这是一个计时器的代码,一旦声音达到 0(计时器工作正常)。问题是即使在onPause()
MainActivity.java
调用中,声音仍然存在。
我在 SimpleIntentService.java
年实现了 onDestroy()
来停止声音,但显然即使在调用Activity
中有finish()
,它也从未被调用过。当应用程序暂停时,我应该如何使声音停止?
这是我的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();
}
}
还有SimpleIntentService.java
public class SimpleIntentService extends IntentService {
public static final String PARAM_IN_MSG = "in_msg";
public static final String PARAM_OUT_MSG = "out_msg";
int time;
public static final String ACTION_RESP = "org.turntotech.intent.action.MESSAGE_PROCESSED";
public SimpleIntentService() {
super("SimpleIntentService");
}
@Override
protected void onHandleIntent(Intent intent) {
System.out.println("SimpleIntentService Called");
String msg = intent.getStringExtra(PARAM_IN_MSG);
int time = intent.getIntExtra("time", 0);
// Timer implementation
if (time == 0 ){
playSound();
}
while(time > 0){
SystemClock.sleep(5000); // 5 seconds
time -= 5;
String resultTxt = msg + time + " seconds remaining";
Intent broadcastIntent = new Intent();
broadcastIntent.setAction(ACTION_RESP);
broadcastIntent.addCategory(Intent.CATEGORY_DEFAULT);
broadcastIntent.putExtra(PARAM_OUT_MSG, resultTxt);
broadcastIntent.putExtra("time", time);
sendBroadcast(broadcastIntent);
if (time == 0) {
playSound();
}
}
}
Uri alert;
public void playSound(){
alert = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_ALARM);
Ringtone r = RingtoneManager.getRingtone(getApplicationContext(), alert);
r.play();
}
public void onDestroy() {
Ringtone r = RingtoneManager.getRingtone(getApplicationContext(), alert);
r.stop();
super.onDestroy();
}
}
在您的IntentService
中,您并没有真正停止onDestroy
功能中的相同警报。因为每次你都会得到它的新实例。
因此,我想建议保留一个公共静态变量Ringtone
以便可以从任何地方访问它。在您的MainActivity
中声明它们。
public static Ringtone r;
public static Uri alert;
在MainActivity
的onCreate
函数中初始化它们。
@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);
}
现在,MainActivity
的onPause()
函数应如下所示
public void onPause() {
unregisterReceiver(broadcastReceiver);
r.stop();
super.onPause();
}
如果您想在从后台恢复应用程序然后计时器用完后播放声音,您可以考虑在MainActivity
的onResume
功能中执行类似操作
public void onResume() {
super.onResume();
registerReceiver(broadcastReceiver);
initializeRingtone(); // Initialize it again.
}
IntentService
中的playSound()
函数可能如下所示。
public void playSound(){
// Initialize the alert and ringtone again.
MainActivity.alert = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_ALARM);
MainActivity.r = RingtoneManager.getRingtone(getApplicationContext(), alert);
MainActivity.r.play();
}
public void onDestroy() {
MainActivity.r.stop();
super.onDestroy();
}
希望对您有所帮助!