如何实现跨应用绑定Service的通信

在上一篇博文点击打开链接的基础上,我们继续实现通过AIDL绑定外部Service后的通信问题.

需要实现的效果是,在另一个应用的App2Activity2中的EditText中动态的输入内容,然后点击提交后,把数据传递到目标服务AppService中打印.

步骤如下:

1.在上一篇博文的aidl接口文件的基础上,我们需要对其进行修改,加多一个方法用于接收一个String类型的参数.目的是用于建立通信后,发送数据用的.

// IAppServiceInterface.aidl
package com.example.mchenys.aidlservicedemo;

// Declare any non-default types here with import statements

interface IAppServiceInterface {
/**
* Demonstrates some basic types that you can use as parameters
* and return values in AIDL.
*/
void basicTypes(int anInt, long aLong, boolean aBoolean, float aFloat,
double aDouble, String aString);

void setData(String data);

}

2.需要在App2Activity2所在的工程中,创建一个AIDL文件夹,可以通过Android Studio的向导来创建,然后在里面创建一个包名和目标应用的aidl文件相同的包.并将目标应用的aidl文件拷贝到刚刚创建的包内.





3.修改AppService类:

package com.example.mchenys.aidlservicedemo;

import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.os.RemoteException;
import android.os.SystemClock;
import android.util.Log;

public class AppService extends Service {
private String data = "默认数据";
private boolean isRunning = true;
public AppService() {
}

@Override
public IBinder onBind(Intent intent) {
Log.i("AppService", "onBind");

//通过向导生成了aidl文件后,需要Rebuild Project后,在onBind方法中就可以直接创建IAppServiceInterface.Stub对象了.
return new IAppServiceInterface.Stub() {
@Override
public void basicTypes(int anInt, long aLong, boolean aBoolean, float aFloat, double aDouble, String aString) throws RemoteException {
}

@Override
public void setData(String data) throws RemoteException {
AppService.this.data = data;
}
};
}

@Override
public void onCreate() {
super.onCreate();
Log.i("AppService", "onCreate");
new Thread(new Runnable() {
@Override
public void run() {
while (isRunning) {
SystemClock.sleep(1000);
Log.i("AppService", "接收到的数据是:" + data);
}
}
}).start();
}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
if (null != intent) {
Log.i("AppService", "onStartCommand接收到的数据是:" + intent.getStringExtra("data"));
}
return super.onStartCommand(intent, flags, startId);
}

@Override
public void onDestroy() {
super.onDestroy();
Log.i("AppService", "onDestroy");
isRunning = false;
}
}

4.修改App2Activity2类:

package com.example.mchenys.app2;

import android.app.Activity;
import android.content.ComponentName;
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.EditText;

import com.example.mchenys.aidlservicedemo.IAppServiceInterface;

/**
* Created by mChenys on 2015/11/1.
*/
public class App2Activity2 extends Activity {
//创建aidl接口引用
private IAppServiceInterface mIAppServiceInterface = null;
//创建ServiceConnection接口的实现类对象,用于监听Service的链接和断开连接
private MyServiceConnection conn = new MyServiceConnection();

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity2_app2);
//创建绑定的目标AppService的显示意图
final Intent intent = new Intent();
intent.setComponent(new ComponentName("com.example.mchenys.aidlservicedemo", "com.example.mchenys.aidlservicedemo.AppService"));
//绑定服务
findViewById(R.id.id_btn_bind).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
bindService(intent, conn, BIND_AUTO_CREATE);
}
});
//解绑服务
findViewById(R.id.id_btn_unbind).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
unbindService(conn);
mIAppServiceInterface = null;
}
});
//获取EditText中录入的文本
EditText editText = (EditText) findViewById(R.id.id_edt_input);
final String data = editText.getText().toString();
//提交数据
findViewById(R.id.id_btn_submit).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (null != mIAppServiceInterface) {
try {
//调用aidl接口新定义的方法,动态传递参数
mIAppServiceInterface.setData(data);
} catch (RemoteException e) {
e.printStackTrace();
}
}
}
});
}

/**
* 创建ServiceConnection接口的实现类
*/
private class MyServiceConnection implements ServiceConnection {

@Override
public void onServiceConnected(ComponentName name, IBinder service) {
/**
* 当服务建立连接的时候,就可以在此方法中拿到aidl接口的实现类了,即参数service
* 注意此时不能直接直接对service进行强制类型转换,因为虽然aidl接口的名字是相同,
* 当时他们是存在2个不同的应用中的,我们可以通过Stub类的asInterface方法获取目标
* 应用的aidl接口
*/
mIAppServiceInterface = IAppServiceInterface.Stub.asInterface(service);
Log.d("App2Activity2", "目标Service已连接");
}

@Override
public void onServiceDisconnected(ComponentName name) {
Log.d("App2Activity2", "目标Service已断开连接");

}
}

@Override
protected void onDestroy() {
super.onDestroy();
unbindService(conn);
mIAppServiceInterface = null;
}
}