如何解决ListView项不会保持“选定”状态
| 我想在用户单击列表视图项目时更改其背景。有点像“蜂窝设置”页面（尽管我不只处理设置，所以我不使用PreferenceActivity）我通过资源状态选择器状态选择器来实现此功能，除了单击列表视图菜单更改的情况外列表视图右侧的线性布局（一种分屏视图）。我猜想listview失去了焦点，所以state_pressed不再成立。 <item android:state_pressed=\"true\">
<shape >
<solid android:color=\"@color/blue1\" />
</shape>
</item>
view.setBackgroundResource(R.color.red);
lv.invalidate()
lv.getChildAt(0).invalidate()
解决方法
当您从单元格中松开手指时，它不再显示为已按下状态。实际上，您要做的是在用户选择“是”时更改单个行的背景。这意味着实现onItemClick或onItemTouch并标记适配器以使用新背景重新绘制该行。如果您已经在使用自定义列表适配器，则可以在getView（）方法中对布尔值进行检查。您还需要跟踪哪些行被“选中”，哪些行未被“选中”。
伪代码：
public View getView(int pos,View convertView,ViewGroup parent) {
if(isChecked[pos]) //set background to checked color
}
<shape xmlns:android=\"http://schemas.android.com/apk/res/android\" android:shape=\"rectangle\">
<gradient android:angle=\"90\" android:startColor=\"#f5c98c\" android:endColor=\"#f7ddb8\"/>
</shape>
<shape xmlns:android=\"http://schemas.android.com/apk/res/android\" android:shape=\"rectangle\">
<gradient android:angle=\"90\" android:startColor=\"#fb9d23\" android:endColor=\"#ffc579\" />
</shape>
<selector xmlns:android=\"http://schemas.android.com/apk/res/android\">
<item android:state_pressed=\"true\" android:drawable=\"@drawable/list_selector_pressed\" />
<item android:state_focused=\"true\" android:drawable=\"@drawable/list_selector_focused\" />
<item android:drawable=\"@drawable/list_selector_focused\" />
</selector>
android:choiceMode=\"singleChoice\"
android:listSelector=\"@drawable/list_selector\"
package com.mypackage;
import java.util.Vector;
import com.myapp.R;
import com.myapp.data.Address;
import android.content.Context;
import android.graphics.Color;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
public class AddressesListAdapter extends BaseAdapter{
protected Context context;
protected LayoutInflater mInflater;
protected int itemResourceId;
protected Vector<Address> contentItems = new Vector<Address>();
protected Vector<Boolean> selectedStates;
private static final String TAG = \"myapp\";
public AddressesListAdapter(Context context,Vector<Address> contentItems) {
this.context = context;
this.contentItems = contentItems;
mInflater = LayoutInflater.from(context);
itemResourceId = R.layout.address_list_item;
selectedStates = new Vector<Boolean>();
//initial fill
clearSelectedState();
}
@Override
public int getCount() {
return contentItems.size();
}
@Override
public Object getItem(int position) {
return contentItems.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(final int position,ViewGroup parent) {
final ViewHolder holder;
if (convertView == null) {
convertView = mInflater.inflate(itemResourceId,null);
holder = new ViewHolder();
holder.addressName = (TextView) convertView.findViewById(R.id.addressName);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
Address address = (Address) contentItems.get(position);
holder.addressName.setText(address.getAddressName());
holder.addressName.setOnClickListener(new SetFocusListener(position));
//restore saved position from saving vector
if (selectedStates.get(position)) holder.addressName.setBackgroundColor(Color.BLUE);
else holder.addressName.setBackgroundColor(Color.TRANSPARENT);
return convertView;
}
private void clearSelectedState () {
selectedStates.clear();
for (int i = 0 ; i <= contentItems.size(); i++) {
selectedStates.add(new Boolean(false));
}
}
private class SetFocusListener implements View.OnClickListener {
private int position;
public SetFocusListener(int position) {
this.position = position;
}
@Override
public void onClick(View v) {
//clear selected state vector
clearSelectedState();
//set selected position
selectedStates.set(position,new Boolean(true));
//refresh adapter to redraw focus
notifyDataSetChanged();
}
}
static class ViewHolder {
TextView addressName;
}
}
<selector xmlns:android=\"http://schemas.android.com/apk/res/android\">
<item android:state_activated=\"true\" android:drawable=\"@android:drawable/list_activated_holo\" />
<item android:drawable=\"@color/transparent\" />
</selector>
listView.setItemChecked(position,true)
android:choiceMode
singleChoice
android:state_activated=\"true\"
state_selected
getView()
mListView.isItemChecked(position)
android:state_selected=\"true\"
android:background=\"?android:attr/activatedBackgroundIndicator\"
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