随笔（二十八）
https://github.com/cundong/HeaderAndFooterRecyclerView
2.
给Grid方式排列的RecyclerView添加间距
https://blog.csdn.net/laxian2009/article/details/72824594
https://www.jb51.net/article/86235.htm
https://blog.csdn.net/lmj623565791/article/details/45059587
3.header的RecyclerView右侧没占满
‘
header = LayoutInflater.from(SearchActivity.this).inflate(R.layout.layout_search_main, (ViewGroup) findViewById(android.R.id.content), false);
//header = ViewGroup.inflate(SearchActivity.this, R.layout.layout_search_main, null);
https://blog.csdn.net/ccfcccfc/article/details/40984971
public class DividerGridItemDecoration extends RecyclerView.ItemDecoration
{
private Drawable mDivider;
public DividerGridItemDecoration(Context context)
{
mDivider = ContextCompat.getDrawable(context, R.drawable.divider_quote_dark);
}
@Override
public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state)
{
drawHorizontal(c, parent);
drawVertical(c, parent);
}
private int getSpanCount(RecyclerView parent)
{
// 列数
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();
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，则不需要绘制右边
{
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，则不需要绘制右边
{
return true;
}
} else
{
childCount = childCount - childCount % spanCount;
if (pos >= childCount)// 如果是最后一列，则不需要绘制右边
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，则不需要绘制底部
return true;
} else if (layoutManager instanceof StaggeredGridLayoutManager)
{
int orientation = ((StaggeredGridLayoutManager) layoutManager)
.getOrientation();
// StaggeredGridLayoutManager 且纵向滚动
if (orientation == StaggeredGridLayoutManager.VERTICAL)
{
childCount = childCount - childCount % spanCount;
// 如果是最后一行，则不需要绘制底部
if (pos >= childCount)
return true;
} else
// StaggeredGridLayoutManager 且横向滚动
{
// 如果是最后一行，则不需要绘制底部
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，则不需要绘制底部
{
outRect.set(0, 0, mDivider.getIntrinsicWidth(), 0);
} else if (isLastColum(parent, itemPosition, spanCount, childCount))// 如果是最后一列，则不需要绘制右边
{
outRect.set(0, 0, 0, mDivider.getIntrinsicHeight());
} else
{
outRect.set(0, 0, mDivider.getIntrinsicWidth(),
mDivider.getIntrinsicHeight());
}
}
}
<?xml version="1.0" encoding="UTF-8"?>
4.
理解Android Architecture Components系列（一）
https://www.jianshu.com/p/42eb71ec4a19
https://xuyonghong.cn/2018/09/03/Android-JetPack-ViewModel/
5.带箭头的popwindow列表
https://github.com/zyyoona7/EasyPopup
http://www.jcodecraeer.com/a/opensource/2017/0810/8363.html
mQQPop = EasyPopup.create()
.setContext(this)
.setContentView(R.layout.layout_right_pop)
.setAnimationStyle(R.style.RightTop2PopAnim)
.setOnViewListener(new EasyPopup.OnViewListener() {
@Override
public void initViews(View view, EasyPopup basePopup) {
View arrowView = view.findViewById(R.id.v_arrow);
arrowView.setBackground(new TriangleDrawable(TriangleDrawable.TOP, Color.parseColor("#88FF88")));
}
})
.setFocusAndOutsideEnable(true)
// .setBackgroundDimEnable(true)
// .setDimValue(0.5f)
// .setDimColor(Color.RED)
// .setDimView(mTitleBar)
.apply();
<View
android:id="@+id/v_arrow"
android:layout_width="20dp"
android:layout_height="10dp"
android:layout_gravity="start"
android:layout_marginEnd="10dp"
android:layout_marginRight="10dp"/>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#88FF88"
android:divider="@drawable/divider_horizontal_bg"
android:gravity="center_horizontal"
android:orientation="vertical"
android:showDividers="middle">
<TextView
android:layout_width="match_parent"
android:layout_height="30dp"
android:layout_marginLeft="50dp"
android:layout_marginRight="50dp"
android:gravity="center"
android:text="one"
android:textSize="14sp"/>
<TextView
android:layout_width="match_parent"
android:layout_height="30dp"
android:gravity="center"
android:text="two"
android:textSize="14sp"/>
<TextView
android:layout_width="match_parent"
android:layout_height="30dp"
android:gravity="center"
android:text="three"
android:textSize="14sp"/>
<TextView
android:layout_width="match_parent"
android:layout_height="30dp"
android:gravity="center"
android:text="four"
android:textSize="14sp"/>
<TextView
android:layout_width="match_parent"
android:layout_height="30dp"
android:gravity="center"
android:text="five"
android:textSize="14sp"/>
</LinearLayout>