如何在 Android 中注册多个监听器？

Question

在 iOS 中，我可以注册多个 target+action 事件处理程序，例如像这样的按钮：

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(20, 40, 300, 40)];
    [button setBackgroundColor:[UIColor blueColor]];
    [button setTitle:@"Click Me!" forState:UIControlStateNormal];
    [button addTarget:self action:@selector(handler1) forControlEvents:UIControlEventTouchUpInside];
    [button addTarget:self action:@selector(handler2) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:button];
}

- (void)handler1 {
    NSLog(@"Click handler 1"); // FIRES!
}

- (void)handler2 {
    NSLog(@"Click handler 2"); // FIRES!
}

@end

我想在 Java/Android 中实现类似的东西，不幸的是，由于第一个侦听器被第二个侦听器取代，这不会起作用：

public class MainActivity extends AppCompatActivity {

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

    Button button = (Button) findViewById(R.id.button);
    button.setText("Click Me!");
    button.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View v) {
        Log.d("Test", "Click handler 1"); // DOES NOT FIRE!
      }
    });
    button.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View v) {
        Log.d("Test", "Click handler 2"); // FIRES!
      }
    });

  }
}

我感谢在 Java/Android 中实现相同目标的任何帮助和建议！

Answer 1

在Android中不是以同样的方式处理吗，创建两个这样的方法更简单：

button.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View v) {
        method1();
        method2();
      }
    });

   private void method1(){
     Log.d("Test", "Click handler 1");
   }

   private void method2(){
     Log.d("Test", "Click handler 2");
   }

作为 View.OnClickListener 状态的 docs：

Register a callback to be invoked when this view is context clicked. If the view is not context clickable, it becomes context clickable

默认不实现多个回调，但您可以自己实现。

Answer 2

了解 RxJava，它是未来 :) http://reactivex.io/

ViewObservable.clicks((Button) getActivity().findViewById(R.id.comment_btn))
            .compose(lifecycleMainObservable().<OnClickEvent>bindLifecycle())
            .subscribe(new Action1<OnClickEvent>() {
                @Override
                public void call(OnClickEvent onClickEvent) {
                    Log.d("Button click", "Button 1 click");
                }
            });

ViewObservable.clicks((Button) getActivity().findViewById(R.id.comment_btn))
            .compose(lifecycleMainObservable().<OnClickEvent>bindLifecycle())
            .subscribe(new Action1<OnClickEvent>() {
                @Override
                public void call(OnClickEvent onClickEvent) {
                    Log.d("Button click", "Button 2 click");
                }
            });

如何在 Android 中注册多个监听器？

How to Register Multiple Listeners in Android?

java

android

onclicklistener