Android 回调函数的使用 callBack 回调函数体执行所在线程_andorid 回调函数

回调

public interface AListener {
    void onComplete(String a);
}

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封装回调函数

public class UseCB {
    private AListener listener;

    private String TAG = "JJWorld.DoMethodA";

    public UseCB(AListener listener){
        this.listener = listener;
    }

    public void callCB(){
        Log.i(TAG,"somethingForCallBack 调用线程信息:" + Thread.currentThread().getId() + " " + Thread.currentThread().getName());
        listener.onComplete("当前线程为" + Thread.currentThread().getId() + " " + Thread.currentThread().getName());
    }
}
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测试主程序

public class MainActivity extends AppCompatActivity {

    private ThreadPoolExecutor threadPoolExecutor;
    private static final String TAG = "JJWorld.MainActivity";
    private UseCB thirdTest;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Log.i(TAG,"调用线程信息:" + Thread.currentThread().getId() + " " + Thread.currentThread().getName());

        UseCB useCB = new UseCB(new AListener() {
            @Override
            public void onComplete(String result) {
                Log.i(TAG,"doMethodA 当前线程信息:" + Thread.currentThread().getId() + " " + Thread.currentThread().getName());
                Log.e(TAG, "result: " + result);
            }
        });

        useCB.callCB();

        new Thread(new Runnable() {
            @Override
            public void run() {
                Log.i(TAG,"secondTest 调用线程信息:" + Thread.currentThread().getId() + " " + Thread.currentThread().getName());
                useCB.callCB();
            }
        },"Second Thread").start();
    }
}
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结果

回调函数内部程序执行时所在线程为调用的线程，即调用listener.onComplete的线程。

输出日志

2023-05-19 10:55:28.719 3274-3274/cn.jj.callback I/JJWorld.MainActivity: 调用线程信息:2 main
2023-05-19 10:55:28.719 3274-3274/cn.jj.callback I/JJWorld.DoMethodA: somethingForCallBack 调用线程信息:2 main
2023-05-19 10:55:28.719 3274-3274/cn.jj.callback I/JJWorld.MainActivity: doMethodA 当前线程信息:2 main
2023-05-19 10:55:28.719 3274-3274/cn.jj.callback E/JJWorld.MainActivity: result: 当前线程为2 main
2023-05-19 10:55:28.719 3274-3715/cn.jj.callback I/JJWorld.MainActivity: secondTest 调用线程信息:34278 Second Thread
2023-05-19 10:55:28.719 3274-3715/cn.jj.callback I/JJWorld.DoMethodA: somethingForCallBack 调用线程信息:34278 Second Thread
2023-05-19 10:55:28.719 3274-3715/cn.jj.callback I/JJWorld.MainActivity: doMethodA 当前线程信息:34278 Second Thread
2023-05-19 10:55:28.719 3274-3715/cn.jj.callback E/JJWorld.MainActivity: result: 当前线程为34278 Second Thread

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回调函数十张图

介绍了回调函数的执行线程问题。回调函数在回调函数执行的线程里执行回调具体函数。
https://blog.csdn.net/itcodexy/article/details/111027346