RecyclerView实现分割线、点击事件、条目加载动画

RecyclerView需要导包
public class MainActivity extends AppCompatActivity {
private RecyclerView recy;
private LinearLayoutManager manager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
recy = (RecyclerView) findViewById(R.id.listview);
manager = new LinearLayoutManager(this);
recy.setLayoutManager(manager);
Myapp myapp = new Myapp();
recy.setAdapter(myapp);
myapp.setOnItemClickListener(new Myapp.OnItemClickListener() {
@Override
public void onItemClick(View v, int position) {
Toast.makeText(MainActivity.this, "点击", Toast.LENGTH_SHORT).show();
}
});
recy.addItemDecoration(new MyCustom(this
13b3f
,LinearLayoutManager.VERTICAL));
recy.setItemAnimator(new DefaultItemAnimator());条目加载动画
}
}
Myapp:

public class Myapp extends RecyclerView.Adapter<Myapp.MyViewHolder> {
private final ArrayList<String> list;
public Myapp() {
list = new ArrayList<>();
for (int i = 0; i < 30; i++) {
list.add("条目" + i);
}
}
@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
final View inflate = LayoutInflater.from(parent.getContext()).inflate(R.layout.item, parent,false);
return new MyViewHolder(inflate);
}
public interface OnItemClickListener {
void onItemClick(View v, int position);
}
private OnItemClickListener mOnItemClickListener;
public void setOnItemClickListener(OnItemClickListener itemClickListener) {
mOnItemClickListener = itemClickListener;
}
@Override
public void onBindViewHolder(MyViewHolder holder, final int position) {
holder.tv.setText(list.get(position));
holder.tv.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (mOnItemClickListener!=null){
mOnItemClickListener.onItemClick(v,position);
}
}
});
}
@Override
public int getItemCount() {
return list.size();
}
public class MyViewHolder extends RecyclerView.ViewHolder {
private  TextView tv;
public MyViewHolder(View itemView) {
super(itemView);
tv = (TextView) itemView.findViewById(R.id.tv);
}
}
}

public class MyCustom extends RecyclerView.ItemDecoration {
private Context mContext;
private Drawable mDivider;
private int mOrientation;
public static final int HORIZONTAL_LIST = LinearLayoutManager.HORIZONTAL;
public static final int VERTICAL_LIST = LinearLayoutManager.VERTICAL;
//我们通过获取系统属性中的listDivider来添加，在系统中的AppTheme中设置
public static final int[] ATRRS = new int[]{
android.R.attr.listDivider
};
public MyCustom(Context context, int orientation) {
this.mContext = context;
final TypedArray ta = context.obtainStyledAttributes(ATRRS);
this.mDivider = ta.getDrawable(0);
ta.recycle();
setOrientation(orientation);
}
//设置屏幕的方向
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, RecyclerView.State state) {
if (mOrientation == HORIZONTAL_LIST) {
drawVerticalLine(c, parent, state);
} else {
drawHorizontalLine(c, parent, state);
}
}
//画横线, 这里的parent其实是显示在屏幕显示的这部分
public void drawHorizontalLine(Canvas c, RecyclerView parent, RecyclerView.State state) {
int left = parent.getPaddingLeft();
int right = parent.getWidth() - parent.getPaddingRight();
final int childCount = parent.getChildCount();
for (int i = 0; i < childCount; i++) {
final View child = parent.getChildAt(i);
//获得child的布局信息
final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();
final int top = child.getBottom() + params.bottomMargin;
final int bottom = top + mDivider.getIntrinsicHeight();
mDivider.setBounds(left+params.leftMargin, top, right-params.leftMargin, bottom);
mDivider.draw(c);
//Log.d("wnw", left + " " + top + " "+right+"   "+bottom+" "+i);
}
}
//画竖线
public void drawVerticalLine(Canvas c, RecyclerView parent, RecyclerView.State state) {
int top = parent.getPaddingTop();
int bottom = parent.getHeight() - parent.getPaddingBottom();
final int childCount = parent.getChildCount();
for (int i = 0; i < childCount; i++) {
final View child = parent.getChildAt(i);
//获得child的布局信息
final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();
final int left = child.getRight() + params.rightMargin;
final int right = left + mDivider.getIntrinsicWidth();
mDivider.setBounds(left, top+params.topMargin, right, bottom-params.topMargin);
mDivider.draw(c);
}
}
//由于Divider也有长宽高，每一个Item需要向下或者向右偏移
@Override
public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
if (mOrientation == HORIZONTAL_LIST) {
//画横线，就是往下偏移一个分割线的高度
outRect.set(0, 0, 0, mDivider.getIntrinsicHeight());
} else {
//画竖线，就是往右偏移一个分割线的宽度
outRect.set(0, 0, mDivider.getIntrinsicWidth(), 0);
}
}
}
drawable下：item:

<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<solid android:color="#ff0000" />
<size
android:height="2dp"
android:width="2dp"
/>
</shape>

<item name="android:listDivider">@drawable/item</item>

<android.support.v7.widget.RecyclerView
android:id="@+id/listview"
android:layout_width="match_parent"
android:layout_height="match_parent">
</android.support.v7.widget.RecyclerView>

<TextView
android:id="@+id/tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
/>