给RecyclerView设置分割线
因为 RecyclerView 没有自己的分割线，所以需要自己定义分割线，简单的实现一个 RecyclerView 的横向和竖线的分割线
package com.example.demo.adapter;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.view.View;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
/**
* 设置分割线
*/
public class DividerItemDecoration extends RecyclerView.ItemDecoration {
private static final int[] ATTRS = new int[]{
android.R.attr.listDivider
};
public static final int HORIZONTAL_LIST = LinearLayoutManager.HORIZONTAL;
public static final int VERTICAL_LIST = LinearLayoutManager.VERTICAL;
private Drawable divider;
private int mOrientation;
public DividerItemDecoration(Context context, int orientation) {
final TypedArray a = context.obtainStyledAttributes(ATTRS);
divider = a.getDrawable(0);
a.recycle();
setOrientation(orientation);
}
/**
* 设置方向
* @param orientation
*/
private void setOrientation(int orientation) {
if(orientation != HORIZONTAL_LIST && orientation != VERTICAL_LIST){
throw new IllegalArgumentException("无效参数：orientation");
}
mOrientation = orientation;
}
@Override
public void onDraw(@NonNull Canvas c, @NonNull RecyclerView parent, @NonNull RecyclerView.State state) {
if(mOrientation == VERTICAL_LIST){
drawVertical(c,parent);
}else{
drawHorizontal(c,parent);
}
}
/**
* 绘制横向排列分割线
* @param c
* @param parent
*/
private void drawHorizontal(Canvas c, RecyclerView parent) {
final int top = parent.getPaddingTop();
final int bottom = parent.getHeight() - parent.getPaddingBottom();
final int childCount = parent.getChildCount();
for (int i = 0; i < childCount;i++){
final View child = parent.getChildAt(i);
final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();
final int left = child.getRight() + params.rightMargin;
final int right = left + divider.getIntrinsicHeight();
divider.setBounds(left,top,right,bottom);
divider.draw(c);
}
}
/**
* 设置竖向排列分割线
* @param c
* @param parent
*/
private void drawVertical(Canvas c, RecyclerView parent) {
final int left = parent.getPaddingLeft();
final int right = parent.getWidth() - parent.getPaddingRight();
final int childCount = parent.getChildCount();
for (int i = 0; i < childCount;i++){
final View child = parent.getChildAt(i);
RecyclerView v = new RecyclerView(parent.getContext());
final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();
final int top = child.getBottom() + params.bottomMargin;
final int bottom = top + divider.getIntrinsicHeight();
divider.setBounds(left,top,right,bottom);
divider.draw(c);
}
}
@Override
public void getItemOffsets(@NonNull Rect outRect, @NonNull View view, @NonNull RecyclerView parent, @NonNull RecyclerView.State state) {
if(mOrientation == VERTICAL_LIST){
outRect.set(0,0,0,divider.getIntrinsicHeight());
}else{
outRect.set(0,0,divider.getIntrinsicWidth(),0);
}
}
}
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使用
RecyclerView recyclerView = findViewById(R.id.recyclerview);
recyclerView.addItemDecoration(new DividerItemDecoration(this,DividerItemDecoration.VERTICAL_LIST));
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上次更新: 2024/01/12, 11:30:32