Question

我想做一个简单的本地化演示，我有一个微调器来选择语言和文本视图来显示所需语言的字符串，这是我的代码

public class MainActivity extends Activity implements OnItemSelectedListener
{
    Spinner laguageSpinner;

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        laguageSpinner = laguageSpinner = ((Spinner) findViewById(R.id.spinner1));
        laguageSpinner.setOnItemSelectedListener(this);
        generateLanguageItems();
    }
    public void generateLanguageItems()
    {
        laguageSpinner = laguageSpinner = ((Spinner) findViewById(R.id.spinner1));
        List<String> list = new ArrayList<String>();
        list.add("English");
        list.add("عربي");
        ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this,
                R.layout.el_spinner_txtview, list);
        dataAdapter
                .setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        laguageSpinner.setAdapter(dataAdapter);
    }

    @Override
    public void onItemSelected(AdapterView<?> adapter, View arg1, int pos,
            long arg3)
    {
        Toast.makeText(this, adapter.getItemAtPosition(pos) + "",
                2000).show();
        switch(pos)
        {case 0:    changeLocale( "en" );break;
        case 1:     changeLocale( "ar" );break;}
    }

    public void changeLocale( String code )
    {
        Locale locale = new Locale(code); 
        Locale.setDefault(locale);
        Configuration config = new Configuration();
        config.locale = locale;
        getBaseContext().getResources().updateConfiguration(config, 
        getBaseContext().getResources().getDisplayMetrics());
        this.setContentView(R.layout.activity_main);
        generateLanguageItems();
    }
}

本地化更改代码完美运行，我通过更改此

进行了测试

    switch(pos)
    {case 0:    changeLocale( "en" );break;
    case 1:     changeLocale( "ar" );break;}

到那个

    switch(pos)
    {case 0:    changeLocale( "ar" );break;
    case 1:     changeLocale( "en" );break;}

我的问题是旋转器项目在运行时不再生成我有一个空的微调器，试图对代码进行一些更改但没有运气，你能帮助我吗？

--- --- EDIT 事实上我试过这个

public void generateLanguageItems()
{
    ....
    laguageSpinner = ((Spinner) findViewById(R.id.spinner1));
    laguageSpinner.setAdapter(dataAdapter);
}

这种方式可以生成微调器项，但onItemSelected()不再触发，然后我添加了

public void generateLanguageItems()
{
            ...
    laguageSpinner.setOnItemSelectedListener(null);
    laguageSpinner = ((Spinner) findViewById(R.id.spinner1));
    laguageSpinner.setAdapter(dataAdapter);
    laguageSpinner.setOnItemSelectedListener(this);
}

现在它以递归方式触发，我无法点击微调器并为其项目充气！

Answer 1

为什么你有这个双重任务：

laguageSpinner = laguageSpinner = ((Spinner) findViewById(R.id.spinner1));

将其更改为

laguageSpinner = (Spinner) findViewById(R.id.spinner1);

再试一次。

Answer 2

我添加了一个破坏递归的条件，这是工作代码

public class MainActivity extends Activity implements OnItemSelectedListener
{
    Spinner laguageSpinner;
    int currentLocale=0;

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        laguageSpinner = ((Spinner) findViewById(R.id.spinner1));
        laguageSpinner.setOnItemSelectedListener(this);
        generateLanguageItems(0);
    }
    public void generateLanguageItems(int pos)
    {
        List<String> list = new ArrayList<String>();
        list.add("English");
        list.add("عربي");
        ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this,
                R.layout.el_spinner_txtview, list);
        dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        laguageSpinner.setOnItemSelectedListener(null);
        laguageSpinner = ((Spinner) findViewById(R.id.spinner1));
        laguageSpinner.setAdapter(dataAdapter);
        laguageSpinner.setOnItemSelectedListener(this);
        laguageSpinner.setSelection(pos);
        currentLocale = pos;
    }

    @Override
    public void onItemSelected(AdapterView<?> adapter, View arg1, int pos, long arg3)
    {   changeLocale(  pos );   }

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

    public void changeLocale( int pos )
    {
        if ( currentLocale == pos)
            return;
        Locale locale;
        if (pos == 0)
            locale = new Locale("en");
        else
            locale = new Locale("ar");
        Locale.setDefault(locale);
        Configuration config = new Configuration();
        config.locale = locale;
        getBaseContext().getResources().updateConfiguration(config, 
                getBaseContext().getResources().getDisplayMetrics());
        this.setContentView(R.layout.activity_main);
        generateLanguageItems(pos);
    }
}

更改本地化时不会生成Android微调器项

2 个答案: