Android中的跨进程回调

在Android应用程序开发中，可能会遇到跨进程回调问题，比如，调用一个服务，但服务是异步的，服务完成后，需要给客户一个通知，这时就需要用到跨进程回调了。跨进程回调本质上用到了Binder机制，其过程如下：

1.定义aidl

ITest.aidl

package com.example.chirpdemo;import com.example.chirpdemo.ITestListener;interface ITest {int getValue();void setValue(int value);void listen(ITestListener listener);}

ITestListener.aidl

package com.example.chirpdemo;interface ITestListener {void onFinished(int result);}

2.Service定义如下：

package com.example.chirpdemo;import android.app.Service;import android.content.Intent;import android.os.IBinder;import android.os.RemoteException;import android.util.Log;public class MyService extends Service {    final private static String TAG = "MyService";    public class ServiceImpl extends ITest.Stub {        private int mValue;        private ITestListener mListener;        public ServiceImpl() {            mValue = 0;        }        @Override        public int getValue() throws RemoteException {            return mValue;        }        @Override        public void setValue(int value) throws RemoteException {            mValue = value;            if (null != mListener) {                mListener.onFinished(-1);            }        }        @Override        public void listen(ITestListener listener) throws RemoteException {            mListener = listener;        }    }    @Override    public void onCreate() {        Log.d(TAG, "onCreate");        super.onCreate();    }    @Override    public void onDestroy() {        Log.d(TAG, "onDestroy");        super.onDestroy();    }    @Override    public void onStart(Intent intent, int startId) {        Log.d(TAG, "onStart");        super.onStart(intent, startId);    }    @Override    public int onStartCommand(Intent intent, int flags, int startId) {        Log.d(TAG, "onStartCommand");        return super.onStartCommand(intent, flags, startId);    }    @Override    public boolean onUnbind(Intent intent) {        Log.d(TAG, "onUnbind");        return super.onUnbind(intent);    }    @Override    public void onRebind(Intent intent) {        Log.d(TAG, "onRebind");        super.onRebind(intent);    }    @Override    public IBinder onBind(Intent arg0) {        return new ServiceImpl();    }}

3.Client定义如下：

package com.example.easytabdemo;import android.app.Activity;import android.content.ComponentName;import android.content.Context;import android.content.Intent;import android.content.ServiceConnection;import android.graphics.PixelFormat;import android.graphics.drawable.Drawable;import android.os.Bundle;import android.os.IBinder;import android.os.RemoteException;import android.util.Log;import android.view.View;import android.view.View.OnClickListener;import android.view.ViewGroup;import android.widget.Button;import android.widget.EditText;import android.widget.TextView;import com.example.chirpdemo.ITest;import com.example.chirpdemo.ITestListener;import com.example.easytabdemo.SlideTabHost.TabSpec;public class MainActivity extends Activity {    final private static String TAG = "MainActivity";            final Intent myIntent = new Intent("com.pyk.les.IlongExistService");    private boolean startedService = false;    private ITest leservice = null;    ServiceConnection myServiceConnection = new ServiceConnection() {        @Override        public void onServiceConnected(ComponentName name, IBinder service) {            leservice = ITest.Stub.asInterface(service);                        try {                leservice.listen(new ITestListener.Stub() {                    @Override                    public void onFinished(int result) throws RemoteException {                    }                                    });            } catch (RemoteException e) {                // TODO Auto-generated catch block                e.printStackTrace();            }        }        @Override        public void onServiceDisconnected(ComponentName name) {            leservice = null;            Log.i("aaaaaaaaaaaa", "onDisconnected:" + Thread.currentThread());        }    };    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        startedService = bindService(new Intent("com.my.IService"),                myServiceConnection, BIND_AUTO_CREATE);        Log.i("aaaaaaaaaaaa", "bindService:" + Thread.currentThread());                Button bt = (Button)this.findViewById(R.id.bt1);        bt.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View arg0) {                if ( startedService ) {                    if ( null != leservice ) {                        try {                            leservice.setValue(leservice.getValue() + 1);                        } catch (RemoteException e) {                            e.printStackTrace();                        }                    }                }            }        });                view.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View arg0) {                if ( startedService ) {                    if ( null != leservice ) {                        try {                            mEditText.setText(leservice.getValue() + "");                        } catch (RemoteException e) {                            e.printStackTrace();                        }                    }                }            }        });    }    @Override    public void onStart() {        super.onStart();        Log.i("aaaaaaaa", "onStart");    }    @Override    public void onPause() {        super.onPause();        Log.i("aaaaaaaa", "onPause");    }    @Override    public void onResume() {        super.onResume();        Log.i("aaaaaaaa", "onResume");    }    @Override    public void onStop() {        super.onStop();        Log.i("aaaaaaaa", "onStop");    }    @Override    protected void onDestroy() {        if (startedService) {            unbindService(myServiceConnection);        }        Log.i(TAG, "onDestroy");        super.onDestroy();    }}

在以上代码中ITestListener为跨进程回调接口

作者：jcgu 发表于2013-3-1 16:30:52 原文链接阅读：48 评论：0 查看评论

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