RecyclerView 以及 ItemClickListener的实现
RecyclerView 的一些基本知识点，可以去官网上查看到。现在这些只是个人的一些笔记而已。
1.Item 位置 ---------- LayoutManager
Item 分割线 --------- ItemDecoration
Item 动画效果 ------- ItemAnimator
2、自定义分割线
1)、在drawable 中定义已shape为root 的xml文件
2）、在style中引用
3、Item增加、删除调用的方法
notifyItemInserted() notifyItemRemove()
4、Item 的点击事件需要自己定义实现
具体的实现：
1、在build.gradle 中增加
dependencies { compile fileTree(dir: 'libs', include: ['*.jar']) compile 'com.android.support:appcompat-v7:22.1.1' compile 'com.android.support:recyclerview-v7:22.1.1' }
2、RecyclerViewActivity
public class RecyclerViewActivity extends AppCompatActivity {
private RecyclerView mRecyclerView;
private List<String> mStringList;
private MyRecyclerViewAdapter mRecyclerViewAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_recycler_view);
initDates();
initView();
mRecyclerViewAdapter = new MyRecyclerViewAdapter(this, mStringList);
mRecyclerView.setAdapter(mRecyclerViewAdapter);
// 设置RecyclerView的方向
LinearLayoutManager manager = new LinearLayoutManager(this, LinearLayout.VERTICAL, false);
mRecyclerView.setLayoutManager(manager);
// 设置RecyclerView的分割线
DividerItemDecoration dividerItemDecoration = new DividerItemDecoration(this, LinearLayout.VERTICAL);
mRecyclerView.addItemDecoration(dividerItemDecoration);
// 设置RecyclerView添加或删除的动画
ScaleInAnimator animator = new ScaleInAnimator();
mRecyclerView.setItemAnimator(animator);
// 设置RecyclerView 的点击事件
mRecyclerView.addOnItemTouchListener(
new RecyclerItemClickListener(RecyclerViewActivity.this, mRecyclerView, new RecyclerItemClickListener.OnItemClickListener() {
@Override
public void onItemClick(View view, int position) {
Toast.makeText(RecyclerViewActivity.this, "item click position: " + position , Toast.LENGTH_SHORT).show();
}
@Override
public void onItemLongClick(View view, int position) {
Toast.makeText(RecyclerViewActivity.this, "item long click position: " + position , Toast.LENGTH_SHORT).show();
}
})
);
}
// 初始化数据
private void initDates(){
mStringList = new ArrayList<>();
for (int i = 'A'; i <= 'z'; i ++){
mStringList.add("" + (char)i);
}
}
// 初始化视图
private void initView(){
mRecyclerView = (RecyclerView) findViewById(R.id.recycler_view);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.menu_recycler_view, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()){
case R.id.action_add:
mRecyclerViewAdapter.add(4);
return true;
case R.id.action_deleted:
mRecyclerViewAdapter.deleted(1);
return true;
}
return super.onOptionsItemSelected(item);
}
}
其中我们的Adapter需要继承RecyclerView的Adapter
2.MyRecyclerViewAdapter.java
public class MyRecyclerViewAdapter extends RecyclerView.Adapter<MyViewHolder> {
private Context mContext;
private List<String> mStringList;
private LayoutInflater mLayoutInflater;
public MyRecyclerViewAdapter(Context context, List<String> list) {
mContext = context;
mStringList = list;
mLayoutInflater = LayoutInflater.from(context);
}
@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
Log.i("yxh", "onCreateViewHolder: ");
View view = mLayoutInflater.inflate(R.layout.item_recycler_view, parent, false);
MyViewHolder viewHolder = new MyViewHolder(view);
return viewHolder;
}
@Override
public void onBindViewHolder(MyViewHolder holder, int position) {
holder.tv_recycler_view.setText(mStringList.get(position));
}
@Override
public int getItemCount() {
Log.i("yxh", "getItemCount: " + mStringList.size());
return mStringList.size();
}
public void add(int position){
mStringList.add(position, "Add One");
notifyItemInserted(position); // notifyDateChanged()
