Android AIDL实现与服务相互调用方式

编辑: admin 分类: 安卓教程 发布时间: 2022-03-14 来源:互联网

通过AIDL接口在进程间传递数据,记录在开发中遇到的一写问题

AIDL支持数据类型如下:

1. Java 的原生类型

2. String 和CharSequence

3. List 和 Map ,List和Map 对象的元素必须是AIDL支持的数据类型; 以上三种类型都不需要导入(import)

4. AIDL 自动生成的接口 需要导入(import)

5. 实现android.os.Parcelable 接口的类. 需要导入(import)。

问题1 在传递非基础数据时 在参数前需加修饰符

 void getDatas(in byte[] bs);

 void DataWhole(in PackageData data);
}

这里重点是in、out、inout修饰符以及Parcelable的使用!常见的是in、Parcelable,少用的out、inout。

这几种修饰符,可理解如下:

in:客户端的参数输入;

out:服务端的参数输入;

inout:这个可以叫输入输出参数,客户端可输入、服务端也可输入。客户端输入了参数到服务端后,服务端也可对该参数进行修改等,最后在客户端上得到的是服务端输出的参数。

问题2 传递对象时的必要操作

1.必需实现Parcelable接口,内部类必需为静态内部类

2.需在aidl目录创建同类名的AIDL文件,并声明Parcelable,如图

AIDL文件代码就两行

问题3 参数大小的限制

如上在传递byte[] 长度大于1024*1024时会抛出 TransactionTooLargeException 异常

问题4 实现与服务之间互相调用

1.在绑定服务时会返回一个实现了AIDL的对象,这样可以通过对象调用服务中对应实现,

2.可以在应用层实现一个AIDL接口的对象,通过绑定服务返回的AIDL对象回传给服务,这样可以在服务中主动调用应用层的方法实现数据回传通知,

//接收回调
INotification notification = new INotification.Stub() {
 @Override
 public void Datas(byte[] bs) throws RemoteException {
 Log.d(TAG, "Datas: 收到数据=" + Arrays.toString(bs));//已测试 最大数据1024*1024
 }
 }
 
 //传递回调对象
void setNotification(in INotification Notification);
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
 iAidlInterface = IAidlInterface.Stub.asInterface(service);
 try {
 iAidlInterface.setNotification(notification);
 } catch (RemoteException e) {
 e.printStackTrace();
 }
}

补充知识:在Android系统中实现AIDL功能

之前实现AIDL的功能都是通过eclipse或者android studio工具实现,最近由于项目需要,需要系统层提供接口给应用层使用,所以想到使用AIDL。下面已一个非常简单的Demo来说明在Android系统平台生成AIDL的jar供应用层使用。

一、AIDL的jar制作

首先新建一个android项目来用生产aidl的jar包,项目结构如下:

gunder@gunder:/mnt/hgfs/ubuntuShare/aidl/SimpleJar$ tree
.
├── Android.mk
└── src
 └── com
 └── china
  └── jar
  ├── IVoiceClientInterface.aidl
  └── VoiceManager.java

只有三个文件,首先看一下IVoiceClientInterface.aidl文件:

package com.china.jar;
 
interface IVoiceClientInterface{
 void face();
}

里面只有一个简单的方法face。 IVoiceClientInterface.aidl主要是服务器端来实现的,而VoiceManager.java是供客户端调用face方法使用的。VoiceManager.java具体实现如下:

package com.china.jar;
 
import com.china.jar.IVoiceClientInterface;
 
import android.os.Handler;
import android.os.HandlerThread;
import android.os.Message;
import android.os.RemoteException;
import android.util.Log;
import android.os.ServiceManager;
 
public class VoiceManager {
	private static final String TAG = "VoiceManager";
	private static VoiceManager mVoiceManager;
	private static IVoiceClientInterface mService = null;
	public static final String NAME = "simple_jar";
	public static final boolean DEBUG_DATA = true;
	
	private final HandlerThread mWorkThread;
	private final Handler mWorkHander;
	private static final int MSG_INIT_SERVICE = 0x01;
	
