万能RecyclerView分割线
就不多叙述了,直接上代码
import android.content.Context; import android.graphics.Canvas; import android.graphics.Paint; import android.graphics.Rect; import android.support.v7.widget.LinearLayoutManager; import android.support.v7.widget.RecyclerView; import android.util.TypedValue; import android.view.View; public class DividerItemDecoration extends RecyclerView.ItemDecoration { /* * RecyclerView的布局方向,默认先赋值 * 为纵向布局 * RecyclerView 布局可横向,也可纵向 * 横向和纵向对应的分割想画法不一样 * */ private int mOrientation = LinearLayoutManager.VERTICAL; /** * item之间分割线的size,1---5 */ private int mSize; /** * 绘制item分割线的画笔,和设置其属性 * 来绘制个性分割线 */ private Paint mPaint; /** * 构造方法传入布局方向,不可不传 * * @param context context * @param orientation 布局方向 * @param color 颜色 * @param mItemSize item之间分割线的size */ public DividerItemDecoration(Context context, int orientation, int color, int mItemSize) { this.mOrientation = orientation; /* item之间分割线的颜色 */ this.mSize= mItemSize; if (orientation != LinearLayoutManager.VERTICAL && orientation != LinearLayoutManager.HORIZONTAL) { throw new IllegalArgumentException("LinearLayoutManager error"); } mSize = (int) TypedValue.applyDimension(mItemSize, TypedValue.COMPLEX_UNIT_DIP, context.getResources().getDisplayMetrics()); mPaint = new Paint(Paint.ANTI_ALIAS_FLAG); mPaint.setColor(color); /*设置填充*/ mPaint.setStyle(Paint.Style.FILL); } @Override public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) { if (mOrientation == LinearLayoutManager.VERTICAL) { drawVertical(c, parent); } else { drawHorizontal(c, parent); } } /** * 绘制纵向 item 分割线 * * @param canvas canvas * @param parent parent */ private void drawVertical(Canvas canvas, RecyclerView parent) { final int left = parent.getPaddingLeft(); final int right = parent.getMeasuredWidth() - parent.getPaddingRight(); final int childSize = parent.getChildCount(); for (int i = 0; i < childSize; i++) { final View child = parent.getChildAt(i); RecyclerView.LayoutParams layoutParams = (RecyclerView.LayoutParams) child.getLayoutParams(); final int top = child.getBottom() + layoutParams.bottomMargin; final int bottom = top + mSize; canvas.drawRect(left, top, right, bottom, mPaint); } } /** * 绘制横向 item 分割线 * * @param canvas canvas * @param parent parent */ private void drawHorizontal(Canvas canvas, RecyclerView parent) { final int top = parent.getPaddingTop(); final int bottom = parent.getMeasuredHeight() - parent.getPaddingBottom(); final int childSize = parent.getChildCount(); for (int i = 0; i < childSize; i++) { final View child = parent.getChildAt(i); RecyclerView.LayoutParams layoutParams = (RecyclerView.LayoutParams) child.getLayoutParams(); final int left = child.getRight() + layoutParams.rightMargin; final int right = left + mSize; canvas.drawRect(left, top, right, bottom, mPaint); } } /** * 设置item分割线的size * * @param outRect outRect * @param view view * @param parent parent * @param state state */ @Override public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) { if (mOrientation == LinearLayoutManager.VERTICAL) { outRect.set(0, 0, 0, mSize); } else { outRect.set(0, 0, mSize, 0); } } }
调用的时候这样写:
mRecyclerView.addItemDecoration(new DividerItemDecoration(this, LinearLayoutManager.VERTICAL, Color.RED,5));
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