Android ListView重写Adapter

在很多项目中都会用到ListView，但基本都需要进行重写Adapter，但每次都是会找好半天，写在这儿方便以后copy~~
xml定义一个ListView：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <ListView android:id="@+id/listview" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_alignParentLeft="true" android:background="#ffffff" android:padding="5dip" > </ListView> </LinearLayout>

重写Adapter：

public class SmsMmsAdapter extends BaseAdapter { private LayoutInflater mInflater; private Context mContext; private MessageBase mMessageBase; private MessageMms mMessageMms; private MessageSms mMessageSms; private ViewHolder mViewHolder; public SmsMmsAdapter(Context pContext) { mContext = pContext; mInflater = LayoutInflater.from(pContext); mMessageBase = new MessageBase(); mMessageMms = new MessageMms(); mMessageSms = new MessageSms(); } @Override public int getCount() { // TODO Auto-generated method stub return mMessageList.size(); } @Override public Object getItem(int position) { // TODO Auto-generated method stub return null; } @Override public long getItemId(int position) { // TODO Auto-generated method stub return 0; } @Override public View getView(int position, View convertView, ViewGroup parent) { // TODO Auto-generated method stub mMessageBase = mMessageList.get(position); if (convertView == null) { mViewHolder = new ViewHolder(); convertView = mInflater.inflate(R.layout.list_say_he_item, parent, false); } else { if (convertView.getId() != R.id.mListSayHeItem) { convertView = mInflater.inflate( R.layout.list_say_he_item, parent, false); mViewHolder = new ViewHolder(); } else { mViewHolder = (ViewHolder) convertView.getTag(); } } mMessageBase = mMessageList.get(position); mViewHolder.mBody = (TextView) convertView .findViewById(R.id.mMmsContent); mViewHolder.mMmsBitmap = (ImageView) convertView.findViewById(R.id.mMmsBitmap); mViewHolder.mMmsSubject = (TextView) convertView.findViewById(R.id.mMmsSubject); mViewHolder.mMmsSendTime = (TextView) convertView.findViewById(R.id.mMmsSendTime); convertView.setTag(mViewHolder); return convertView; } public final class ViewHolder { public TextView mBody; public ImageView mMmsBitmap; public TextView mMmsSubject; public TextView mMmsSendTime; } }

其中ListView的大小是由mMessageList的大小来决定的，convertView通过setTag和getTag方法来实现重用机制，在重用的过程中，通过convertView.getId来和期望的布局Id进行比较，如果是则进行重用，如果不是则重新从布局中读取，这个方法只适合在ListView中的每个Item并不是完全一样，比如第一行和别的不一样，mListSayHeItem是list_say_he_item中最外外边的那个布局Id.

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