Fragment设置GestureDetector滑动监听(完美解决方案)

雨点打透心脏的1/2处 2022-08-06 05:07 252阅读 0赞

原文摘自：[http://www.apkbus.com/android-78656-1-1.html][http_www.apkbus.com_android-78656-1-1.html]

以下操作步骤将帮助大家在使用FragmentActivity时使Fragment能触发到滑动事件：

1、在主activity(如MainContainerActivity)中设置一个接口(直接添加如下方法)：

private ArrayList<MyOnTouchListener> onTouchListeners = new ArrayList<MyOnTouchListener>(
    			10);
    
    	@Override
    	public boolean dispatchTouchEvent(MotionEvent ev) {
    		for (MyOnTouchListener listener : onTouchListeners) {
    			listener.onTouch(ev);
    		}
    		return super.dispatchTouchEvent(ev);
    	}
    
    	public void registerMyOnTouchListener(MyOnTouchListener myOnTouchListener) {
    		onTouchListeners.add(myOnTouchListener);
    	}
    
    	public void unregisterMyOnTouchListener(MyOnTouchListener myOnTouchListener) {
    		onTouchListeners.remove(myOnTouchListener);
    	}
    
    	public interface MyOnTouchListener {
    		public boolean onTouch(MotionEvent ev);
    	}

2、使Fragment实现OnGestureListener接口并实现onFling方法，定义一个手势对象private GestureDetector detector，绑定该对象到Fragment,在Fragment的onCreateView中实例化主activity的接口即可实现调用Fragment的onFling方法。

Fragment中具体代码如下：

import android.view.GestureDetector;
    import android.view.GestureDetector.OnGestureListener;
    import android.view.MotionEvent;
    import android.view.View;
    
    public class ScanDetailsEditFragment extends MyFragment implements
    		TabContentFactory, OnGestureListener {
    	// 滑动手势
    	private GestureDetector detector;
    
    
    	@Override
    	public View onCreateView(LayoutInflater inflater, ViewGroup container,
    			Bundle savedInstanceState) {
    		//to-do
    		final GestureDetector mGestureDetector = new GestureDetector(
    				getActivity(), this);
    		MainContainerActivity.MyOnTouchListener myOnTouchListener = new MainContainerActivity.MyOnTouchListener() {
    			@Override
    			public boolean onTouch(MotionEvent ev) {
    				boolean result = mGestureDetector.onTouchEvent(ev);
    				return result;
    			}
    		};
    
    		((MainContainerActivity) getActivity())
    				.registerMyOnTouchListener(myOnTouchListener);
    		return view;
    	}
    
    
    
    
    	public void flingLeft() {//自定义方法：处理向左滑动事件
    
    	}
    
    	public void flingRight() {//自定义方法：处理向右滑动事件
    
    	}
    
    
    
    	@Override
    	public boolean onDown(MotionEvent arg0) {
    		return false;
    	}
    
    	@Override
    	public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
    			float velocityY) {
    		try {
    			if (e1.getX() - e2.getX() < -89) {
    				flingLeft();
    				return true;
    			} else if (e1.getX() - e2.getX() > 89) {
    				flingRight();
    				return true;
    			}
    		} catch (Exception e) {
    		}
    		return false;
    	}
    
    	@Override
    	public void onLongPress(MotionEvent e) {
    	}
    
    	@Override
    	public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,
    			float distanceY) {
    		return false;
    	}
    
    	@Override
    	public void onShowPress(MotionEvent e) {
    	}
    
    	@Override
    	public boolean onSingleTapUp(MotionEvent e) {
    		return false;
    	}
    
    }

[http_www.apkbus.com_android-78656-1-1.html]: http://www.apkbus.com/android-78656-1-1.html