How to change language of app when user selects la

问题:

I want my app to support three languages Spanish,Portuguese & English. And give option to select language in app.I have made

1) 3 drawable folders drawable-es,drawable-pt,drawable.

2) 3 values folder values-es,values-pt,values.Change String.xml values according to languages.

I have imageView to select language.When click it menu open that consists option English,Spanish,Portuguese.

I set Locale inside app on option selection by this code

public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
        case R.id.en:
             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, \"Locale in English !\", Toast.LENGTH_LONG).show();
             break;

        case R.id.pt:
             Locale locale2 = new Locale(\"pt\"); 
             Locale.setDefault(locale2);
             Configuration config2 = new Configuration();
             config2.locale = locale2;
             getBaseContext().getResources().updateConfiguration(config2, getBaseContext().getResources().getDisplayMetrics());

             Toast.makeText(this, \"Locale in Portugal !\", Toast.LENGTH_LONG).show();
             break;

        case R.id.es:
             Locale locale3 = new Locale(\"es\"); 
             Locale.setDefault(locale3);
             Configuration config3 = new Configuration();
             config3.locale = locale3;
             getBaseContext().getResources().updateConfiguration(config3, getBaseContext().getResources().getDisplayMetrics());

             Toast.makeText(this, \"Locale in Spain !\", Toast.LENGTH_LONG).show();
             break;


    }
         return super.onOptionsItemSelected(item);
}

I have declare in Manifest- android:configChanges=\"locale\"

It work but it have some issue.

Problem:-

1)When language selected, screen that consists image of language selection not change but other screens are change.

2)After orientation change app restore language according to locale of phone.

回答1:

It\'s excerpt for the webpage: http://android.programmerguru.com/android-localization-at-runtime/

It\'s simple to change the language of your app upon user selects it from list of languages. Have a method like below which accepts the locale as String (like \'en\' for English, \'hi\' for hindi), configure the locale for your App and refresh your current activity to reflect the change in language. The locale you applied will not be changed until you manually change it again.

public void setLocale(String lang) { 
    Locale myLocale = new Locale(lang); 
    Resources res = getResources(); 
    DisplayMetrics dm = res.getDisplayMetrics(); 
    Configuration conf = res.getConfiguration(); 
    conf.locale = myLocale; 
    res.updateConfiguration(conf, dm); 
    Intent refresh = new Intent(this, AndroidLocalize.class); 
    startActivity(refresh); 
    finish();
} 

Make sure you imported following packages:

import java.util.Locale; 
import android.os.Bundle; 
import android.app.Activity; 
import android.content.Intent; 
import android.content.res.Configuration; 
import android.content.res.Resources; 
import android.util.DisplayMetrics; 

add in manifest to activity android:configChanges=\"locale|orientation\"

回答2:

You should either remove android:configChanges=\"locale\" from manifest, which will cause activity to reload, or override onConfigurationChanged method:

@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
    // your code here, you can use newConfig.locale if you need to check the language
    // or just re-set all the labels to desired string resource
}

回答3:

Good solutions explained pretty well here. But Here is one more.

Create your own CustomContextWrapper class extending ContextWrapper and use it to change Locale setting for the complete application. Here is a GIST with usage.

And then call the CustomContextWrapper with saved locale identifier e.g. \'hi\' for Hindi language in activity lifecycle method attachBaseContext. Usage here:

@Override
protected void attachBaseContext(Context newBase) {
//fetch from shared preference also save to the same when applying. default here is en = English
    String language = MyPreferenceUtil.getInstance().getString(\"saved_locale\", \"en\");
    super.attachBaseContext(SnapContextWrapper.wrap(newBase, language));
}

回答4:

Udhay\'s sample code works well. Except the question of Sofiane Hassaini and Chirag SolankI, for the re-entrance, it doesn\'t work. I try to call Udhay\'s code without restart the activity in onCreate() , before super.onCreate(savedInstanceState);. Then it is OK! Only a little problem, the menu strings still not changed to the set Locale.

    public void setLocale(String lang) { //call this in onCreate()
     Locale myLocale = new Locale(lang); 
     Resources res = getResources(); 
     DisplayMetrics dm = res.getDisplayMetrics(); 
     Configuration conf = res.getConfiguration(); 
     conf.locale = myLocale; 
     res.updateConfiguration(conf, dm); 
     //Intent refresh = new Intent(this, AndroidLocalize.class); 
     //startActivity(refresh); 
     //finish();
} 

回答5:

all above code is perfect but only one this is missing mine was not working just because the language was not mentioned in the config file

 defaultConfig {

    resConfigs \"en\", \"hi\", \"kn\"

}

after that, all languages started running