package com.example.lenovo.dianzandemo;  import android.content.Context; import android.graphics.drawable.ColorDrawable; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.support.v7.widget.LinearLayoutManager; import android.support.v7.widget.RecyclerView; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ImageView; import android.widget.PopupWindow; import android.widget.TextView; import android.widget.Toast;  public class MainActivity extends AppCompatActivity {    private RecyclerView recyclerView;   private int[] pics;   private String[] descs;   public Context mContext;    @Override   protected void onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     setContentView(R.layout.activity_main);     mContext = getApplicationContext();     pics = new int[]{R.mipmap.test1, R.mipmap.test5, R.mipmap.test6, R.mipmap.test7, R.mipmap.test8, R.mipmap.test9, R.mipmap.test10, R.mipmap.test12, R.mipmap.test13, R.mipmap.test14, R.mipmap.test1, R.mipmap.test5, R.mipmap.test6, R.mipmap.test7, R.mipmap.test8, R.mipmap.test9, R.mipmap.test10, R.mipmap.test12, R.mipmap.test13, R.mipmap.test14};     descs = new String[]{         "詩人承陳隋風流，浮靡相矜。",         "古今詩人眾矣，而杜子美為首，豈非以其流落饑寒，終身不用，而一飯未嘗忘君也歟？",         "老杜詩，凡一篇皆工拙相半，古人文章類如此。",         "王介甫只知巧語之為詩，而不知拙語亦詩也；山谷只知奇語之為詩，而不知常語亦詩也",         "子美詩奄有古今。學者能識國風、騷人之旨，然后知子美用意處",         "或問王荊公云：編四家詩，以杜甫為第一，李白為第四，豈白之才格詞致不逮甫也？",         "山谷云，老杜作詩，退之作文，無一字無來處，蓋后人讀書少，故謂韓、杜自作此語耳。",         "觀杜者不唯見其律，而有見其騷者焉；不唯見其騷，而有見其雅者焉",         "盛唐一味秀麗雄渾。杜則精粗、巨細、巧拙、新陳、險易、淺深、濃淡、肥瘦靡不畢具",         "大概杜有三難：極盛難繼，首創難工，遘衰難挽",         "詩人承陳隋風流，浮靡相矜。",         "古今詩人眾矣，而杜子美為首，豈非以其流落饑寒，終身不用，而一飯未嘗忘君也歟？",         "老杜詩，凡一篇皆工拙相半，古人文章類如此。",         "王介甫只知巧語之為詩，而不知拙語亦詩也；山谷只知奇語之為詩，而不知常語亦詩也",         "子美詩奄有古今。學者能識國風、騷人之旨，然后知子美用意處",         "或問王荊公云：編四家詩，以杜甫為第一，李白為第四，豈白之才格詞致不逮甫也？",         "山谷云，老杜作詩，退之作文，無一字無來處，蓋后人讀書少，故謂韓、杜自作此語耳。",         "觀杜者不唯見其律，而有見其騷者焉；不唯見其騷，而有見其雅者焉",         "盛唐一味秀麗雄渾。杜則精粗、巨細、巧拙、新陳、險易、淺深、濃淡、肥瘦靡不畢具",         "大概杜有三難：極盛難繼，首創難工，遘衰難挽"     };     initView();   }    private void initView() {     recyclerView = (RecyclerView) findViewById(R.id.recycler_view);     recyclerView.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false));      RecyclerAdapter recyclerAdapter = new RecyclerAdapter(pics, descs, mContext);     recyclerView.setAdapter(recyclerAdapter);   }   }   class RecyclerAdapter extends RecyclerView.Adapter<MyViewHolder> {     private Context mContext;   private String[] descs;   private int[] pics;   private PopupWindow mPop;    public RecyclerAdapter(int[] pics, String[] descs, Context context) {     this.pics = pics;     this.descs = descs;     this.mContext = context;   }    @Override   public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {     View view = View.inflate(parent.getContext(), R.layout.item_layout, null);     MyViewHolder viewHolder = new MyViewHolder(view);     return viewHolder;   }    @Override   public void onBindViewHolder(final MyViewHolder holder, final int position) {     holder.desc.setText(descs[position]);     holder.icon.setImageResource(pics[position]);     holder.zan.setOnClickListener(new View.OnClickListener() {        @Override       public void onClick(View v) { //        Toast.makeText(mContext, position + "被點擊了", Toast.LENGTH_SHORT).show();         int zanWidth = holder.zan.getWidth();         int zanHeight = holder.zan.getHeight();         View contentView = LayoutInflater.from(mContext).inflate(R.layout.pop_layout, null);         TextView popZan = (TextView) contentView.findViewById(R.id.pop_zan);         TextView popPinlun = (TextView) contentView.findViewById(R.id.pop_pinlun);         popZan.setOnClickListener(new View.OnClickListener() {           @Override           public void onClick(View v) {             Toast.makeText(mContext, "點贊", Toast.LENGTH_SHORT).show();           }         });         popPinlun.setOnClickListener(new View.OnClickListener() {           @Override           public void onClick(View v) {             Toast.makeText(mContext, "評論", Toast.LENGTH_SHORT).show();           }         });          if (mPop == null) { //優化:當popwindow為空的時候才創建,不為空,直接復用           int width = zanWidth * 5; //設置PopupWindow的寬           int height = zanHeight; //設置PopupWindow的高           boolean focusable = true; //設置PopupWindow可獲取焦點           mPop = new PopupWindow(contentView, width, height, focusable);           //為PopupWindow設置背景,獲取焦點才能生效(谷歌官方要求)           mPop.setBackgroundDrawable(new ColorDrawable());         }         View anchor = holder.zan; //指定PopupWindow在哪個控件下面顯示         int xoff = -zanWidth;//指定PopupWindow在x軸方向上的偏移量         int yoff = -zanHeight;//指定PopupWindow在Y軸方向上的偏移量         mPop.showAsDropDown(anchor, xoff, yoff);       }     });   }    @Override   public int getItemCount() {     return pics.length;   }   }  class MyViewHolder extends RecyclerView.ViewHolder {    public TextView desc;   public ImageView icon;   public ImageView zan;    public MyViewHolder(View itemView) {     super(itemView);     desc = (TextView) itemView.findViewById(R.id.desc);     icon = (ImageView) itemView.findViewById(R.id.icon);     zan = (ImageView) itemView.findViewById(R.id.zan);   } }