Android多线程编程技术之使用IntentService

た入场券 2022-06-11 01:06 193阅读 0赞

**运行截图**  
![这里写图片描述][SouthEast]

![这里写图片描述][SouthEast 1]

可以看到，不仅MyIntentService 和MainActivity所在的线程id不一样，而且onDestory()方法的得到了执行，说明MyIntentService在运行完毕后确实自动停止了。集开启线程和自动停止线程于一身。

**MainActivity.java**

package lbstest.example.com.lbs.ServiceTest;
    
    import android.content.ComponentName;
    import android.content.Intent;
    import android.content.ServiceConnection;
    import android.os.Bundle;
    import android.os.IBinder;
    import android.support.v7.app.AppCompatActivity;
    import android.util.Log;
    import android.view.View;
    import android.widget.Button;
    
    import lbstest.example.com.lbs.R;
    
    public class Main3Activity extends AppCompatActivity implements View.OnClickListener {
        
    
        private MyService.DownloadBinder downloadBinder;
        //创建一个ServiceConnection匿名类
    
        private ServiceConnection connection = new ServiceConnection() {
            @Override
            public void onServiceConnected(ComponentName name, IBinder service) {
                downloadBinder = (MyService.DownloadBinder) service;
                downloadBinder.startDownload();
                downloadBinder.getProgress();
            }
    
            @Override
            public void onServiceDisconnected(ComponentName name) {
    
            }
        };
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main3);
            Button bindService = (Button) findViewById(R.id.bing_service);
            Button unbindService = (Button) findViewById(R.id.unbing_service);
            Button startService = (Button) findViewById(R.id.start_service);
            Button stopService = (Button) findViewById(R.id.stop_service);
            Button start_intent_service = (Button) findViewById(R.id.start_intent_service);
            start_intent_service.setOnClickListener(this);
            startService.setOnClickListener(this);
            stopService.setOnClickListener(this);
            bindService.setOnClickListener(this);
            unbindService.setOnClickListener(this);
        }
    
        @Override
        public void onClick(View v) {
            switch (v.getId()) {
                case R.id.bing_service:
                    Intent bindIntent = new Intent(this, MyService.class);
                    bindService(bindIntent, connection, BIND_AUTO_CREATE); //绑定服务
                    break;
                case R.id.unbing_service:
                    unbindService(connection); //解绑服务
                    break;
                case R.id.start_service:
                    Intent startIntent = new Intent(this, MyService.class);
                    startService(startIntent);//启动服务
                    break;
                case R.id.stop_service:
                    Intent stopIntent = new Intent(this,MyService.class);
                    stopService(stopIntent);//停止服务
                    break;
                case R.id.start_intent_service:
                    //打印主线程id
                    Log.d("MyIntentService","Thread is"+Thread.currentThread().getId());
                    Intent intentService = new Intent(this, MyIntentService.class);
                    startService(intentService);
                    break;
                default:
                    break;
            }
        }
    }

**MyIntentService.java**

package lbstest.example.com.lbs.ServiceTest;
    
    import android.app.IntentService;
    import android.content.Intent;
    import android.util.Log;
    import android.widget.Toast;
    
    /**
     * Created by bummer on 2017/7/26.
     */
    
    public class MyIntentService extends IntentService {
        
    
        /**
         * 首先要提供一个无参构造函数，在其内部调用其父类的有参构造函数
         */
        public MyIntentService() {
    
            super("MyIntentService"); //调用父类的有参构造函数
            //打印当前线程的id
        }
    
        /**
         * 在抽象的onHandleIntent()这个方法中可以去处理一些具体的逻辑，不用担心ANR问题，
         * 因为这个方法已经是在子线程中运行的了
         * @param intent
         */
        @Override
        protected void onHandleIntent( Intent intent) {
    
            //打印当前线程的id
            Log.d("MyIntentService","Thread is "+Thread.currentThread().getId());
        }
        public void onDestory(){
            super.onDestroy();
            Log.d("MyIntentService","onDestory executed");
            Toast.makeText(this,"Thread is is"+Thread.currentThread().getId(),Toast.LENGTH_SHORT).show();
        }
    }

**MyService.java**

package lbstest.example.com.lbs.ServiceTest;
    
    import android.app.Notification;
    import android.app.PendingIntent;
    import android.app.Service;
    import android.content.Intent;
    import android.graphics.BitmapFactory;
    import android.os.Binder;
    import android.os.IBinder;
    import android.support.v7.app.NotificationCompat;
    import android.util.Log;
    
    import lbstest.example.com.lbs.R;
    
    /**
     * Created by bummer on 2017/7/26.
     */
    
    public class MyService extends Service {
        
    
        private DownloadBinder mBinder = new DownloadBinder();
    
        @Override
        public void onCreate() {
            super.onCreate();
            Log.d("MyService","onCreate executed");
            Intent intent = new Intent(this,Main3Activity.class);
            PendingIntent pi = PendingIntent.getActivity(this,0,intent,0);
            Notification notification = new NotificationCompat.Builder(this)
                    .setContentTitle("This is content title")
                    .setContentText("This is content text")
                    .setWhen(System.currentTimeMillis())
                    .setSmallIcon(R.mipmap.ic_launcher)
                    .setLargeIcon(BitmapFactory.decodeResource(getResources(),R.mipmap.ic_launcher))
                    .setContentIntent(pi)
                    .build();
            startForeground(1,notification); //将MyService变成一个前台服务，并在系统状态栏显示出来
        }
    
        @Override
        public int onStartCommand(Intent intent, int flags, int startId) {
            Log.d("MyService", "onStartCommand executed");
            return super.onStartCommand(intent, flags, startId);
        }
    
        @Override
        public void onDestroy() {
            super.onDestroy();
            Log.d("MyService", "onDestroy executed");
        }
    
    
        @Override
        public IBinder onBind(Intent intent) {
            return null;
        }
    
        class DownloadBinder extends Binder {
            public void startDownload() {
                Log.d("Myservice", "startDownload executed");
            }
    
            public int getProgress() {
                Log.d("MyService", "getProgress");
                return 0;
            }
    
            public IBinder onBind(Intent intent) {
                return mBinder;
            }
    
        }
    
    
    }

**activity\_main.xml**

<?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:id="@+id/start_service"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="start_service" />
    
        <Button
            android:id="@+id/stop_service"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="stop_service" />
    
        <Button
            android:id="@+id/bing_service"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Bind Service" />
    
        <Button
            android:id="@+id/unbing_service"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Unbind Service" />
        <Button
            android:id="@+id/start_intent_service"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="start_intent_service" />
    
    </LinearLayout>

[SouthEast]: /images/20220611/9f8150dadb5746829c9148bf512414ef.png
[SouthEast 1]: /images/20220611/c0258f8a24ff43f6a036620582cef6fe.png