RecyclerView简单使用
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RecyclerView是谷歌V7包下新增的控件,用来替代ListView的使用,他可以通过设置LayoutManager来快速实现listview、gridview、瀑布流的效果,而且还可以设置横向和纵向显示,添加动画效果也非常简单(自带了ItemAnimation,可以设置加载和移除时的动画,方便做出各种动态浏览的效果),也是官方推荐使用的
引用:
compile 'com.android.support:cardview-v7:21.0.3'
compile 'com.android.support:recyclerview-v7:21.0.3'
简单使用:
mRecyclerView = findView(R.id.id_recyclerview);
//设置布局管理器
mRecyclerView.setLayoutManager(new LinearLayoutManager(this));//类listview
//mRecyclerView.setLayoutManager(new GridLayoutManager(this, 2));//类gridview
//mRecyclerView.setLayoutManager(new StaggeredGridLayoutManager(2, OrientationHelper.VERTICAL));//类瀑布流
//设置adapter
mRecyclerView.setAdapter(adapter)
//点击事件
需要自定义,有3中方法,目前以在adapter中添加点击为例
adapter:
/** * Created by hp on 2017/2/7. */public class MyListAdapter extends RecyclerView.Adapter<MyListAdapter.MyRecyclerListHolder> { private Context mContext; private List<String> mDatas; private LayoutInflater inflater; public MyListAdapter(Context context, List<String> datas){ this. mContext=context; this. mDatas=datas; inflater=LayoutInflater. from(mContext); }
//添加一个点击事件的接口
public interface OnItemClickLitener{ void onItemClick(View view, int position); void onItemLongClick(View view , int position); } private OnItemClickLitener mOnItemClickLitener; public void setOnItemClickLitener(OnItemClickLitener mOnItemClickLitener) { this.mOnItemClickLitener = mOnItemClickLitener; } @Override public MyRecyclerListHolder onCreateViewHolder(ViewGroup parent, int viewType) { View view = inflater.inflate(R.layout.item_home1, parent, false); MyRecyclerListHolder holder= new MyRecyclerListHolder(view); return holder; } @Override public void onBindViewHolder(final MyRecyclerListHolder holder, int position) { holder.tv.setText(mDatas.get(position)); holder.bb.setText(mDatas.get(position)); // 如果设置了回调,则设置点击事件 if (mOnItemClickLitener != null) {
//holder.itemView.其中iteamView是系统个提供的,表示对应的iteam一整栏,也就是说点击事件绑定的是整个iteam栏
holder.itemView.setOnClickListener(new View.OnClickListener()
//holder.tv.setOnClickListener这个点击事件就绑定为对应的textview控件了
{ @Override public void onClick(View v) { int pos = holder.getPosition(); mOnItemClickLitener.onItemClick(holder.itemView, pos); } }); } } @Override public int getItemCount() { return mDatas.size(); } class MyRecyclerListHolder extends ViewHolder{ TextView tv; Button bb; public MyRecyclerListHolder(View itemView) { super(itemView); tv=(TextView) itemView.findViewById(R.id. id_num); bb = (Button) itemView.findViewById(R.id.bb); } }}
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RecyclerView的分割线:
通过该方法添加分割线: mRecyclerView.addItemDecoration()
//该分割线是系统默认的,你可以在theme.xml中找到该属性的使用情况
mRecyclerView.addItemDecoration(new DividerItemDecoration(this,DividerItemDecoration.VERTICAL_LIST));
添加默认分割线:高度为2px,颜色为灰色
mRecyclerView.addItemDecoration(new RecycleViewDivider(mContext, LinearLayoutManager.VERTICAL));
添加自定义分割线:可自定义分割线drawable
mRecyclerView.addItemDecoration(new RecycleViewDivider(
mContext, LinearLayoutManager.VERTICAL, R.drawable.divider_mileage));
添加自定义分割线:可自定义分割线高度和颜色
mRecyclerView.addItemDecoration(new RecycleViewDivider(
mContext, LinearLayoutManager.VERTICAL, 10, getResources().getColor(R.color.divide_gray_color)));
万能分割线登场:
public class RecycleViewDivider extends RecyclerView.ItemDecoration {
private Paint mPaint;
