android 分割线组件,Android_RecyclerView的万能分割线，什么是RecyclerView RecyclerView是 - phpStudy...

迈不过友情╰ 2023-10-04 14:26 24阅读 0赞

RecyclerView的万能分割线

什么是RecyclerView

RecyclerView是Android 5.0 materials design中的组件之一，相应的还有CardView、Palette等。看名字我们就能看出一点端倪，没错，它主要的特点就是复用。我们知道，Listview中的Adapter中可以实现ViewHolder的复用。RecyclerView提供了一个耦合度更低的方式来复用ViewHolder，并且可以轻松的实现ListView、GridView以及瀑布流的效果。

先给大家展示下效果图：

使用方法：

添加默认分割线：高度为2px，颜色为灰色

mRecyclerView.addItemDecoration(new RecycleViewDivider(mContext, LinearLayoutManager.VERTICAL));

添加自定义分割线：可自定义分割线drawable

mRecyclerView.addItemDecoration(new RecycleViewDivider(

mContext, LinearLayoutManager.VERTICAL, R.drawable.divider\_mileage));

添加自定义分割线：可自定义分割线高度和颜色

mRecyclerView.addItemDecoration(new RecycleViewDivider(

mContext, LinearLayoutManager.VERTICAL, 10, getResources().getColor(R.color.divide\_gray\_color)));

万能分割线登场：

public class RecycleViewDivider extends RecyclerView.ItemDecoration \{

private Paint mPaint;

private Drawable mDivider;

private int mDividerHeight = 2;//分割线高度，默认为1px

private int mOrientation;//列表的方向：LinearLayoutManager.VERTICAL或LinearLayoutManager.HORIZONTAL

private static final int\[\] ATTRS = new int\[\]\{android.R.attr.listDivider\};

/\*\*

\* 默认分割线：高度为2px，颜色为灰色

\* @param context

\* @param orientation 列表方向

\*/

public RecycleViewDivider(Context context, int orientation) \{

if (orientation != LinearLayoutManager.VERTICAL && orientation != LinearLayoutManager.HORIZONTAL) \{

throw new IllegalArgumentException("请输入正确的参数！");

mOrientation = orientation;

final TypedArray a = context.obtainStyledAttributes(ATTRS);

mDivider = a.getDrawable(0);

a.recycle();

/\*\*

\* 自定义分割线

\* @param context

\* @param orientation 列表方向

\* @param drawableId 分割线图片

\*/

public RecycleViewDivider(Context context, int orientation, int drawableId) \{

this(context, orientation);

mDivider = ContextCompat.getDrawable(context, drawableId);

mDividerHeight = mDivider.getIntrinsicHeight();

/\*\*

\* 自定义分割线

\* @param context

\* @param orientation 列表方向

\* @param dividerHeight 分割线高度

\* @param dividerColor 分割线颜色

\*/

public RecycleViewDivider(Context context, int orientation, int dividerHeight, int dividerColor) \{

this(context, orientation);

mDividerHeight = dividerHeight;

mPaint = new Paint(Paint.ANTI\_ALIAS\_FLAG);

mPaint.setColor(dividerColor);

mPaint.setStyle(Paint.Style.FILL);

//获取分割线尺寸

@Override

public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) \{

super.getItemOffsets(outRect, view, parent, state);

outRect.set(0, 0, 0, mDividerHeight);

//绘制分割线

@Override

public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) \{

super.onDraw(c, parent, state);

if (mOrientation == LinearLayoutManager.VERTICAL) \{

drawVertical(c, parent);

\} else \{

drawHorizontal(c, parent);

//绘制横向 item 分割线

private void drawHorizontal(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 + mDividerHeight;

if (mDivider != null) \{

mDivider.setBounds(left, top, right, bottom);

mDivider.draw(canvas);

if (mPaint != null) \{

canvas.drawRect(left, top, right, bottom, mPaint);

//绘制纵向 item 分割线

private void drawVertical(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 + mDividerHeight;

if (mDivider != null) \{

mDivider.setBounds(left, top, right, bottom);

mDivider.draw(canvas);

if (mPaint != null) \{

canvas.drawRect(left, top, right, bottom, mPaint);

以上所述是小编给大家介绍的RecyclerView的万能分割线，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对phpstudy网站的支持！相关阅读:

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android 分割线组件,Android_RecyclerView的万能分割线，什么是RecyclerView RecyclerView是 - phpStudy...

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