解決RecycleView分割線不居中的三種方法
更新時間：2016年05月27日 11:19:22 作者：pengkv
這篇文章主要為大家分享了解決RecycleView分割線不居中的三種方法，感興趣的小伙伴們可以參考一下
本文為大家分享了三種RecycleView分割線不居中的解決方法，供大家參考，具體內容和如下
方法一：
public class SpacesItemDecoration extends RecyclerView.ItemDecoration {
private int mSpace;
private int mSpanCount; // RecyclerView有多少列
private boolean mHasPadding; // RecyclerView是否有Padding
public SpacesItemDecoration(int mSpace) {
this.mSpace = mSpace;
this.mHasPadding = true;
}
public SpacesItemDecoration(int mSpace, boolean hasPadding) {
this.mSpace = mSpace;
this.mHasPadding = hasPadding;
}
@Override
public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
// 初始化列數(shù)
if (mSpanCount == 0) {
this.mSpanCount = ((GridLayoutManager) parent.getLayoutManager()).getSpanCount();
}
int position = parent.getChildAdapterPosition(view); // item position
int column = position % mSpanCount; // item column
if (mHasPadding) {
outRect.left = mSpace - column * mSpace / mSpanCount; // spacing - column * ((1f / spanCount) * spacing)
outRect.right = (column + 1) * mSpace / mSpanCount; // (column + 1) * ((1f / spanCount) * spacing)
if (position < mSpanCount) { // top edge
outRect.top = mSpace;
}
outRect.bottom = mSpace; // item bottom
} else {
outRect.left = column * mSpace / mSpanCount; // column * ((1f / spanCount) * spacing)
outRect.right = mSpace - (column + 1) * mSpace / mSpanCount; // spacing - (column + 1) * ((1f / spanCount) * spacing)
if (position >= mSpanCount) {
outRect.top = mSpace; // item top
}
}
}
public void setHasPadding(boolean hasPadding) {
this.mHasPadding = hasPadding;
}
}
方法二：
public class MutiItemDecoration extends RecyclerView.ItemDecoration {
public enum Type {
VERTICAL, HORIZONTAL, ALL
}
private Type type;//分割線類型
private int dividerSize = 10;//分割線尺寸
public MutiItemDecoration(MutiItemDecoration.Type type, int dividerSize) {
this.type = type;
this.dividerSize = dividerSize;
}
@Override
public void getItemOffsets(Rect outRect, int itemPosition, RecyclerView parent) {
int spanCount = getSpanCount(parent);
int childCount = parent.getAdapter().getItemCount();
switch (type) {
case ALL:
if (itemPosition % spanCount == 0) {//第一列
if (isLastRaw(parent, itemPosition, spanCount, childCount)) {
outRect.set(0, 0, dividerSize / 2, 0);
} else {
outRect.set(0, 0, dividerSize / 2, dividerSize);
}
} else if (itemPosition % spanCount == spanCount - 1) {//最后一列
if (isLastRaw(parent, itemPosition, spanCount, childCount)) {
outRect.set(dividerSize / 2, 0, 0, 0);
} else {
outRect.set(dividerSize / 2, 0, 0, dividerSize);
}
} else {//中間列
if (isLastRaw(parent, itemPosition, spanCount, childCount)) {
outRect.set(dividerSize / 2, 0, dividerSize / 2, 0);
} else {
outRect.set(dividerSize / 2, 0, dividerSize / 2, dividerSize);
}
}
break;
case VERTICAL:
if (isLastRaw(parent, itemPosition, spanCount, childCount)) {
outRect.set(0, 0, 0, 0);
} else {
outRect.set(0, 0, 0, dividerSize);
}
break;
case HORIZONTAL:
if (isLastColum(parent, itemPosition, spanCount, childCount)) {
outRect.set(0, 0, 0, 0);
} else {
outRect.set(0, 0, dividerSize, 0);
}
break;
}
}
// 是否是最后一列
private boolean isLastColum(RecyclerView parent, int pos, int spanCount, int childCount) {
RecyclerView.LayoutManager layoutManager = parent.getLayoutManager();
if (layoutManager instanceof GridLayoutManager) {
