RecyclerView的Adapter万能适配包

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在Android L版本中，引入了appcompat新特性（RecyclerView，Toolbar，CardView，palette）

http://android-developers.blogspot.com/2014/10/appcompat-v21-material-design-for-pre.html（需要翻墙）

其中RecyclerView用来取代ListView和GridView

项目目录：



从这里看出，以后Recyclerview使用Adapter万能适配，减少写Adapter类（少了SimpleAdapter）

一.一个简单的RecyclerView的demo（一般写法）

1.新建Android Studio项目，在新建一个module叫simple，在simple的build.gradle加入

compile 'com.jesse.recyclerview:recyclerview:23.1.1'

引入recyclerview包



2.在activity_main.xml引入recyclerview布局

<?xml version="1.0" encoding="utf-8"?>
<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.jesse.myapplication.MainActivity">

<!-- 引入RecyclerView布局-->
<android.support.v7.widget.RecyclerView
android:id="@+id/recyclerview"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
</RelativeLayout>

3.新建item_data.xml布局，作为recyclerview的item布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="@+id/tv_name"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>

4.新建Data.java作为RecyclerView的数据Bean类

public class Data {
private String name;
private String title;

public Data(String name, String title) {
this.name = name;
this.title = title;
}

public String getName() {
return name;
}

public String getTitle() {
return title;
}
}

5.新建SimpleAdapter.java作为RecyclerView的Adapter

public class SimpleAdapter extends RecyclerView.Adapter<SimpleAdapter.SimpleHolder> {
private Context mContext;
private int mResID;
private List<Data> mDatas;

public SimpleAdapter(Context mContext, int mResID,  List<Data> mDatas) {
this.mContext = mContext;
this.mResID = mResID;
this.mDatas = mDatas;
}

@Override
public SimpleHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view= LayoutInflater.from(mContext).inflate(mResID,parent,false);
return new SimpleHolder(view);//加载item的布局
}

@Override
public void onBindViewHolder(final SimpleHolder holder, int position) {
//item的单击事件
holder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (mOnItemClickListener != null) {
int layoutPosition = holder.getLayoutPosition();
mOnItemClickListener.onItemClick(holder.itemView, layoutPosition);
}
}
});
//设置item的子view设置数据
holder.tv_name.setText(mDatas.get(position).getName());
holder.tv_title.setText(mDatas.get(position).getTitle());
}

@Override
public int getItemCount() {
return mDatas==null?0:mDatas.size();
}

public class SimpleHolder extends RecyclerView.ViewHolder {
private TextView tv_name;
private TextView tv_title;
public SimpleHolder(View itemView) {
super(itemView);
//初始化id
tv_name= (TextView) itemView.findViewById(R.id.tv_name);
tv_title= (TextView) itemView.findViewById(R.id.tv_title);
}
}

public void addData(int pos, Data t) {
mDatas.add(pos, t);
//        notifyDataSetChanged();
notifyItemInserted(pos);
}

public void addData(Data t) {
mDatas.add(t);
notifyDataSetChanged();
}

public void removeData(int pos) {
mDatas.remove(pos);
//        notifyDataSetChanged();
notifyItemRemoved(pos);
}

public interface OnItemClickListener {
void onItemClick(View view, int position);
}

private OnItemClickListener mOnItemClickListener;

public void setOnItemClickListener(OnItemClickListener mOnItemClickListener) {
this.mOnItemClickListener = mOnItemClickListener;
}

}

6.在MainActivity.java使用

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initDatas();
assignViews();
initRecyclerview();
}

private SimpleAdapter mAdapter;
private void initRecyclerview() {
//设置mRecyclerview的item向下排列
mRecyclerview.setLayoutManager(new LinearLayoutManager(this));
mAdapter=new SimpleAdapter(this,R.layout.item_data,mDatas);
mRecyclerview.setAdapter(mAdapter);
//设置mRecyclerview的item单击事件
mAdapter.setOnItemClickListener(new SimpleAdapter.OnItemClickListener() {
@Override
public void onItemClick(View view, int position) {
Toast.makeText(MainActivity.this,"toast"+position,Toast.LENGTH_SHORT).show();
}
});
}

private List<Data> mDatas;
//初始化数据
private void initDatas() {
mDatas=new ArrayList<>();
for (int i=0;i<10;i++){
mDatas.add(new Data("jesse"+i,"title"+i));
}
}

private RecyclerView mRecyclerview;
//初始化布局id
private void assignViews() {
mRecyclerview = (RecyclerView) findViewById(R.id.recyclerview);
}

