android5.0_RecycleView初識

RecycleView是android5.0中的控件，是用來替換ListView,GridView的，RecycleView需要自己寫點選事件 二不能像ListView直接設定操作靈活，這樣的新東西肯定是要學習的。下面就學習的結果做總結。

1、要先導入android-support-v7-recycleview.jar包到項目中。

2、建立布局檔案添加控件

<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" > 

<android.support.v7.widget.RecyclerView 

android:id="@+id/recyclerview"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:scrollbars="vertical"/>

</RelativeLayout>

3、在activity中得到該控件,在activity中如果可以确定每個item的高度是固定的，設定這個選項可以提高性 能recyclerview.setHasFixedSize(true); 生成LinearLayoutManager，設定方向

linearlayoutmanager = new LinearLayoutManager(ct);  

linearlayoutmanager.setOrientation(oritation);  

設定動畫  

recyclerview.setItemAnimator(new DefaultItemAnimator());

添加分割線  

recyclerview.addItemDecoration();  

執行個體化擴充卡  

adapter = new RecycleAdapter(ct,list);  

設定擴充卡  

recyclerview.setAdapter(adapter);

4、定義資料擴充卡和點選事件 自定義監聽事件接口 

public interface ItemClickListener 

{

public void onItemLongClick(View view, int postion);

public void onItemClick(View view, int postion);

public void onItemSubViewClick(View view, int postion);

} 

自定義擴充卡

public class RecycleAdapter extends Adapter<RecycleAdapter.MViewHolder> 

{

定義一個RecycleView的擴充卡 * 

建立一個類繼承自Adapter<RecycleAdapter.MViewHolder>

實作三個父類方法  

onCreateViewHolder 建立新View，被LayoutManager所調用

onBindViewHolder 将資料與界面進行綁定的操作

getItemCount 擷取資料的數量

MViewHolder 自定義的ViewHolder，持有每個Item的的所有界面元素 *

private ItemClickListener itemclicklistener;

private Context ct; private List<String> list;

@Override

public int getItemCount() {

return list.size();

}

public RecycleAdapter(Context ct,List<String> list){

super();

this.ct=ct;

this.list=list;

}

提供activity調用傳入接口實作

public void setItemClickListener(ItemClickListener mItemClickListener)

{

this.itemclicklistener = mItemClickListener;

}

@Override

public MViewHolder onCreateViewHolder(ViewGroup arg0, int arg1) {

建立子視圖View,将view傳入自定義的ViewHolder

View view = View.inflate(ct,R.layout.item_user_friend_nod,null);

MViewHolder mviewhHolder = new MViewHolder(view);

return mviewhHolder;

}

@Override

public void onBindViewHolder(

final MViewHolder mViewHolder, final int postion) {

綁定子視圖控件資料

mViewHolder.textview.setText("1");

mViewHolder.textview.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

if(itemclicklistener!=null){ itemclicklistener.onItemSubViewClick(mViewHolder.textview, postion);

}

}

});

}

public class MViewHolder extends RecyclerView.ViewHolder {

TextView textview;

public MViewHolder(final View view) {

super(view);

this.textview = (TextView) view.findViewById(R.id.tv_friend_name); view.setOnLongClickListener(new OnLongClickListener() {

@Override

public boolean onLongClick(View v) {

if(itemclicklistener!=null){ itemclicklistener.onItemLongClick(view,getPosition());

}

return true;

}

});

view.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

if(itemclicklistener!=null){

itemclicklistener.onItemClick(view, getPosition());

}

}

});

}

}} 

activity調用

public class MainActivity extends Activity {

private RecyclerView recyclerview;

List<String> list;

LinearLayoutManager linearlayoutmanager;

Context ct;

RecycleAdapter adapter;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

requestWindowFeature(Window.FEATURE_NO_TITLE);

setContentView(R.layout.activity_main);

ct = this;

recyclerview = (RecyclerView) findViewById(R.id.recyclerview);

list = new ArrayList<String>();

for (int i = 0; i < 30; ++i) {

list.add("第"+i+1+"位");

}

setRecyclerView(LinearLayoutManager.VERTICAL);

}

public void setRecyclerView(int oritation){

recyclerview.setHasFixedSize(true);

linearlayoutmanager = new LinearLayoutManager(ct);

linearlayoutmanager.setOrientation(oritation); recyclerview.setLayoutManager(linearlayoutmanager);

recyclerview.setItemAnimator(new DefaultItemAnimator());  

recyclerview.addItemDecoration(

new ItemDecoration() { });  

adapter = new RecycleAdapter(ct,list);  

adapter.setItemClickListener(new ItemClickListener() {

@Override

public void onItemSubViewClick(View view, int postion) {

Toast.makeText(ct,"點選了第"+postion+"個内部TextView",0).show();

}

@Override

public void onItemLongClick(View view, int postion) {

Toast.makeText(ct,"長按了第"+postion+"個",0).show();

}

@Override

public void onItemClick(View view, int postion) {

Toast.makeText(ct,"點選了第"+postion+"個",0).show();

}

}); 

recyclerview.setAdapter(adapter);

}}