Android四大主件之服务Service_安卓serive.rar-优快云博客

本文介绍了Android中服务和IntentService的使用方法，包括服务的启动、停止、耗时操作的处理，以及如何通过Intent传递数据。通过示例代码演示了如何创建、注册和取消接收服务，以及IntentService如何在后台异步执行任务。

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概述：

服务是需要注册的，它会在系统后台运行，即使是停止一个活动，服务仍会运行 另外，活动不宜进行耗时的操作，耗时操作应该放在一个单独的线程里。
启动服务要用到Intent。

代码：

public class TestServiceActivity extends Activity implements View.OnClickListener{

    private Button mButtonStartService;
    private Button mButtonStopService;
    private Button mButtonStartDownload;
    public static final String DOWNLOAD_SERVICE = "com.download.test";

    private ProgressBar mProgressBar;

    private MyReceiver mReceiver;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.layout_service);

        mButtonStartService = (Button) findViewById(R.id.button_start_service);
        mButtonStopService = (Button) findViewById(R.id.button_stop_service);
        mButtonStartDownload = (Button) findViewById(R.id.button_start_download);

        mProgressBar = (ProgressBar) findViewById(R.id.progress_bar);

        mReceiver = new MyReceiver();
        IntentFilter filter = new IntentFilter();
        filter.addAction(DOWNLOAD_SERVICE);
        registerReceiver(mReceiver,filter);

        mButtonStopService.setOnClickListener(this);
        mButtonStartService.setOnClickListener(this);
        mButtonStartDownload.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()){
            case R.id.button_start_service:
                Intent intent = new Intent(getApplicationContext(), MyReceiver.class);
                startService(intent);
                break;
            case R.id.button_stop_service:
                Intent intent1 = new Intent(getApplicationContext(), MyService.class);
                stopService(intent1);
                break;
            case R.id.button_start_download:
                Intent intent2 = new Intent(DOWNLOAD_SERVICE);
                startService(intent2);
                break;
            default:
                break;
        }
    }

    class MyReceiver extends BroadcastReceiver{

        @Override
        public void onReceive(Context context, Intent intent) {
            int count = intent.getIntExtra("count",0);
            mProgressBar.setProgress(count);
        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        unregisterReceiver(mReceiver);
    }
}

Service与IntentService

public class MyService extends Service {

    @Override
    public void onCreate() {
        super.onCreate();
        Log.d("service","onCreate");
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Log.d("service", "onStartCommand");
        new Thread(new Runnable() {
            int count = 0;
            @Override
            public void run() {
                while (count<100){
                    count++;
                    Intent intent = new Intent();
                    //intent.setAction(TestServiceActivity.DOWNLOAD_SERVICE);
                    intent.putExtra("count",count);
                    sendBroadcast(intent);
                    try {
                        Thread.sleep(200);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
        }).start();
        return super.onStartCommand(intent, flags, startId);
    }

    @Override
    public void onDestroy() {
        Log.d("service","onDestroy");
        super.onDestroy();
    }

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }
}

public class MyIntentService extends IntentService {
    int count = 0;
    /**
     * Creates an IntentService.  Invoked by your subclass's constructor.
     *
     * @param name Used to name the worker thread, important only for debugging.
     */
    public MyIntentService(String name) {
        super(name);
    }
    //必须这么写，不然不能在manifests里面注册
    public MyIntentService() {
        super(null);
    }

    @Override
    protected void onHandleIntent(Intent intent) {

        while (count<100){
            count++;
            Intent intent1 = new Intent();
            intent.setAction(TestServiceActivity.DOWNLOAD_SERVICE);
            intent.putExtra("count",count);
            sendBroadcast(intent1);
            try {
                Thread.sleep(200);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}

布局：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:orientation="vertical"
              android:layout_width="match_parent"
              android:layout_height="match_parent">
    <Button
        android:id="@+id/button_start_service"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:visibility="gone"
        android:text="Start Service"/>
    <Button
        android:id="@+id/button_stop_service"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Stop Service"/>

    <ProgressBar
        android:id="@+id/progress_bar"
        android:layout_width="match_parent"
        style="?android:attr/progressBarStyleHorizontal"
        android:layout_height="10dp"
        android:layout_margin="10dp"/>
    <Button
        android:id="@+id/button_start_download"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Start Download"/>
</LinearLayout>