Android为ListView的Item设置不同的布局

Adapter的getViewTypeCount和getItemViewType

Android为ListView的Item设置不同的布局

你需要做这些:

1 getViewTypeCount()和getItemViewType(int position)方法.

1.1重(@Override)写 getViewTypeCount() – 返回你有多少个不同的布局

1.2重(@Override)写 getViewTypeCount(int position)中需要依据position的不同，返回不同的Type.

2 在getView()方法中针对不同的Type为Item设置布局

2.1得到当前位置(position)时的Type即代码:currentType= getItemViewType(position);

2.2依据Type的不同为Item设置布局 ，在getView中创建正确的convertView

以下是代码：

public class MultipleItemsList extends ListActivity {

private MyCustomAdapter mAdapter;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mAdapter = new MyCustomAdapter();
for (int i = 1; i < 50; i++) {
mAdapter.addItem("item " + i);
if (i % 4 == 0) {
mAdapter.addSeparatorItem("separator " + i);
}
}
setListAdapter(mAdapter);
}

private class MyCustomAdapter extends BaseAdapter {

private static final int TYPE_ITEM = 0;
private static final int TYPE_SEPARATOR = 1;

private LayoutInflater mInflater;

private ArrayList mData = new ArrayList();
private TreeSet mSeparatorsSet = new TreeSet();

public MyCustomAdapter() {
mInflater = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}

public void addItem(final String item) {
mData.add(item);
notifyDataSetChanged();
}

public void addSeparatorItem(final String item) {
mData.add(item);
mSeparatorsSet.add(mData.size() - 1);
notifyDataSetChanged();
}

@Override
public int getItemViewType(int position) {
return mSeparatorsSet.contains(position) ? TYPE_SEPARATOR : TYPE_ITEM;
}

@Override
public int getViewTypeCount() {
return 2;
}

@Override
public int getCount() {
return mData.size();
}

@Override
public String getItem(int position) {
return mData.get(position);
}

@Override
public long getItemId(int position) {
return position;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
int type = getItemViewType(position);
if (convertView == null) {
holder = new ViewHolder();
switch (type) {
case TYPE_ITEM:
convertView = mInflater.inflate(R.layout.item1, null);
holder.textView = (TextView)convertView.findViewById(R.id.text);
break;
case TYPE_SEPARATOR:
convertView = mInflater.inflate(R.layout.item2, null);
holder.textView = (TextView)convertView.findViewById(R.id.textSeparator);
break;
}
convertView.setTag(holder);
} else {
holder = (ViewHolder)convertView.getTag();
}
holder.textView.setText(mData.get(position));
return convertView;
}

}

public static class ViewHolder {
public TextView textView;
}

}