BaseAdapter的封装和实现

叁歲伎倆 2022-06-17 22:57 542阅读 0赞

1、Adapter

【

*/\*\**  
  *\* Created by xuyangsheng on 2017/3/26.*  
  *\* Author : xuyangsheng*  
  *\* Time : 2017/3/26 22:45*  
  *\* Name :*  
  *\* OverView :*  
  *\* Usage :*  *打造超级* *BaseAdapter*  
  *\*/*

public abstract class CommonBaseAdapter< T> extends BaseAdapter \{  
private Context mContext ;  
  private List< T> mDatas ;  
   
  public  CommonBaseAdapter(Context context ,List< T> datas) \{  
this. mContext = context ;  
  this. mDatas = datas ;  
  \}  
  
@Override  
  public int  getCount() \{  
return  mDatas.size() ;  
  \}  
  
@Override  
  public  T  getItem( int position) \{  
return  mDatas.get(position) ;  
  \}  
  
@Override  
  public long  getItemId( int position) \{  
return position ;  
  \}  
  
@Override  
  public View getView( int position , View convertView , ViewGroup parent) \{  
CommonViewHolder holder = CommonViewHolder. *getInstance*( mContext , R.layout. *listview\_item* , position , convertView , parent) ;  
  convert( holder , mDatas.get(position)) ;  
  return  holder.getConvertView() ;  
  \}  
*/\*\**  
  *\**  *填充* *holder* *里面控件的数据*  
  *\**  ***@param***  *holder*  
  *\**  ***@param***  *bean*  
  *\*/*  
   public abstract void  convert(CommonViewHolder holder , T bean) ;  
\}

实现Adapter:

*/\*\**  
  *\* Created by xuyangsheng on 2017/3/26.*  
  *\* Author : xuyangsheng*  
  *\* Time : 2017/3/26 22:50*  
  *\* Name :*  
  *\* OverView :*  
  *\* Usage :*  
  *\*/*  
   
 public class CommonAdapter extends CommonBaseAdapter<Bean> \{  
public  CommonAdapter(Context context , List<Bean> datas) \{  
super(context , datas) ;  
  \}  
  
@Override  
  public void  convert(CommonViewHolder holder , final Bean bean) \{  
holder.setText(R.id. *title* , bean.getTitle())  
.setText(R.id. *desc* , bean.getDesc())  
.setText(R.id. *time* , bean.getTime())  
.setText(R.id. *phone* , bean.getPhone()) ;  
   
  holder.setImageResource(R.id. *timeMake* , R.mipmap. *ic\_launcher*) ;  
   
  // 这个当布局里面有 checkbox 的时候，复用问题的解决  
   final CheckBox cb = holder.getView(R.id. *checkbox*) ;  
  cb.setChecked(bean.isCheck()) ;  
  cb.setOnClickListener( new View.OnClickListener() \{  
@Override  
   public void  onClick(View v) \{  
bean.setCheck( cb.isChecked()) ;  
  \}  
\}) ;  
   
  \}  
\}

】

2、超级ViewHolder

【

*/\*\**  
  *\* Created by xuyangsheng on 2017/3/26.*  
  *\* Author : xuyangsheng*  
  *\* Time : 2017/3/26 22:42*  
  *\* Name :*  
  *\* OverView :*  *打造超级* *Viewholder*  
  *\* Usage :*  
  *\*/*  
   
 public class CommonViewHolder \{  
private int  mPosition ;  
  /\*  
  \*  用于存储 holder 里面的各个 view ，此集合比 map 效率高 , 但 key 必须为 Integer  
  \*/  
  private SparseArray<View> mViews ;  
  */\*\**  
  *\**  *复用的* *view*  
  *\*/*  
   private View convertView ;  
   
  private  CommonViewHolder(Context context , int position , int layoutId , ViewGroup parent) \{  
this. mPosition = position ;  
  mViews = new SparseArray<View>() ;  
  convertView = LayoutInflater. *from*(context).inflate(layoutId , parent ,false) ;  
  convertView.setTag( this) ;  
  \}  
  
public static CommonViewHolder getInstance(Context context ,int layoutId ,int position , View convertView , ViewGroup parent) \{  
if (convertView == null) \{  
return new CommonViewHolder(context , position , layoutId , parent) ;  
  \} else \{  
CommonViewHolder holder = (CommonViewHolder) convertView.getTag() ;  
   holder. mPosition = position ;  
  return  holder ;  
  \}  
  
\}  
  
*/\*\**  
  *\**  *通过* *resourceId* *获取* *item* *里面的* *view*  
  *\**  ***@param***  *resourceId*  *控件的* *id*  
  *\**  ***@return***  
  *\*/*  
   @SuppressWarnings( "unchecked")  
public < T  extends View> T  getView( int resourceId) \{  
View view = mViews.get(resourceId) ;  
  if ( view == null) \{  
view = convertView.findViewById(resourceId) ;  
   mViews.put(resourceId ,  view) ;  
  \}  
return ( T) view ;  
  \}  
  
