Android 模仿RxAndroid实现监听

一、概述:
这里使用简单的除法运算来演示

1、创建FirstActivity

public class FirstActivity extends AppCompatActivity implements CacuService.OnCacuListener {
    private static final String TAG = FirstActivity.class.getSimpleName() ;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_down);
        ButterKnife.inject(this);
    }

   @OnClick(R.id.btn_cacu)
   public void cacu(View view){
        new CacuService().divide(3,4,this);
   }

    @Override
    public void onError(String str) {
        Log.i("tag", str);
    }

    @Override
    public void onSuccess(float result) {
        Log.i("tag", result + "");
    }

}

2、创建控制层CacuService

public class CacuService {

    public interface OnCacuListener{
        void onError(String str);
        void onSuccess(float result);
    }

    public void divide(int a, int b, OnCacuListener listener){
        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    SystemClock.sleep(2000);
                    float result = a / b;
                    if (listener != null){
                        listener.onSuccess(result);
                    }
                } catch (Exception e) {
                    //e.printStackTrace();
                    if (listener != null){
                        listener.onError(e.getMessage());
                    }
                }
            }
        }).start();
    }

}