问题
I want to change the application's Locale (language) to change programmatically when user wants to switch between Hindi and English using change language button.
I have a code to change language in place but it works only when I call in in the onCreate() of an activity before setContentView() method.
Any help is much appreciated.
回答1:
See here my answer
Android Font in more then one langauge on single screen
for example if you want your application to support both English
and Arabic strings (in addition to the default strings),
you can simply create two additional
resource directories called /res/values-en (for the English strings.xml) and
/res/values-ar (for the Arabic strings.xml).
Within the strings.xml files, the
resource names are the same.
For example, the /res/values-en/strings.xml file could
look like this:
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="hello">Hello in English!</string>
</resources>
Whereas, the /res/values-ar/strings.xml file would look like this:
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="hello">مرحبا في اللغة الإنجليزية</string>
</resources>
also , the /res/values-ur_IN/strings.xml file would look like this for urdu:
ur_IN for india ur_PK for pakisthan
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="hello">انگریزی میں خوش!!</string>
</resources>
A default layout file in the /res/layout directory that displays the string refers to the string by the variable name @string/hello, without regard to which language or directory the string resource is in.
The Android operating system determines which version of the string (French, English, or default) to load at runtime.A layout with a TextView control to display the string might look like this:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TextView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:text="@string/hello" >
</LinearLayout>
The string is accessed programmatically in the normal way:
String str = getString(R.string.hello);
For change the language you need to like that change lang..
btn_english.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Locale locale = new Locale("en");
Locale.setDefault(locale);
Configuration config = new Configuration();
config.locale = locale;
getBaseContext().getResources().updateConfiguration(config, getBaseContext().getResources().getDisplayMetrics());
Toast.makeText(this, getResources().getString(R.string.lbl_langSelectEnglis), Toast.LENGTH_SHORT).show();
}
});
btn_arbice.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Locale locale = new Locale("ar");
Locale.setDefault(locale);
Configuration config = new Configuration();
config.locale = locale;
getBaseContext().getResources().updateConfiguration(config, getBaseContext().getResources().getDisplayMetrics());
Toast.makeText(this, getResources().getString(R.string.lbl_langSelecURdu), Toast.LENGTH_SHORT).show();
}
});
btn_urdu.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Locale locale = new Locale("ur_IN");
Locale.setDefault(locale);
Configuration config = new Configuration();
config.locale = locale;
getBaseContext().getResources().updateConfiguration(config, getBaseContext().getResources().getDisplayMetrics());
Toast.makeText(HomeActivity.this, getResources().getString(R.string.lbl_langSelectEnglis), Toast.LENGTH_SHORT).show();
}
});
回答2:
Try this function when click button.
public void changeLocale()
{
Resources res = getResources();
// Change locale settings in the app.
DisplayMetrics dm = res.getDisplayMetrics();
android.content.res.Configuration conf = res.getConfiguration();
conf.locale = new Locale("hi_IN");
res.updateConfiguration(conf, dm);
setContentView(R.layout.xxx);
}
回答3:
Use SharedPrefrences to save the user prefrences and call locale in onStart() not on onCreate(). This worked fine for me Define DEFAULT value, so that your app wont cash
public static final String Default="en"; //so if value isn't found then english language will be used.
protected void onStart() {
SharedPreferences sharedPreferences = this.getSharedPreferences("selectedLanguage", Context.MODE_PRIVATE);
String pine = sharedPreferences.getString("language", DEFAULT);
String languageToLoad = pine;
Locale locale = new Locale(languageToLoad);//Set Selected Locale
Locale.setDefault(locale);//set new locale as default
Configuration config = new Configuration();//get Configuration
config.locale = locale;//set config locale as selected locale
this.getResources().updateConfiguration(config, this.getResources().getDisplayMetrics());
invalidateOptionsMenu();
setTitle(R.string.app_name);
super.onStart();
}
Where I set sharedPrefrences value to hindi or english as per user choice. I used switch in this case. below you can see code.
aSwitch.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
if (aSwitch.isChecked()) {
SharedPreferences hisharedPreferences = getSharedPreferences("selectedLanguage", Context.MODE_PRIVATE);
SharedPreferences.Editor hieditor = npsharedPreferences.edit();
npeditor.putString("language","hi");
npeditor.commit();
aSwitch.setChecked(true);
Toast.makeText(Settings.this, "Hindi Language Selected", Toast.LENGTH_LONG).show();
} else {
SharedPreferences ensharedPreferences = getSharedPreferences("selectedLanguage", Context.MODE_PRIVATE);
SharedPreferences.Editor eneditor = ensharedPreferences.edit();
eneditor.putString("language","en");
eneditor.commit();
Toast.makeText(Settings.this, "English Language Selected", Toast.LENGTH_LONG).show();
aSwitch.setChecked(false);
}
}
});
Hope this helped!! Feel free to ask me if you got stuck in any step!!
来源：https://stackoverflow.com/questions/39158164/android-change-app-locale-manually-on-button-click