	//单例模式
	public static synchronized VoiceManager getInstance(){
		if (null == mVoiceManager){
			synchronized (VoiceManager.class) {
				if (null == mVoiceManager){
					mVoiceManager = new VoiceManager();
				}
			}
		}
		return mVoiceManager;
	}
	
	private VoiceManager(){
		mWorkThread = new HandlerThread("simple_manager");
		mWorkThread.start();
		mWorkHander = new Handler(mWorkThread.getLooper()){
			@Override
			public void handleMessage(Message msg) {
				switch (msg.what) {
				case MSG_INIT_SERVICE:
					removeMessages(MSG_INIT_SERVICE);
					
					break;
 
				default:
					break;
				}
			}
		};
	}
	//获取服务端注册的NAME服务并跟服务端建立连接
	private synchronized IVoiceClientInterface getService(){
		if (null == mService){
			Log.e(TAG, "IVocieService init");
			mService = IVoiceClientInterface.Stub.asInterface(ServiceManager
   .getService(NAME));
		}
		
		if (null == mService){
			Log.e(TAG, "jar service is null");
			mWorkHander.removeMessages(MSG_INIT_SERVICE);
			mWorkHander.sendEmptyMessageDelayed(MSG_INIT_SERVICE, 100);
		}
		return mService;
	}
	
 //调用服务端的face方法,实现两个不同app之间的进程间通信
	public void face(){
		Log.d(TAG, "face");
		mService = getService();
		if (null == mService){
			Log.e(TAG, "face mService is null!");
			return ;
		}
		try{
			mService.face();
		}catch(RemoteException e){
			e.printStackTrace();
		}
	}
}

Android.mk文件主要是用来将IVoiceClientInterface.aidl和VoiceManager.java编译成jar包,以方便在eclipse或者Android Studio中使用。

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
 
LOCAL_SRC_FILES := $(call all-java-files-under, src)
LOCAL_JAVA_LIBRARIES := simple
LOCAL_PACKAGE_NAME := SimpleService
LOCAL_CERTIFICATE :=platform
include $(BUILD_PACKAGE)

将该项目放置到android系统的packages/apps目录单编就可以生产out/target/common/obj/JAVA_LIBRARIES/SimpleJar_intermediates/classes.jar,classes.jar就可以导入eclipse或者Android Studio中使用。

二、服务端实现AIDL中的接口demo目录结构如下:

gunder@gunder:/mnt/hgfs/ubuntuShare/aidl/SimpleJarService$ tree
.
├── AndroidManifest.xml
├── Android.mk
├── libs
│ └── simple.jar
├── res
│ ├── drawable-hdpi
│ │ └── ic_launcher.png
│ ├── drawable-ldpi
│ ├── drawable-mdpi
│ │ └── ic_launcher.png
│ ├── drawable-xhdpi
│ │ └── ic_launcher.png
│ ├── layout
│ ├── values
│ │ ├── strings.xml
│ │ └── styles.xml
│ ├── values-v11
│ │ └── styles.xml
│ └── values-v14
│ └── styles.xml
└── src
└── com
└── china
└── service
├── BootReceiverBroadcast.java
├── Logger.java
└── SimpleService.java

主要实现只有5个文件:SimpleService.java、Logger.java、BootReceiverBroadcast.java、 Android.mk、 AndroidManifest.xml。SimpleService.java是实现AIDL的服务,具体实现如下:

package com.china.service;
 
import com.china.jar.IVoiceClientInterface;
import com.china.jar.VoiceManager;
 
import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.os.RemoteException;
import android.os.ServiceManager;
 
public class SimpleService extends Service{
	private static VoiceClientInterfaceImpl mBinder;
	@Override
	public IBinder onBind(Intent intent) {
		Logger.d();
		return mBinder;//跟客户端绑定
	}
	
	@Override
	public void onCreate() {
		super.onCreate();
		Logger.d();
		if (null == mBinder){
			initService();
		}
	}
	
