我做了一个简单的Android音乐播放器。我想有一个TextView,显示当前时间在歌曲分:秒格式。所以,我想的第一件事是,使活动的Runnable,并把这个在run():
INT位置= 0;
而(MPService.getMP()= NULL和放大器;!&安培;位置< MPService.duration){
尝试 {
视频下载(1000);
位置= MPService.getSongPosition();
}赶上(InterruptedException异常E){
返回;
}
// ...转换位置格式化分:秒串...
currentTime.setText(时间); // currentTime的=(的TextView)findViewById(R.id.current_time);
但是,失败,因为我只能摸一个TextView在其中创建线程。于是我试着用runOnUiThread(),但是,这并不工作,因为那时视频下载(1000)是在主线程中反复调用,因此该活动只是挂在空白屏幕。因此,任何想法如何,我可以解决这个问题?
新的code:
私人诠释的startTime = 0;
私人处理程序timeHandler =新的处理程序();
私人Runnable接口录入=新的Runnable(){
公共无效的run(){
最终诠释开始= startTime时;
INT米利斯= appService.getSongPosition() - 启动;
INT秒=(int)的((米利斯/ 1000)%60);
INT分钟=(int)的((米利斯/ 1000)/ 60);
Log.d(秒,Integer.toString(秒)); //这里没有问题
如果(秒-1,10){
//这个被击中,但文从来没有从0:00原值改变
currentTime.setText(的String.Format(%D:0%D,分,秒));
} 其他 {
currentTime.setText(的String.Format(%D:%D,分,秒));
}
timeHandler.postAtTime(此,(((分钟* 60)+秒+ 1)* 1000));
}
};
私人ServiceConnection onService =新ServiceConnection(){
公共无效onServiceConnected(组件名类名,
的IBinder rawBinder){
AppService服务=((MPService.LocalBinder)rawBinder).getService();
//开始播放歌曲等。
如果(startTime时== 0){
的startTime = appService.getSongPosition();
timeHandler.removeCallbacks(录入);
timeHandler.postDelayed(录入,1000);
}
}
解决方案
使用定时器
本(而不是,而
在里面循环使用 Thread.sleep代码
)。请参阅本文的如何使用定时器来定期更新UI元素的例子:
从计时器更新UI
修改:路回更新的链接,这要归功于 Arialdo
:http://web.archive.org/web/20100126090836/http://developer.android.com/intl/zh-TW/resources/articles/timed-ui-updates.html
编辑2 :路回非链接,感谢 gatoatigrado
: http://android-developers.blogspot.com/2007/11/stitch-in-time.html
I've made a simple Android music player. I want to have a TextView that shows the current time in the song in minutes:seconds format. So the first thing I tried was to make the activity Runnable and put this in run():
int position = 0;
while (MPService.getMP() != null && position<MPService.duration) {
try {
Thread.sleep(1000);
position = MPService.getSongPosition();
} catch (InterruptedException e) {
return;
}
// ... convert position to formatted minutes:seconds string ...
currentTime.setText(time); // currentTime = (TextView) findViewById(R.id.current_time);
But that fails because I can only touch a TextView in the thread where it was created. So then I tried using runOnUiThread(), but that doesn't work because then Thread.sleep(1000) is called repeatedly on the main thread, so the activity just hangs at a blank screen. So any ideas how I can solve this?
new code:
private int startTime = 0;
private Handler timeHandler = new Handler();
private Runnable updateTime = new Runnable() {
public void run() {
final int start = startTime;
int millis = appService.getSongPosition() - start;
int seconds = (int) ((millis / 1000) % 60);
int minutes = (int) ((millis / 1000) / 60);
Log.d("seconds",Integer.toString(seconds)); // no problem here
if (seconds < 10) {
// this is hit, yet the text never changes from the original value of 0:00
currentTime.setText(String.format("%d:0%d",minutes,seconds));
} else {
currentTime.setText(String.format("%d:%d",minutes,seconds));
}
timeHandler.postAtTime(this,(((minutes*60)+seconds+1)*1000));
}
};
private ServiceConnection onService = new ServiceConnection() {
public void onServiceConnected(ComponentName className,
IBinder rawBinder) {
appService = ((MPService.LocalBinder)rawBinder).getService();
// start playing the song, etc.
if (startTime == 0) {
startTime = appService.getSongPosition();
timeHandler.removeCallbacks(updateTime);
timeHandler.postDelayed(updateTime,1000);
}
}
解决方案
Use a Timer
for this (instead of a while
loop with a Thread.Sleep
in it). See this article for an example of how to use a timer to update a UI element periodically:
Updating the UI from a timer
Edit: updated way-back link, thanks to Arialdo
: http://web.archive.org/web/20100126090836/http://developer.android.com/intl/zh-TW/resources/articles/timed-ui-updates.html
Edit 2: non way-back link, thanks to gatoatigrado
: http://android-developers.blogspot.com/2007/11/stitch-in-time.html
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