在Android Gallery控件上收听动画结束

在Android Gallery控件上收听动画结束,android,android-layout,android-animation,Android,Android Layout,Android Animation,我有一个标准的Android Gallery控件: <Gallery android:id="@+id/galArt" android:spacing="10dp" android:fadingEdgeLength="0dp" android:unselectedAlpha="1" android:layout_width="fill_parent" android:layout_height="fill_parent" /> 从

我有一个标准的Android Gallery控件:

<Gallery
    android:id="@+id/galArt"
    android:spacing="10dp"
    android:fadingEdgeLength="0dp"
    android:unselectedAlpha="1"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" />

从中,我用以下代码收听事件:

galArt.setOnItemSelectedListener(new OnItemSelectedListener() {
        public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {
            showMessageToast("Selected: " + pos);           
        }
        public void onNothingSelected(AdapterView<?> arg0) {}
    });
galArt.setOnItemSelectedListener(新的OnItemSelectedListener(){
已选择公共位置(AdapterView父项、视图、整数位置、长id){
showMessageToast(“选定:“+pos”);
}
未选择的公共无效(AdapterView arg0){}
});
我猜它的作用是这样的:当我滑动图像时,我会得到一个祝酒词,告诉我现在选择了哪个图像

但是,当动画仍在运行时,此土司会在图像停止滑动之前显示。我想在它停止滑动后采取行动,以避免中断动画


动画制作完成后,我可以听什么来获得通知?

好的,我找到了一个解决方案。请注意,这只是一个解决方案,不一定是最佳解决方案

我的解决方案是忽略所有逻辑事件(比如onScroll或onAnimationEnd,因为我无法让它们中的任何一个正常工作),并侦听子视图位置中的更改。当子视图处于静止状态时,动画结束

这样做的一个实际好处是,这对拖动和投掷都有效

问题是,onItemSelected函数将从UI线程以外的其他线程调用。通过使用活动的runOnUIThread函数解决此问题,如示例所示

监听更改的方法(请注意,这不是常规的onimerselected函数,而是我自己的onimerreallyselected):


海尔伦德,我试过你的解决方案,效果很好。唯一的问题是,当你启动Gallery时,它不会在第一个项目上启动。你有解决这个问题的方法吗?没有,我从来不需要在画廊初始化时启动它。我建议您在第一次设置函数()后手动调用它。或者,您可以在ArtGallery类中重写setAdapter或类似的内容,然后从那里调用fireOnSelected。
galArt.setOnItemReallySelectedListener(new OnItemSelectedListener() {
    public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {
            _activity.runOnUiThread(new Runnable() {
                public void run() {
                    //Do your stuff here ...
                }
            });
    }
    public void onNothingSelected(AdapterView<?> arg0) {
        //... or here.
    }
});
import java.util.Timer;
import java.util.TimerTask;

import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.widget.Gallery;

public class ArtGallery extends Gallery {

    OnItemSelectedListener _listener;
    Timer _timer = new Timer();

    public ArtGallery(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    public ArtGallery(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public ArtGallery(Context context) {
        super(context);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if(event.getAction()==MotionEvent.ACTION_UP){
            setTimer();
        }
        return super.onTouchEvent(event);
    }

    private int _lastScrollX = Integer.MIN_VALUE;
    private void setTimer() {
        //Cancel existing tasks (if any), and create a new timer.
        _timer.cancel();
        _timer = new Timer();

        //Schedule our animation check.
        _timer.schedule(new TimerTask() {
            @Override
            public void run() {
                //Just some value that will change while the animation is running.
                int x = getSelectedView().getLeft(); 
                if(_lastScrollX != x){
                    //Value has changed; save current value, and reset the timer.
                    _lastScrollX = x;
                    setTimer();
                }else{
                    //The value hasn't changed during the last 50ms. That probably means that the animation has stopped.
                    fireOnSelected();
                }
            }
        }, 50); 
    }

    public void setOnItemReallySelectedListener(OnItemSelectedListener listener){
        _listener = listener;
    }

    //This function is copied from the Android Gallery source code, and works exactly like the original one.
    private void fireOnSelected() {
        if (_listener == null)
            return;

        int selection = this.getSelectedItemPosition();
        if (selection >= 0) {
            _listener.onItemSelected(this, getSelectedView(), selection, getAdapter().getItemId(selection));
        } else {
            _listener.onNothingSelected(this);
        }

    }
}