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深入Android架构(从线程到AIDL)_24 活用IBinder接口于近程通信02

article 2025/1/13 0:13:11

3、留意线程的角色

在上述的范例程序，都是由主线程所执行的。由主线程执行所有的调用。如下图：

也可以创建小线程执行对IS接口的调用

例如将上述onClick()函数内容改写为：

public void onClick(View v) {
    th1 = new Thread(this);
    th1.start();
}

public void run() {
    //……. isv.f1()
}

就诞生小线程去调用IS接口了，如下图：

程序代码

// ILoad.java
// ………
interface ILoad {
    boolean loadImage();
    boolean cancel();
}

// myService.java
// ………
public class myService extends Service implements ILoad{
    private final IBinder mBinder;
    @Override public IBinder onBind(Intent intent) {
        return mBinder;
    }

    @Override public void onCreate(){
        super.onCreate();
        mBinder = new myBinder();
    }

    public class myBinder extends Binder{
        ILoad getService(){
            return myService.this;
        }
    }

    @Override public boolean loadImage() {
        // loading image from cloud
    }

    @Override public boolean cancel() {
        // cancel loading
    }
}


// myActivity.java
// ……….
public class myActivity extends Activity implements OnClickListener {
    ILoad isv;
    Thread th1;
    // ……..
    @Override public void onCreate(Bundle savedInstanceState) {
        // ………
        Intent intent = new Intent(this,myService.class);
        bindService(intent, mConnection,Context.BIND_AUTO_CREATE);
    }

    private ServiceConnection mConnection = new ServiceConnection(){
        @Override public void onServiceConnected(ComponentName className, IBinder ibinder) {
            myBinder ib = (myBinder)ibinder;
            isv = ib.getService();
        }

        @Override public void onServiceDisconnected(
            ComponentName arg0) { }
    };

    @Override public void onClick(View v) {
        switch( v.getId() ){
            case 101:
                th1 = new Thread(this);
                th1.start();
                break;
            case 102:
                isv.cancel();
                break;
            default:
                break;
        }
    }

    public void run() {
        isv.loadImage();
    }
}