是时候用RecyclerView来替换ListView和GridView了
好处就不多说了，百度一搜一大把，来介绍下用法
先定义个适配器：
public class BottomSheetAdapter extends RecyclerView.Adapter<BottomSheetAdapter.MyViewHolder> {
private Context context;
private String[] datas;
private int [] icons;
private OnItemClickListener mListener;
public BottomSheetAdapter(Context context,String[] datas,int[] icons){
this.context=context;
this.datas=datas;
this.icons=icons;
}
@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v= LayoutInflater.from(context).inflate(R.layout.bottom_recycle_layout,null);
MyViewHolder holder=new MyViewHolder(v);
return holder;
}
@Override
public void onBindViewHolder(MyViewHolder holder, final int position) {
holder.icon.setImageResource(icons[position]);
holder.title.setText(datas[position]);
holder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(mListener!=null){
mListener.OnClick(position);
}
}
});
holder.itemView.setOnLongClickListener(new View.OnLongClickListener() {
@Override
public boolean onLongClick(View v) {
if(mListener!=null){
mListener.OnLongClick(position);
}
return false;
}
});
}
@Override
public int getItemCount() {
return datas.length;
}
class MyViewHolder extends RecyclerView.ViewHolder {
@BindView(R.id.icon)
public ImageView icon;
@BindView(R.id.title)
public TextView title;
public MyViewHolder(View v){
super(v);
ButterKnife.bind(this,v);
}
}
//recyclerView 没有点击监听，所以要自己定义
public interface OnItemClickListener{
void OnClick(int position);
void OnLongClick(int position);
}
public void setOnItemClickListener(OnItemClickListener listener){
this.mListener=listener;
}
}
使用：
View bottom= LayoutInflater.from(context).inflate(R.layout.bottom_sheet_layout,null);
RecyclerView recyclerView= (RecyclerView) bottom.findViewById(R.id.recycle);
String[] datas=new String[]{"相机","从图片中选取","取消"};
int[] icons=new int[]{R.mipmap.camera,R.mipmap.picture,R.mipmap.cancle};
BottomSheetAdapter adapter=new BottomSheetAdapter(context,datas,icons);
adapter.setOnItemClickListener(new BottomSheetAdapter.OnItemClickListener() {
@Override
public void OnClick(int position) {
switch (position){
case 0:
dialog.hide();
((NoteAddActivity)context).openCamera();
break;
case 1:
dialog.hide();
((NoteAddActivity)context).openGallery();
break;
case 2:
dialog.hide();
break;
default:
break;
}
}
@Override
public void OnLongClick(int position) {
Snackbar.make(finalConvertView,"onlongclcik="+position,Snackbar.LENGTH_SHORT).show();
}
});
recyclerView.setAdapter(adapter);
recyclerView.addItemDecoration(new DividerItemDecoration(context,LinearLayoutManager.VERTICAL));
recyclerView.setLayoutManager(new LinearLayoutManager(context));
dialog.setContentView(bottom);
dialog.show();
分割线需要自己定义，抄两个过来：
listview的分割
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) {
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);
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);
}
}
}
gridview的分割
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 = a.getDrawable(0);
a.recycle();
}
@Override
public void onDraw(Canvas c, RecyclerView parent, State state)
{
drawHorizontal(c, parent);
drawVertical(c, parent);
}
private int getSpanCount(RecyclerView parent)
{
// 列数
int spanCount = -1;
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)
{
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)
{
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());
}
}
}
具体参考：http://blog.csdn.net/lmj623565791/article/details/45059587
时间： 2024-11-04 11:26:24