[java]
在Android應用程序開發中，可能會遇到跨進程回調問題，比如，調用一個服務，但服務是異步的，服務完成後，需要給客戶一個通知，這時就需要用到跨進程回調了。跨進程回調本質上用到了Binder機制，其過程如下：
1.定義aidl
ITest.aidl
[plain]
package com.example.chirpdemo;
import com.example.chirpdemo.ITestListener;
interface ITest {
int getValue();
void setValue(int value);
void listen(ITestListener listener);
}
ITestListener.aidl
[plain] www.2cto.com
package com.example.chirpdemo;
interface ITestListener {
void onFinished(int result);
}
2.Service定義如下：
[java]
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定義如下：
[java]
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");
} www.2cto.com
@Override
public void onStop() {
super.onStop();
Log.i("aaaaaaaa", "onStop");
}
@Override
protected void onDestroy() {
if (startedService) {
unbindService(myServiceConnection);
}
Log.i(TAG, "onDestroy");
super.onDestroy();
}
}
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