Activity中使用AIDL让Service与Activity通信.doc

简易计算器,默认执行1+1的计算,点击go按钮执行计算,先看效果图,如下 首先建立一个ICallback.aidl文件,作为Activity中的回调方法Java代码/ My AIDL file, named SomeClass.aidlpackage com.zhang.test.service;/ See the list above for which classes need/ import statements (hint-most of them)/ Declare the erface ICallback / Methods can take 0 or more parameters, and/ return a value or void./ Methods can even take other AIDL-defined parameters./BankAccount createAccount(in String name, int startingDeposit, in IAtmService atmService);/ All non-Java primitive parameters (e.g., int, bool, etc) require/ a directional tag indicating which way the data will go. Available/ values are in, out, inout. (Primitives are in by default, and cannot be otherwise)./ Limit the direction to what is truly needed, because marshalling parameters/ is expensive.void showResult(int result);复制代码然后再建立一个IService.aidl用来在Activity中接收Service回调,以及在Service中onBind时返回的Binder 注意:aidl中import不能写com.xxx.*,要写全类的路径 Java代码 package com.zhang.test.service;import com.zhang.test.service.ICallback;interface IService void registerCallback(ICallback cb); void unregisterCallback(ICallback cb);复制代码接下来是service,CalculateService.java Java代码package com.zhang.test.service;import android.app.Service;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.content.IntentFilter;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 CalculateService extends Service private static final String TAG = MainService; public static final String ACTION_CALCUlATE = action_calculate; private RemoteCallbackList mCallbacks = new RemoteCallbackList(); private IService.Stub mBinder = new IService.Stub() Override public void unregisterCallback(ICallback cb) if (cb != null) mCallbacks.unregister(cb); Override public void registerCallback(ICallback cb) if (cb != null) mCallbacks.register(cb); ; /这里的BroadcastReceiver实现了Activity主动与Service通信 private BroadcastReceiver receiver = new BroadcastReceiver() Override public void onReceive(Context context, Intent intent) String action = intent.getAction(); if (ACTION_CALCUlATE.equals(action) int first; int second; try first = Integer.parseInt(intent.getStringExtra(first); second = Integer.parseInt(intent.getStringExtra(second); callBack(first, second); catch (NumberFormatException e) e.printStackTrace(); catch (Exception e) e.printStackTrace(); ; private Handler mHandler = new Handler() Override public void handleMessage(Message msg) /默认计算1+1 callBack(1, 1); super.handleMessage(msg); ; Override public IBinder onBind(Intent intent) Log.d(TAG, onBind); return mBinder; Override public void onCreate() Log.d(TAG, onCreate); / 这里不知道为什么,直接使用callback方法回调showResult / mCallbacks.beginBroadcast()是0,需要用handler延迟1000毫秒 / 也许是在activity中binService太耗时的原因? mHandler.sendEmptyMessageDelayed(0, 1000); super.onCreate(); IntentFilter filter = new IntentFilter(ACTION_CALCUlATE); registerReceiver(receiver, filter); Override public void onDestroy() mHandler.removeMessages(0); mCallbacks.kill(); super.onDestroy(); private void callBack(int first, int second) int N = mCallbacks.beginBroadcast(); try for (int i = 0; i N; i+) mCallbacks.getBroadcastItem(i).showResult(first + second); catch (RemoteException e) Log.e(TAG, , e); mCallbacks.finishBroadcast(); 复制代码然后是CalculateActivity: Java代码package com.zhang.test;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;import android.view.View;import android.widget.Button;import android.widget.CompoundButton;import android.widget.EditText;import android.widget.TextView;import com.zhang.test.service.ICallback;import com.zhang.test.service.IService;import com.zhang.test.service.CalculateService;public class CalculateActivity extends Activity private static final String TAG = MainActivity; private IService mService; private EditText first;/ 第一个计算数 private EditText second;/ 第二个计算数 private Button calculate;/ 计算按钮 private TextView result;/ 计算结果 /* Called when the activity is first created. */ Override public void onCreate(Bundle savedInstanceState) super.onCreate(savedInstanceState); setContentView(R.layout.main); setUpViews(); setUpEvents(); Intent i = new Intent(this, CalculateService.class); bindService(i, mConnection, Context.BIND_AUTO_CREATE); private void setUpViews() first = (EditText) findViewById(R.id.first); second = (EditText) findViewById(R.id.second); calculate = (Button) findViewById(R.id.calculate); result = (TextView) findViewById(R.id.result); private void setUpEvents() calculate.setOnClickListener(new CompoundButton.OnClickListener() Override public void onClick(View v) Intent intent = new Intent(CalculateService.ACTION_CALCUlATE); intent.putExtra(first, first.getText().toString(); intent.putExtra(second, second.getText().toString(); sendBroadcast(intent); ); Override protected void onDestroy() 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(); /* * service的回调方法 */ private ICallback.Stub mCallback = new ICallback.Stub() Override public void showResult(int result) Log.d(TAG, result : + result); CalculateActivity.this.result.setText(result + ); ; /* * 注册connection */ private ServiceConnection mConnection = new ServiceConnection() Override public void onServiceDisconnected(Comp