自從接觸Android studio以後,對全新的Android UI設計理念以及V7包都有了全新的認識和學習掌握的渴望,因此特地去看了一下全新控件RecycleView的使用,總結如下。
他的用法與listview的用法差不多,主要由:adapter、排列布局、執行動畫三個部分構成,其中adapter不需要再繼承自baseadapter , 轉而繼承RecyclerView.Adapter這個屬性,這是谷歌所規定以及建議的一個方法 , 其中view holder與原本的用法無異,主要就是申明item中的佈局文件,這裏的MyViewHolder就是繼承自ViewHolder,並且我把它直接現在adapter裏作爲其內部類來使用。
除此之外,recycleview可以實現ListView的佈局、gridview的佈局以及瀑布流的佈局,因此除了設置其adapter以外,還需聲明他的佈局屬性,由佈局管理器:LinearLayoutManager ,別的和list view的用法無太大差異,直接貼上代碼:
主activity文件:
private RecyclerView mRecycleView;
private List<String> mDatas;
private com.im.ui.adapter.SimpleAdapter mAdapter;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.activity_first , container , false);
//實例化控件
mRecycleView = (RecyclerView) v.findViewById(R.id.recycle);
//佈局管理器, LinearLayoutManager.VERTICAL:list設置爲垂直
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getActivity() , LinearLayoutManager.VERTICAL , false);
mRecycleView.setLayoutManager(linearLayoutManager);
mAdapter = new com.im.ui.adapter.SimpleAdapter(getActivity() , mDatas);
mRecycleView.setAdapter(mAdapter);
//設置分割線,DividerItemDecoration:GitHub上的一個分割線類,可自行搜索
mRecycleView.addItemDecoration(new DividerItemDecoration(getActivity() , DividerItemDecoration.VERTICAL_LIST));
return v;
}
適配器文件:
public class SimpleAdapter extends RecyclerView.Adapter<MyViewHolder>{
private LayoutInflater mInflater;
private Context mContext;
private List<String> mDatas;
public SimpleAdapter(Context context , List<String> datas){
this.mContext = context;
this.mDatas = datas;
mInflater = LayoutInflater.from(context);
}
//創建ViewHolder
@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = mInflater.inflate(R.layout.item_first , parent , false);
MyViewHolder viewHolder = new MyViewHolder(view );
return viewHolder;
}
//綁定一個ViewHolder
@Override
public void onBindViewHolder(MyViewHolder holder, int position) {
holder.tv.setText(mDatas.get(position));
}
@Override
public int getItemCount() {
return mDatas.size();
}
}
class MyViewHolder extends RecyclerView.ViewHolder{
TextView tv;
public MyViewHolder(View itemView) {
super(itemView);
tv = (TextView) itemView.findViewById(R.id.tv_item_first);
}
}
xml:
<android.support.v7.widget.RecyclerView
android:id="@+id/test_recycle"
android:layout_width="match_parent"
android:layout_height="match_parent">
</android.support.v7.widget.RecyclerView>