AIDL (Android Interface Definition Language)即Android接口定义语言。
最近在看Binder的原理，Android里面AIDL就是Binder的经典实现，先记录一下AIDL的使用步骤。
然后弹出一个让你修改文件名的页面，文件名自己随便取
点Finish以后aidl文件目录如下图：
然后打开aidl文件夹目录并打开刚刚创建的 OperateNumInterface.aidl 文件：
其中NumBean是自己新建的一个java类，目录如下
NumBean一定要实现 Parcelable接口，完整代码如下
package com.sz.aidl_service_demo;
import android.os.Parcel;
import android.os.Parcelable;
public class NumBean implements Parcelable {
private String extraInfo;
private int num1;
private int num2;
public NumBean(int num1, int num2, String extraInfo) {
this.num1 = num1;
this.num2 = num2;
this.extraInfo = extraInfo;
}
protected NumBean(Parcel parcel) {
num1 = parcel.readInt();
num2 = parcel.readInt();
extraInfo = parcel.readString();
}
public String getExtraInfo() {
return extraInfo;
}
public void setExtraInfo(String extraInfo) {
this.extraInfo = extraInfo;
}
public int getNum1() {
return num1;
}
public void setNum1(int num1) {
this.num1 = num1;
}
public int getNum2() {
return num2;
}
public void setNum2(int num2) {
this.num2 = num2;
}
public static final
Creator<NumBean> CREATOR = new Creator<NumBean>() {
@Override
public NumBean createFromParcel(Parcel source) {
return new NumBean(source);
}
@Override
public NumBean[] newArray(int size) {
return new NumBean[size];
}
};
@Override
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeInt(num1);
dest.writeInt(num2);
dest.writeString(extraInfo);
}
}
然后在aidl文件夹下创建NumBean.adil文件，内容如图
这时候你需要rebulid一下项目，用来生成OperateNumInterface.java文件，build成功以后会有如下目录：
创建一个类实现Service，位置目录如下
OperateNumService.java详细代码:
package com.sz.aidl_service_demo;
import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.os.RemoteException;
import android.util.Log;
import androidx.annotation.Nullable;
public class OperateNumService extends Service {
注释1：一定要先ReBuild项目，否则找不到OperateNumInterface
private IBinder iBinder = new OperateNumInterface.Stub() {
@Override
public int operateNum(NumBean numBean) throws RemoteException {
注释2：还记得aidl文件中我们自己定义的方法么，具体实现在这里
Log.i("tag", "num1=" + numBean.getNum1() + ",num2=" + numBean.getNum2() + ",ExtraInfo=" + numBean.getExtraInfo());
return numBean.getNum1() + numBean.getNum2();//我是将NumBean中两个数的和返回
}
};
@Nullable
@Override
public IBinder onBind(Intent intent) {
return iBinder;
}
}
然后别忘了在Mainfest文件中声明Service:
<service android:name=".OperateNumService">
<intent-filter>
<action android:name="com.aidl_service_demo.my_flag" />
</intent-filter>
</service>
到这里服务端就写好了。
注意，NumBean类的目录要和Service端的目录结构一样
注意，你需要ReBuild项目一下
这些操作都是在MainActivity 中进行，代码如下：
import androidx.appcompat.app.AppCompatActivity;
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.RemoteException;
import android.util.Log;
import android.view.View;
import android.widget.TextView;
import com.sz.aidl_service_demo.NumBean;
import com.sz.aidl_service_demo.OperateNumInterface;
public class MainActivity extends AppCompatActivity {
private TextView tv_operate_num_result;
private int operateResult = -1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tv_operate_num_result = findViewById(R.id.tv_operate_num_result);
}
注释1：按钮1 绑定Service
public void bindService(View view) {
Intent intentBind = new Intent();
intentBind.setAction("com.aidl_service_demo.my_flag");
intentBind.setPackage("com.sz.aidl_service_demo");
bindService(intentBind, serviceConnection, Context.BIND_AUTO_CREATE);
}
注释2：按钮2 向Service发送数据并接收返回数据展示
public void sendService(View view) {
NumBean numBean = new NumBean(160, 8, "i'm extra info");
if (operateNumInterface != null) {
try {
operateResult = operateNumInterface.operateNum(numBean);
} catch (RemoteException e) {
e.printStackTrace();
}
}
tv_operate_num_result.setText("Service 返回操作结果为: " + operateResult);
}
private OperateNumInterface operateNumInterface;
private ServiceConnection serviceConnection = new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
Log.i("tag", "onServiceConnected");
注释3：
operateNumInterface = OperateNumInterface.Stub.asInterface(service);
}
@Override
public void onServiceDisconnected(ComponentName name) {
operateNumInterface = null;
}
};
}
1 先点击绑定Service按钮，此时客户端打印日志如下：
2 再点击 发送数据到Service 按钮
Service端日志如下：
Client端界面展示如下：
