如何使用ArrayAdapter<myClass>
如何使用ArrayAdapter<myClass>
提问于 2010-02-15 19:48:50
ArrayList<MyClass> myList = new ArrayList<MyClass>();
ListView listView = (ListView) findViewById(R.id.list);
ArrayAdapter<MyClass> adapter = new ArrayAdapter<MyClass>(this, R.layout.row,
to, myList.);
listView.setAdapter(adapter);类: MyClass
class MyClass {
public String reason;
public long long_val;
}我在布局中创建了row.xml，但不知道如何使用ArrayAdapter在ListView中同时显示reason和long_val。
回答 3
Stack Overflow用户
回答已采纳
发布于 2010-02-15 19:57:36
为您的类实现自定义适配器：
public class MyClassAdapter extends ArrayAdapter<MyClass> {
private static class ViewHolder {
private TextView itemView;
}
public MyClassAdapter(Context context, int textViewResourceId, ArrayList<MyClass> items) {
super(context, textViewResourceId, items);
}
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
convertView = LayoutInflater.from(this.getContext())
.inflate(R.layout.listview_association, parent, false);
viewHolder = new ViewHolder();
viewHolder.itemView = (TextView) convertView.findViewById(R.id.ItemView);
convertView.setTag(viewHolder);
} else {
viewHolder = (ViewHolder) convertView.getTag();
}
MyClass item = getItem(position);
if (item!= null) {
// My layout has only one TextView
// do whatever you want with your string and long
viewHolder.itemView.setText(String.format("%s %d", item.reason, item.long_val));
}
return convertView;
}
}对于那些不太熟悉Android框架的人，这里有更详细的解释：https://github.com/codepath/android_guides/wiki/Using-an-ArrayAdapter-with-ListView。
Stack Overflow用户
发布于 2014-02-05 20:42:55
我认为这是最好的方法。使用泛型ArrayAdapter类并扩展您自己的对象适配器非常简单，如下所示：
public abstract class GenericArrayAdapter<T> extends ArrayAdapter<T> {
// Vars
private LayoutInflater mInflater;
public GenericArrayAdapter(Context context, ArrayList<T> objects) {
super(context, 0, objects);
init(context);
}
// Headers
public abstract void drawText(TextView textView, T object);
private void init(Context context) {
this.mInflater = LayoutInflater.from(context);
}
@Override public View getView(int position, View convertView, ViewGroup parent) {
final ViewHolder vh;
if (convertView == null) {
convertView = mInflater.inflate(android.R.layout.simple_list_item_1, parent, false);
vh = new ViewHolder(convertView);
convertView.setTag(vh);
} else {
vh = (ViewHolder) convertView.getTag();
}
drawText(vh.textView, getItem(position));
return convertView;
}
static class ViewHolder {
TextView textView;
private ViewHolder(View rootView) {
textView = (TextView) rootView.findViewById(android.R.id.text1);
}
}
}下面是您的适配器(示例)：
public class SizeArrayAdapter extends GenericArrayAdapter<Size> {
public SizeArrayAdapter(Context context, ArrayList<Size> objects) {
super(context, objects);
}
@Override public void drawText(TextView textView, Size object) {
textView.setText(object.getName());
}
}最后，如何初始化它：
ArrayList<Size> sizes = getArguments().getParcelableArrayList(Constants.ARG_PRODUCT_SIZES);
SizeArrayAdapter sizeArrayAdapter = new SizeArrayAdapter(getActivity(), sizes);
listView.setAdapter(sizeArrayAdapter);我已经用TextView布局重力可定制ArrayAdapter创建了一个Gist：
Stack Overflow用户
发布于 2012-08-02 06:23:20
如果您不想为扩展母类而烦恼，这里有一个快速而肮脏的示例，说明如何使用ArrayAdapter：
class MyClass extends Activity {
private ArrayAdapter<String> mAdapter = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
mAdapter = new ArrayAdapter<String>(getApplicationContext(),
android.R.layout.simple_dropdown_item_1line, android.R.id.text1);
final ListView list = (ListView) findViewById(R.id.list);
list.setAdapter(mAdapter);
//Add Some Items in your list:
for (int i = 1; i <= 10; i++) {
mAdapter.add("Item " + i);
}
// And if you want selection feedback:
list.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
//Do whatever you want with the selected item
Log.d(TAG, mAdapter.getItem(position) + " has been selected!");
}
});
}
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/2265661
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