Question

我正在android studio中创建一个钢琴应用程序：

screenshot of app

我的播放按钮有一个点击监听器，当按下该按钮时，应该使录制和播放按钮不可见，并且在录制的声音播放时可以看到停止按钮。

播放按钮

    uri = new URI(  type, params , null );
    URL url = uri.toURL();
    HttpURLConnection conn;
    conn= (HttpURLConnection)url.openConnection();
    conn.setRequestMethod("GET");
    conn.connect();
    int responseCode = conn.getResponseCode();
    System.out.println(" The Response Code  after Sending the SMS : "+responseCode);
    InputStream isr = ((responseCode>= 200)&&(responseCode< 300)) ? conn.getInputStream() : conn.getErrorStream();
    BufferedReader rd = new BufferedReader(new InputStreamReader(isr));
    String line;
    StringBuilder result = new StringBuilder("");
    while((line = rd.readLine()) != null) 
    {
        result.append(line);
    }
    String response = result.toString();
    System.out.println("The Response after Sending the SMS : "+response);

切换按钮可见性的方法

mBtn_Play.setOnClickListener(new View.OnClickListener()
    {
        @Override
        public void onClick(View v)
        {
            mRecordingState = "Playing";
            switchButtonVisibility();

            for (final int sound: mListRecordedSounds )
            {
                if (mRecordingState == "Ready")
                {//break out of loop when stop button is pressed
                    break;
                }
                else {

                    mSoundPool.play(sound, 1,1,1,0,1);
                    try
                    {
                        Thread.sleep(500);
                    }
                    catch (InterruptedException e)
                    {
                        e.printStackTrace();
                    }
                }
            }
        }
    });
}

使用录制和停止按钮，这可以正常工作

private void switchButtonVisibility()
{

    if (mRecordingState != "Ready")
    {
        mBtn_Stop.setVisibility(View.VISIBLE);
        mBtn_Record.setVisibility(View.GONE);
        mBtn_Play.setVisibility(View.GONE);

    }
    else
    {
        mBtn_Stop.setVisibility(View.GONE);
        mBtn_Record.setVisibility(View.VISIBLE);
        mBtn_Play.setVisibility(View.VISIBLE);
    }

}

由于一些奇怪的原因，它首先执行mBtn_Record.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { mListRecordedSounds.clear(); mRecordingState = "Recording"; switchButtonVisibility(); } }); mBtn_Stop.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { mRecordingState = "Ready"; switchButtonVisibility(); } });循环并在for方法更改哪些按钮可见之前播放声音。这似乎没有任何意义，因为该方法在循环之上。有没有办法设置它，以便按钮可见性在之前更改执行循环并播放声音？

Answer 1

延迟执行，在视图上发布事件。这将确保在视图更新后立即执行操作：


    @Override
    public void onClick(View v) {
        mRecordingState = "Playing";
        switchButtonVisibility();

        mBtn_Play.post(new Runnable() {
            @Override
            public void run() {
                for (final int sound : mListRecordedSounds ) {
                    // play the sound here
                    ...
                }
            }
        });
    }

声音比视图更早播放

1 个答案: