else that you want
}

在android中使用onKeyDown或onBackKey

1 个答案: