Question

我一直在使用http://www.dev-smart.com/archives/34提供的HorizontalListView示例。但是我的列表项有多个项目，包括图像和按钮。当我点击列表项时，我能够触发onItemClicked＆amp; onItemSelected侦听器，但是我想将触摸事件传播到列表视图中的按钮，这可能吗？

我的XML文件是

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:id="@+id/item"
 android:orientation="vertical"
 android:layout_width="160dip"
 android:layout_height="160dip"
 android:padding="5dip"
 >

 <ImageView
android:id="@+id/image"
android:layout_width="100dip"
android:layout_height="100dip"
android:scaleType="centerCrop"
android:src="@drawable/icon"
/>

  <Button android:id="@+id/click" 
android:text="Add"
android:layout_width="55dip" 
android:layout_height="40dip" 
android:layout_alignRight="@id/image"
android:layout_alignBottom="@id/image"
android:layout_above="@id/image"
android:textSize="14dip"
android:clickable="true"
android:textColor="#FFFFFF"
android:focusable="false"

/>

我的HorizontalListView.java如下

import java.util.LinkedList;
import java.util.Queue;

import android.content.Context;
import android.database.DataSetObserver;
import android.graphics.Color;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.view.GestureDetector;
import android.view.GestureDetector.OnGestureListener;
import android.view.MotionEvent;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.ListAdapter;
import android.widget.Scroller;

public class HorizontalListView extends AdapterView<ListAdapter> {

    public boolean mAlwaysOverrideTouch = true;
    protected ListAdapter mAdapter;
    private int mLeftViewIndex = -1;
    private int mRightViewIndex = 0;
    protected int mCurrentX;
    protected int mNextX;
    private int mMaxX = Integer.MAX_VALUE;
    private int mDisplayOffset = 0;
    protected Scroller mScroller;
    private GestureDetector mGesture;
    private Queue<View> mRemovedViewQueue = new LinkedList<View>();
    private OnItemSelectedListener mOnItemSelected;
    private OnItemClickListener mOnItemClicked;
    private boolean mDataChanged = false;
    protected Button touchedButton = null;

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

    public HorizontalListView(Context context) {
        super(context);
        initView();
    }

    private synchronized void initView() {
        mLeftViewIndex = -1;
        mRightViewIndex = 0;
        mDisplayOffset = 0;
        mCurrentX = 0;
        mNextX = 0;
        mMaxX = Integer.MAX_VALUE;
        mScroller = new Scroller(getContext());
        mGesture = new GestureDetector(getContext(), mOnGesture);
    }

    @Override
    public void setOnItemSelectedListener(AdapterView.OnItemSelectedListener listener) {
        mOnItemSelected = listener;

    }

    @Override
    public void setOnItemClickListener(AdapterView.OnItemClickListener listener){
        mOnItemClicked = listener;

    }


    private DataSetObserver mDataObserver = new DataSetObserver() {

        @Override
        public void onChanged() {
            synchronized(HorizontalListView.this){
                mDataChanged = true;
            }
            invalidate();
            requestLayout();
        }

        @Override
        public void onInvalidated() {
            reset();
            invalidate();
            requestLayout();
        }

    };

    @Override
    public ListAdapter getAdapter() {
        return mAdapter;
    }

    @Override
    public View getSelectedView() {
        //TODO: implement
        return null;
    }

    @Override
    public void setAdapter(ListAdapter adapter) {
        if(mAdapter != null) {
            mAdapter.unregisterDataSetObserver(mDataObserver);
        }
        mAdapter = adapter;
        mAdapter.registerDataSetObserver(mDataObserver);
        reset();
    }

    private synchronized void reset(){
        initView();
        removeAllViewsInLayout();
        requestLayout();
    }

    @Override
    public void setSelection(int position) {
        //TODO: implement
    }

    private void addAndMeasureChild(final View child, int viewPos) {
        LayoutParams params = child.getLayoutParams();
        if(params == null) {
            params = new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT);
        }

        addViewInLayout(child, viewPos, params, true);
        child.measure(MeasureSpec.makeMeasureSpec(getWidth(), MeasureSpec.AT_MOST),
                MeasureSpec.makeMeasureSpec(getHeight(), MeasureSpec.AT_MOST));
    }

    @Override
    protected synchronized void onLayout(boolean changed, int left, int top, int right, int bottom) {
        super.onLayout(changed, left, top, right, bottom);

        if(mAdapter == null){
            return;
        }

        if(mDataChanged){
            int oldCurrentX = mCurrentX;
            initView();
            removeAllViewsInLayout();
            mNextX = oldCurrentX;
            mDataChanged = false;
        }

        if(mScroller.computeScrollOffset()){
            int scrollx = mScroller.getCurrX();
            mNextX = scrollx;
        }

        if(mNextX < 0){
            mNextX = 0;
            mScroller.forceFinished(true);
        }
        if(mNextX > mMaxX) {
            mNextX = mMaxX;
            mScroller.forceFinished(true);
        }

        int dx = mCurrentX - mNextX;

        removeNonVisibleItems(dx);
        fillList(dx);
        positionItems(dx);

        mCurrentX = mNextX;

        if(!mScroller.isFinished()){
            post(new Runnable(){
                @Override
                public void run() {
                    requestLayout();
                }
            });

        }
    }

    private void fillList(final int dx) {
        int edge = 0;
        View child = getChildAt(getChildCount()-1);
        if(child != null) {
            edge = child.getRight();
        }
        fillListRight(edge, dx);

        edge = 0;
        child = getChildAt(0);
        if(child != null) {
            edge = child.getLeft();
        }
        fillListLeft(edge, dx);