}
public void deleted(int position){
mStringList.remove(position);
notifyItemRemoved(position);
}
}
class MyViewHolder extends RecyclerView.ViewHolder {
TextView tv_recycler_view;
public MyViewHolder(View itemView) {
super(itemView);
tv_recycler_view = (TextView) itemView.findViewById(R.id.tv_item_recycler_view);
}
}
3、Item的分割线需要自定义，所以，这是在网上找到的。
DividerItemDecoration.java
public class DividerItemDecoration extends RecyclerView.ItemDecoration {
private static final int[] ATTRS = new int[]{android.R.attr.listDivider}; // 通过获取theme，而获取lineDivider
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); // 通过获取theme，而获取lineDivider
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);
RecyclerView v = new 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);
}
}
}
然后在RecyclerViewActivity中使用
// 设置RecyclerView的分割线
DividerItemDecoration dividerItemDecoration = new DividerItemDecoration(this, LinearLayout.VERTICAL);
mRecyclerView.addItemDecoration(dividerItemDecoration);
4、Item的增加与删除的东西效果可以使用默认的，也可以使用自定义，github上就用已经有开源的可用https://github.com/wasabeef/recyclerview-animators
所以，我们就直接拿来用就好了
// 设置RecyclerView添加或删除的动画
ScaleInAnimator animator = new ScaleInAnimator();
mRecyclerView.setItemAnimator(animator);
5、RecyclerView没有提供Item的方法，所以，需要我们自己去实现。 不过，也可以在网上找例子，我自己整理了一下。
通过继承RecyclerView.onItemTouchListener 我们可以自定义item的点击以及长按效果
RecyclerItemClickListener.java
**
* Created by Administrator on 2015/9/17.
* 创建RecyclerView的Item点击类
* 网址：http://sapandiwakar.in/recycler-view-item-click-handler/
* http://stackoverflow.com/questions/24471109/recyclerview-onclick/26826692#26826692
* http://www.littlerobots.nl/blog/Handle-Android-RecyclerView-Clicks/
*/
public class RecyclerItemClickListener implements RecyclerView.OnItemTouchListener {
public interface OnItemClickListener{
void onItemClick(View view, int position);
void onItemLongClick(View view, int position);
}
GestureDetector mGestureDetector;
private OnItemClickListener mItemClickListener;
public RecyclerItemClickListener(Context context, final RecyclerView view, OnItemClickListener listener){
mItemClickListener = listener;
mGestureDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener(){
@Override
public boolean onSingleTapUp(MotionEvent e) {
return true;
}
@Override
public void onLongPress(MotionEvent e) {
View childView = view.findChildViewUnder(e.getX(), e.getY());
if (childView != null && mItemClickListener != null){
mItemClickListener.onItemLongClick(view, view.getChildAdapterPosition(childView));
}
}
});
}
@Override
public boolean onInterceptTouchEvent(RecyclerView view, MotionEvent e) {
View childView = view.findChildViewUnder(e.getX(), e.getY());
if (childView != null && mItemClickListener != null && mGestureDetector.onTouchEvent(e)) {
mItemClickListener.onItemClick(view, view.getChildAdapterPosition(childView));
}
return false;
}
@Override
public void onTouchEvent(RecyclerView rv, MotionEvent e) {
}
}
在RecyclerViewActivity中使用
// 设置RecyclerView 的点击事件
mRecyclerView.addOnItemTouchListener(
new RecyclerItemClickListener(RecyclerViewActivity.this, mRecyclerView, new RecyclerItemClickListener.OnItemClickListener() {
@Override
public void onItemClick(View view, int position) {
Toast.makeText(RecyclerViewActivity.this, "item click position: " + position , Toast.LENGTH_SHORT).show();
}
@Override
public void onItemLongClick(View view, int position) {
Toast.makeText(RecyclerViewActivity.this, "item long click position: " + position , Toast.LENGTH_SHORT).show();
}
})
);