使用首选项 [android] 在运行时间内更改语言

Question

为此，我阅读了几次 official guide 以及许多其他内容，例如本网站上的问题，但我无法 100% 完成我的工作

截至目前，如果我更改列表首选项中的语言，activity (SettingsActivity) 将不会自行更新（大约 20 次中有 1 次，不知何故会，不知道为什么）。按下后退按钮后，我的 MainActivity 也没有更新。但是我所有其他 activitys 总是显示正确的语言，如果我返回到 SettingsActivity 就没问题了，与 MainActivity 一样，如果我重新启动应用程序。

相关部分：

主要活动：

public class MainActivity extends Activity {

public static final String KEY_PREF_LANGUAGE = "pref_language";

@Override
protected void onCreate(Bundle savedInstanceState) {
    ...
    PreferenceManager.setDefaultValues(this, R.xml.preferences, false);
}

@Override
protected void onResume() {
    super.onResume();
    SharedPreferences sharedPref = PreferenceManager.getDefaultSharedPreferences(this);

    String languagePref_ID = sharedPref.getString(KEY_PREF_LANGUAGE, "2");
    switch (languagePref_ID) {
        case "1":
            Locale localeEN = new Locale("en_US");
            setLocale(localeEN);
            break;
        case "2":
            Locale localeHU = new Locale("hu_HU");
            setLocale(localeHU);
            break;

    }
}


public void setLocale(Locale locale) {
    Locale.setDefault(locale);
    Resources res = getResources();
    DisplayMetrics dm = res.getDisplayMetrics();
    Configuration conf = res.getConfiguration();
    conf.locale = locale;
    res.updateConfiguration(conf, dm);
    //recreate();
    //finish();
    //startActivity(getIntent());
    //if these are not commented, main activity wont show at start at all
}

设置活动

public class SettingsActivity extends PreferenceActivity implements SharedPreferences.OnSharedPreferenceChangeListener {

public static final String KEY_PREF_LANGUAGE = "pref_language";

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    getFragmentManager().beginTransaction()
            .replace(android.R.id.content, new SettingsFragment())
            .commit();
    SharedPreferences sharedPref = PreferenceManager.getDefaultSharedPreferences(this);
    SharedPreferences.OnSharedPreferenceChangeListener listener =
            new SharedPreferences.OnSharedPreferenceChangeListener() {
                public void onSharedPreferenceChanged(SharedPreferences prefs, String key) {
                    if (key.equals(KEY_PREF_LANGUAGE)) {
                        String languagePref_ID = prefs.getString(SettingsActivity.KEY_PREF_LANGUAGE, "");
                        switch (languagePref_ID) {
                            case "1":
                                Locale localeEN = new Locale("en_US");
                                setLocale(localeEN);
                                break;
                            case "2":
                                Locale localeHU = new Locale("hu_HU");
                                setLocale(localeHU);
                                break;

                        }
                    }
                }
            };
    sharedPref.registerOnSharedPreferenceChangeListener(listener);
}


public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
    if (key.equals(KEY_PREF_LANGUAGE)) {
        String languagePref_ID = sharedPreferences.getString(SettingsActivity.KEY_PREF_LANGUAGE, "2");
        switch (languagePref_ID) {
            case "1":
                Locale localeEN = new Locale("en_US");
                setLocale(localeEN);
                break;
            case "2":
                Locale localeHU = new Locale("hu_HU");
                setLocale(localeHU);
                break;

        }
    }
    //this doenst even get called but i need it for the implementation
}

public void setLocale(Locale locale) {
    Locale.setDefault(locale);
    Resources res = getResources();
    DisplayMetrics dm = res.getDisplayMetrics();
    Configuration conf = res.getConfiguration();
    conf.locale = locale;
    res.updateConfiguration(conf, dm);
    recreate(); //tried like 4 ways to do this, nothing really worked
    //finish();
    //startActivity(getIntent());
}
}

SettingsFragment.java

public class SettingsFragment extends PreferenceFragment {


@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // Load the preferences from an XML resource
    addPreferencesFromResource(R.xml.preferences);

}
}

AndroidManifest.xml

android:configChanges="locale|orientation" //added to main and settings activity

我对此感到很疯狂，这是最好的工作状态，但我知道这里的 activity 生命周期管理远非最佳，当我尝试这些时，我无法得到它正常工作。我怎样才能使这项工作真正在所有活动的运行时间更新？

Answer 1

更改语言后，如果您还想看到更改后的语言，则需要重新启动当前的 activity。例如像这样：

private void restartActivity() {
    Intent intent = getIntent();
    finish();
    startActivity(intent);
}

在这里查看最佳答案How to refresh activity after changing language (Locale) inside application

