我想要像Pushbullet，SmartLockScreen或WhatsApp这样的独立运行服务，等待某些事件发生。我已经尝试了前台服务，在onStartCommand中返回START_STICKY，在onTaskRemoved中重新启动服务，并在使用android：process的单独进程中运行服务。
我的服务类：
public class CallService extends Service {
@Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
@Override
public int onStartCommand (Intent intent, int flags, int startId){
NotificationCompat.Builder builder = new NotificationCompat.Builder(this);
builder.setSmallIcon(R.drawable.icon)
.setContentTitle("title")
.setContentText("text")
.setAutoCancel(true)
.setOngoing(true);
Intent startIntent = new Intent(this, MainActivity.class);
PendingIntent contentIntent = PendingIntent.getActivity(this, 1, startIntent, 0);
builder.setContentIntent(contentIntent);
this.startForeground(1, builder.build());
super.onStartCommand(intent, flags, startId);
return START_STICKY;
}
@Override
public void onCreate() {
super.onCreate();
}
@Override
public void onDestroy() {
super.onDestroy();
}
@Override
public void onTaskRemoved(Intent rootIntent){
Intent restartServiceIntent = new Intent(getApplicationContext(), this.getClass());
restartServiceIntent.setPackage(getPackageName());
PendingIntent restartServicePendingIntent = PendingIntent.getService(getApplicationContext(), 1, restartServiceIntent, PendingIntent.FLAG_ONE_SHOT);
AlarmManager alarmService = (AlarmManager) getApplicationContext().getSystemService(Context.ALARM_SERVICE);
alarmService.set(
AlarmManager.ELAPSED_REALTIME,
SystemClock.elapsedRealtime() + 1000,
restartServicePendingIntent);
super.onTaskRemoved(rootIntent);
}
我的AndroidManifest.xml
<service android:name=".CallService" android:persistent="true">
<intent-filter>
<action android:name="cz.volamakler.CallService" />
</intent-filter>
</service>
<receiver android:name=".CallReceiver">
<intent-filter>
<action android:name="android.intent.action.PHONE_STATE" />
</intent-filter>
<intent-filter>
<action android:name="android.intent.action.NEW_OUTGOING_CALL" />
</intent-filter>
</receiver>
我尝试使用广播接收器，它也被主要活动杀死了。
public abstract class PhoneCallReceiver extends BroadcastReceiver {
//The receiver will be recreated whenever android feels like it. We need a static variable to remember data between instantiations
private static int lastState = TelephonyManager.CALL_STATE_IDLE;
private static Date callStartTime;
private static boolean isIncoming;
private static String savedNumber; //because the passed incoming is only valid in ringing
@Override
public void onReceive(Context context, Intent intent) {
//We listen to two intents. The new outgoing call only tells us of an outgoing call. We use it to get the number.
if (intent.getAction().equals("android.intent.action.NEW_OUTGOING_CALL")) {
savedNumber = intent.getExtras().getString("android.intent.extra.PHONE_NUMBER");
}
else{
String stateStr = intent.getExtras().getString(TelephonyManager.EXTRA_STATE);
String number = intent.getExtras().getString(TelephonyManager.EXTRA_INCOMING_NUMBER);
int state = 0;
if(stateStr.equals(TelephonyManager.EXTRA_STATE_IDLE)){
state = TelephonyManager.CALL_STATE_IDLE;
}
else if(stateStr.equals(TelephonyManager.EXTRA_STATE_OFFHOOK)){
state = TelephonyManager.CALL_STATE_OFFHOOK;
}
else if(stateStr.equals(TelephonyManager.EXTRA_STATE_RINGING)){
state = TelephonyManager.CALL_STATE_RINGING;
}
onCallStateChanged(context, state, number);
}
}
//Derived classes should override these to respond to specific events of interest
protected void onIncomingCallStarted(Context ctx, String number, Date start){}
protected void onOutgoingCallStarted(Context ctx, String number, Date start){}
protected void onIncomingCallEnded(Context ctx, String number, Date start, Date end){}
protected void onOutgoingCallEnded(Context ctx, String number, Date start, Date end){}
protected void onMissedCall(Context ctx, String number, Date start){}
//Deals with actual events
//Incoming call- goes from IDLE to RINGING when it rings, to OFFHOOK when it's answered, to IDLE when its hung up
//Outgoing call- goes from IDLE to OFFHOOK when it dials out, to IDLE when hung up
public void onCallStateChanged(Context context, int state, String number) {
if(lastState == state){