    }

    private void fillListRight(int rightEdge, final int dx) {
        while(rightEdge + dx < getWidth() && mRightViewIndex < mAdapter.getCount()) {

            View child = mAdapter.getView(mRightViewIndex, mRemovedViewQueue.poll(), this);
            addAndMeasureChild(child, -1);
            rightEdge += child.getMeasuredWidth();

            if(mRightViewIndex == mAdapter.getCount()-1){
                mMaxX = mCurrentX + rightEdge - getWidth();
            }
            mRightViewIndex++;
        }

    }

    private void fillListLeft(int leftEdge, final int dx) {
        while(leftEdge + dx > 0 && mLeftViewIndex >= 0) {
            View child = mAdapter.getView(mLeftViewIndex, mRemovedViewQueue.poll(), this);
            addAndMeasureChild(child, 0);
            leftEdge -= child.getMeasuredWidth();
            mLeftViewIndex--;
            mDisplayOffset -= child.getMeasuredWidth();
        }
    }

    private void removeNonVisibleItems(final int dx) {
        View child = getChildAt(0);
        while(child != null && child.getRight() + dx <= 0) {
            mDisplayOffset += child.getMeasuredWidth();
            mRemovedViewQueue.offer(child);
            removeViewInLayout(child);
            mLeftViewIndex++;
            child = getChildAt(0);

        }

        child = getChildAt(getChildCount()-1);
        while(child != null && child.getLeft() + dx >= getWidth()) {
            mRemovedViewQueue.offer(child);
            removeViewInLayout(child);
            mRightViewIndex--;
            child = getChildAt(getChildCount()-1);
        }
    }

    private void positionItems(final int dx) {
        if(getChildCount() > 0){
            mDisplayOffset += dx;
            int left = mDisplayOffset;
            for(int i=0;i<getChildCount();i++){
                View child = getChildAt(i);
                int childWidth = child.getMeasuredWidth();
                child.layout(left, 0, left + childWidth, child.getMeasuredHeight());
                left += childWidth;
            }
        }
    }

    public synchronized void scrollTo(int x) {
        mScroller.startScroll(mNextX, 0, x - mNextX, 0);
        requestLayout();
    }

    @Override
    public boolean dispatchTouchEvent(MotionEvent ev) {     
        boolean handled = mGesture.onTouchEvent(ev);
        return handled;
    }

    protected boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
                float velocityY) {
        synchronized(HorizontalListView.this){
            mScroller.fling(mNextX, 0, (int)-velocityX, 0, 0, mMaxX, 0, 0);
        }
        requestLayout();

        return true;
    }

    protected boolean onDown(MotionEvent e) {
        mScroller.forceFinished(true);
        return true;
    }


    private OnGestureListener mOnGesture = new GestureDetector.SimpleOnGestureListener() {



        @Override
        public boolean onDown(MotionEvent e) {

            return HorizontalListView.this.onDown(e);

        }

        @Override
        public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
                float velocityY) {
                return HorizontalListView.this.onFling(e1, e2, velocityX, velocityY);
        }

        @Override
        public boolean onScroll(MotionEvent e1, MotionEvent e2,
                float distanceX, float distanceY) {

            synchronized(HorizontalListView.this){
                mNextX += (int)distanceX;
            }
            requestLayout();

            return true;
        }

        @Override
        public boolean onSingleTapConfirmed(MotionEvent e) {
            Rect viewRect = new Rect();
            for(int i=0;i<getChildCount();i++){
                View child = getChildAt(i);
                int left = child.getLeft();
                int right = child.getRight();
                int top = child.getTop();
                int bottom = child.getBottom();
                viewRect.set(left, top, right, bottom);

                                if(viewRect.contains((int)e.getX(), (int)e.getY())){

                    if(mOnItemClicked != null){
                        mOnItemClicked.onItemClick(HorizontalListView.this, child, mLeftViewIndex + 1 + i, mAdapter.getItemId( mLeftViewIndex + 1 + i ));
                    }
                    if(mOnItemSelected != null){
                        mOnItemSelected.onItemSelected(HorizontalListView.this, child, mLeftViewIndex + 1 + i, mAdapter.getItemId( mLeftViewIndex + 1 + i ));
                    }
                    break;
                }

            }
            return true;
        }
    };



}

我也试过这里给出的建议Custom list clicking with checkboxes但到目前为止没有运气。真的很感激，如果有人可以通过横向滚动这样的自定义视图处理触摸事件的方式提供一些见解。

Answer 1

经过深入挖掘HorizontalListView的代码，我发现你可以使用触摸事件＆amp;通过调用

将其传递给基础视图

super.dispatchTouchEvent(ev);

所以我所要做的就是从

修改方法 dispatchTouchEvent

@Override
public boolean dispatchTouchEvent(MotionEvent ev) {     
    boolean handled = mGesture.onTouchEvent(ev);
    return handled;
}

到

@Override
public boolean dispatchTouchEvent(MotionEvent ev) {     
    boolean handled = mGesture.onTouchEvent(ev);
    return super.dispatchTouchEvent(ev);
}

super.dispatchTouchEvent（ev）调用默认触摸处理程序。不确定是否有人需要这样的行为，但是如果有人偶然发现，这应该可以解决问题。

单击Android中HorizontalListView内的项目

1 个答案:

单击Android中Horizo​​ntalListView内的项目

1 个答案:

单击Android中HorizontalListView内的项目