如何找到上次重新啓動android的時間？

我試圖找到使用服務和broadcastreceiver最後一次android重新啓動的時間。我的「廣播」類應該記錄重新啓動後的時間。在「OnCreate」方法計算時間，但它不起作用。如何找到上次重新啓動android的時間？

我在做什麼錯？

我的「服務器」類：

public class Server extends Service{ 

IBinder mBinder = new LocalBinder(); 

@Override 
public IBinder onBind(Intent intent) { 
    return mBinder; 
} 

public class LocalBinder extends Binder { 
    public Server getServerInstance() { 
     return Server.this; 
    } 
} }

我的「客戶」類：

public class Client extends Activity { 

boolean mBounded; 
Server mServer; 
TextView text; 
Button button; 
Broadcast bc = new Broadcast(); 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 

    text = (TextView)findViewById(R.id.text); 
    button = (Button) findViewById(R.id.button); 

    Intent mIntent = new Intent(this, Server.class); 
    bindService(mIntent, mConnection, BIND_AUTO_CREATE); 

    button.setOnClickListener(new OnClickListener() { 

     public void onClick(View v) { 
      text.setText(String.valueOf(System.currentTimeMillis() - bc.t)); 
     } 
    }); 
} 

@Override 
protected void onStart() { 
    super.onStart(); 
    Intent mIntent = new Intent(this, Server.class); 
    bindService(mIntent, mConnection, BIND_AUTO_CREATE); 
} 

ServiceConnection mConnection = new ServiceConnection() { 

    public void onServiceDisconnected(ComponentName name) { 
     Toast.makeText(Client.this, "Service is disconnected", Toast.LENGTH_LONG).show(); 
     mBounded = false; 
     mServer = null; 
    } 

    public void onServiceConnected(ComponentName name, IBinder service) { 
     Toast.makeText(Client.this, "Service is connected", Toast.LENGTH_LONG).show(); 
     mBounded = true; 
     LocalBinder mLocalBinder = (LocalBinder)service; 
     mServer = mLocalBinder.getServerInstance(); 
    } 
}; 

@Override 
protected void onStop() { 
    super.onStop(); 
    if(mBounded) { 
     unbindService(mConnection); 
     mBounded = false; 
    } 
}}

「廣播」類：

public class Broadcast extends BroadcastReceiver { 
public long t; 
@Override 
public void onReceive(Context context, Intent intent) { 
    t = System.currentTimeMillis(); 
    Intent serviceLauncher = new Intent(context, Server.class); 
    context.startService(serviceLauncher); 
}}

清單：

<receiver android:name="com.example.serv.Broadcast" android:enabled="true" android:exported="false"> 
     <intent-filter> 
      <action android:name="android.intent.action.BOOT_COMPLETED" /> 
     </intent-filter> 
    </receiver> 
    <service android:enabled="true" android:name=".Server"/>

來源

2014-03-28 user3473445