RecycleView实现瀑布流的效果图:
1.因为RecycleView是android5.0后出来的,需要添加recycleview依赖库。快捷键Ctrl+Shift+Alt+S弹出项目结构界面。
2.在弹出的对话框中选择recycleview-v7的依赖库,点击确定
3.在activity_main布局文件中创建RecycleView控件
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.zhiyuan3g.myrecycleviewstagger.MainActivity">
<android.support.v7.widget.RecyclerView
android:id="@+id/Recycle_View"
android:layout_width="match_parent"
android:layout_height="match_parent">
</android.support.v7.widget.RecyclerView>
</RelativeLayout>
4.在MainActivity.java文件中实例化控件,创建图片数组。public class MainActivity extends AppCompatActivity {
private RecyclerView recycleview;
private int image[] = {R.drawable.pre12, R.drawable.pre15,R.drawable.pre19,
R.drawable.pre13,R.drawable.pre14, R.drawable.pre15, R.drawable.pre21,
R.drawable.pre16, R.drawable.pre17, R.drawable.pre19,
R.drawable.pre21, R.drawable.pre15, R.drawable.pre22};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
recycleview = (RecyclerView) findViewById(R.id.Recycle_View);
}
}
5.创建DataBean类,存放Recycle的数据
//创建DataBean类,存放数据
public class DataBean {
public int Icon;
public String name;
}
6.我们要RecycleView实现瀑布流,需要创建MyRecycleStaggeredGridAdapter(名字自己定)适配器
//RecycleView的适配器,要注意指定的泛型,一般我们就是类名的ViewHolder继承ViewHolder(内部已经实现了复用优化机制)
public class MyRecycleStaggerAdapter extends RecyclerView.Adapter<MyRecycleStaggerAdapter.StaggerViewHolder>{
private Context mContext;
//泛型是RecycleView所需的bean类
private List<DataBean>mList;
//创建构造方法;一个需要接受两个参数,上下文,集合对象(包含了我们所需要的数据)
public MyRecycleStaggerAdapter(Context context, List<DataBean> list) {
mContext = context;
mList = list;
}
@Override
//创建staggerViewHolder,并把ViewHolder返回出去
public MyRecycleStaggerAdapter.StaggerViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
//转换一个View布局,决定了item的样子, 参数:1.上下文 2.Xml布局资源 3.为null
View view = View.inflate(mContext, R.layout.item_stagger, null);
//创建一个staggerViewHolder对象
StaggerViewHolder staggerViewHolder = new StaggerViewHolder(view);
//把staggerViewHolder对象传出去
return staggerViewHolder;
}
@Override
//当VIewHolder和数据绑定时回调
public void onBindViewHolder(MyRecycleStaggerAdapter.StaggerViewHolder holder, int position) {
//从集合里拿对应item数据对象
DataBean dataBean = mList.get(position);
//给Holder里面的控件对象设置数据
holder.setData(dataBean);
}
@Override
public int getItemCount() {
//决定RecycleView有多少条item
if(mList!=null&&mList.size()>0){
return mList.size();
}
return 0;
}
public class StaggerViewHolder extends RecyclerView.ViewHolder {
private final ImageView mIcon;
private final TextView mTextView;
public StaggerViewHolder(View itemView) {
super(itemView);
mIcon = (ImageView)itemView.findViewById(R.id.item_stagger_iv_icon);
mTextView = (TextView) itemView.findViewById(R.id.item_stagger_tv_name);
}
public void setData(DataBean data) {
//给ImageView设置图片数据
mIcon.setImageResource(data.Icon);
//给TextView设置文本数据
mTextView.setText(data.name);
}
}
}
7.在创建适配器时,需要创建一个item_stagger布局
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:adjustViewBounds="true"
android:scaleType="fitXY"
android:id="@+id/item_stagger_iv_icon"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"/>
<TextView
android:id="@+id/item_stagger_tv_name"
android:textSize="30sp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"/>
</LinearLayout>
8.创建实现瀑布流的方法StaggerLoadData(Boolean inversion,Boolean orientation);需要判断瀑布流的方向;
private void StaggerLoadData(Boolean inversion,Boolean orientation) {
//集合对象
ArrayList<DataBean> list = new ArrayList<>();
//给DataBean类放数据,最后把装好数据的DataBean类放到集合里
for(int i=0;i<image.length;i++){
//创建DataBean类对象,
DataBean dataBean=new DataBean();
dataBean.Icon = image[i];
dataBean.name ="美女"+i;
//把DataBean类放入集合里
list.add(dataBean);
}
//创建适配器Adapter对象 参数:1.上下文2.数据加载集合
MyRecycleStaggerAdapter adapter = new MyRecycleStaggerAdapter(this,list);
//设置适配器
recycleview.setAdapter(adapter);
//new Stagger布局管理器,布局管理器所需参数:1.规定显示几列 2.item排列方向
StaggeredGridLayoutManager staggeredGridLayoutManager = new StaggeredGridLayoutManager(2, orientation ? StaggeredGridLayoutManager.VERTICAL : StaggeredGridLayoutManager.HORIZONTAL);
//通过布局管理器控制条目排列的顺序 true:反向显示 false:正向显示