//No change, debounce extras
return;
}
switch (state) {
case TelephonyManager.CALL_STATE_RINGING:
isIncoming = true;
callStartTime = new Date();
savedNumber = number;
onIncomingCallStarted(context, number, callStartTime);
break;
case TelephonyManager.CALL_STATE_OFFHOOK:
//Transition of ringing->offhook are pickups of incoming calls. Nothing done on them
if(lastState != TelephonyManager.CALL_STATE_RINGING){
isIncoming = false;
callStartTime = new Date();
onOutgoingCallStarted(context, savedNumber, callStartTime);
}
break;
case TelephonyManager.CALL_STATE_IDLE:
//Went to idle- this is the end of a call. What type depends on previous state(s)
if(lastState == TelephonyManager.CALL_STATE_RINGING){
//Ring but no pickup- a miss
onMissedCall(context, savedNumber, callStartTime);
}
else if(isIncoming){
onIncomingCallEnded(context, savedNumber, callStartTime, new Date());
}
else{
onOutgoingCallEnded(context, savedNumber, callStartTime, new Date());
}
break;
}
lastState = state;
}
}
public class CallReceiver extends PhoneCallReceiver {
@Override
protected void onIncomingCallStarted(Context ctx, String number, Date start) {
Toast.makeText(ctx, "Call!", Toast.LENGTH_LONG).show();
}
@Override
protected void onOutgoingCallStarted(Context ctx, String number, Date start) {
}
@Override
protected void onIncomingCallEnded(Context ctx, String number, Date start, Date end) {
}
@Override
protected void onOutgoingCallEnded(Context ctx, String number, Date start, Date end) {
}
@Override
protected void onMissedCall(Context ctx, String number, Date start) {
}
}
答案 0 :(得分：1)
发生这种情况是因为您在同一个ui线程中运行服务。使用的Looper与启动服务的应用程序的ui线程相同。您需要执行以下操作：
创建一个单独的处理程序线程。然后在handlemessage中执行您的任务。
public class CallService extends Service {
private Looper mServiceLooper;
private ServiceHandler mServiceHandler;
// Handler that receives messages from the thread
private final class ServiceHandler extends Handler {
public ServiceHandler(Looper looper) {
super(looper);
}
@Override
public void handleMessage(Message msg) {
// Normally we would do some work here, like download a file.
// For our sample, we just sleep for 5 seconds.
long endTime = System.currentTimeMillis() + 5*1000;
while (System.currentTimeMillis() < endTime) {
synchronized (this) {
try {
wait(endTime - System.currentTimeMillis());
} catch (Exception e) {
}
}
}
// Stop the service using the startId, so that we don't stop
// the service in the middle of handling another job
stopSelf(msg.arg1);
}
}
@Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
@Override
public int onStartCommand (Intent intent, int flags, int startId){
// For each start request, send a message to start a job and deliver the
// start ID so we know which request we're stopping when we finish the job
Message msg = mServiceHandler.obtainMessage();
msg.arg1 = startId;
mServiceHandler.sendMessage(msg);
return START_STICKY;
}
@Override
public void onCreate() {
// Start up the thread running the service. Note that we create a
// separate thread because the service normally runs in the process's
// main thread, which we don't want to block. We also make it
// background priority so CPU-intensive work will not disrupt our UI.
HandlerThread thread = new HandlerThread("ServiceStartArguments",
Process.THREAD_PRIORITY_BACKGROUND);
thread.start();
// Get the HandlerThread's Looper and use it for our Handler
mServiceLooper = thread.getLooper();
mServiceHandler = new ServiceHandler(mServiceLooper);
}
@Override
public void onDestroy() {
super.onDestroy();
}
@Override
public void onTaskRemoved(Intent rootIntent){
Intent restartServiceIntent = new Intent(getApplicationContext(), this.getClass());
restartServiceIntent.setPackage(getPackageName());
PendingIntent restartServicePendingIntent = PendingIntent.getService(getApplicationContext(), 1, restartServiceIntent, PendingIntent.FLAG_ONE_SHOT);
AlarmManager alarmService = (AlarmManager) getApplicationContext().getSystemService(Context.ALARM_SERVICE);
alarmService.set(
AlarmManager.ELAPSED_REALTIME,
SystemClock.elapsedRealtime() + 1000,
restartServicePendingIntent);
super.onTaskRemoved(rootIntent);
}
}
我希望这会有所帮助。