使用字符串共享首选项更改字符串变量

Question

我想将一个字符串替换为从共享首选项中绘制的另一个字符串：

public class DisplayAdapter extends BaseAdapter {
    private final static String MY_PREFERENCES = "MyPref";
    private final static String GESTIONE = "Gestione";
    private Context mContext;
    private ArrayList<String> id;
    private ArrayList<String> gestioneName;


    public DisplayAdapter(Context c, ArrayList<String> gestione,ArrayList<String> id) {
        this.mContext = c;

        this.id = id;
        this.gestioneName = gestione;

    }

    public int getCount() {
        // TODO Auto-generated method stub
        return id.size();
    }

    public Object getItem(int position) {
        // TODO Auto-generated method stub
        return null;
    }

    public long getItemId(int position) {
        // TODO Auto-generated method stub
        return 0;
    }

    public View getView(int pos, View child, ViewGroup parent) {
        SharedPreferences prefs = getSharedPreferences(MY_PREFERENCES, Context.MODE_PRIVATE);
        String Gestione = prefs.getString(GESTIONE, "Entrata");
        Holder mHolder;
        LayoutInflater layoutInflater;
        if (child == null) {
            layoutInflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            child = layoutInflater.inflate(R.layout.row, null);
            mHolder = new Holder();
            mHolder.txt_gestione = (TextView) child.findViewById(R.id.txt_gestione);
            mHolder.txt_id = (TextView) child.findViewById(R.id.txt_id);

我想更换

String Gestione = "Entrata";

替换为：

SharedPreferences prefs = getSharedPreferences(MY_PREFERENCES, Context.MODE_PRIVATE);
String Gestione = prefs.getString(GESTIONE, "Entrata");

在Dispay适配器中，如果我将来自共享首选项类的数据字符串放入字符串行，这真是一个仙女错误，我该如何解决呢？

Answer 1

确保在适配器的构造函数中声明Context 。

private Context context

public CustomAdapter(Context ctx...) {
    this.context = ctx;
    ...
}

public View getView(int post, View child, ViewGroup parent) {
    SharedPreferences prefs = context.getSharedPreferences(MY_PREFERENCES, Context.MODE_PRIVATE);
    String Gestione = prefs.getString(GESTIONE, "Entrata");
    ...
}