外部解决滑动冲突水平方向和竖直方向滑动冲突实例

来源：互联网发布：mac查询端口占用情况编辑：程序博客网时间：2024/06/05 03:53

1,自定义View

package com.example.demo1;

import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.VelocityTracker;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Scroller;

public class HorizontalScrollViewEx extends ViewGroup {
    private static final String TAG = "HorizontalScrollViewEx";

    private int mChildrenSize;
    private int mChildWidth;
    private int mChildIndex;

    // 分别记录上次滑动的坐标
    private int mLastX = 0;
    private int mLastY = 0;
    // 分别记录上次滑动的坐标(onInterceptTouchEvent)
    private int mLastXIntercept = 0;
    private int mLastYIntercept = 0;

    private Scroller mScroller;
    private VelocityTracker mVelocityTracker;

    public HorizontalScrollViewEx(Context context) {
        super(context);
        init();
    }

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

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

    private void init() {
        mScroller = new Scroller(getContext());
        mVelocityTracker = VelocityTracker.obtain();
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent event) {
        boolean intercepted = false;
        int x = (int) event.getX();
        int y = (int) event.getY();

        switch (event.getAction()) {
        case MotionEvent.ACTION_DOWN: {
            intercepted = false;
            if (!mScroller.isFinished()) {
                mScroller.abortAnimation();
                intercepted = true;
            }
            break;
        }
        case MotionEvent.ACTION_MOVE: {
            int deltaX = x - mLastXIntercept;
            int deltaY = y - mLastYIntercept;
            if (Math.abs(deltaX) > Math.abs(deltaY)) {
                intercepted = true;
            } else {
                intercepted = false;
            }
            break;
        }
        case MotionEvent.ACTION_UP: {
            intercepted = false;
            break;
        }
        default:
            break;
        }

        Log.d(TAG, "intercepted=" + intercepted);
        mLastX = x;
        mLastY = y;
        mLastXIntercept = x;
        mLastYIntercept = y;

        return intercepted;
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        mVelocityTracker.addMovement(event);
        int x = (int) event.getX();
        int y = (int) event.getY();
        switch (event.getAction()) {
        case MotionEvent.ACTION_DOWN: {
            if (!mScroller.isFinished()) {
                mScroller.abortAnimation();
            }
            break;
        }
        case MotionEvent.ACTION_MOVE: {
            int deltaX = x - mLastX;
            int deltaY = y - mLastY;
            scrollBy(-deltaX, 0);
            break;
        }
        case MotionEvent.ACTION_UP: {
            int scrollX = getScrollX();
            int scrollToChildIndex = scrollX / mChildWidth;
            mVelocityTracker.computeCurrentVelocity(1000);
            float xVelocity = mVelocityTracker.getXVelocity();
            if (Math.abs(xVelocity) >= 50) {
                mChildIndex = xVelocity > 0 ? mChildIndex - 1 : mChildIndex + 1;
            } else {
                mChildIndex = (scrollX + mChildWidth / 2) / mChildWidth;
            }
            mChildIndex = Math.max(0, Math.min(mChildIndex, mChildrenSize - 1));
            int dx = mChildIndex * mChildWidth - scrollX;
            smoothScrollBy(dx, 0);
            mVelocityTracker.clear();
            break;
        }
        default:
            break;
        }

        mLastX = x;
        mLastY = y;
        return true;
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        int measuredWidth = 0;
        int measuredHeight = 0;
        final int childCount = getChildCount();
        measureChildren(widthMeasureSpec, heightMeasureSpec);