}

运行效果：



二：Adapter万能适配的使用示例（减少 “一” 的第5步，也就是不用新建SimpleAdapter）

1.在app的module的build.gradle加入

compile 'com.jesse.recyclerview:recyclerview:23.1.1'

引入recyclerview包



该库的地址是：https://github.com/xiejinquan/recyclerview

2,3,4和 “一” 的2,3,4步一样

5.在MainActivity.java使用

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initDatas();
assignViews();
initRecyclerview();
}

private JesseAdapter<Data> mAdapter;

/**
* 设置Recyclerview
*/
private void initRecyclerview() {
mRecyclerview.setLayoutManager(new LinearLayoutManager(this));
mAdapter=new JesseAdapter<Data>(this,R.layout.item_data,mDatas) {
@Override
public void onBindView(JesseHolder holder, int position) {
TextView tv_name=holder.getView(R.id.tv_name);
tv_name.setText(mDatas.get(position).getName());
TextView tv_title=holder.getView(R.id.tv_title);
tv_title.setText(mDatas.get(position).getTitle());
}
};
mRecyclerview.setAdapter(mAdapter);
}

private List<Data> mDatas;

/**
* 初始化数据
*/
private void initDatas() {
mDatas=new ArrayList<>();
for (int i=0;i<10;i++){
mDatas.add(new Data("jesse"+i,"title"+i));
}
}

private RecyclerView mRecyclerview;

/**
* 初始化布局的id
*/
private void assignViews() {
mRecyclerview = (RecyclerView) findViewById(R.id.recyclerview);
}

}

运行效果和 “一” 的运行效果一样

三.分享Adapter的万能适配类的源码

JesseAdapter.java作为RecyclerView的Adapter的万能适配

public abstract class JesseAdapter<T> extends RecyclerView.Adapter<JesseHolder> {

protected Context mContext;
protected int mLayout;
protected List<T> mDatas;

public JesseAdapter(Context mContext, int mLayout, List<T> mDatas) {
this.mContext = mContext;
this.mLayout = mLayout;
this.mDatas = mDatas;
}

@Override
public JesseHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(mContext).inflate(mLayout, parent, false);
return new JesseHolder(view);
}

@Override
public void onBindViewHolder(final JesseHolder holder, int position) {
holder.getItemView().setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (mOnItemClickListener != null) {
int layoutPosition = holder.getLayoutPosition();
mOnItemClickListener.onItemClick(holder.getItemView(), layoutPosition);
}
}
});
onBindView(holder, position);
}

public abstract void onBindView(JesseHolder holder, int position);

@Override
public int getItemCount() {
return mDatas == null ? 0 : mDatas.size();
}

public void addData(int pos, T t) {
mDatas.add(pos, t);
//        notifyDataSetChanged();
notifyItemInserted(pos);
}

public void addData(T t) {
mDatas.add(t);
notifyDataSetChanged();
}

public void removeData(int pos) {
mDatas.remove(pos);
//        notifyDataSetChanged();
notifyItemRemoved(pos);
}

public interface OnItemClickListener {
void onItemClick(View view, int position);
}

private OnItemClickListener mOnItemClickListener;

public void setOnItemClickListener(OnItemClickListener mOnItemClickListener) {
this.mOnItemClickListener = mOnItemClickListener;
}
}

JesseHolder作为RecyclerView的Holder

public class JesseHolder extends RecyclerView.ViewHolder {

private final SparseArray<View> mViews;
private View mItemView;

public JesseHolder(View mItemView) {
super(mItemView);
this.mItemView = mItemView;
this.mViews = new SparseArray<View>();
}

public View getItemView() {
return mItemView;
}

public <T extends View> T getView(int viewId) {
View view = mViews.get(viewId);
if (view == null) {
view = mItemView.findViewById(viewId);
mViews.put(viewId, view);
}
return (T) view;
}
}

源码下载

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