CODEWITHSUNDEEP
javaandroidandroid-studio
mafortis
mafortis

Reputation: 7138

appLocale setting in android studio

I have made radio group where user can select their desire language and app language changes to selected language but i am not able to use the functions (not sure how to!)

What I did?

  1. I've made settingsActivity
  2. I've added radio group
  3. I've wrote setAppLocale function
  4. I've set onRadioButtonClicked to change languages

Code

settingsActivity.java

package com.xxxxxx.xxxxx;

import android.content.res.Configuration;
import android.content.res.Resources;
import android.os.Build;
import android.os.Bundle;

import androidx.appcompat.app.ActionBar;
import androidx.appcompat.app.AppCompatActivity;
import androidx.preference.PreferenceFragmentCompat;

import android.util.DisplayMetrics;
import android.view.View;
import android.widget.RadioButton;

import java.util.Locale;

public class SettingsActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.settings_activity);
        getSupportFragmentManager()
                .beginTransaction()
                .replace(R.id.settings, new SettingsFragment())
                .commit();
        ActionBar actionBar = getSupportActionBar();
        if (actionBar != null) {
            actionBar.setDisplayHomeAsUpEnabled(true);
        }
    }

    public static class SettingsFragment extends PreferenceFragmentCompat {
        @Override
        public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
            setPreferencesFromResource(R.xml.root_preferences, rootKey);
        }
    }


    //locale settings
    public void setAppLocale(String localeCode) {
        Resources res = getResources();
        DisplayMetrics dm = res.getDisplayMetrics();
        Configuration conf = res.getConfiguration();
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
            conf.setLocale(new Locale(localeCode.toLowerCase()));
        } else {
            conf.locale = new Locale(localeCode.toLowerCase());
        }

        res.updateConfiguration(conf, dm);
    }

    // application language switch
    public void onRadioButtonClicked(View view) {
        // Is the button now checked?
        boolean checked = ((RadioButton) view).isChecked();

        // Check which radio button was clicked
        switch(view.getId()) {
            case R.id.radio_indo:
                if (checked)
                    setAppLocale("id");
                    break;
            case R.id.radio_english:
                if (checked)
                    setAppLocale("en");
                    break;
        }
    }

}

settings_activity.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/settings">


    <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginEnd="4sp"
            android:layout_marginRight="4sp"
            android:weightSum="3"
            android:gravity="center"
            android:orientation="horizontal">

        <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:orientation="vertical">

            <RadioGroup
                    android:id="@+id/appLang"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:gravity="center"
                    android:layout_marginTop="35dp"
                    android:layout_marginEnd="35dp"
                    android:layout_marginRight="35dp"
                    android:layout_marginStart="35dp"
                    android:layout_marginLeft="35dp"
                    android:orientation="horizontal">

                <TextView
                        android:id="@+id/applangtext"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_weight="1"
                        android:text="@string/applangtextstring" />

                <RadioButton
                        android:id="@+id/radio_indo"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:onClick="onRadioButtonClicked"
                        android:text="@string/indoLang" />

                <RadioButton
                        android:id="@+id/radio_english"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:onClick="onRadioButtonClicked"
                        android:text="@string/englishLang" />

            </RadioGroup>
        </LinearLayout>

    </LinearLayout>
</RelativeLayout>

Question

I need to make 2 things happen in my java file:

  1. Mark current language radio input as selected
  2. Make changes when user select another radio button

The question is how do I connect onRadioButtonClicked to setAppLocale? as well as return current language onCreate in order to show current language selected?

Update

Based on answer below here is my latest update and extra files that I've added. Yet my language switch doesn't work

settingsActivity.java

import android.content.res.Configuration;
import android.content.res.Resources;
import android.os.Build;
import android.os.Bundle;
import androidx.appcompat.app.AppCompatActivity;
import androidx.preference.PreferenceFragmentCompat;
import android.util.DisplayMetrics;
import android.view.View;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import java.util.Locale;

public class SettingsActivity extends AppCompatActivity {

    PrefManager prefManager; //added
    RadioButton radio_indo, radio_english; //added
    RadioGroup appLang; //added

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.settings_activity);

        //added
        prefManager = new PrefManager(this);

        radio_indo = findViewById(R.id.radio_indo);
        radio_english = findViewById(R.id.radio_english);
        appLang = findViewById(R.id.appLang);

        if (prefManager.getLanguage().equals("en")) {
            radio_english.setChecked(true);
        } else {
            radio_english.setChecked(true);
        }

        // application language switch (added)
        appLang.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup radioGroup, int checkId) {
                switch (checkId) {
                    case R.id.radio_indo:
                        prefManager.setLanguage("id");
                        // you need to restart or recreate your activity after locale change
                        break;
                    case R.id.radio_english:
                        prefManager.setLanguage("en");
                        // you need to restart or recreate your activity after locale change
                        break;
                }
            }
        });

    }

    public static class SettingsFragment extends PreferenceFragmentCompat {
        @Override
        public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
            setPreferencesFromResource(R.xml.root_preferences, rootKey);
        }
    }