*/\*\**  
  *\**  *为* *textview* *类型填充内容*  
  *\**  ***@param***  *resourceId*  
  *\**  ***@param***  *text*  
  *\**  ***@return***  *CommonViewHolder*  
  *\*/*  
   public CommonViewHolder setText( int resourceId ,CharSequence text ) \{  
((TextView) getView(resourceId)).setText(text) ;  
  return this;  
  \}  
public CommonViewHolder setText( int resourceId ,int resid ) \{  
((TextView) getView(resourceId)).setText(resid) ;  
  return this;  
  \}  
*/\*\**  
  *\**  *为* *ImageView* *设置* *Bitmap*  
  *\**  ***@param***  *resourceId*  
  *\**  ***@param***  *bm*  
  *\**  ***@return***  
  *\*/*  
   public CommonViewHolder setBitmap( int resourceId ,Bitmap bm) \{  
((ImageView)getView(resourceId)).setImageBitmap(bm) ;  
  return this;  
  \}  
public CommonViewHolder setImageDrawable( int resourceId ,Drawable drawable) \{  
((ImageView)getView(resourceId)).setImageDrawable(drawable) ;  
  return this;  
  \}  
public CommonViewHolder setImageResource( int resourceId ,int resId) \{  
((ImageView)getView(resourceId)).setImageResource(resId) ;  
  return this;  
  \}  
  
  
public View getConvertView() \{  
return  convertView ;  
  \}  
*/\*\**  
  *\**  *获取当前* *item* *的位置*  
  *\**  ***@return***  
  *\*/*  
   public int  getPosition() \{  
return  mPosition ;  
  \}  
\}

】

3、Bean

【

*/\*\**  
  *\* Created by xuyangsheng on 2017/3/26.*  
  *\* Author : xuyangsheng*  
  *\* Time : 2017/3/26 22:52*  
  *\* Name :*  
  *\* OverView :*  
  *\* Usage :*  
  *\*/*  
   
 public class Bean \{  
  
private String title ;  
  private String desc ;  
  private String phone ;  
  private String time ;  
   
  public  Bean(String pTitle , String pDesc , String pPhone , String pTime) \{  
title = pTitle ;  
  desc = pDesc ;  
  phone = pPhone ;  
  time = pTime ;  
  \}  
  
// 这个当布局里面有 checkbox 的时候，复用问题的解决  
   private boolean  isCheck ;  
  // 略去 get/set 等 ...  
   
  public String getTitle() \{  
return  title ;  
  \}  
  
public void  setTitle(String pTitle) \{  
title = pTitle ;  
  \}  
  
public String getDesc() \{  
return  desc ;  
  \}  
  
public void  setDesc(String pDesc) \{  
desc = pDesc ;  
  \}  
  
public String getPhone() \{  
return  phone ;  
  \}  
  
public void  setPhone(String pPhone) \{  
phone = pPhone ;  
  \}  
  
public String getTime() \{  
return  time ;  
  \}  
  
public void  setTime(String pTime) \{  
time = pTime ;  
  \}  
  
public boolean  isCheck() \{  
return  isCheck ;  
  \}  
  
public void  setCheck( boolean pCheck) \{  
isCheck = pCheck ;  
  \}  
  
\}

】

4、测试用例

【

public class MainActivity extends Activity \{  
private ListView listView ;  
  private List<Bean> mDatas ;  
  private CommonAdapter commonAdapter ;  
   
  @Override  
  protected void  onCreate(Bundle savedInstanceState) \{  
super.onCreate(savedInstanceState) ;  
  setContentView(R.layout. *activity\_main*) ;  
   
  initDatas() ;  
  initView() ;  
  regisetListener() ;  
  \}  
  
@SuppressWarnings( "deprecation")  
private void  initDatas() \{  
mDatas = new ArrayList<Bean>() ;  
  for ( int  i = 0  ;  i < 20 ;  i \++) \{  
mDatas.add( new Bean( "Android  适配器 " \+ i ,  "android  新的征程，新的探索，新的追求！ " ,  "1231212112" \+ i , new Date().toLocaleString())) ;  
  \}  
\}  
  
private void  initView() \{  
listView = (ListView) findViewById(R.id. *listview*) ;  
  commonAdapter = new CommonAdapter( this,  mDatas) ;  
  listView.setAdapter( commonAdapter) ;  
  \}  
  
private void  regisetListener() \{  
listView.setOnItemClickListener( new AdapterView.OnItemClickListener() \{  
  
@Override  
   public void  onItemClick(AdapterView<?> parent , View view ,  
  int position , long id) \{  
Bean bean = mDatas.get(position) ;  
  Toast. *makeText*(MainActivity. this,  bean.getTitle() , Toast. *LENGTH\_SHORT*).show() ;  
  \}  
\}) ;  
  \}  
\}

】