Android RecyclerView使用方法解析_Android

1.簡介

　　RecyclerView是一種新的視圖組，目標是為任何基於適配器的視圖提供相似的渲染方式。它被作為ListView和GridView控制項的繼承者，在最新的support-V7版本中提供支援。RecyclerView架構，提供了一種插拔式的體驗，高度的解耦，異常的靈活，通過設定它提供的不同LayoutManager，ItemDecoration , ItemAnimator實現令人瞠目的效果。

總之ListView和GridView能做的RecyclerView都能做，並且能實現瀑布流效果

2.使用

在build.gradle配置RecyclerView的庫
compile 'com.android.support:recyclerview-v7:23.3.0'

//設定RecyclerView的適配器adapter = new MyRecyclerViewAdapter(RecyclerViewActivity.this,datas);recyclerview.setAdapter(adapter); //LayoutManagerrecyclerview.setLayoutManager(new LinearLayoutManager(RecyclerViewActivity.this, LinearLayoutManager.VERTICAL, false));// recyclerview.scrollToPosition(datas.size()-1); //添加RecyclerView的分割線recyclerview.addItemDecoration(new DividerListItemDecoration(RecyclerViewActivity.this,DividerListItemDecoration.VERTICAL_LIST)); //設定動畫recyclerview.setItemAnimator(new DefaultItemAnimator());

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {  private final Context context; private final ArrayList<String> datas;  public MyAdapter(Context context,ArrayList<String> datas){ this.context = context; this.datas = datas; } /** * 相當於ListView適配器中的getView的建立holder布局 * * @param parent * @param viewType * @return */ @Override public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { View view = View.inflate(context, R.layout.item_hello, null); return new MyViewHolder(view); }  @Override public void onBindViewHolder(MyViewHolder holder, int position) { holder.tv_text.setText(datas.get(position)); holder.iv_icon.setBackgroundResource(R.mipmap.ic_launcher);  }  @Override public int getItemCount() { return datas.size(); }  class MyViewHolder extends RecyclerView.ViewHolder {  private TextView tv_text; private ImageView iv_icon;  public MyViewHolder(View itemView) {  super(itemView);  tv_text = (TextView) itemView.findViewById(R.id.tv_text);  iv_icon = (ImageView) itemView.findViewById(R.id.iv_icon);  } }}

3.設定ListView&GridView&瀑布流類型效果

//設定List類型效果recyclerview.setLayoutManager(new LinearLayoutManager(RecyclerViewActivity.this,LinearLayoutManager.VERTICAL,false)); //設定Grid類型效果recyclerview.setLayoutManager(new GridLayoutManager(RecyclerViewActivity.this, 2, GridLayoutManager.VERTICAL, false));//recyclerview.scrollToPosition(99); //設定瀑布流類型效果recyclerview.setLayoutManager(new StaggeredGridLayoutManager(3,StaggeredGridLayoutManager.VERTICAL));

4.分割線

參照網址：http://blog.csdn.net/lmj623565791/article/details/45059587

//設定分割線-分割線需要自訂&還可以自訂分割線的樣式//沒有提供預設的分割線recyclerview.addItemDecoration(new DividerListItemDecoration(this, DividerListItemDecoration.VERTICAL_LIST));

public class DividerListItemDecoration 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 DividerListItemDecoration(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.e("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); } }}DividerListItemDecoration

設定分割線樣式：

①application設定

<!-- Base application theme. --><style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar"> <!-- Customize your theme here. --> <item name="colorPrimary">@color/colorPrimary</item> <item name="colorPrimaryDark">@color/colorPrimaryDark</item> <item name="colorAccent">@color/colorAccent</item> <item name="android:listDivider">@drawable/divider_bg</item></style>

②在activity中

<activity android:name=".recyclerview.RecyclerViewActivity" android:theme="@style/listDividerTheme"/><style name="listDividerTheme" parent="Theme.AppCompat.Light.DarkActionBar"> <!-- Customize your theme here. --> <item name="colorPrimary">@color/colorPrimary</item> <item name="colorPrimaryDark">@color/colorPrimaryDark</item> <item name="colorAccent">@color/colorAccent</item> <item name="android:listDivider">@drawable/divider_bg</item></style>

5.自訂設定item的點擊事件

RecyclerView預設是沒有點擊事件的，需要自訂點擊事件
用到知識點：介面，getLayoutPosition()

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder>{  private final Context context; private final ArrayList<String> datas;  //設定點擊某個item的監聽 public interface OnItemClickListener{  void onItemClick(View view,int position,String content); }  private OnItemClickListener onItemClickListener; public void setOnItemClickListener(OnItemClickListener onItemClickListener) { this.onItemClickListener = onItemClickListener; }  //設定點擊圖片 public interface OnImageViewClickListener{ void onImageViewClick(View view,int position); }  private OnImageViewClickListener onImageViewClickListener; public void setOnImageViewClickListener(OnImageViewClickListener onImageViewClickListener) { this.onImageViewClickListener = onImageViewClickListener; }  ...................................  class MyViewHolder extends RecyclerView.ViewHolder {  private TextView tv_text; private ImageView iv_icon;  public MyViewHolder(View itemView) {  super(itemView);  tv_text = (TextView) itemView.findViewById(R.id.tv_text);  iv_icon = (ImageView) itemView.findViewById(R.id.iv_icon);   //設定點擊事件  itemView.setOnClickListener(new View.OnClickListener() {  @Override  public void onClick(View v) {   if(onItemClickListener != null){   onItemClickListener.onItemClick(v,getLayoutPosition(),datas.get(getLayoutPosition()));   }  }  });   //設定監聽  iv_icon.setOnClickListener(new View.OnClickListener() {  @Override  public void onClick(View v) {   if(onImageViewClickListener != null){   onImageViewClickListener.onImageViewClick(v,getLayoutPosition());   }  }  }); } }}

在Activity中使用自訂的點擊事件

//設定點擊item的點擊事件myAdapter.setOnItemClickListener(new MyAdapter.OnItemClickListener() { @Override public void onItemClick(View view, int position, String content) { Toast.makeText(RecyclerViewActivity.this, "content=="+content+",--position=="+position, Toast.LENGTH_SHORT).show(); }}); //設定點擊某張圖片的點擊事件myAdapter.setOnImageViewClickListener(new MyAdapter.OnImageViewClickListener() { @Override public void onImageViewClick(View view, int position) { Toast.makeText(RecyclerViewActivity.this, "position=="+position+",view=="+view.toString(), Toast.LENGTH_SHORT).show(); }});

6.刪除和增加資料

1_在適配器中新增加添加和刪除兩個方法

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {  ........................  public void addData(int position,String content){ datas.add(position,content); notifyItemInserted(position); }  public void removeData(int position){ datas.remove(position); notifyItemRemoved(position); }}

2_Activity中

btn_add.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { myAdapter.addData(0,"Content NetData"); //定位到第0個位置 recyclerview.scrollToPosition(0); }}); btn_remove.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { myAdapter.removeData(0); }});

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