Service 回调 Activity的方法。

这两天研究Android Service，前面已经贴了几遍文章。

下面一个主题就是 ：Service 回调 Activity的方法。

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package com.test;

import com.test.service.IService;
import com.test.service.MyService;
import android.app.Activity;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.IBinder;
import android.os.RemoteException;
import android.util.Log;

public class ServiceCallbackActivity extends Activity {

private static final String TAG = "MyService";
private IService mService;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Intent i = new Intent(this, MyService.class);
bindService(i, mConnection, Context.BIND_AUTO_CREATE);

}

@Override
protected void onDestroy() {
// TODO Auto-generated method stub
if (mService != null) {
try {
mService.unregisterCallback(mCallback);
} catch (RemoteException e) {
Log.e(TAG, "", e);
}
}
// destroy的时候不要忘记unbindService
unbindService(mConnection);
super.onDestroy();
}

private ICallback.Stub mCallback = new ICallback.Stub() {

@Override
public void showResult(String result) {
Log.d(TAG, " result : " + result);
}
};

private ServiceConnection mConnection = new ServiceConnection() {

@Override
public void onServiceDisconnected(ComponentName name) {
Log.d(TAG, "onServiceDisconnected");
mService = null;
}

@Override
public void onServiceConnected(ComponentName name, IBinder service) {
Log.d(TAG, "onServiceConnected");
mService = IService.Stub.asInterface(service);
try {
mService.registerCallback(mCallback);
} catch (RemoteException e) {
Log.e(TAG, "", e);
}

}

};

}

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ICallback.aidl

package com.test;

interface ICallback {
void showResult(String result);
}

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package com.test.service;

import com.test.ICallback;

import android.app.Service;
import android.content.Intent;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.os.RemoteCallbackList;
import android.os.RemoteException;
import android.util.Log;

public class MyService extends Service {

private final static String TAG = "MyService";

private RemoteCallbackList<ICallback> mCallbacks = new RemoteCallbackList<ICallback>();

private IService.Stub mBinder = new IService.Stub() {

@Override
public void unregisterCallback(ICallback cb) throws RemoteException {
if (cb != null)
mCallbacks.unregister(cb);
}

@Override
public void registerCallback(ICallback cb) throws RemoteException {
if (cb != null)
mCallbacks.register(cb);
}
};

@Override
public IBinder onBind(Intent arg0) {
return mBinder;
}

@Override
public void onCreate() {
Log.d(TAG, "MyService onCreate");
// mHandler.sendEmptyMessageDelayed(0, 1000);
super.onCreate();
// callBack();
}

@Override
public void onDestroy() {
Log.d(TAG, "MyService onDestroy");
mHandler.removeMessages(0);
super.onDestroy();
}

@Override
public void onStart(Intent intent, int startId) {
Log.d(TAG, "MyService onStart" + startId);
callBack();
super.onStart(intent, startId);
}

private void callBack() {
int n = mCallbacks.beginBroadcast();
Log.i(TAG, "mCallbacks.beginBroadcast() is " + n);
try {
for (int i = 0; i < n; i++) {
mCallbacks.getBroadcastItem(i)
.showResult("dddd liud MyService");
}
} catch (RemoteException e) {
Log.e(TAG, "", e);
}
mCallbacks.finishBroadcast();
}

private Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
callBack();
super.handleMessage(msg);
}
};

}

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IService.aidl

package com.test.service;

import com.test.ICallback;

interface IService {
void registerCallback(ICallback cb);
void unregisterCallback(ICallback cb);
}

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