Android Studio第二十九期 - RecycleView的表格形式

Posted 2020-08-27

    本来说好了，最后一篇了，结果又来了一个新需求，就再写一篇吧~

    效果图是这样的：

    

    思路是这样：

    

    demo效果：

    

    其实要注意的地方是：

    1.RecycleView在ScrollView中不滚动的设置；

    2.RecycleView在ScrollView中滚动不灵敏；

    3.RecycleView表格显示列数的填充算法；

    不滚动的写法：

    FullyLinearLayoutManager：

package com.example.p010_recycleviewall.recycleviewbiaoge;

import android.content.Context;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;

/**
 * Created by shining on 2017/1/10 0010.
 */

public class FullyLinearLayoutManager extends LinearLayoutManager {

    private static final String TAG = FullyLinearLayoutManager.class.getSimpleName();

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

    public FullyLinearLayoutManager(Context context, int orientation, boolean reverseLayout) {
        super(context, orientation, reverseLayout);
    }

    private int[] mMeasuredDimension = new int[2];

    @Override
    public void onMeasure(RecyclerView.Recycler recycler, RecyclerView.State state,
                          int widthSpec, int heightSpec) {

        final int widthMode = View.MeasureSpec.getMode(widthSpec);
        final int heightMode = View.MeasureSpec.getMode(heightSpec);
        final int widthSize = View.MeasureSpec.getSize(widthSpec);
        final int heightSize = View.MeasureSpec.getSize(heightSpec);

        Log.i(TAG, "onMeasure called. \nwidthMode " + widthMode
                + " \nheightMode " + heightSpec
                + " \nwidthSize " + widthSize
                + " \nheightSize " + heightSize
                + " \ngetItemCount() " + getItemCount());

        int width = 0;
        int height = 0;
        for (int i = 0; i < getItemCount(); i++) {
            measureScrapChild(recycler, i,
                    View.MeasureSpec.makeMeasureSpec(i, View.MeasureSpec.UNSPECIFIED),
                    View.MeasureSpec.makeMeasureSpec(i, View.MeasureSpec.UNSPECIFIED),
                    mMeasuredDimension);

            if (getOrientation() == HORIZONTAL) {
                width = width + mMeasuredDimension[0];
                if (i == 0) {
                    height = mMeasuredDimension[1];
                }
            } else {
                height = height + mMeasuredDimension[1];
                if (i == 0) {
                    width = mMeasuredDimension[0];
                }
            }
        }
        switch (widthMode) {
            case View.MeasureSpec.EXACTLY:
                width = widthSize;
            case View.MeasureSpec.AT_MOST:
            case View.MeasureSpec.UNSPECIFIED:
        }

        switch (heightMode) {
            case View.MeasureSpec.EXACTLY:
                height = heightSize;
            case View.MeasureSpec.AT_MOST:
            case View.MeasureSpec.UNSPECIFIED:
        }

        setMeasuredDimension(width, height);
    }

    private void measureScrapChild(RecyclerView.Recycler recycler, int position, int widthSpec,
                                   int heightSpec, int[] measuredDimension) {
        try {
            View view = recycler.getViewForPosition(0);//fix 动态添加时报IndexOutOfBoundsException

            if (view != null) {
                RecyclerView.LayoutParams p = (RecyclerView.LayoutParams) view.getLayoutParams();

                int childWidthSpec = ViewGroup.getChildMeasureSpec(widthSpec,
                        getPaddingLeft() + getPaddingRight(), p.width);

                int childHeightSpec = ViewGroup.getChildMeasureSpec(heightSpec,
                        getPaddingTop() + getPaddingBottom(), p.height);

                view.measure(childWidthSpec, childHeightSpec);
                measuredDimension[0] = view.getMeasuredWidth() + p.leftMargin + p.rightMargin;
                measuredDimension[1] = view.getMeasuredHeight() + p.bottomMargin + p.topMargin;
                recycler.recycleView(view);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
        }
    }
}

    FullyGridLayoutManager：

package com.example.p010_recycleviewall.recycleviewbiaoge;

import android.content.Context;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.view.ViewGroup;