if ((pos + 1) % spanCount == 0)
return true;
} else {
if (pos == childCount - 1)
return true;
}
return false;
}
// 是否是最后一行
private boolean isLastRaw(RecyclerView parent, int pos, int spanCount, int childCount) {
RecyclerView.LayoutManager layoutManager = parent.getLayoutManager();
if (layoutManager instanceof GridLayoutManager) {
childCount = childCount - childCount % spanCount;
if (pos >= childCount)
return true;
} else {
if (pos == childCount - 1)
return true;
}
return false;
}
//返回列數(shù)
private int getSpanCount(RecyclerView parent) {
RecyclerView.LayoutManager layoutManager = parent.getLayoutManager();
if (layoutManager instanceof GridLayoutManager) {
return ((GridLayoutManager) layoutManager).getSpanCount();
}
return -1;
}
}
方法三：（目前只支持2列）
public class DividerGridItemDecoration extends RecyclerView.ItemDecoration {
private static final int[] ATTRS = new int[]{android.R.attr.listDivider};
private Drawable mDivider;
public DividerGridItemDecoration(Context context) {
final TypedArray a = context.obtainStyledAttributes(ATTRS);
mDivider = ContextCompat.getDrawable(context, R.drawable.shape_divider);
a.recycle();
}
@Override
public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {
drawHorizontal(c, parent);
drawVertical(c, parent);
}
private int getSpanCount(RecyclerView parent) {
// 列數(shù)
int spanCount = -1;
RecyclerView.LayoutManager layoutManager = parent.getLayoutManager();
if (layoutManager instanceof GridLayoutManager) {
spanCount = ((GridLayoutManager) layoutManager).getSpanCount();
} else if (layoutManager instanceof StaggeredGridLayoutManager) {
spanCount = ((StaggeredGridLayoutManager) layoutManager)
.getSpanCount();
}
return spanCount;
}
public void drawHorizontal(Canvas c, RecyclerView parent) {
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.getLeft() - params.leftMargin;
final int right = child.getRight() + params.rightMargin
+ mDivider.getIntrinsicWidth();
final int top = child.getBottom() + params.bottomMargin;
final int bottom = top + mDivider.getIntrinsicHeight();
mDivider.setBounds(left, top, right, bottom);
mDivider.draw(c);
}
}
public void drawVertical(Canvas c, RecyclerView parent) {
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();
if (i % 2 == 1) {
final int top = child.getTop() - params.topMargin;
final int bottom = child.getBottom() + params.bottomMargin;
final int left = child.getLeft() - params.rightMargin;
final int right = left + mDivider.getIntrinsicWidth() / 2;
mDivider.setBounds(left, top, right, bottom);
mDivider.draw(c);
} else {
final int top = child.getTop() - params.topMargin;
final int bottom = child.getBottom() + params.bottomMargin;
final int left = child.getRight() + params.rightMargin;
final int right = left + mDivider.getIntrinsicWidth() / 2;
mDivider.setBounds(left, top, right, bottom);
mDivider.draw(c);
}
final int top = child.getTop() - params.topMargin;
final int bottom = child.getBottom() + params.bottomMargin;
final int left = child.getRight() + params.rightMargin;
final int right = left + mDivider.getIntrinsicWidth();
mDivider.setBounds(left, top, right, bottom);
mDivider.draw(c);
}
}
private boolean isLastColum(RecyclerView parent, int pos, int spanCount,
int childCount) {
RecyclerView.LayoutManager layoutManager = parent.getLayoutManager();
if (layoutManager instanceof GridLayoutManager) {
