android 簡(jiǎn)單的adapter封裝

 在開發(fā)中l(wèi)istview是每個(gè)項(xiàng)目肯定要使用的控件,用到listview就必須用到BaseAdapter,一般老大搭框架的時(shí)候會(huì)把一些重用的東西抽取出來(lái),方便每個(gè)開發(fā)人員使用并且復(fù)用性很強(qiáng),那么必須封裝的好,今天簡(jiǎn)單的寫一個(gè)平時(shí)使用到的,把BaseAdapter封裝下,

MyBaseAdapter.java

public abstract class MyBaseAdapter extends BaseAdapter {

private List datas;

private Context context;

public MyBaseAdapter(List datas, Context context) {

super();

this.datas = datas;

this.context = context;

}

@Override

public int getCount() {

return datas.size();

}

@Override

public Object getItem(int position) {

return datas.get(position);

}

@Override

public long getItemId(int position) {

return position;

}

@Override

public abstract View getView(int position, View arg1, ViewGroup arg2);

}

其實(shí)我們?cè)谑褂胊dapter的時(shí)候其他三個(gè)方法 返回值都是一樣的,因此這個(gè)可以在父類就處理好,唯一每個(gè)子類不知道實(shí)現(xiàn)的就是getView()方法的實(shí)現(xiàn),因此只要讓每個(gè)子類實(shí)現(xiàn)自己的getView()方法即可,因此就抽取成上面的MyBaseAdapter類了,現(xiàn)在寫一個(gè)類簡(jiǎn)單實(shí)用這個(gè)框架

MainActivity.java

public class MainActivity extends Activity {

private ListView listview;

private ArrayList datas;

private LayoutInflater inflater;

private MyAdapter adapter;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

listview = (ListView) findViewById(R.id.listview);

inflater = LayoutInflater.from(this);

initData();

adapter = new MyAdapter(datas,this);

listview.setAdapter(adapter);

}

private void initData() {

datas = new ArrayList();

for(int i=0;i<100;i++){

datas.add("測(cè)試-------");

}

}

class MyAdapter extends MyBaseAdapter{

public MyAdapter(List datas, Context context) {

super(datas, context);

}

@Override

public View getView(int position, View converView, ViewGroup arg2) {

ViewHolder holder = null;

if(converView==null){

converView = inflater.inflate(R.layout.item, null);

holder = new ViewHolder();

holder.tvContent = (TextView) converView.findViewById(R.id.tvContent);

converView.setTag(holder);

}else{

holder = (ViewHolder) converView.getTag();

}

holder.tvContent.setText(datas.get(position));

return converView;

}

class ViewHolder{

TextView tvContent;

}

}

}

其實(shí)看開源的框架還是自己項(xiàng)目中的框架,一般框架都用到,接口，抽象類,接口回調(diào),泛型,繼承,內(nèi)部類等，多寫幾遍,其實(shí)框架也沒那么難