        int widthSpaceSize = MeasureSpec.getSize(widthMeasureSpec);
        int widthSpecMode = MeasureSpec.getMode(widthMeasureSpec);
        int heightSpaceSize = MeasureSpec.getSize(heightMeasureSpec);
        int heightSpecMode = MeasureSpec.getMode(heightMeasureSpec);
        if (childCount == 0) {
            setMeasuredDimension(0, 0);
        } else if (heightSpecMode == MeasureSpec.AT_MOST) {
            final View childView = getChildAt(0);
            measuredHeight = childView.getMeasuredHeight();
            setMeasuredDimension(widthSpaceSize, childView.getMeasuredHeight());
        } else if (widthSpecMode == MeasureSpec.AT_MOST) {
            final View childView = getChildAt(0);
            measuredWidth = childView.getMeasuredWidth() * childCount;
            setMeasuredDimension(measuredWidth, heightSpaceSize);
        } else {
            final View childView = getChildAt(0);
            measuredWidth = childView.getMeasuredWidth() * childCount;
            measuredHeight = childView.getMeasuredHeight();
            setMeasuredDimension(measuredWidth, measuredHeight);
        }
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        int childLeft = 0;
        final int childCount = getChildCount();
        mChildrenSize = childCount;

        for (int i = 0; i < childCount; i++) {
            final View childView = getChildAt(i);
            if (childView.getVisibility() != View.GONE) {
                final int childWidth = childView.getMeasuredWidth();
                mChildWidth = childWidth;
                childView.layout(childLeft, 0, childLeft + childWidth,
                        childView.getMeasuredHeight());
                childLeft += childWidth;
            }
        }
    }

    private void smoothScrollBy(int dx, int dy) {
        mScroller.startScroll(getScrollX(), 0, dx, 0, 500);
        invalidate();
    }

    @Override
    public void computeScroll() {
        if (mScroller.computeScrollOffset()) {
            scrollTo(mScroller.getCurrX(), mScroller.getCurrY());
            postInvalidate();
        }
    }

    @Override
    protected void onDetachedFromWindow() {
        mVelocityTracker.recycle();
        super.onDetachedFromWindow();
    }
}

    }
}

关键代码：

package com.example.demo1;

import java.util.ArrayList;

import com.example.utils.MyUtils;

import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {

   private HorizontalScrollViewEx mListContainer;
   @Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_main);
       initView();
   }

   private void initView() {
       LayoutInflater inflater = getLayoutInflater();
       mListContainer = (HorizontalScrollViewEx) findViewById(R.id.container);
       final int screenWidth = MyUtils.getScreenMetrics(this).widthPixels;
       final int screenHeight = MyUtils.getScreenMetrics(this).heightPixels;
       for (int i = 0; i < 3; i++) {
           ViewGroup layout = (ViewGroup) inflater.inflate(R.layout.content_layout, mListContainer, false);
           layout.getLayoutParams().width=screenWidth;
           TextView textView =(TextView) layout.findViewById(R.id.title);
           textView.setText("page"+(i+1));
           layout.setBackgroundColor(Color.rgb(255/(i+1), 255/(i+1), 0));
           createList(layout);
           mListContainer.addView(layout);
       }
   }

   private void createList(ViewGroup layout) {
       ListView listView = (ListView) layout.findViewById(R.id.list);
       ArrayList<String> datas = new ArrayList<String>();
       for (int i = 0; i < 50; i++) {
           datas.add("name "+i);
       }

       ArrayAdapter<String> adapter = new ArrayAdapter<String> (this,R.layout.content_list_item,R.id.name,datas);
       listView.setAdapter(adapter);
       listView.setOnItemClickListener(new OnItemClickListener() {

           @Override
           public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
               Toast.makeText(MainActivity.this, "click_item", Toast.LENGTH_SHORT).show();
           }
       });
   }

}

3，acitivy_main.xml代码

4,content_layout代码

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="5dp"
        android:layout_marginBottom="5dp"
        android:text="TextView" />

    <ListView
        android:id="@+id/list"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="#fff4f7f9"
        android:cacheColorHint="#00000000"
        android:divider="#dddbdb"
        android:dividerHeight="1.0px"
        android:listSelector="@android:color/transparent" />

</LinearLayout>

5，content_list_item.xml

public static DisplayMetrics getScreenMetrics(Context context) {
        WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
        DisplayMetrics dm = new DisplayMetrics();
        wm.getDefaultDisplay().getMetrics(dm);
        return dm;
    }

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