[英]How to Register Multiple Listeners in Android?
在iOS中,我可以為多個按鈕注冊多個target + action事件處理程序,例如:
@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中實現類似的功能,不幸的是,只要第一個偵聽器替換為第二個偵聽器,這將無法正常工作:
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!
}
});
}
}
感謝您在Java / Android中實現相同的幫助和建議!
閱讀有關RxJava的未來:) 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");
}
});
是不是在Android中以相同的方式處理,並且創建兩個這樣的方法更簡單:
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");
}
作為View.OnClickListener
狀態的文檔 :
注冊上下文單擊上下文時要調用的回調。 如果視圖不是上下文可單擊的,則它變為上下文可單擊的
默認情況下不實現多個回調,但是您可以自己實現。
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