	@Override
	public int onStartCommand(Intent intent, int flags, int startId) {
		Logger.d();
		if (null == mBinder){
			initService();
		}
		return START_STICKY;
	}
	//实现AIDL的接口
	private class VoiceClientInterfaceImpl extends IVoiceClientInterface.Stub{
		@Override
		public void face() throws RemoteException {
			Logger.d("face----excute!");//客户端调用face方法时这里会执行,会打印face----excute!
		}
	}
	//初始化服务,主要是向系统注册服务
	private void initService(){
		Logger.d();
		if (null == mBinder){
			synchronized (SimpleService.class) {
				if (null == mBinder){
					try {
						mBinder = new VoiceClientInterfaceImpl();
						ServiceManager.addService(VoiceManager.NAME, mBinder);
					} catch (Exception e) {
						e.printStackTrace();
					}
				}
			}
		}
	}
}

Logger.java是打印Log的简单封装,具体如下:

package com.china.service;
 
import android.util.Log;
 
import java.util.Locale;
 
public class Logger {
 public static final boolean DEBUG = true;
 public static final String DEFAULT_TAG = "AIOS_";
 
 public Logger(){}
 public static void d(){
 if (DEBUG){
  Log.d(DEFAULT_TAG,getPrefix());
 }
 }
 
 public static void d(String msg){
 if (DEBUG){
  Log.d(DEFAULT_TAG, getPrefix() + msg);
 }
 }
 
 public static void d(String msg, Throwable tr){
 if (DEBUG){
  Log.d(DEFAULT_TAG, getPrefix() + msg, tr);
 }
 }
 
 
 private static String getPrefix(){
 StackTraceElement stackTraceElement = Thread.currentThread().getStackTrace()[4];
 String className = stackTraceElement.getClassName();
 int classNameStartIndex = className.lastIndexOf(".") + 1;
 className = className.substring(classNameStartIndex);
 String methodName = stackTraceElement.getMethodName();
 int methodLine = stackTraceElement.getLineNumber();
 String format = "%s_%s(L:%d)";
 return String.format(Locale.CANADA, format, className, methodName, methodLine);
 }
 
}

BootReceiverBroadcast.java是开机完成的时候拉起 SimpleService服务,具体实现如下:

package com.china.service;
 
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
 
public class BootReceiverBroadcast extends BroadcastReceiver{
 @Override
 public void onReceive(Context context, Intent intent) {
 Logger.d();
 Intent service = new Intent(context, SimpleService.class);//开机启动会拉起服务SimpleService
 context.startService(service);
 }
}

Android.mk具体实现如下:

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
 
LOCAL_SRC_FILES := $(call all-java-files-under, src)
LOCAL_PACKAGE_NAME := SimpleService
LOCAL_CERTIFICATE :=platform
LOCAL_PRIVILEGED_MODULE := false
LOCAL_DEX_PREOPT := false
LOCAL_STATIC_JAVA_LIBRARIES := simple
include $(BUILD_PACKAGE)
include $(CLEAR_VARS)
LOCAL_MODULE_TAGS := optional 
LOCAL_PREBUILT_STATIC_JAVA_LIBRARIES :=simple:libs/simple.jar 
include $(BUILD_MULTI_PREBUILT)
include $(call all-makefiles-under,$(LOCAL_PATH))

这里的simple.jar是第一步中制作的classes.jar。 AndroidManifest.xml配置文件如下:

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
 package="com.chinatsp.service"
 android:versionCode="1"
 android:versionName="1.0"
 android:sharedUserId="android.uid.system"
 >
 
 <uses-sdk
 android:minSdkVersion="8"
 android:targetSdkVersion="21" />
 <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>
 <application
 android:allowBackup="true"
 android:icon="@drawable/ic_launcher"
 android:label="@string/app_name"
 android:theme="@style/AppTheme" >
 <service android:name="com.china.service.SimpleService"></service>
 <receiver android:name="com.china.service.BootReceiverBroadcast">
  <intent-filter>
  <action android:name="android.intent.action.BOOT_COMPLETED"/>
  <!-- <category android:name="android.intent.category.LAUNCHER"/> -->
  </intent-filter>
 </receiver>
 </application>
 
