Java Android如何使用SharedReferences附加自定义listView

我想使用从API响应获取的SharedReferences更新我的ListView。。。 我是这样做的：

首先，我对字符串[]进行了初始化：

我想使用共享首选项更新此设置

这段代码永远不会刷新listview。。。我完全不知道如何使它更自动化。。每次当我在列表中添加其他内容时，例如First[]={“aaa”，“bbbb”}；它工作正常

有人能抽出时间帮忙吗

适配器：

class listDataAdapter extends ArrayAdapter<String> {

            Context context;
            String rFirst[];
            String rSecond[];
            String rThird[];
            String rFour[];
            Integer Five[];

            listDataAdapter(Context c, String rFirst[], String rSecond[], String rThird[], String rFour[], Integer Five[]) {
                super(c, R.layout.listview_row_orders, R.id.data_zal_text, rFirst);
                this.context = c;
                this.rFirst = rFirst;
                this.rSecond = rSecond;
                this.rThird = rThird;
                this.rFour = rFour;
                this.Five = Five;
            }

            @NonNull
            @Override
            public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
                LayoutInflater layoutInflater = (LayoutInflater) getApplicationContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                View row = layoutInflater.inflate(R.layout.listview_row_orders, parent, false);
                TextView myFirst = row.findViewById(R.id.data_zal_text_data);
                TextView mySecond = row.findViewById(R.id.data_rozl_text_data);
                TextView myThird = row.findViewById(R.id.place_zal_text_data);
                TextView myFour = row.findViewById(R.id.place_rozl_text_data);
                ProgressBar myOrderProgress = row.findViewById(R.id.progress_order_status);


                myFirst.setText(rFirst[position]);
                mySecond.setText(rSecond[position]);
                myThird.setText(rThird[position]);
                myFour.setText(rFour[position]);
                myOrderProgress.setProgress(Five[position]);

                return row;
            }
    ```

类listDataAdapter扩展了ArrayAdapter{
语境；
字符串rFirst[]；
字符串rSecond[]；
字符串rThird[]；
字符串rFour[]；
整数五[]；
listDataAdapter（上下文c，字符串rFirst[]，字符串rSecond[]，字符串rThird[]，字符串rFour[]，整数5[]）{
super（c，R.layout.listview_row_orders，R.id.data_zal_text，rffirst）；
this.context=c；
this.rFirst=rFirst；
this.rSecond=rSecond；
this.rThird=rThird；
this.rFour=rFour；
这个,五等于五,；
}
@非空
@凌驾
公共视图getView（int位置，@Nullable视图convertView，@NonNull视图组父级）{
LayoutInflater LayoutInflater=（LayoutInflater）getApplicationContext（）.getSystemService（Context.LAYOUT\u INFLATER\u SERVICE）；
视图行=LayoutFlater.inflate（R.layout.listview\u row\u orders，parent，false）；
TextView myFirst=row.findViewById（R.id.data_zal_text_data）；
TextView mySecond=row.findviewbyd（R.id.data\u rozl\u text\u data）；
TextView myThird=row.findviewbyd（R.id.place_zal_text_数据）；
TextView myFour=row.findviewbyd（R.id.place\u rozl\u text\u数据）；
ProgressBar myOrderProgress=row.findViewById（R.id.progress\u order\u status）；
myFirst.setText（rFirst[position]）；
mySecond.setText（rSecond[position]）；
myThird.setText（rThird[位置]）；
myFour.setText（rFour[位置]）；
myOrderProgress.setProgress（五个[位置]）；
返回行；
}
```

问题在于，您已经更新了活动中的值，但在适配器中仍然有旧值，因此notifyDataSetChanged将只使用相同的值，您需要用新的数组值替换适配器上的旧数组值，例如，您可以在适配器类中创建一个简单的帮助器方法来完成此操作

public void updateData（字符串[]firstArray）{
this.first=firstArray；
notifyDataSetChanged（）；
}

我不确定这里发生了什么。你能分享一下你的适配器代码吗？@Eselfar我用适配器代码编辑了我的问题：）请看一看这很好，但很难用静态值来自SharedReferences

SharedPreferences settings;
settings = getSharedPreferences("Number_List", Context.MODE_PRIVATE);

String uFirst = settings.getString("uFirst", "NONE");
String uSecond = settings.getString("uSecond", "NONE");
String uThird = settings.getString("uThird", "NONE");
String uFour = settings.getString("uFour", "NONE");
int uFive= settings.getInt("uFive", 0);

First = Arrays.copyOf(First, First.length + 1);
Second= Arrays.copyOf(Second, Second.length + 1);
Third= Arrays.copyOf(Third, Third.length + 1);
Four= Arrays.copyOf(Four, Four.length + 1);
Five= Arrays.copyOf(Five, Five.length + 1);

First[First.length -1] = uFirst;
Second[Second.length -1] = uSecond;
Third[Third.length -1] = uThird;
Four[Four.length -1] = uFour;
Five[Five.length -1] = uFive;

adapter.notifyDataSetChanged();

class listDataAdapter extends ArrayAdapter<String> {

            Context context;
            String rFirst[];
            String rSecond[];
            String rThird[];
            String rFour[];
            Integer Five[];

            listDataAdapter(Context c, String rFirst[], String rSecond[], String rThird[], String rFour[], Integer Five[]) {
                super(c, R.layout.listview_row_orders, R.id.data_zal_text, rFirst);
                this.context = c;
                this.rFirst = rFirst;
                this.rSecond = rSecond;
                this.rThird = rThird;
                this.rFour = rFour;
                this.Five = Five;
            }

            @NonNull
            @Override
            public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
                LayoutInflater layoutInflater = (LayoutInflater) getApplicationContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                View row = layoutInflater.inflate(R.layout.listview_row_orders, parent, false);
                TextView myFirst = row.findViewById(R.id.data_zal_text_data);
                TextView mySecond = row.findViewById(R.id.data_rozl_text_data);
                TextView myThird = row.findViewById(R.id.place_zal_text_data);
                TextView myFour = row.findViewById(R.id.place_rozl_text_data);
                ProgressBar myOrderProgress = row.findViewById(R.id.progress_order_status);


                myFirst.setText(rFirst[position]);
                mySecond.setText(rSecond[position]);
                myThird.setText(rThird[position]);
                myFour.setText(rFour[position]);
                myOrderProgress.setProgress(Five[position]);

                return row;
            }
    ```