方向变化的android语言环境变化

Question

在我的应用程序中，我有两个 Activity，一个可以向两侧旋转，另一个被锁定在横向模式。

以下是我的 list 文件详细信息，其中添加了 Activity

<activity
    android:name="com.hogaming.android.Activities.LoginActivity"
    android:configChanges="orientation|screenSize|keyboardHidden">
</activity>

<activity
    android:name="com.android.activities.MainActivity"
    android:configChanges="orientation|screenSize|keyboardHidden">
</activity>

在我使用微调器的登录 Activity 中，我正在更改语言环境并更新整个编辑文本和按钮文本。在按钮单击操作中，我正在更新 UI View ，当我旋转设备时，英语语言环境设置在更新的 View 上这是我的全部代码

public class LoginActivity extends Activity 
{
    Locale locale = null;
    Spinner langSpinner;
    private SharedPreferences langPrefs;
    String langSelected = "";
    int langPosition = 0;

    @Override
    public void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.loginscreen);

        langPrefs = PreferenceManager.getDefaultSharedPreferences(this);
        langSelected = langPrefs.getString(langPrefKey, "");
        langPosition = langPrefs.getInt(langPosKey, 0);

        langSpinner = (Spinner)this.findViewById(R.id.lanuage_spinner1);
        langSpinner.setSelection(langPosition);
        langSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() 
        {
            @Override
            public void onItemSelected(AdapterView<?> arg0, View arg1, int pos, long arg3) 
            {   
                if (pos == 0) 
                {
                    langSelected ="en";
                    locale = Locale.ENGLISH;
                }
                else if (pos == 1) 
                {
                    langSelected ="it";
                    locale = Locale.ITALIAN;
                } 
                else if (pos == 2) 
                {
                    langSelected ="zh";
                    locale = Locale.SIMPLIFIED_CHINESE;
                }               
                else if (pos == 3)
                {
                    langSelected ="zh-rTW";
                    locale = Locale.TRADITIONAL_CHINESE;
                }
                changeLang(langSelected, pos);
            }
            @Override
            public void onNothingSelected(AdapterView<?> arg0) {
                // TODO Auto-generated method stub

            }   
        });

        btnLogin = (Button) this.findViewById(R.id.LoginButton);
        btnLogin.setOnClickListener(new ButtonClickListener());
    }

    @Override
    protected void onStart() {
        super.onStart();
    }

    @Override
    protected void onStop() {
        super.onStop();
        this.finish();
    }

    @Override
    protected void onDestroy() 
    {
        super.onDestroy();
        this.finish();
    }

    public class ButtonClickListener implements OnClickListener {
        public void onClick(View v) {
                    final LoginTask validateTask = new LoginTask(context, usernameField.getText().toString(), passwordField.getText().toString());
                    validateTask.execute();
                }

                // Hide the keyboard
                InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
                imm.hideSoftInputFromWindow(passwordField.getWindowToken(), 0);
    }

    public class LoginTask extends AsyncTask<Void, Void, String> 
    {
        protected LoginActivity context;
        protected Exception exception;
        private String username;
        private String password;

        public LoginTask(LoginActivity context, String uname, String pwd) {
            this.context = context;
            this.username = uname;
            this.password = pwd;
        }

        @Override
        protected String doInBackground(Void... params) {
            try 
            {
                return HTTPHelper.LoginTaskData(this.context, username, password);
            }
            catch (Exception e) 
            {
                exception = e;
                Log.e(TAG, "Login Task Error", e);
            }
            return null;
        }

        @Override
        protected void onPostExecute(String result) 
        {
            super.onPostExecute(result);
            Log.e(TAG, "LoginTask: " + result);
            if (result.equals("true")) 
            {
                // moves to next activity
            }
            else if (result.equals("false"))
            {
                //showing an alert textview with selected language text
            }
        }
    }

    public void changeLang(String lang, int pos)
    {
        if (lang.length() != 0)
        {       
            saveLocale(lang, pos, locale);
            android.content.res.Configuration config = new android.content.res.Configuration();
            config.locale = locale;
            Locale.setDefault(locale);
            getBaseContext().getResources().updateConfiguration(config, getBaseContext().getResources().getDisplayMetrics());
            updateTexts();
        }
    }

    public void saveLocale(String lang, int pos, Locale locale)
    {
        SharedPreferences.Editor editor1 = langPrefs.edit();
        editor1.remove(langPrefKey);
        editor1.remove(langPosKey);
        editor1.commit();

        SharedPreferences.Editor editor = langPrefs.edit();
        editor.putString(langPrefKey, lang);
        editor.putInt(langPosKey, pos);
        editor.commit();

        langSelected = langPrefs.getString(langPrefKey, "");
        langPosition = langPrefs.getInt(langPosKey, 0);
    }

    private void updateTexts()
    {
        // here i will once again set all textview String values, it changes to the selected language
    }

    @Override
    public void onConfigurationChanged(android.content.res.Configuration newConfig) 
    {
        super.onConfigurationChanged(newConfig);
        if (locale != null){
            newConfig.locale = locale;
            Locale.setDefault(locale);
            getBaseContext().getResources().updateConfiguration(newConfig, getBaseContext().getResources().getDisplayMetrics());
        }
    }
}

Answer 1

如果我没理解错的话，问题是当你切换屏幕方向时手机的语言环境会恢复，尽管你有 android:configChanges="orientation|screenSize|keyboardHidden"，在你的 AndroidManifest.xml。如果我在你身边，我会从不同的角度处理这个问题。我会摆脱 android:configChanges，让 android 在方向改变时重新启动 Activity。然后，我将使用 onSaveInstanceState 对来保存用户在 Spinner 中选择的 Locale。当 onCreate 再次被调用时，你知道由于方向改变而被调用，因为 bundle 不为空，读取存储的 Locale 并重新启动，并再次更新配置。例如

@Override
public void onSaveInstanceState(Bundle savedInstanceState) {
    savedInstanceState.putSerializable("LOCALE", locale);
    super.onSaveInstanceState(savedInstanceState);
}

@Override
public void onCreate(Bundle savedInstanceState)  {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.loginscreen);
    if (savedInstanceState != null) {
        locale = (Locale) savedInstanceState.getSerializable("LOCALE");
        if (locale != null) {
           // update the configuration 
        }
    }