編輯:關於Android編程
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控件的繼承者,在最新的support-V7版本中提供支持。RecyclerView架構,提供了一種插拔式的體驗,高度的解耦,異常的靈活,通過設置它提供的不同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'
//設置RecyclerView的適配器 adapter = new MyRecyclerViewAdapter(RecyclerViewActivity.this,datas); recyclerview.setAdapter(adapter); //LayoutManager recyclerview.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)); //設置動畫 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的創建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.設置ListView&GridView&瀑布流類型效果
//設置List類型效果 recyclerview.setLayoutManager(new LinearLayoutManager(RecyclerViewActivity.this,LinearLayoutManager.VERTICAL,false)); //設置Grid類型效果 recyclerview.setLayoutManager(new GridLayoutManager(RecyclerViewActivity.this, 2, GridLayoutManager.VERTICAL, false)); //recyclerview.scrollToPosition(99); //設置瀑布流類型效果 recyclerview.setLayoutManager(new StaggeredGridLayoutManager(3,StaggeredGridLayoutManager.VERTICAL));
4.分割線
參照網址:http://blog.csdn.net/lmj623565791/article/details/45059587
//設置分割線-分割線需要自定義&還可以自定義分割線的樣式 //沒有提供默認的分割線 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
設置分割線樣式:
①application設置
<!-- 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.自定義設置item的點擊事件
RecyclerView默認是沒有點擊事件的,需要自定義點擊事件
用到知識點:接口,getLayoutPosition()
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder>{ private final Context context; private final ArrayList<String> datas; //設置點擊某個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; } //設置點擊圖片 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); //設置點擊事件 itemView.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if(onItemClickListener != null){ onItemClickListener.onItemClick(v,getLayoutPosition(),datas.get(getLayoutPosition())); } } }); //設置監聽 iv_icon.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if(onImageViewClickListener != null){ onImageViewClickListener.onImageViewClick(v,getLayoutPosition()); } } }); } } }
在Activity中使用自定義的點擊事件
//設置點擊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(); } }); //設置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.刪除和增加數據
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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