Answer 2

最后我没有使用片段就让它工作了。所以这里有一些不推荐使用的方法，我也尝试过片段，但没有完全成功（还）。此代码总是在更改后刷新 SettingsActivity，而 MainActivity 自行更新太正确了。

MainActivity

public class MainActivity extends Activity {

public static final String KEY_PREF_LANGUAGE = "pref_language";
public String languagePref_ID;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    PreferenceManager.setDefaultValues(this, R.xml.preferences, false);
    SharedPreferences sharedPref = PreferenceManager.getDefaultSharedPreferences(this);
    languagePref_ID = sharedPref.getString(KEY_PREF_LANGUAGE, "2");
    switch (languagePref_ID) {
        case "1":
            Locale localeEN = new Locale("en_US");
            setLocaleOnCreate(localeEN);
            break;
        case "2":
            Locale localeHU = new Locale("hu_HU");
            setLocaleOnCreate(localeHU);
            break;

    }
    setContentView(R.layout.activity_main);
    ....
}
@Override
protected void onResume() {
    super.onResume();
    SharedPreferences sharedPref = PreferenceManager.getDefaultSharedPreferences(this);
    String languagePref_ID_RES = sharedPref.getString(KEY_PREF_LANGUAGE, "2");
    if(!languagePref_ID.equals(languagePref_ID_RES)){
        languagePref_ID_RES = languagePref_ID;
        switch (languagePref_ID_RES) {
            case "1":
                Locale localeEN = new Locale("en_US");
                setLocale(localeEN);
                break;
            case "2":
                Locale localeHU = new Locale("hu_HU");
                setLocale(localeHU);
                break;

        }
    }
}
    public void setLocaleOnCreate(Locale locale) {
    Locale.setDefault(locale);
    Resources res = getResources();
    DisplayMetrics dm = res.getDisplayMetrics();
    Configuration conf = res.getConfiguration();
    conf.locale = locale;
    res.updateConfiguration(conf, dm);
}

public void setLocale(Locale locale) {
    Locale.setDefault(locale);
    Resources res = getResources();
    DisplayMetrics dm = res.getDisplayMetrics();
    Configuration conf = res.getConfiguration();
    conf.locale = locale;
    res.updateConfiguration(conf, dm);
    recreate();
    //finish();
    //startActivity(getIntent());
}
  ....

    public void startSettingsActivity(View view) {
    Intent intent = new Intent(this, SettingsActivity.class);
    startActivity(intent);
  }
}

设置活动

public class SettingsActivity extends PreferenceActivity implements SharedPreferences.OnSharedPreferenceChangeListener {

public static final String KEY_PREF_LANGUAGE = "pref_language";
public String languagePref_ID;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);


    SharedPreferences sharedPref = PreferenceManager.getDefaultSharedPreferences(this);
    SharedPreferences.OnSharedPreferenceChangeListener listener =
            new SharedPreferences.OnSharedPreferenceChangeListener() {
                public void onSharedPreferenceChanged(SharedPreferences prefs, String key) {
                    if (key.equals(KEY_PREF_LANGUAGE)) {
                        languagePref_ID = prefs.getString(SettingsActivity.KEY_PREF_LANGUAGE, "2");
                        switch (languagePref_ID) {
                            case "1":
                                Locale localeEN = new Locale("en_US");
                                setLocale(localeEN);
                                break;
                            case "2":
                                Locale localeHU = new Locale("hu_HU");
                                setLocale(localeHU);
                                break;
                        }
                    }
                }
            };
    sharedPref.registerOnSharedPreferenceChangeListener(listener);
    addPreferencesFromResource(R.xml.preferences);
}

@Override
protected void onResume() {
    super.onResume();
    getPreferenceScreen().getSharedPreferences().registerOnSharedPreferenceChangeListener(this);
}

@Override
protected void onPause() {
    super.onPause();
    getPreferenceScreen().getSharedPreferences().unregisterOnSharedPreferenceChangeListener(this);
}

public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
    if (key.equals(KEY_PREF_LANGUAGE)) {
        languagePref_ID = sharedPreferences.getString(SettingsActivity.KEY_PREF_LANGUAGE, "2");
        switch (languagePref_ID) {
            case "1":
                Locale localeEN = new Locale("en_US");
                setLocale(localeEN);
                break;
            case "2":
                Locale localeHU = new Locale("hu_HU");
                setLocale(localeHU);
                break;
        }
    }
}

public void setLocale(Locale locale) {
    Locale.setDefault(locale);
    Resources res = getResources();
    DisplayMetrics dm = res.getDisplayMetrics();
    Configuration conf = res.getConfiguration();
    conf.locale = locale;
    res.updateConfiguration(conf, dm);
    recreate();
 }
}

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