/**
 * Created by shining on 2017/1/10 0010.
 */
public class FullyGridLayoutManager extends GridLayoutManager {

    private int mwidth = 0;
    private int mheight = 0;

    public FullyGridLayoutManager(Context context, int spanCount) {
        super(context, spanCount);
    }

    public FullyGridLayoutManager(Context context, int spanCount, int orientation, boolean reverseLayout) {
        super(context, spanCount, orientation, reverseLayout);
    }

    private int[] mMeasuredDimension = new int[2];

    public int getMwidth() {
        return mwidth;
    }

    public void setMwidth(int mwidth) {
        this.mwidth = mwidth;
    }

    public int getMheight() {
        return mheight;
    }

    public void setMheight(int mheight) {
        this.mheight = mheight;
    }

    @Override
    public void onMeasure(RecyclerView.Recycler recycler, RecyclerView.State state, int widthSpec, int heightSpec) {
        final int widthMode = View.MeasureSpec.getMode(widthSpec);
        final int heightMode = View.MeasureSpec.getMode(heightSpec);
        final int widthSize = View.MeasureSpec.getSize(widthSpec);
        final int heightSize = View.MeasureSpec.getSize(heightSpec);

        int width = 0;
        int height = 0;
        int count = getItemCount();
        int span = getSpanCount();
        for (int i = 0; i < count; i++) {
            measureScrapChild(recycler, i,
                    View.MeasureSpec.makeMeasureSpec(i, View.MeasureSpec.UNSPECIFIED),
                    View.MeasureSpec.makeMeasureSpec(i, View.MeasureSpec.UNSPECIFIED),
                    mMeasuredDimension);

            if (getOrientation() == HORIZONTAL) {
                if (i % span == 0) {
                    width = width + mMeasuredDimension[0];
                }
                if (i == 0) {
                    height = mMeasuredDimension[1];
                }
            } else {
                if (i % span == 0) {
                    height = height + mMeasuredDimension[1];
                }
                if (i == 0) {
                    width = mMeasuredDimension[0];
                }
            }
        }

        switch (widthMode) {
            case View.MeasureSpec.EXACTLY:
                width = widthSize;
            case View.MeasureSpec.AT_MOST:
            case View.MeasureSpec.UNSPECIFIED:
        }

        switch (heightMode) {
            case View.MeasureSpec.EXACTLY:
                height = heightSize;
            case View.MeasureSpec.AT_MOST:
            case View.MeasureSpec.UNSPECIFIED:
        }
        setMheight(height);
        setMwidth(width);
        setMeasuredDimension(width, height);
    }

    private void measureScrapChild(RecyclerView.Recycler recycler, int position, int widthSpec,
                                   int heightSpec, int[] measuredDimension) {
        if (position < getItemCount()) {
            try {
                View view = recycler.getViewForPosition(0);//fix 动态添加时报IndexOutOfBoundsException
                if (view != null) {
                    RecyclerView.LayoutParams p = (RecyclerView.LayoutParams) view.getLayoutParams();
                    int childWidthSpec = ViewGroup.getChildMeasureSpec(widthSpec,
                            getPaddingLeft() + getPaddingRight(), p.width);
                    int childHeightSpec = ViewGroup.getChildMeasureSpec(heightSpec,
                            getPaddingTop() + getPaddingBottom(), p.height);
                    view.measure(childWidthSpec, childHeightSpec);
                    measuredDimension[0] = view.getMeasuredWidth() + p.leftMargin + p.rightMargin;
                    measuredDimension[1] = view.getMeasuredHeight() + p.bottomMargin + p.topMargin;
                    recycler.recycleView(view);
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}

    滚动不灵敏：

    1.可以设置自定义的NoScrollView：

package com.example.p010_recycleviewall.widget.NoScrollView;

import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.ViewConfiguration;
import android.widget.ScrollView;

public class NoScrollView extends ScrollView {

   private int mTouchSlop;

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

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

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

   private void init(Context context) {
      mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
   }

   float downX;
   float downY;

   @Override
   public boolean onInterceptTouchEvent(MotionEvent ev) {
      int action = ev.getAction();

      switch (action) {
      case MotionEvent.ACTION_DOWN:
         downX = ev.getX();
         downY = ev.getY();
         break;
      case MotionEvent.ACTION_MOVE:
         if (Math.abs(ev.getX() - downX) > mTouchSlop) {
            return false;
         }
         break;
      default:
         break;
      }
      return super.onInterceptTouchEvent(ev);
   }
   
}

    2.设置RecycleView：

recyclerView1.setNestedScrollingEnabled(false);

    剩下的就是算法：

//判断条件如果
if ((mList1.size()-1)%3==0){
    //1 4 7 add 2
    mList1.add(new Biaoge_listBean(""));
    mList1.add(new Biaoge_listBean(""));
}
if ((mList1.size()-1)%3==1){
    //2 5 8 add 1
    mList1.add(new Biaoge_listBean(""));
}

    唉~能不能不加班看~都过年了~能不能休息一下~麻蛋~就这吧~

    

    地址：https://github.com/geeklx/MyApplication/tree/master/p010_recycleviewall/src/main/java/com/example/p010_recycleviewall/recycleviewbiaoge

本文出自 “梁肖技术中心” 博客，请务必保留此出处http://liangxiao.blog.51cto.com/3626612/1890790