如何使用共享首选项在微调器中保存字符串值

Question

如何使用共享首选项在微调器中保存和加载字符串值 1.不能存储值
2.无法加载值

阵列

<string-array name="country_array">
    <item>Greece</item>
    <item>United Kingdom</item>
    <item>Italy</item>
    <item>France</item>
    <item>Germany</item>
    <item>Turkey</item>
    <item>Poland</item>
    <item>India</item>
</string-array>

Main.java

public class SaveSpinShared extends Activity implements OnItemSelectedListener {
    ArrayAdapter adapter;
    String getList, loadedList;
    String save;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.save_spin);

        SavePreferences("LIST", "France");

        // load
        LoadPreferences();
        getList = loadedList;

        Spinner sp = (Spinner) findViewById(R.id.SaveSpin);
        adapter = ArrayAdapter.createFromResource(this, R.array.country_array,
                android.R.layout.simple_spinner_item);
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        sp.setAdapter(adapter);

        //save
        Button buttonPlay = (Button) findViewById(R.id.btnSavespin);
        buttonPlay.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {

                SavePreferences("LIST", save);

            }
        });

    }

    @Override
    public void onItemSelected(AdapterView<?> parentView,
            View selectedItemView, int position, long id) {
        // TODO Auto-generated method stub

        save = parentView.getItemAtPosition(position).toString();
        Toast.makeText(parentView.getContext(), "Result : " + save,
                Toast.LENGTH_LONG).show();

    }

    @Override
    public void onNothingSelected(AdapterView<?> arg0) {
    }


    /* Save password */
    public void SavePreferences(String key, String value) {
        SharedPreferences data = PreferenceManager
                .getDefaultSharedPreferences(getApplicationContext());
        SharedPreferences.Editor editor = data.edit();
        editor.putString(key, value);
        editor.commit();
    }

    /* Load password */
    public void LoadPreferences() {
        SharedPreferences data = PreferenceManager
                .getDefaultSharedPreferences(getApplicationContext());
        loadedList = data.getString("LIST", "empty");
    }
} 

Answer 1

您不需要共享首选项来在微调器中加载值。您只需要在string.xml文件中声明数组并加载它。我给你我的代码。只需使用它。：

STEP-1：

在string.xml中声明spinner的数组（res-＆gt; values-＆gt; strings.xml）： -

<string-array name="country_array">
    <item>Greece</item>
    <item>United Kingdom</item>
    <item>Italy</item>
    <item>France</item>
    <item>Germany</item>
    <item>Turkey</item>
    <item>Poland</item>
    <item>India</item>
</string-array>

STEP-2：

在布局xml文件中声明Spinner小部件

<Spinner
     android:id="@+id/spinCountry"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:layout_marginTop="5dp"
     android:paddingLeft="8dp"
     android:popupBackground="@android:color/white"
     android:scrollbars="none"
     android:spinnerMode="dropdown" />

STEP-3：

在您的活动中声明微调器

Spinner spinCountry;
spinCountry= (Spinner) findViewById(R.id.spinCountry);//fetch the spinner from layout file
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
            android.R.layout.simple_spinner_item, getResources()
                    .getStringArray(R.array.country_array));//setting the country_array to spinner
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    spinCountry.setAdapter(adapter);
//if you want to set any action you can do in this listener
spinCountry.setOnItemSelectedListener(new OnItemSelectedListener() {
        @Override
        public void onItemSelected(AdapterView<?> arg0, View arg1,
                int position, long id) {
                  SavePreferences("LIST",spinCountry.getSelectedItem().toString());
        }

        @Override
        public void onNothingSelected(AdapterView<?> arg0) {
        }
    });

Answer 2

你不能使用sharepreferences。它存储的数据非常小，几乎原始数据不是数组值（对象）。我希望你能理解。