PrefEditor.java

package de.blau.android.prefs;

import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.MenuItem;
import de.blau.android.R;
import de.blau.android.osm.BoundingBox;

/**
 * Simple class for Android's standard-Preference Activity
 * 
 * @author mb
 */
public class PrefEditor extends AppCompatActivity {
	
	final static String CURRENT_VIEWBOX = "VIEWBOX";
	private BoundingBox viewBox = null;
	
	public static void start(@NonNull Context context, BoundingBox viewBox) {
		Intent intent = new Intent(context, PrefEditor.class);
		intent.putExtra(CURRENT_VIEWBOX, viewBox);
		context.startActivity(intent);
	}
	
	@Override
	protected void onCreate(final Bundle savedInstanceState) {
		
		Log.d("PrefEditor", "onCreate");
		Preferences prefs = new Preferences(this);
		if (prefs.lightThemeEnabled()) {
			setTheme(R.style.Theme_AppCompatPrefsLight);
		}
		
		super.onCreate(savedInstanceState);
		
		ActionBar actionbar = getSupportActionBar();
		actionbar.setDisplayHomeAsUpEnabled(true);	

		if (savedInstanceState == null) {
			Log.d("PrefEditor","initializing from intent");
			// No previous state to restore - get the state from the intent
			viewBox = (BoundingBox)getIntent().getSerializableExtra(CURRENT_VIEWBOX);
		} else {
			Log.d("PrefEditor","initializing from saved state");
			// Restore activity from saved state
			viewBox = (BoundingBox) savedInstanceState.getSerializable(CURRENT_VIEWBOX);
		}
		
		PrefEditorFragment f = new PrefEditorFragment();
    	
        Bundle args = new Bundle();
        args.putSerializable(CURRENT_VIEWBOX, viewBox);
        f.setArguments(args);
		
		getSupportFragmentManager().beginTransaction().replace(android.R.id.content,f).commit();	
	}
	
	@Override
	public boolean onOptionsItemSelected(final MenuItem item) {
		Log.d("PrefEditor", "onOptionsItemSelected");
		switch (item.getItemId()) {
		case android.R.id.home:
			finish();
			return true;
		}
		return super.onOptionsItemSelected(item);
	}
	
	@Override
	protected void onSaveInstanceState(final Bundle outState) {
		Log.d("PrefEditor","onSaveInstaceState");
		super.onSaveInstanceState(outState);		
		outState.putSerializable(CURRENT_VIEWBOX, viewBox);
	}
}