apps-android-commons/app/src/main/java/fr/free/nrw/commons/SettingsActivity.java

package fr.free.nrw.commons;

import android.content.Intent;
import android.content.SharedPreferences;
import android.content.res.Configuration;
import android.os.Bundle;
import android.preference.ListPreference;
import android.preference.Preference;
import android.preference.PreferenceActivity;
import android.preference.PreferenceManager;
import android.support.annotation.LayoutRes;
import android.support.v7.app.AppCompatDelegate;
import android.view.MenuInflater;
import android.view.View;
import android.view.ViewGroup;

public class SettingsActivity extends PreferenceActivity implements SharedPreferences.OnSharedPreferenceChangeListener {
    CommonsApplication app;

    private AppCompatDelegate mDelegate;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        getDelegate().installViewFactory();
        getDelegate().onCreate(savedInstanceState);
        // Check prefs on every activity starts
        if (PreferenceManager.getDefaultSharedPreferences(this).getBoolean("theme",false)) {
            setTheme(R.style.DarkAppTheme);
        }else {
            setTheme(R.style.LightAppTheme); // default
        }
        super.onCreate(savedInstanceState);
        super.onCreate(savedInstanceState);
        addPreferencesFromResource(R.xml.preferences);
        ListPreference licensePreference = (ListPreference) findPreference(Prefs.DEFAULT_LICENSE);
        // WARNING: ORDERING NEEDS TO MATCH FOR THE LICENSE NAMES AND DISPLAY VALUES
        licensePreference.setEntries(new String[]{
                getString(R.string.license_name_cc0),
                getString(R.string.license_name_cc_by),
                getString(R.string.license_name_cc_by_four),
                getString(R.string.license_name_cc_by_sa),
                getString(R.string.license_name_cc_by_sa_four)
        });
        licensePreference.setEntryValues(new String[]{
                Prefs.Licenses.CC0,
                Prefs.Licenses.CC_BY_3,
                Prefs.Licenses.CC_BY_4,
                Prefs.Licenses.CC_BY_SA_3,
                Prefs.Licenses.CC_BY_SA_4
        });

        licensePreference.setSummary(getString(Utils.licenseNameFor(licensePreference.getValue())));
        licensePreference.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
            @Override
            public boolean onPreferenceChange(Preference preference, Object newValue) {
                preference.setSummary(getString(Utils.licenseNameFor((String)newValue)));
                return true;
            }
        });

        app = (CommonsApplication)getApplicationContext();
    }

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

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

    @Override
    public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
        if(key.equals("theme")){
            // Finish current activity and start new one with selected theme
            Intent intent = getIntent();
            finish();
            startActivity(intent);
        }
    }

    // All the stuff below is just to get a actionbar that says settings...

    @Override
    protected void onPostCreate(Bundle savedInstanceState) {
        super.onPostCreate(savedInstanceState);
        getDelegate().onPostCreate(savedInstanceState);
    }

    @Override
    public MenuInflater getMenuInflater() {
        return getDelegate().getMenuInflater();
    }

    @Override
    public void setContentView(@LayoutRes int layoutResID) {
        getDelegate().setContentView(layoutResID);
    }

    @Override
    public void setContentView(View view) {
        getDelegate().setContentView(view);
    }

    @Override
    public void setContentView(View view, ViewGroup.LayoutParams params) {
        getDelegate().setContentView(view, params);
    }

    @Override
    public void addContentView(View view, ViewGroup.LayoutParams params) {
        getDelegate().addContentView(view, params);
    }

    @Override
    protected void onPostResume() {
        super.onPostResume();
        getDelegate().onPostResume();
    }

    @Override
    protected void onTitleChanged(CharSequence title, int color) {
        super.onTitleChanged(title, color);
        getDelegate().setTitle(title);
    }

    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);
        getDelegate().onConfigurationChanged(newConfig);
    }

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

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

    @Override
    public void invalidateOptionsMenu() {
        getDelegate().invalidateOptionsMenu();
    }

    private AppCompatDelegate getDelegate() {
        if (mDelegate == null) {
            mDelegate = AppCompatDelegate.create(this, null);
        }
        return mDelegate;
    }
}