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[英]How to rotate a list such that item selected from the list always gets the middle position in a list view
[英]Rotate telephone unselect my item in list View
當我旋轉手機時,在列表視圖中未選中所選項目。 這是我的適配器。 我只想更改所選項目的顏色(只能進行單選),並且當我旋轉手機時,我要查看選擇的內容。 現在,當我旋轉手機時,我看不到選擇項。
public class MainAdapter extends BaseAdapter {
private LayoutInflater inflater;
private Context context;
ArrayList<RowEntity> rowEntities;
public MainAdapter(Context context, ArrayList<RowEntity> rowEntities) {
this.context = context;
this.rowEntities = rowEntities;
inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public int getCount() {
return rowEntities.size();
}
@Override
public Object getItem(int position) {
return rowEntities.get(position);
}
@Override
public long getItemId(int position) {
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
final ViewHolder holder;
if (convertView == null) {
holder = new ViewHolder();
convertView = inflater.inflate(R.layout.main_row_holder, null);
holder.address = (TextView) convertView.findViewById(R.id.address);
holder.distance = (TextView) convertView.findViewById(R.id.tv_distance);
holder.description = (TextView) convertView.findViewById(R.id.description);
holder.name = (TextView) convertView.findViewById(R.id.name);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
RowEntity rowEntity = rowEntities.get(position);
if(rowEntity != null){
holder.address.setText(rowEntity.getAddress());
holder.address.setText(rowEntity.getAddress());
holder.distance.setText(rowEntity.getDistance() +"");
}
return convertView;
}
private class ViewHolder{
TextView address;
TextView distance;
TextView description;
TextView name;
}
}
這是我關於layout的listView:
<ListView
android:id="@+id/list"
android:layout_width="fill_parent"
android:layout_height="match_parent"
android:drawSelectorOnTop="false"
android:listSelector="@drawable/background_listview"
android:visibility="visible"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_above="@+id/bottomPanel" />
這是background_listview.xml:
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@color/white_background"
android:state_pressed="true" />
<item android:drawable="@color/primary_color"
android:state_focused="false" />
</selector>
我在清單上添加:
android:configChanges="keyboardHidden|orientation|screenSize"
當我旋轉手機時onCreate無法正常工作
將您的活動launchMode設置為singleTop
:
<activity android:launchMode="singleTop" >
</activity>
並覆蓋onNewIntent:
@Override
protected void onNewIntent(Intent intent) {
super.onNewIntent(intent);
//setIntent(intent);
}
這將重用活動堆棧中的活動。
發生這種情況是因為Android重新加載了布局(基本上是在配置更改時重新創建它。在您的情況下,這是屏幕的旋轉。
您可以通過在發生此問題的活動下的manifest.xml中應用以下屬性來防止android執行此操作
android:configChanges="orientation|screenSize"
這告訴android您要自己處理配置更改。
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