RecycleView 在实战中所需要的方法 ---- 持续更新
2015-11-29 02:46
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1 RecycleView 通过/位置 id找到所对应的ViewHolder
recyclerView.findViewHolderForAdapterPosition(i);
recyclerView.findViewHolderForItemId()
2 判断RecycleView 是否滑动到最底端
3 动态设置RecycleView的大小 适用于在同一个活动中使用2个recycleview的情况
4 设置recycleview的视图项之间的分割线
先自定义定义一个分割线类
使用
5 设置RecyclerView的滚动条
纵向显示
横向显示
隐藏
recyclerView.findViewHolderForAdapterPosition(i);
recyclerView.findViewHolderForItemId()
2 判断RecycleView 是否滑动到最底端
LinearLayoutManager layoutManager = (LinearLayoutManager) recyclerView.getLayoutManager();
//添加滚动监听器
recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
super.onScrollStateChanged(recyclerView, newState);
// 当不滚动时
if (newState == AbsListView.OnScrollListener.SCROLL_STATE_IDLE) {
// 判断是否滚动到底部
//得到可见视图项最底层id
int lostPos = layoutManager.findLastVisibleItemPosition();
if (lostPos == layoutManager.getItemCount() - 1) {
//Toast.makeText(ShowActivity.this, "最后:" + lostPos, Toast.LENGTH_SHORT).show();
}
}
}
});
3 动态设置RecycleView的大小 适用于在同一个活动中使用2个recycleview的情况
for(int i=0; i<adapter1.getItemCount(); i++) {
View listItem=recyclerView1.findViewHolderForAdapterPosition(i).itemView;
listItem.measure(0, 0);
totalHeight += listItem.getMeasuredHeight();
}
ViewGroup.LayoutParams params = recyclerView1.getLayoutParams();
params.height = totalHeight + (recyclerView1.getDividerHeight() * (listAdapter.getCount() - 1));
//recyclerView1.getDividerHeight()获取子项间分隔符占用的高度
//params.height最后得到整个recyclerView1完整显示需要的高度
recyclerView1.setLayoutParams(params);
4 设置recycleview的视图项之间的分割线
先自定义定义一个分割线类
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.View;
/**
* This class is from the v7 samples of the Android SDK. It's not by me!
* <p/>
* See the license above for details.
*/
public class DividerItemDecoration extends RecyclerView.ItemDecoration {
private static final int[] ATTRS = new int[]{
android.R.attr.listDivider
};
public static final int HORIZONTAL_LIST = LinearLayoutManager.HORIZONTAL;
public static final int VERTICAL_LIST = LinearLayoutManager.VERTICAL;
private Drawable mDivider;
private int mOrientation;
public DividerItemDecoration(Context context, int orientation) {
final TypedArray a = context.obtainStyledAttributes(ATTRS);
mDivider = a.getDrawable(0);
a.recycle();
setOrientation(orientation);
}
public void setOrientation(int orientation) {
if (orientation != HORIZONTAL_LIST && orientation != VERTICAL_LIST) {
throw new IllegalArgumentException("invalid orientation");
}
mOrientation = orientation;
}
@Override
public void onDraw(Canvas c, RecyclerView parent) {
Log.v("recyclerview - itemdecoration", "onDraw()");
if (mOrientation == VERTICAL_LIST) {
drawVertical(c, parent);
} else {
drawHorizontal(c, parent);
}
}
public void drawVertical(Canvas c, RecyclerView parent) {
final int left = parent.getPaddingLeft();
final int right = parent.getWidth() - parent.getPaddingRight();
final int childCount = parent.getChildCount();
for (int i = 0; i < childCount; i++) {
final View child = parent.getChildAt(i);
android.support.v7.widget.RecyclerView v = new android.support.v7.widget.RecyclerView(parent.getContext());
final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
.getLayoutParams();
final int top = child.getBottom() + params.bottomMargin;
final int bottom = top + mDivider.getIntrinsicHeight();
mDivider.setBounds(left, top, right, bottom);
mDivider.draw(c);
}
}
public void drawHorizontal(Canvas c, RecyclerView parent) {
final int top = parent.getPaddingTop();
final int bottom = parent.getHeight() - parent.getPaddingBottom();
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 left = child.getRight() + params.rightMargin;
final int right = left + mDivider.getIntrinsicHeight();
mDivider.setBounds(left, top, right, bottom);
mDivider.draw(c);
}
}
@Override
public void getItemOffsets(Rect outRect, int itemPosition, RecyclerView parent) {
if (mOrientation == VERTICAL_LIST) {
outRect.set(0, 0, 0, mDivider.getIntrinsicHeight());
} else {
outRect.set(0, 0, mDivider.getIntrinsicWidth(), 0);
}
}
}
使用
//添加分割线
recyclerView.addItemDecoration(new DividerItemDecoration(this,
DividerItemDecoration.VERTICAL_LIST));
5 设置RecyclerView的滚动条
纵向显示
android:scrollbars="vertical"
横向显示
android:scrollbars="horizontal"
隐藏
android:scrollbars="none"
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