我试图在Service内运行天文台。但我无法运行它。我在Activity按一个按钮，该事件被传递给Service。如果按下按钮然后启动Chronometer但问题是setOnChronometerTickListener只被调用一次并且它停止。我哪里弄错了？这是我的Service和Activity类：
服务类：
public class TimerService extends Service {
NotificationManager notificationManager;
NotificationCompat.Builder mBuilder;
Callbacks activity;
private final IBinder mBinder = new LocalBinder();
private Chronometer chronometer;
SharedPreferences sharedPreferences;
private int state = 0; //0 means stop state,1 means play, 2 means pause
private boolean running = false;
private long pauseOffSet = -1;
@Subscribe(threadMode = ThreadMode.MAIN)
public void onMessageEvent(MessageEvent event) {
if (event.message) {
if (!running) {
if (pauseOffSet != -1) {
pauseOffSet = sharedPreferences.getLong("milli", -1);
}
chronometer.setBase(SystemClock.elapsedRealtime() - pauseOffSet);
chronometer.start();
state = 1;
pauseOffSet = 0;
running = true;
}
} else {
if (running) {
chronometer.stop();
pauseOffSet = SystemClock.elapsedRealtime() - chronometer.getBase();
state = 2;
running = false;
}
}
}
@Override
public void onCreate() {
super.onCreate();
EventBus.getDefault().register(this);
}
@Override
public void onDestroy() {
EventBus.getDefault().unregister(this);
super.onDestroy();
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
sharedPreferences = getSharedPreferences("myprefs", MODE_PRIVATE);
chronometer = new Chronometer(this);
state = sharedPreferences.getInt("state", 0);
chronometer.setOnChronometerTickListener(new Chronometer.OnChronometerTickListener() {
@Override
public void onChronometerTick(Chronometer chronometer) {
Log.e("TimerService","timer");
pauseOffSet = SystemClock.elapsedRealtime() - chronometer.getBase();
if (pauseOffSet >= 79200000) {
chronometer.setBase(SystemClock.elapsedRealtime());
chronometer.stop();
running = false;
// progressBar.setProgress(0);
} else {
chronometer.setText(setFormat(pauseOffSet));
// int convertTime = (int) pauseOffSet;
// progressBar.setProgress(convertTime);
}
if (activity != null) {
activity.updateClient(pauseOffSet);
}
}
});
if (state == 1) { // its in play mode
running = true;
chronometer.setBase(SystemClock.elapsedRealtime() - sharedPreferences.getLong("milli", 0));
chronometer.start();
} else if (state == 2) { //its in pause mode
running = false;
pauseOffSet = sharedPreferences.getLong("milli", -1);
long time = SystemClock.elapsedRealtime() - pauseOffSet;
chronometer.setBase(time);
int convertTime = (int) pauseOffSet;
// progressBar.setProgress(convertTime);
} else {
running = false;
}
//Do what you need in onStartCommand when service has been started
return START_NOT_STICKY;
}
@Override
public IBinder onBind(Intent intent) {
return mBinder;
}
//returns the instance of the service
public class LocalBinder extends Binder {
public TimerService getServiceInstance() {
return TimerService.this;
}
}
//Here Activity register to the service as Callbacks client
public void registerClient(Activity activity) {
this.activity = (Callbacks) activity;
}
//callbacks interface for communication with service clients!
