Question

我正在尝试控制手机的后退按钮，并在按下后键时设置一个看不见的布局，但没有任何内容出现。我想知道是否有可能这样做。

public boolean onKeyDown(int keyCode, KeyEvent ev) {

    switch(keyCode) {

    case KeyEvent.KEYCODE_BACK:

        if (main_layout.getVisibility() == View.VISIBLE) {

           finish();

        } else if (sub_layout.getVisibility() == View.VISIBLE){

            boutton_radio.setVisibility(View.VISIBLE);

            boutton_radio.setEnabled(true);

            sub_layout.setEnabled(false);

            sub_layout.setVisibility(View.GONE);

            main_layout.setVisibility(View.VISIBLE);

            main_layout.setEnabled(true);
        }


    return true;

    }
    return false;

    }

按下后退按钮也会给出相同的结果

@覆盖

public void onBackPressed() {

    // TODO Auto-generated method stub

}

Answer 1

是的，我应该工作。我用它来做另一个功能，它也适合你。这就是我按下后退键时调用警报框的方法。

@Override
    public void onBackPressed() {
        final MediaPlayer areusure = MediaPlayer.create(TalkingWebBrowserActivity.this, R.raw.areusure);
        areusure.start();
        AlertDialog alertbox = new AlertDialog.Builder(this)
        .setMessage("Do you want to exit the Browser?")
        .setPositiveButton("Yes", new DialogInterface.OnClickListener() {

            // do something when the button is clicked
            public void onClick(DialogInterface arg0, int arg1) {

                finish();

            }
        })
        .setNegativeButton("No", new DialogInterface.OnClickListener() {

            // do something when the button is clicked
            public void onClick(DialogInterface arg0, int arg1) {
                           }
        })
          .show();

    }

Answer 2

你走在正确的道路上。：）

public void onBackPressed() {

if (main_layout.getVisibility() == View.VISIBLE) {

       finish();

    } else if (sub_layout.getVisibility() == View.VISIBLE){

        boutton_radio.setVisibility(View.VISIBLE);

        boutton_radio.setEnabled(true);

        sub_layout.setEnabled(false);

        sub_layout.setVisibility(View.GONE);

        main_layout.setVisibility(View.VISIBLE);

        main_layout.setEnabled(true);
    }

}

Answer 3

为什么你要检查两个不同的东西。如果你输入你的其他if（main_layout.getVisability而不是sub main。试试看，告诉我这是否解决了

将onBackkeyPressed（）覆盖为可见或不可见的布局

3 个答案: