标签：roc 打印 begin access oid connect 学什么 dem roi
对于AIDL有一些人的浅显概念就是，AIDL能够跨进程訪问其它应用程序，和其它应用程序通讯，那我告诉你。非常多技术都能够訪问，如广播（应用A在AndroidManifest.xml中注冊指定Action的广播）应用B发送指定Action的广播，A就能收到信息，这样也能看成不同应用之间完毕了通讯（可是这样的通讯是单向的）。还如ContentProvider，通过URI接口暴露数据给其它应用訪问；可是这样的都算不上是应用之间的通讯。
可能最让人迷惑的是Android推出来了Messager,它就是完毕应用之间的通讯的。那么为什么还要有AIDL呢。官方文档介绍AIDL中有这么一句话：
Note: Using AIDL is necessary only if you allow clients from different applications to access your service for IPC and want to handle multithreading in your service. If you do not need to perform concurrent IPC across different applications, you should create your interface by implementing a Binder or, if you want to perform IPC, but do not need to handle multithreading, implement your interface using a Messenger. Regardless, be sure that you understand Bound Services before implementing an AIDL.第一句最重要，“仅仅有当你同意来自不同的client訪问你的服务而且须要处理多线程问题时你才必须使用AIDL”。其它情况下你都能够选择其它方法。如使用Messager，也能跨进程通讯。
可见AIDL是处理多线程、多client并发訪问的。而Messager是单线程处理。还是官方文档说的明确，一句话就能够理解为什么要有AIDL。那么是不是这样的写个AIDL试试。
// IRemoteService.aidl
package com.example.android;
// Declare any non-default types here with import statements
/** Example service interface */
interface IRemoteService {
/** Request the process ID of this service, to do evil things with it. */
int getPid();
/** 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);
}
这段代码也是官方文档的。命名为IRemoteService.aidl。放在com.example.android包下（这个能够任意），保存后Android编译器会在gen文件夹下自己主动生成IRemoteService.java文件
package com.example.service;
import com.example.android.IRemoteService;
import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.os.Process;
public class DDService extends Service {
@Override
public void onCreate() {
super.onCreate();
System.out.println("DDService onCreate........" + "Thread: " + Thread.currentThread().getName());
}
@Override
public IBinder onBind(Intent arg0) {
System.out.println("DDService onBind");
return mBinder;
}
private final IRemoteService.Stub mBinder = new IRemoteService.Stub() {
public int getPid(){
System.out.println("Thread: " + Thread.currentThread().getName());
System.out.println("DDService getPid ");
return Process.myPid();
}
public void basicTypes(int anInt, long aLong, boolean aBoolean,
float aFloat, double aDouble, String aString) {
System.out.println("Thread: " + Thread.currentThread().getName());
System.out.println("basicTypes aDouble: " + aDouble +" anInt: " + anInt+" aBoolean " + aBoolean+" aString " + aString);
}
};
}
package com.example.aidlclient;
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.Process;
import android.os.RemoteException;
import android.view.View;
import com.example.android.IRemoteService;
public class MainActivity extends Activity {
private IRemoteService remoteService;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
ServiceConnection conn = new ServiceConnection() {
@Override
public void onServiceDisconnected(ComponentName name) {
}
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
remoteService = IRemoteService.Stub.asInterface(service);
try {
int pid = remoteService.getPid();
int currentPid = Process.myPid();
System.out.println("currentPID: " + currentPid +" remotePID: " + pid);
remoteService.basicTypes(12, 1223, true, 12.2f, 12.3, "我们的爱，我明确");
} catch (RemoteException e) {
e.printStackTrace();
}
System.out.println("bind success! " + remoteService.toString());
}
};
/**
* 监听按钮点击
* @param view
*/
public void buttonClick(View view) {
System.out.println("begin bindService");
Intent intent = new Intent("duanqing.test.aidl");
bindService(intent, conn, Context.BIND_AUTO_CREATE);
}
@Override
protected void onDestroy() {
super.onDestroy();
unbindService(conn);
}
}
4、运行
标签：roc 打印 begin access oid connect 学什么 dem roi
原文地址：http://www.cnblogs.com/tlnshuju/p/6791204.html
