这是瀑布流的效果图
RecyclerView（ListView的升级版）
加载图片用的是第三方图片加载框架
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在Xml中
1 25 6 8
这是Activity 初始化组件
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 //设置布局管理器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 //设置Adapter16 recyclerView.setAdapter(adapter);17 18 //为子条目设置点击事件19 adapter.setOnRecyclerViewItemViewListener(new RecyclerViewItemViewListener() {20 @Override21 public void onClickListener(RecyclerView.ViewHolder viewHolder, int position) {22 Toast.makeText(MainActivity.this, "点击事件："+position, Toast.LENGTH_SHORT).show();23 }24 25 @Override26 public void onLongClickListener(RecyclerView.ViewHolder viewHolder, int position) {27 Toast.makeText(MainActivity.this, "长按事件："+position, Toast.LENGTH_SHORT).show();28 }29 });30 }31 32 @Override33 public boolean onCreateOptionsMenu(Menu menu) {34 getMenuInflater().inflate(R.menu.main,menu);35 return super.onCreateOptionsMenu(menu);36 }37 38 @Override39 public boolean onOptionsItemSelected(MenuItem item) {40 switch (item.getItemId()){41 case R.id.clear_disk://清除硬盘缓存42 Toast.makeText(this, "清除硬盘缓存!", Toast.LENGTH_SHORT).show();43 WXHLImageLoader.getInstance().clearDiskCache();44 break;45 case R.id.clear_id://清除内存缓存46 Toast.makeText(this, "清除内存缓存!", Toast.LENGTH_SHORT).show();47 WXHLImageLoader.getInstance().clearMemoryCache();48 break;49 }50 return super.onOptionsItemSelected(item);51 }52 } 需要设置数据就要newAdapter 这个Adapter是必须继承RecyclerView的Adapter 其中还要传入ViewHolder
这个ViewHolder也是要继承RecyclerView的ViewHolder
1 class MyAdapter extends RecyclerView.Adapter{ 2 3 private Context context; 4 private List list; 5 private List heightList; 6 private RecyclerViewItemViewListener listener ; 7 8 public MyAdapter(Context context, List 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 * 给itemView监听器赋值 22 * @param listener 23 */ 24 public void setOnRecyclerViewItemViewListener(RecyclerViewItemViewListener listener){ 25 this.listener = listener; 26 } 27 28 int i = 0; 29 /** 30 * 创建ViewHolder对contentView进行复用 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 * 进行数据绑定，itemView设置数据 45 * @param holder 46 * @param position 47 */ 48 @Override 49 public void onBindViewHolder(ViewHolder holder, int position) { 50 51 //改变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 //为ViewHolder中的组件进行赋值 75 imageView = (ImageView) itemView.findViewById(R.id.id_but); 76 77 if(listener != null){ //判断RecyclerViewItemViewListener是否为空， 78 // 若为空，不能给子条目设置点击事件，否则会出现空指针 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的点击事件 92 listener.onClickListener(this,position); 93 break; 94 } 95 } 96 97 @Override 98 public boolean onLongClick(View v) { //itemView的长按事件 99 listener.onLongClickListener(this,position);100 return true;101 }102 }103 }
在用RecyclerView时 是没有监听事件的 这个事件需要我们自己去写
新建一个接口
1 public interface RecyclerViewItemViewListener { 2 3 /** 4 * itemView的点击事件 5 * @param viewHolder 6 * @param position 7 */ 8 void onClickListener(RecyclerView.ViewHolder viewHolder, int position); 9 10 /**11 * 是itemView的长按事件12 * @param viewHolder13 * @param position14 */15 void onLongClickListener(RecyclerView.ViewHolder viewHolder, int position);16 17 }