用AIDL 实现service 主动发送消息给activity

来源：互联网发布：数控火焰切割编程代码编辑：程序博客网时间：2024/05/22 08:23

题目详情

1、实现一个activity和一个service，它们在不同的进程
2、service每隔3－5秒钟产生10条数据（10个数字，每个数字随即为1－100），然后发送给activity
3、并且activity用listview显示这些数据

思路

实现两个aidl接口，一个用于通知service产生数据，一个用于 service 通知activity更新数据

效果图

这里写图片描述

代码

两个aidl文件如下：

IGetData.aidl

import com.qunar.yuzhiyun.IClientCallBack;interface IGetData {    void register(IClientCallBack callback);    void startCreateData();}

IClientCallBack.aidl

interface IClientCallBack {    void update(in List<String> arrayList);}

DataSourceService.java

public class DataSourceService extends Service {    volatile boolean needToRun;    public DataSourceService() {    }    @Override    public IBinder onBind(Intent intent) {        return  binder;    }    @Override    public boolean onUnbind(Intent intent) {        needToRun=false;        return super.onUnbind(intent);    }    IGetData.Stub binder=new IGetData.Stub() {        IClientCallBack callBack;        @Override        public void register(IClientCallBack callback) throws RemoteException {            this.callBack=callback;        }        @Override        public void startCreateData() throws RemoteException {            needToRun=true;            final ArrayList<String> arrayList=new ArrayList<>();            Thread thread=new Thread(new Runnable() {                @Override                public void run() {                    int interval;                    while (needToRun){                        arrayList.clear();                        interval=3+  (int)(Math.random()*3);                        Log.i("time",""+interval);                        try {                            Thread.sleep(interval*1000);                        } catch (InterruptedException e) {                            e.printStackTrace();                        }                        for(int i=0;i<10;i++){                            Random random=new Random();                            arrayList.add((int)(random.nextInt(100))+"");                        }                        if (callBack!=null)                            try {                                //数据推送到客户端（Activity）                                callBack.update(arrayList);                            } catch (RemoteException e) {                                e.printStackTrace();                            }                    }                }            });            thread.start();        }    };}

MainActivity.java

public class MainActivity extends AppCompatActivity {    ListView lvNumber;    IGetData iGetData;    ArrayAdapter<String> adapter;    ArrayList<String> stringList;    Intent intent;    ServiceConnection connection=new ServiceConnection() {        @Override        public void onServiceConnected(ComponentName name, IBinder service) {            iGetData=IGetData.Stub.asInterface(service);            try {                iGetData.register(new IClientCallBack.Stub(){                    @Override                    public void update(List<String> arrayList) throws RemoteException {                        Message message=new Message();                        message.obj=arrayList;                        handler.sendMessage(message);                    }                });                iGetData.startCreateData();            } catch (RemoteException e) {                e.printStackTrace();            }        }        @Override        public void onServiceDisconnected(ComponentName name) {        }    };    Handler handler=new  UpDataHandler(MainActivity.this);    static class UpDataHandler extends Handler{        WeakReference<Activity> weakReference;        UpDataHandler(Activity activity){            weakReference=new WeakReference<Activity>(activity);        }        @Override        public void handleMessage(Message msg) {            super.handleMessage(msg);            MainActivity activity= (MainActivity) weakReference.get();            if(activity!=null) {                activity.stringList.clear();                activity.stringList.addAll((ArrayList<String>) msg.obj);                activity.adapter.notifyDataSetChanged();            }        }    }    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        lvNumber= (ListView) findViewById(R.id.lvNumber);        stringList=new ArrayList<>();        stringList.add("1");        stringList.add("2");        stringList.add("3");        adapter=new ArrayAdapter<String>(this,R.layout.support_simple_spinner_dropdown_item,stringList);        lvNumber.setAdapter(adapter);        intent=new Intent(MainActivity.this,DataSourceService.class);        bindService(intent,connection, Context.BIND_AUTO_CREATE);    }    @Override    protected void onPause() {        super.onPause();        unbindService(connection);        stopService(intent);    }}

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