    //locale settings
    public void setAppLocale(String localeCode) {
        Resources res = getResources();
        DisplayMetrics dm = res.getDisplayMetrics();
        Configuration conf = res.getConfiguration();
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
            conf.setLocale(new Locale(localeCode.toLowerCase()));
        } else {
            conf.locale = new Locale(localeCode.toLowerCase());
        }

        res.updateConfiguration(conf, dm);
    }

     // removed my old function as new function added to onCreate

}

PrefManager.java added class

import android.content.Context;
import android.content.SharedPreferences;

public class PrefManager {
    private SharedPreferences.Editor editor;
    private Context mContext;
    private SharedPreferences prefs;
    private final String LANGUAGE = "language";
    private final String PREF = "user_data";

    public PrefManager(Context mContext) {
        this.mContext = mContext;
    }

    public String getLanguage() {
        this.prefs = this.mContext.getSharedPreferences(PREF, 0);
        return this.prefs.getString(LANGUAGE, "en");
    }

    public void setLanguage(String language) {
        this.editor = this.mContext.getSharedPreferences(PREF, 0).edit();
        this.editor.putString(LANGUAGE, language);
        this.editor.apply();
    }
}

BaseActivity.java added class

import android.content.Context;

import androidx.appcompat.app.AppCompatActivity;
import java.util.Locale;

/**
 * Created by nilesh on 20/3/18.
 */

public class BaseActivity extends AppCompatActivity {

    @Override
    protected void attachBaseContext(Context newBase) {

        Locale newLocale;

        String lang = new PrefManager(newBase).getLanguage();

        if (lang.equals("en")) {
            newLocale = new Locale("en");
        } else {
            newLocale = new Locale(lang);
        }


        Context context = ContextWrapper.wrap(newBase, newLocale);
        super.attachBaseContext(context);
    }
}

settings_activity.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/settings">


    <RadioGroup
            android:id="@+id/appLang"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginStart="35dp"
            android:layout_marginLeft="35dp"
            android:layout_marginTop="90dp"
            android:layout_marginEnd="35dp"
            android:layout_marginRight="35dp"
            android:gravity="center"
            android:orientation="horizontal">

        <TextView
                android:id="@+id/applangtext"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="@string/applangtextstring" />

        <RadioButton
                android:id="@+id/radio_indo"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/indoLang" />

        <RadioButton
                android:id="@+id/radio_english"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/englishLang" />

    </RadioGroup>
</RelativeLayout>

This is all I have regarding to language switch.

PS-1: based on provided solution in answer comments I should have add BaseActivity as extends in all my activites but as all my activities are kotlin not java (except settingsActivity) I was not able to add it.

PS-2: even if not getting translatations is because I couldn't add extends at very least I should be able to see translations in my settingsActivity which is java right?

Any idea why this switch doesn't work?

Upvotes: 0

Views: 399

Answers (1)

AskNilesh
AskNilesh

Reputation: 69734

NOTE

You can download source code from github repo

Mark current language radio input as selected

Then you need to save your locale change flag/state inside SharedPreferences

SAMPLE CODE follow these steps

Create one class name PrefManager

import android.content.Context;
import android.content.SharedPreferences;

public class PrefManager {
    private SharedPreferences.Editor editor;
    private Context mContext;
    private SharedPreferences prefs;
    private final String LANGUAGE = "language";
    private final String PREF = "user_data";

    public PrefManager(Context mContext) {
        this.mContext = mContext;
    }

    public String getLanguage() {
        this.prefs = this.mContext.getSharedPreferences(PREF, 0);
        return this.prefs.getString(LANGUAGE, "en");
    }

    public void setLanguage(String language) {
        this.editor = this.mContext.getSharedPreferences(PREF, 0).edit();
        this.editor.putString(LANGUAGE, language);
        this.editor.apply();
    }
}

Now add below code/ condition in your settingsActivity.java

public class JavaActivity extends AppCompatActivity {

    PrefManager prefManager;
    RadioButton radio_indo, radio_english;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_java);
        prefManager = new PrefManager(this);
        radio_indo = findViewById(R.id.radio_indo);
        radio_english = findViewById(R.id.radio_english);

        if (prefManager.getLanguage().equals("en")) {
            radio_english.setChecked(true);
        } else {
            radio_english.setChecked(true);
        }
    }

}

Make changes when user select another radio button

  • When the user changes the language you need to update it SharedPreferences
  • You need to restart or recreate your activity after locale change

Note : you should use RadioGroup.OnCheckedChangeListener() instead of android:onClick="onRadioButtonClicked"

SAMPLE CODE

public class JavaActivity extends AppCompatActivity {

    PrefManager prefManager;
    RadioButton radio_indo, radio_english;
    RadioGroup appLang;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_java);
        prefManager = new PrefManager(this);

        radio_indo = findViewById(R.id.radio_indo);
        radio_english = findViewById(R.id.radio_english);
        appLang = findViewById(R.id.appLang);

        if (prefManager.getLanguage().equals("en")) {
            radio_english.setChecked(true);
        } else {
            radio_english.setChecked(true);
        }

        appLang.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup radioGroup, int checkId) {
                switch (checkId) {
                    case R.id.radio_indo:
                        prefManager.setLanguage("id");
                        // you need to restart or recreate your activity after locale change
                        break;
                    case R.id.radio_english:
                        prefManager.setLanguage("en");
                        // you need to restart or recreate your activity after locale change
                        break;
                }
            }
        });
    }

}

Please follow this my previous answer to change locale runtime

https://stackoverflow.com/a/52270630/7666442

Upvotes: 1

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