我需要ProgressDialog.dismiss
从我的音乐服务中进行设置。我试过设置 AsyncTask
final class TheTask extends AsyncTask<Void, Void, Void>{
ProgressDialog dialog = ProgressDialog.show(SomafmActivity.this, "",
"Loading. Please wait...", true);
@Override
protected void onPreExecute() {
dialog.show();
}
@Override
protected Void doInBackground(Void... params) {
final Intent i = new Intent(MusicService.ACTION_URL);
Uri uri = Uri.parse("http://sfstream1.somafm.com:8880");
i.setData(uri);
startService(i);
return null;
}
@Override
protected void onPostExecute(Void result) {
dialog.dismiss();
}
这工作正常,但它在startService(i) 调用开始时关闭对话框,因此对话框立即消失。然后我尝试从 MusicService 服务访问我的 ProgressDialog:
我的主要活动中的 ProgressDialog 声明:
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.somafm);
ProgressDialog dialog = ProgressDialog.show(SomafmActivity.this, "",
"Loading. Please wait...", true);
}
在我的 MusicService 中:
public void onPrepared(MediaPlayer player) {
// The media player is done preparing. That means we can start playing!
mState = State.Playing;
updateNotification(mSongTitle + " (playing)");
configAndStartMediaPlayer();
ProgressDialog dialog = (ProgressDialog) SomafmActivity.dialog; //This line I believe is wrong
dialog.dismiss();
}
但我在 LogCat 中得到了 NullPointerException。我很确定从该位置关闭对话框会起到作用,因为直到流加载并开始播放后我才会收到错误消息。
我的问题是,我应该如何从我的音乐服务中正确引用我的 ProgressDialog?