这是一个定时器的代码，一旦达到0就播放声音（定时器工作正常）。问题是即使onPause()调用了MainActivity.java，声音也会持续存在。
我在onDestroy()中实施了SimpleIntentService.java来停止声音，但显然在调用finish()时，{@ 1}}从未调用过它。当应用程序暂停时，我怎么能让声音停止？
这是我的Activity
MainActivity.java public class MainActivity extends Activity {
private BroadcastReceiver broadcastReceiver;
NumberPicker picker;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
picker = (NumberPicker) findViewById(minutePicker);
Log.i("TurnToTech", "Project Name - SimpleBackgroundService");
picker.setMinValue(0);
picker.setMaxValue(20);
broadcastReceiver = new BroadcastReceiver(){
@Override
public void onReceive(Context arg0, Intent intent) {
String text = intent.getStringExtra(SimpleIntentService.PARAM_OUT_MSG);
Toast.makeText(getApplicationContext(),
text, Toast.LENGTH_SHORT).show();
}
};
}
Intent msgIntent;
public void startTimer(View view) {
setContentView(R.layout.activity_main);
msgIntent = new Intent(this, SimpleIntentService.class);
msgIntent.putExtra(SimpleIntentService.PARAM_IN_MSG, "Alarm: ");
msgIntent.putExtra("time", picker.getValue());
startService(msgIntent);
}
public void onResume() {
super.onResume();
IntentFilter filter = new IntentFilter(SimpleIntentService.ACTION_RESP);
filter.addCategory(Intent.CATEGORY_DEFAULT);
registerReceiver(broadcastReceiver,filter);
}
public void onPause() {
finish();
unregisterReceiver(broadcastReceiver);
super.onPause();
}
}
SimpleIntentService.java答案 0 :(得分：1)
在您的IntentService中，您并未在onDestroy功能中停止相同的闹钟。因为每次你获得它的新实例。
所以我想建议保留Ringtone的公共静态变量，以便可以从任何地方访问它。在MainActivity中声明它们。
public static Ringtone r;
public static Uri alert;
在onCreate的{{1}}函数中初始化它们。
MainActivity现在@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// ... Other statements
// Initialize ringtone here
initializeRingtone();
}
private void initializeRingtone() {
alert = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_ALARM);
r = RingtoneManager.getRingtone(getApplicationContext(), alert);
}
的{{1}}功能应该如下所示
onPause()如果您想在从后台恢复应用程序后播放声音然后计时器用完，您可以考虑在MainActivity public void onPause() {
unregisterReceiver(broadcastReceiver);
r.stop();
super.onPause();
}
函数中执行此类操作>
onResume MainActivity中的public void onResume() {
super.onResume();
registerReceiver(broadcastReceiver);
initializeRingtone(); // Initialize it again.
}
函数可能如下所示。
playSound()希望有所帮助！