IT工程師數位筆記本

1 <?xml version="1.0" encoding="utf-8"?>
2 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
3     android:id="@+id/activity_main"
4     android:layout_width="match_parent" android:layout_height="match_parent">
5 
6     <android.support.v7.widget.RecyclerView android:id="@+id/gr_id"
7         android:layout_width="match_parent" android:layout_height="match_parent"/>
8 </RelativeLayout>

 1 public class MainActivity extends AppCompatActivity {
 2 
 3     @Override
 4     protected void onCreate(Bundle savedInstanceState) {
 5         super.onCreate(savedInstanceState);
 6         setContentView(R.layout.activity_main);
 7 
 8         RecyclerView recyclerView = (RecyclerView) findViewById(R.id.gr_id);
 9         //設置布局管理器
10         recyclerView.setLayoutManager(new StaggeredGridLayoutManager(3,StaggeredGridLayoutManager.VERTICAL));
11         //添加分隔符
12         recyclerView.addItemDecoration(new DividerGridItemDecoration(this));
13 
14         MyAdapter adapter = new MyAdapter(this, Arrays.asList(ImageUrlArrays.IMAGE_URL_ARRAYS));
15         //設置Adapter
16         recyclerView.setAdapter(adapter);
17 
18         //為子條目設置點擊事件
19         adapter.setOnRecyclerViewItemViewListener(new RecyclerViewItemViewListener() {
20             @Override
21             public void onClickListener(RecyclerView.ViewHolder viewHolder, int position) {
22                 Toast.makeText(MainActivity.this, "點擊事件："+position, Toast.LENGTH_SHORT).show();
23             }
24 
25             @Override
26             public void onLongClickListener(RecyclerView.ViewHolder viewHolder, int position) {
27                 Toast.makeText(MainActivity.this, "長按事件："+position, Toast.LENGTH_SHORT).show();
28             }
29         });
30     }
31 
32     @Override
33     public boolean onCreateOptionsMenu(Menu menu) {
34         getMenuInflater().inflate(R.menu.main,menu);
35         return super.onCreateOptionsMenu(menu);
36     }
37 
38     @Override
39     public boolean onOptionsItemSelected(MenuItem item) {
40         switch (item.getItemId()){
41             case R.id.clear_disk://清除硬盤緩存
42                 Toast.makeText(this, "清除硬盤緩存!", Toast.LENGTH_SHORT).show();
43                 WXHLImageLoader.getInstance().clearDiskCache();
44                 break;
45             case R.id.clear_id://清除內存緩存
46                 Toast.makeText(this, "清除內存緩存!", Toast.LENGTH_SHORT).show();
47                 WXHLImageLoader.getInstance().clearMemoryCache();
48                 break;
49         }
50         return super.onOptionsItemSelected(item);
51     }
52 }

  1 class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder>{
  2 
  3     private Context context;
  4     private List<String> list;
  5     private List<Integer> heightList;
  6     private RecyclerViewItemViewListener listener ;
  7 
  8     public MyAdapter(Context context, List<String> list) {
  9         this.context = context;
 10         this.list = list;
 11 
 12         heightList = new ArrayList<>();
 13         for (int i = 0; i < list.size() ; i++) {
 14             int height = (int) (Math.random()*400 + 400);
 15             heightList.add(height);
 16         }
 17 
 18     }
 19 
 20     /**
 21      * 給itemView監聽器賦值
 22      * @param listener
 23      */
 24     public void setOnRecyclerViewItemViewListener(RecyclerViewItemViewListener listener){
 25         this.listener = listener;
 26     }
 27 
 28     int i = 0;
 29     /**
 30      * 創建ViewHolder對contentView進行復用
 31      * @param parent
 32      * @param viewType
 33      * @return
 34      */
 35     @Override
 36     public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
 37         i++;
 38         L.e("----------------onCreateViewHolder-----------i:"+i);
 39         View contentView = LayoutInflater.from(context).inflate(R.layout.activity_main_item,parent,false);
 40         return new ViewHolder(contentView);
 41     }
 42 
 43     /**
 44      * 進行數據綁定，itemView設置數據
 45      * @param holder
 46      * @param position
 47      */
 48     @Override
 49     public void onBindViewHolder(ViewHolder holder, int position) {
 50 
 51         //改變holder.button的高度
 52         int height = heightList.get(position);
 53         ViewGroup.LayoutParams lp = holder.imageView.getLayoutParams();
 54         lp.height = height;
 55         holder.imageView.setLayoutParams(lp);
 56 
 57         L.e("----------------onBindViewHolder-----------position："+position);
 58         WXHLImageLoader.getInstance().displayImage(list.get(position),holder.imageView);
 59         holder.setPosition(position);
 60     }
 61 
 62     @Override
 63     public int getItemCount() {
 64         return list.size();
 65     }
 66 
 67 
 68     class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener,View.OnLongClickListener{
 69         ImageView imageView;
 70         private int position;
 71 
 72         public ViewHolder(View itemView) {
 73             super(itemView);
 74             //為ViewHolder中的組件進行賦值
 75             imageView = (ImageView) itemView.findViewById(R.id.id_but);
 76 
 77             if(listener != null){//判斷RecyclerViewItemViewListener是否為空，
 78                                 // 若為空，不能給子條目設置點擊事件，否則會出現空指針
 79                 itemView.setOnClickListener(this);
 80                 itemView.setOnLongClickListener(this);
 81             }
 82         }
 83 
 84         public void setPosition(int position) {
 85             this.position = position;
 86         }
 87 
 88         @Override
 89         public void onClick(View v) {
 90             switch (v.getId()){
 91                 case R.id.item_id://itemView的點擊事件
 92                     listener.onClickListener(this,position);
 93                     break;
 94             }
 95         }
 96 
 97         @Override
 98         public boolean onLongClick(View v) {//itemView的長按事件
 99             listener.onLongClickListener(this,position);
100             return true;
101         }
102     }
103 }

 1 public interface RecyclerViewItemViewListener {
 2 
 3     /**
 4      * itemView的點擊事件
 5      * @param viewHolder
 6      * @param position
 7      */
 8     void onClickListener(RecyclerView.ViewHolder viewHolder, int position);
 9 
10     /**
11      * 是itemView的長按事件
12      * @param viewHolder
13      * @param position
14      */
15     void onLongClickListener(RecyclerView.ViewHolder viewHolder, int position);
16 
17 }