我需要应用程序中的设置，这些设置将在几个命名空间中可用（都在一个项目中）。我决定使用以下方法创建类：
private SharedPreferences prefs;
private Context context;
public Preferenses(Context context){
this.context=context;
}
public void invertLanguageState(String lang){
prefs=context.getSharedPreferences(LEARN_WORDS_PREFS, Context.MODE_PRIVATE);
boolean state=prefs.getBoolean(lang, false);
Editor editor=prefs.edit();
editor.putBoolean(lang,!state);
editor.commit();
}
public void setLanguagesStates(String []langs,boolean []states){
prefs=context.getSharedPreferences(LEARN_WORDS_PREFS, Context.MODE_PRIVATE);
Editor editor=prefs.edit();
final int size=states.length;
for(int i=0;i<size;i++){
editor.putBoolean(langs[i],states[i]);
}
editor.commit();
}
public boolean [] getLanguagesStates(String []keys){
prefs=context.getSharedPreferences(LEARN_WORDS_PREFS,Context.MODE_PRIVATE);
final int size=keys.length;
boolean [] states=new boolean[size];
for(int i=0;i<size;i++){
states[i]=prefs.getBoolean(keys[i], false);
}
return states;
}
然后我尝试将它用于 ListActivity，我编写了我的适配器代码：
public class UsableLanguagesAdapter extends ArrayAdapter<String>{
private final Context context;
private final String [] values;
private boolean [] states; // language states in checkbox (select or not)
private Preferenses prefs;
public UsableLanguagesAdapter(Context context,String []values) {
super(context,RProvider.getLanguageUserItem(),values);
this.context=context;
this.values=values;
this.prefs=new Preferenses(context);
this.states=prefs.getLanguagesStates(values);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View rowView = inflater.inflate(RProvider.getLanguageUserItem(), parent, false);
CheckBox checkBox=(CheckBox) rowView.findViewById(RProvider.getLanguageItemCheckBox());
TextView textView = (TextView) rowView.findViewById(RProvider.getLanguageItemText());
ImageView imageView = (ImageView) rowView.findViewById(RProvider.getLanguageItemImage());
imageView.setImageResource(RProvider.getLangImageId(values[position]));
textView.setText(values[position]);
checkBox.setSelected(states[position]);
final int pos=position;
checkBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView,boolean isChecked) {
Boolean state=prefs.getLangugeState(values[pos]);
Log.d(state.toString(),"show state");
prefs.invertLanguageState(values[pos]);
state=prefs.getLangugeState(values[pos]);
Log.d(state.toString(),"show state");
///checkBox.setSelected(isChecked);
}
});
return rowView;
}
}
但是当我重新加载活动时，所有复选框都未选中。你能告诉我如何决定这个问题吗？这个结果在其他活动中也是必要的。