public interface Callbacks {
public void updateClient(long data);
}
String setFormat(long time) {
int h = (int) (time / 3600000);
int m = (int) (time - h * 3600000) / 60000;
int s = (int) (time - h * 3600000 - m * 60000) / 1000;
String hh = h < 10 ? "0" + h : h + "";
String mm = m < 10 ? "0" + m : m + "";
String ss = s < 10 ? "0" + s : s + "";
return hh + ":" + mm + ":" + ss;
}
}
这是我的Activity类：
public class MainActivity extends AppCompatActivity implements View.OnClickListener, TimerService.Callbacks {
private static final String TAG = MainActivity.class.getSimpleName();
Chronometer tvTextView;
Button btnStart, btnStop;
private int state = 0; //0 means stop state,1 means play, 2 means pause
SharedPreferences sharedPreferences;
private boolean running = false;
private long pauseOffSet = -1;
ProgressBar progressBar;
Intent serviceIntent;
TimerService myService;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tvTextView = findViewById(R.id.textview);
progressBar = findViewById(R.id.puzzleProgressBar);
btnStart = findViewById(R.id.button1);
btnStop = findViewById(R.id.button2);
btnStart.setOnClickListener(this);
btnStop.setOnClickListener(this);
serviceIntent = new Intent(this, TimerService.class);
sharedPreferences = getSharedPreferences("myprefs", MODE_PRIVATE);
state = sharedPreferences.getInt("state", 0);
tvTextView.setOnChronometerTickListener(new Chronometer.OnChronometerTickListener() {
@Override
public void onChronometerTick(Chronometer chronometer) {
long time = SystemClock.elapsedRealtime() - chronometer.getBase();
pauseOffSet = time;
Log.e(TAG, "pauseOffSet " + pauseOffSet);
if (time >= 79200000) {
tvTextView.setBase(SystemClock.elapsedRealtime());
tvTextView.stop();
running = false;
progressBar.setProgress(0);
} else {
chronometer.setText(setFormat(time));
int convertTime = (int) time;
progressBar.setProgress(convertTime);
}
}
});
startService(serviceIntent); //Starting the service
bindService(serviceIntent, serviceConnection, Context.BIND_AUTO_CREATE); //Binding to the service!
}
private ServiceConnection serviceConnection = new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
TimerService.LocalBinder binder = (TimerService.LocalBinder) service;
myService = binder.getServiceInstance();
myService.registerClient(MainActivity.this);
Log.e(TAG, "service connected");
}
@Override
public void onServiceDisconnected(ComponentName name) {
Log.e(TAG, "service disconnected");
}
};
public void onClick(View v) {
if (btnStart == v) {
EventBus.getDefault().post(new MessageEvent(true));
} else if (btnStop == v) {
EventBus.getDefault().post(new MessageEvent(false));
}
}
@Override
protected void onStop() {
super.onStop();
sharedPreferences.edit().putLong("milli", pauseOffSet).commit();
sharedPreferences.edit().putInt("state", state).commit();
}
String setFormat(long time) {
int h = (int) (time / 3600000);
int m = (int) (time - h * 3600000) / 60000;
int s = (int) (time - h * 3600000 - m * 60000) / 1000;
String hh = h < 10 ? "0" + h : h + "";
String mm = m < 10 ? "0" + m : m + "";
String ss = s < 10 ? "0" + s : s + "";
return hh + ":" + mm + ":" + ss;
}
@Override
public void updateClient(long data) {
Log.d(TAG, "Data from service" + data);
}
}
Chronometer是一个View，也就是UI元素。你永远不会把你的天文台添加到任何布局，我想这就是为什么它永远不会更新。
您可以尝试使用CountDownTimer或Handler / Runnable组合。
http://developer.android.com/reference/android/os/CountDownTimer.html http://developer.android.com/reference/android/os/Handler.html
这是一个使用Handler / Runnable的例子，我甚至用stopTimer()方法进行了测量：
private Handler timerHandler;
private Runnable timerRunnable;
// ...
@Override
public void onCreate() {
super.onCreate();
Log.d(LOG_TAG, "TimerService created");
timerHandler = new Handler();
timerRunnable = new Runnable() {
@Override
public void run() {
Log.d(LOG_TAG, "TICK");
timerHandler.postDelayed(timerRunnable, 1000);
}
};
}
public void startTimer() {
Log.d(LOG_TAG, "Timer started");
timerHandler.post(timerRunnable);
}
public void stopTimer() {
Log.d(LOG_TAG, "Timer stopped");
timerHandler.removeCallbacks(timerRunnable);
}