声音播放早于视图更改
Sound plays earlier than view is changed
我正在 android 工作室中创建一个钢琴应用程序:
我的播放按钮有一个点击监听器,当按下它时,录音和播放按钮不可见,而停止按钮在播放录制的声音时可见。
播放按钮
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();
}
}
}
}
});
}
切换按钮可见性的方法
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);
}
}
使用录制和停止按钮,这可以正常工作
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();
}
});
出于某些奇怪的原因,它首先执行 for
循环并在 switchButtonVisibility();
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。有什么方法可以设置它,以便在
执行循环并播放声音?
延迟执行,在视图上发布事件。这将确保在更新视图后立即执行操作:
@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
...
}
}
});
}
我正在 android 工作室中创建一个钢琴应用程序:
我的播放按钮有一个点击监听器,当按下它时,录音和播放按钮不可见,而停止按钮在播放录制的声音时可见。
播放按钮
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();
}
}
}
}
});
}
切换按钮可见性的方法
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);
}
}
使用录制和停止按钮,这可以正常工作
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();
}
});
出于某些奇怪的原因,它首先执行 for
循环并在 switchButtonVisibility();
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。有什么方法可以设置它,以便在
执行循环并播放声音?
延迟执行,在视图上发布事件。这将确保在更新视图后立即执行操作:
@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
...
}
}
});
}