編輯:關於Android編程
最近遇到一個問題,用RecyclerView顯示數據,縱向列表顯示,添加默認分割線。
問題是:底部也會顯示分割線,這很影響美觀。
怎麼解決這個問題呢?我想了很多辦法,毫無頭緒。。。
最後,查看默認分割線的類DividerItemDecoration的源碼:
public class DividerItemDecoration extends ItemDecoration { private static final int[] ATTRS = new int[]{16843284}; public static final int HORIZONTAL_LIST = 0; public static final int VERTICAL_LIST = 1; private Drawable mDivider; private int mOrientation; public DividerItemDecoration(Context context, int orientation) { TypedArray a = context.obtainStyledAttributes(ATTRS); this.mDivider = a.getDrawable(0); a.recycle(); this.setOrientation(orientation); } public void setOrientation(int orientation) { if(orientation != 0 && orientation != 1) { throw new IllegalArgumentException("invalid orientation"); } else { this.mOrientation = orientation; } } public void onDraw(Canvas c, RecyclerView parent) { if(this.mOrientation == 1) { this.drawVertical(c, parent); } else { this.drawHorizontal(c, parent); } } public void drawVertical(Canvas c, RecyclerView parent) { int left = parent.getPaddingLeft(); int right = parent.getWidth() - parent.getPaddingRight(); int childCount = parent.getChildCount(); for(int i = 0; i < childCount; ++i) { View child = parent.getChildAt(i); LayoutParams params = (LayoutParams)child.getLayoutParams(); int top = child.getBottom() + params.bottomMargin; int bottom = top + this.mDivider.getIntrinsicHeight(); this.mDivider.setBounds(left, top, right, bottom); this.mDivider.draw(c); } } public void drawHorizontal(Canvas c, RecyclerView parent) { int top = parent.getPaddingTop(); int bottom = parent.getHeight() - parent.getPaddingBottom(); int childCount = parent.getChildCount(); for(int i = 0; i < childCount; ++i) { View child = parent.getChildAt(i); LayoutParams params = (LayoutParams)child.getLayoutParams(); int left = child.getRight() + params.rightMargin; int right = left + this.mDivider.getIntrinsicHeight(); this.mDivider.setBounds(left, top, right, bottom); this.mDivider.draw(c); } } public void getItemOffsets(Rect outRect, int itemPosition, RecyclerView parent) { if(this.mOrientation == 1) { outRect.set(0, 0, 0, this.mDivider.getIntrinsicHeight()); } else { outRect.set(0, 0, this.mDivider.getIntrinsicWidth(), 0); } } }
因為我用到的是垂直列表,用到的是紅色字體處的代碼:
public void drawVertical(Canvas c, RecyclerView parent) { int left = parent.getPaddingLeft(); int right = parent.getWidth() - parent.getPaddingRight(); int childCount = parent.getChildCount(); for(int i = 0; i < childCount; ++i) { View child = parent.getChildAt(i); LayoutParams params = (LayoutParams)child.getLayoutParams(); int top = child.getBottom() + params.bottomMargin; int bottom = top + this.mDivider.getIntrinsicHeight(); this.mDivider.setBounds(left, top, right, bottom); this.mDivider.draw(c); } }
從代碼中很容易看出只要修改for循環中的內容就可去掉底部的分割線:
public void drawVertical(Canvas c, RecyclerView parent) { int left = parent.getPaddingLeft(); int right = parent.getWidth() - parent.getPaddingRight(); int childCount = parent.getChildCount(); for(int i = 0; i < childCount-1; ++i) { View child = parent.getChildAt(i); LayoutParams params = (LayoutParams)child.getLayoutParams(); int top = child.getBottom() + params.bottomMargin; int bottom = top + this.mDivider.getIntrinsicHeight(); this.mDivider.setBounds(left, top, right, bottom); this.mDivider.draw(c); } }
因為這個類我們不能直接修改,所以我們可以自定義一個類,修改相應內容,
添加分割線的時候,使用自定義類。
以上就是本文的全部內容,希望對大家的學習有所幫助,也希望大家多多支持本站。
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