private Drawable mDivider;
private int mDividerHeight = 2;//分割线高度,默认为1px
private int mOrientation;//列表的方向:LinearLayoutManager.VERTICAL或LinearLayoutManager.HORIZONTAL
private static final int[] ATTRS = new int[]{android.R.attr.listDivider};
/**
* 默认分割线:高度为2px,颜色为灰色
*
* @param context
* @param orientation 列表方向
*/
public RecycleViewDivider(Context context, int orientation) {
if (orientation != LinearLayoutManager.VERTICAL && orientation != LinearLayoutManager.HORIZONTAL) {
throw new IllegalArgumentException("请输入正确的参数!");
}
mOrientation = orientation;
final TypedArray a = context.obtainStyledAttributes(ATTRS);
mDivider = a.getDrawable(0);
a.recycle();
}
/**
* 自定义分割线
*
* @param context
* @param orientation 列表方向
* @param drawableId 分割线图片
*/
public RecycleViewDivider(Context context, int orientation, int drawableId) {
this(context, orientation);
mDivider = ContextCompat.getDrawable(context, drawableId);
mDividerHeight = mDivider.getIntrinsicHeight();
}
/**
* 自定义分割线
*
* @param context
* @param orientation 列表方向
* @param dividerHeight 分割线高度
* @param dividerColor 分割线颜色
*/
public RecycleViewDivider(Context context, int orientation, int dividerHeight, int dividerColor) {
this(context, orientation);
mDividerHeight = dividerHeight;
mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mPaint.setColor(dividerColor);
mPaint.setStyle(Paint.Style.FILL);
}
//获取分割线尺寸
@Override
public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
super.getItemOffsets(outRect, view, parent, state);
outRect.set(0, 0, 0, mDividerHeight);
}
//绘制分割线
@Override
public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {
super.onDraw(c, parent, state);
if (mOrientation == LinearLayoutManager.VERTICAL) {
drawVertical(c, parent);
} else {
drawHorizontal(c, parent);
}
}
//绘制横向 item 分割线
private void drawHorizontal(Canvas canvas, RecyclerView parent) {
final int left = parent.getPaddingLeft();
final int right = parent.getMeasuredWidth() - parent.getPaddingRight();
final int childSize = parent.getChildCount();
for (int i = 0; i < childSize; i++) {
final View child = parent.getChildAt(i);
RecyclerView.LayoutParams layoutParams = (RecyclerView.LayoutParams) child.getLayoutParams();
final int top = child.getBottom() + layoutParams.bottomMargin;
final int bottom = top + mDividerHeight;
if (mDivider != null) {
mDivider.setBounds(left, top, right, bottom);
mDivider.draw(canvas);
}
if (mPaint != null) {
canvas.drawRect(left, top, right, bottom, mPaint);
}
}
}
//绘制纵向 item 分割线
private void drawVertical(Canvas canvas, RecyclerView parent) {
final int top = parent.getPaddingTop();
final int bottom = parent.getMeasuredHeight() - parent.getPaddingBottom();
final int childSize = parent.getChildCount();
for (int i = 0; i < childSize; i++) {
final View child = parent.getChildAt(i);
RecyclerView.LayoutParams layoutParams = (RecyclerView.LayoutParams) child.getLayoutParams();
final int left = child.getRight() + layoutParams.rightMargin;
final int right = left + mDividerHeight;
if (mDivider != null) {
mDivider.setBounds(left, top, right, bottom);
mDivider.draw(canvas);
}
if (mPaint != null) {
canvas.drawRect(left, top, right, bottom, mPaint);
}
}
}
附:自定的drawable文件一份
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<size android:height="20dp" />
<solid android:color="#ff992900" />
</shape>
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