staggeredGridLayoutManager.setReverseLayout(inversion);
//设置布局管理器,参数StaggeredGridLayoutManager,可以是RecyclerView实现和StaggeredGridView一样的效果
recycleview.setLayoutManager(staggeredGridLayoutManager);
}
9.创建Menu菜单,来实现RecycleView瀑布流的各种样式,用onCreateOptionsMenu加载一个菜单的布局
@Override
public boolean onCreateOptionsMenu(Menu menu) {
//加载布局使用菜单特有方法getMenuInflater。或Inflate对象,参数:1.菜单显示的不就 2.固定menu
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
10.在res下创建menu文件夹,在menu文件夹中创建menu_item布局;
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<item android:id="@+id/action_stagger"
android:orderInCategory="100"
android:title="stagger显示"
app:showAsAction="never"
>
<menu>
<item
android:id="@+id/action_stagger_normal"
android:orderInCategory="100"
android:title="标准"
app:showAsAction="never"
/>
<item
android:id="@+id/action_stagger_reverse"
android:orderInCategory="100"
android:title="垂直反向"
app:showAsAction="never"
/>
<item
android:id="@+id/action_stagger_horizontal"
android:orderInCategory="100"
android:title="水平"
app:showAsAction="never"
/>
<item
android:id="@+id/action_stagger_horizontal_reverse"
android:orderInCategory="100"
android:title="水平反向"
app:showAsAction="never"
/>
</menu>
</item>
</menu>
11.用onOptionsItemSelected给menu菜单添加点击事件
//菜单按钮点击事件的处理
public boolean onOptionsItemSelected(MenuItem item) {
//获取item的id
int itemId = item.getItemId();
//stagger标准显示
if (itemId == R.id.action_stagger_normal) {
StaggerLoadData(false, true);
return true;
}//stagger垂直显示
else if (itemId == R.id.action_stagger_reverse) {
StaggerLoadData(true, true);
}//stagger水平显示
else if (itemId == R.id.action_stagger_horizontal) {
StaggerLoadData(false, false);
}//stagger水平反向显示
else if (itemId == R.id.action_stagger_horizontal_reverse) {
StaggerLoadData(true, false);
}
return super.onOptionsItemSelected(item);
}
MainActivity.java的代码:
public class MainActivity extends AppCompatActivity {
private RecyclerView recycleview;
private int image[] = {R.drawable.pre12, R.drawable.pre15,R.drawable.pre19,
R.drawable.pre13,R.drawable.pre14, R.drawable.pre15, R.drawable.pre21,
R.drawable.pre16, R.drawable.pre17, R.drawable.pre19,
R.drawable.pre21, R.drawable.pre15, R.drawable.pre22};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
recycleview = (RecyclerView) findViewById(R.id.Recycle_View);
}
private void StaggerLoadData(Boolean inversion,Boolean orientation) {
//集合对象
ArrayList<DataBean> list = new ArrayList<>();
//给DataBean类放数据,最后把装好数据的DataBean类放到集合里
for(int i=0;i<image.length;i++){
//创建DataBean类对象,
DataBean dataBean=new DataBean();
dataBean.Icon = image[i];
dataBean.name ="美女"+i;
//把DataBean类放入集合里
list.add(dataBean);
}
//创建适配器Adapter对象 参数:1.上下文2.数据加载集合
MyRecycleStaggerAdapter adapter = new MyRecycleStaggerAdapter(this,list);
//设置适配器
recycleview.setAdapter(adapter);
//new Stagger布局管理器,布局管理器所需参数:1.规定显示几列 2.item排列方向
StaggeredGridLayoutManager staggeredGridLayoutManager = new StaggeredGridLayoutManager(2, orientation ? StaggeredGridLayoutManager.VERTICAL : StaggeredGridLayoutManager.HORIZONTAL);
//通过布局管理器控制条目排列的顺序 true:反向显示 false:正向显示
staggeredGridLayoutManager.setReverseLayout(inversion);
//设置布局管理器,参数StaggeredGridLayoutManager,可以是RecyclerView实现和StaggeredGridView一样的效果
recycleview.setLayoutManager(staggeredGridLayoutManager);
}
//菜单,RecycleView各种效果的展示
//加载一个菜单的布局
@Override
public boolean onCreateOptionsMenu(Menu menu) {
//加载布局使用菜单特有方法getMenuInflater。或Inflate对象,参数:1.菜单显示的不就 2.固定menu
getMenuInflater().inflate(R.menu.menu_item, menu);
return true;
}
@Override
//菜单按钮点击事件的处理
public boolean onOptionsItemSelected(MenuItem item) {
//获取item的id
int itemId = item.getItemId();
//stagger标准显示
if (itemId == R.id.action_stagger_normal) {
StaggerLoadData(false, true);
return true;
}//stagger垂直显示
else if (itemId == R.id.action_stagger_reverse) {
StaggerLoadData(true, true);
}//stagger水平显示
else if (itemId == R.id.action_stagger_horizontal) {
StaggerLoadData(false, false);
}//stagger水平反向显示
else if (itemId == R.id.action_stagger_horizontal_reverse) {
StaggerLoadData(true, false);
}
return super.onOptionsItemSelected(item);
}
}