android.os.Messenger#getBinder ( )源码实例Demo

/**
 * Returns true if the messenger object is valid.
 * <p>
 * The messenger constructor and unparceling code does not check whether the
 * provided IBinder is a valid IMessenger object.  As a result, it's possible
 * for a peer to send an invalid IBinder that will result in crashes downstream.
 * This method checks that the messenger is in a valid state.
 * </p>
 */
public static boolean isValidRemoteMessenger(Messenger messenger) {
    try {
        return messenger != null && messenger.getBinder() != null;
    } catch (NullPointerException ex) {
        // If the messenger was constructed with a binder interface other than
        // IMessenger then the call to getBinder() will crash with an NPE.
        return false;
    }
}
 

@Nullable
@Override
public IBinder onBind(Intent intent) {
    Log.d(TAG, "onBind: " + intent.toString());
    if (ACTION_C2DM_REGISTER.equals(intent.getAction())) {
        Messenger messenger = new Messenger(new PushRegisterHandler(this, database));
        return messenger.getBinder();
    }
    return super.onBind(intent);
}
 

@Override
public IBinder onBind(Intent intent) {
    Messenger messenger = new Messenger(new SockHandler());
    return messenger.getBinder();
}
 

@Override
public IBinder onBind(Intent intent) {
    mMessenger = new Messenger(new IncomingHandler(getApplicationContext()));
    return mMessenger.getBinder();
}
 

@Override
public IBinder onBind(Intent intent) {
    mMessenger = new Messenger(new IncomingHandler(getApplicationContext()));
    return mMessenger.getBinder();
}
 

@Override
public IBinder onBind(Intent intent) {
    mMessenger = new Messenger(new IncomingHandler(getApplicationContext()));
    return mMessenger.getBinder();
}
 

public boolean hasMessenger(Messenger other) {
    return mMessenger.getBinder() == other.getBinder();
}