if ((pos + 1) % spanCount == 0)// 如果是最后一列，則不需要繪制右邊
{
return true;
}
} else if (layoutManager instanceof StaggeredGridLayoutManager) {
int orientation = ((StaggeredGridLayoutManager) layoutManager)
.getOrientation();
if (orientation == StaggeredGridLayoutManager.VERTICAL) {
if ((pos + 1) % spanCount == 0)// 如果是最后一列，則不需要繪制右邊
{
return true;
}
} else {
childCount = childCount - childCount % spanCount;
if (pos >= childCount)// 如果是最后一列，則不需要繪制右邊
return true;
}
}
return false;
}
private boolean isLastRaw(RecyclerView parent, int pos, int spanCount,
int childCount) {
RecyclerView.LayoutManager layoutManager = parent.getLayoutManager();
if (layoutManager instanceof GridLayoutManager) {
childCount = childCount - childCount % spanCount;
if (pos >= childCount)// 如果是最后一行，則不需要繪制底部
return true;
} else if (layoutManager instanceof StaggeredGridLayoutManager) {
int orientation = ((StaggeredGridLayoutManager) layoutManager)
.getOrientation();
// StaggeredGridLayoutManager 且縱向滾動
if (orientation == StaggeredGridLayoutManager.VERTICAL) {
childCount = childCount - childCount % spanCount;
// 如果是最后一行，則不需要繪制底部
if (pos >= childCount)
return true;
} else
// StaggeredGridLayoutManager 且橫向滾動
{
// 如果是最后一行，則不需要繪制底部
if ((pos + 1) % spanCount == 0) {
return true;
}
}
}
return false;
}
@Override
public void getItemOffsets(Rect outRect, int itemPosition,
RecyclerView parent) {
int spanCount = getSpanCount(parent);
int childCount = parent.getAdapter().getItemCount();
if (isLastRaw(parent, itemPosition, spanCount, childCount))// 如果是最后一行，則不需要繪制底部
{
outRect.set(0, 0, mDivider.getIntrinsicWidth(), 0);
} else if (isLastColum(parent, itemPosition, spanCount, childCount))// 如果是最后一列，則不需要繪制右邊
{
outRect.set(0, 0, 0, mDivider.getIntrinsicHeight());
} else {
outRect.set(0, 0, mDivider.getIntrinsicWidth(),
mDivider.getIntrinsicHeight());
}
}
}
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腳本之家。
您可能感興趣的文章:
- Android RecycleView使用（CheckBox全選、反選、單選）
- Android 中RecycleView實現(xiàn)item的點擊事件
- Android recycleView的應用和點擊事件實例詳解
- Android ListView與RecycleView的對比使用解析
- Android App中ViewPager所帶來的滑動沖突問題解決方法
- Android中DrawerLayout+ViewPager滑動沖突的解決方法
- 淺談Viewpager和輪播圖的沖突解決方法
- Android 中SwipeRefreshLayout與ViewPager滑動事件沖突解決方法
- Android解決viewpager嵌套滑動沖突并保留側滑菜單功能
- Android中RecycleView與ViewPager沖突的解決方法及原理
相關文章
Android判斷網(wǎng)絡類型的方法(2g,3g還是wifi)
這篇文章主要介紹了Android判斷網(wǎng)絡類型的方法,可實現(xiàn)判斷2g,3g還是wifi的功能,結合實例形式分析了Android針對網(wǎng)絡類型的相關判定技巧,需要的朋友可以參考下2016-02-02
這篇文章主要介紹了Android Studio導入so文件到項目中的實例詳解的相關資料,希望通過本文能幫助到大家，需要的朋友可以參考下2017-09-09
這篇文章主要為大家介紹了Gradle屬性設置及環(huán)境變量的全面教程，有需要的朋友可以借鑒參考下，希望能夠有所幫助，祝大家多多進步，早日升職加薪2023-06-06
Android7.0指紋服務FingerprintService實例介紹
這篇文章主要介紹了Android7.0指紋服務FingerprintService介紹,需要的朋友可以參考下2018-01-01
這篇文章主要為大家詳細介紹了OpenGL Shader實例分析第2篇，繪制心臟跳動效果，具有一定的參考價值，感興趣的小伙伴們可以參考一下2019-02-02
這篇文章主要介紹了Jsoup 抓取頁面的數(shù)據(jù)實例詳解的相關資料,需要的朋友可以參考下2016-12-12
這篇文章主要給大家介紹了關于android布局優(yōu)化的一些實用建議，文中通過示例代碼介紹的非常詳細，對大家的學習或者工作具有一定的參考學習價值，需要的朋友們下面隨著小編來一起學習學習吧2021-05-05
這篇文章主要介紹了Android 判斷當前網(wǎng)絡是否可用簡單實例的相關資料,需要的朋友可以參考下2017-06-06
Android模擬器"Failed To Allocate memory 8"錯誤如何解決
這篇文章主要介紹了Android模擬器"Failed To Allocate memory 8"錯誤如何解決的相關資料,需要的朋友可以參考下2017-03-03
android中DatePicker和TimePicker的使用方法詳解
這篇文章主要介紹了android中DatePicker和TimePicker的使用方法,是Android中常用的功能,需要的朋友可以參考下2014-07-07