</manifest>

到这里服务端就实现完了。

三、客户端实现AIDL的接口调用demo目录结构如下:

gunder@gunder:/mnt/hgfs/ubuntuShare/aidl/SimpleJarClient$ tree
.
├── AndroidManifest.xml
├── Android.mk
├── libs
│ └── simple.jar
├── res
│ ├── drawable-hdpi
│ │ └── ic_launcher.png
│ ├── drawable-ldpi
│ ├── drawable-mdpi
│ │ └── ic_launcher.png
│ ├── drawable-xhdpi
│ │ └── ic_launcher.png
│ ├── drawable-xxhdpi
│ │ └── ic_launcher.png
│ ├── layout
│ │ ├── activity_main.xml
│ │ ├── activity_tss.xml
│ │ └── test.xml
│ ├── menu
│ ├── values
│ │ ├── dimens.xml
│ │ └── strings.xml
│ ├── values-v11
│ ├── values-v14
│ └── values-w820dp
│ └── dimens.xml
└── src
└── com
└── example
└── helloworld
├── TestVoice.java
└── util
└── Logger.java

这里主要看5个文件:Logger.java、 test.xml、TestVoice.java、Android.mk、AndroidManifest.xml,其中Logger.java跟服务端代码一样的。TestVoice.java的实现也很简单,在button调用face方法,具体实现如下:

package com.example.helloworld;
 
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
 
import com.example.helloworld.util.Logger;
 
 
public class TestVoice extends Activity{
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.test);
 }
 
 public void startVoice(View view){
 Logger.d();
 }
 
 public void stopVoice(View view){
 Logger.d();
 com.china.jar.VoiceManager.getInstance().face();
 }
 
 public void finishVoice(View view){
 Logger.d();
 finish();
 }
 
 
 
}

test.xml布局如下:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:orientation="vertical" >
 
 <Button 
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:onClick="startVoice"
 android:text="@string/tts_start"/>
 
 <Button 
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:onClick="stopVoice"
 android:text="@string/tts_stop"/>
 
 <Button 
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:onClick="finishVoice"
 android:text="@string/tts_finish"/>
 
</LinearLayout>

Android.mk实现如下:

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_SRC_FILES := $(call all-java-files-under, src)
LOCAL_STATIC_JAVA_LIBRARIES := simple
LOCAL_PREBUILT_STATIC_JAVA_LIBRARIES := simple.jar 
#LOCAL_MODULE_TAGS :=optional
LOCAL_PACKAGE_NAME := Hello
#LOCAL_CERTIFICATE :=platform
#LOCAL_PRIVILEGED_MODULE := false
#LOCAL_DEX_PREOPT := false
include $(BUILD_PACKAGE)


AndroidManifest.xml实现如下:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
 package="com.example.helloworld"
 android:versionCode="1"
 android:versionName="1.0" >
 <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>
 <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
 <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
 <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
 <uses-permission android:name="android.permission.INTERNET" />
 <uses-permission android:name="android.permission.BLUETOOTH" />
 <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
 <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
 <uses-permission android:name="android.permission.WRITE_SETTINGS"/>
 
 <uses-sdk
 android:minSdkVersion="8"
 android:targetSdkVersion="21" />
 
 <application
 android:allowBackup="true"
 android:icon="@drawable/ic_launcher"
 android:label="@string/app_name"
 >
 <activity
  android:name="com.example.helloworld.TestVoice"
  android:label="@string/app_name" >
  <intent-filter>
  <action android:name="android.intent.action.MAIN" />
 
  <category android:name="android.intent.category.LAUNCHER" />
  </intent-filter>
 </activity>
 </application>
 
</manifest>

到这里客户端也实现了。将服务端跟客户端的apk安装到系统就可以测试了。

测试结果打印如下:

以上这篇Android AIDL实现与服务相互调用方式就是小编分享给大家的全部内容了,希望能给大家一个参考,也希望大家多多支持海外IDC网。

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