RecyclerView分隔条

最新推荐文章于 2024-06-07 22:34:55 发布

lin-0410

最新推荐文章于 2024-06-07 22:34:55 发布

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分类专栏： android开发文章标签： RecyclerView分割条

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由于找不到直接控件为RecyclerView添加item间隔和定义分隔条颜色，因此进行自定义。通过自定义可方便设置分隔条颜色和item间隔。

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因为没能找到直接的控件，给RecyclerView添加item间隔，及定义分隔条颜色，所以自定义RecyclerView分隔条，方便自定义分隔条颜色，item间隔，

package com.custom.views;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.drawable.ColorDrawable;
import android.graphics.drawable.Drawable;
import android.view.View;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

public class RecyclerViewDivider extends RecyclerView.ItemDecoration{
    private final Context mContext;
    private final int mOrientation;
//item默认间隔宽度
    private static final int DEFAULT_INTERVAL = 24;
    private static final int DEFAULT_DIVIDER_COLOR = Color.GRAY;
//分隔条宽度
    private final int mDividerPixel = 2;
    private final int mInterval;
    private final int mDividerColor;
    private final Paint mPaint;
    private final Drawable mDivider;

    public RecyclerViewDivider(Context context, int orientation) {
        this(context, orientation, DEFAULT_INTERVAL, DEFAULT_DIVIDER_COLOR);
    }

    public RecyclerViewDivider(Context context, int orientation, int interval) {
        this(context, orientation, interval, DEFAULT_DIVIDER_COLOR);
    }

    public RecyclerViewDivider(Context context, int orientation, int interval, int color) {
        if (orientation != LinearLayoutManager.HORIZONTAL && orientation != LinearLayoutManager.VERTICAL) {
            throw new IllegalArgumentException("orientation invalid.");
        }
        mContext = context;
        mOrientation = orientation;
        mInterval = interval;
        mDividerColor = color;
        mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        mPaint.setColor(mDividerColor);
        mPaint.setStyle(Paint.Style.FILL);
        mDivider = new ColorDrawable(Color.GRAY);
    }

    @Override
    public void getItemOffsets(@NonNull Rect outRect, @NonNull View view, @NonNull RecyclerView parent, @NonNull RecyclerView.State state) {
        super.getItemOffsets(outRect, view, parent, state);
        if (mOrientation == LinearLayoutManager.HORIZONTAL) {
            outRect.set(0, 0, mDividerPixel + DEFAULT_INTERVAL, 0);
        } else if (mOrientation == LinearLayoutManager.VERTICAL) {
            outRect.set(0, 0, 0, mDividerPixel + DEFAULT_INTERVAL);
        }
    }

    @Override
    public void onDraw(@NonNull Canvas canvas, @NonNull RecyclerView parent, @NonNull RecyclerView.State state) {
        super.onDraw(canvas, parent, state);
        if (mOrientation == LinearLayoutManager.HORIZONTAL) {
            drawVertical(canvas, parent);
        } else {
            drawHorizontal(canvas, parent);
        }
    }

    private void drawHorizontal(Canvas canvas, RecyclerView recyclerView) {
        final int left = recyclerView.getPaddingLeft();
        final int right = recyclerView.getMeasuredWidth() - recyclerView.getPaddingLeft();
        final int childSize = recyclerView.getChildCount();

        for (int i = 0; i < childSize - 1; i++) {
            final View child = recyclerView.getChildAt(i);
            RecyclerView.LayoutParams layoutParams = (RecyclerView.LayoutParams) child.getLayoutParams();
//调整分隔条在间隔宽度中间
            final int top = child.getBottom() + layoutParams.bottomMargin + DEFAULT_INTERVAL / 2;
            final int bottom = top + mDividerPixel;
            mDivider.setBounds(left, top, right, bottom);
            mDivider.draw(canvas);
            canvas.drawRect(left, top, right, bottom ,mPaint);
        }
    }

    private void drawVertical(Canvas canvas, RecyclerView recyclerView) {
        final int top = recyclerView.getPaddingTop();
        final int bottom = recyclerView.getMeasuredHeight() - recyclerView.getPaddingBottom();
        final int childSize = recyclerView.getChildCount();
        for (int i = 0; i < childSize - 1; i++) {
            final View child = recyclerView.getChildAt(i);
            RecyclerView.LayoutParams layoutParams = (RecyclerView.LayoutParams) child.getLayoutParams();
//调整分隔条在间隔宽度中间
            final int left = child.getRight() + layoutParams.rightMargin + DEFAULT_INTERVAL / 2;
            final int right = left + mDividerPixel;
            mDivider.setBounds(left, top, right, bottom);
            mDivider.draw(canvas);
            canvas.drawRect(left, top, right, bottom, mPaint);
        }
    }
}