I am new to android and I have to create an android app for my final project.
I am making a swipe card app and I am using 'com.lorentzos.swipecards:library:1.0.9' library for the swiping engine.
It uses a custom adapter that extends a base adapter to inflate a layout file and populate certain ImageViews and TextViews with iformation coming from an ArrayList.
This is the code of the adapter
package com.botevplovdiv.foodmatch2;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.TextView;
import com.bumptech.glide.Glide;
import com.bumptech.glide.load.engine.DiskCacheStrategy;
import java.util.ArrayList;
import java.util.List;
/**
* Created by Stelio on 13.5.2017 г..
*/
public class MyAppAdapter extends BaseAdapter {
private static class ViewHolder {
public FrameLayout background;
public TextView DataText;
public ImageView cardImage;
public TextView shortDescriptionTextView;
public TextView title;
}
;
public List<FoodDish> dishesList = new ArrayList<>();
public Context mContext;
public MyAppAdapter(Context context, List<FoodDish> foodDishes) {
this.dishesList = foodDishes;
this.mContext = context;
}
@Override
public int getCount() {
return dishesList.size();
}
@Override
public Object getItem(int position) {
return position;
}
@Override
public long getItemId(int position) {
return position;
}
public List<FoodDish> getDishesList(){
return this.dishesList;
}
public void updateReceiptsList(List<FoodDish> newlist) {
dishesList.clear();
dishesList.addAll(newlist);
this.notifyDataSetChanged();
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
FoodDish current = dishesList.get(position);
ViewHolder viewHolder;
if (convertView == null) {
LayoutInflater inflater = LayoutInflater.from(mContext);
convertView = inflater.inflate(R.layout.cards_layout, parent,false);
// configure view holder
viewHolder = new ViewHolder();
viewHolder.DataText = (TextView) convertView.findViewById(R.id.priceText);
viewHolder.background = (FrameLayout) convertView.findViewById(R.id.background);
viewHolder.cardImage = (ImageView) convertView.findViewById(R.id.cardImage);
viewHolder.shortDescriptionTextView = (TextView) convertView.findViewById(R.id.shortDescription);
viewHolder.title = (TextView) convertView.findViewById(R.id.titleText);
convertView.setTag(viewHolder);
} else {
viewHolder = (ViewHolder) convertView.getTag();
}
viewHolder.DataText.setText(current.getPrice());
viewHolder.title.setText(current.getTitle());
viewHolder.shortDescriptionTextView.setText(current.getDescription());
Glide.with(mContext).load(current.getImagePath()).into(viewHolder.cardImage);
return convertView;
}
}
Everything is going fine till one point.
I have a Settings activity, which inflates a preferences.xml which has a bunch of switches. I could do it using MultiSelectListPreferences, but I want to be with switches for aesthetic reasons.
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
<PreferenceCategory
android:selectable="true"
android:title="@string/food_categories_name">
<SwitchPreference
android:defaultValue="true"
android:key="fishSwitch"
android:title="Fish" />
<SwitchPreference
android:defaultValue="true"
android:key="meatSwitch"
android:title="Meat" />
<SwitchPreference
android:defaultValue="true"
android:key="vegSwitch"
android:title="Vegeterian" />
<SwitchPreference
android:defaultValue="true"
android:key="pizzaSwitch"
android:title="Pizza" />
<SwitchPreference
android:defaultValue="true"
android:key="pastaSwitch"
android:title="Pasta" />
</PreferenceCategory>
<ListPreference
android:defaultValue="@array/area_list"
android:entries="@array/area_list"
android:entryValues="@array/area_list"
android:key="list_preference_1"
android:title="@string/areas" />
<PreferenceCategory android:title="@string/venues_categories">
<SwitchPreference
android:defaultValue="true"
android:key="restaurantSwitch"
android:title="Restaurants" />
<SwitchPreference
android:defaultValue="true"
android:key="takeAwaySwitch"
android:title="Take Away" />
</PreferenceCategory>
In my MainActivity I have prefereceChangedListner which register changes and refine the searcCriteria and refineList Lists throught the respectful methods.
package com.botevplovdiv.foodmatch2;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.pm.ActivityInfo;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.preference.PreferenceFragment;
import android.preference.PreferenceManager;
import android.preference.SwitchPreference;
import android.support.design.widget.FloatingActionButton;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.Toast;
import com.bumptech.glide.Glide;
import com.lorentzos.flingswipe.SwipeFlingAdapterView;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
public class MainActivity extends AppCompatActivity {
// keys for reading data from SharedPreferences
public static final String FISH = "fishSwitch";
public static final String MEAT = "meatSwitch";
public static final String VEGETARIAN = "vegSwitch";
public static final String PIZZA = "pizzaSwitch";
public static final String PASTA = "pastaSwitch";
public static final String RESTAURANTS = "restaurantSwitch";
public static final String TAKEAWAY = "takeAwaySwitch";
private MyAppAdapter myAppAdapter;
private List<FoodDish> dishList;
private List<FoodDish> refineList;
private List<FoodDish> dumpList;
private List<Venue> venues;
private boolean[] booleans;
private String[] booleansTags;
private List<String> searchCriteria;
private SwipeFlingAdapterView flingContainer;
public static Map<String, Bitmap> bitmaps = new HashMap<>();
boolean fishSwitch;
boolean meatSwitch;
boolean vegetarianSwitch;
boolean pizzaSwitch;
boolean pastaSwitch;
boolean restaurantSwitch;
boolean takeAwaySwitch;
boolean preferenceChanged = true;
String TAG = "FoodMatch";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
flingContainer = (SwipeFlingAdapterView) findViewById(R.id.frame);
// set default values in the app's SharedPreferences
PreferenceManager.setDefaultValues(this, R.xml.preferences, false);
// register listener for SharedPreferences changes
SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
sharedPreferences.registerOnSharedPreferenceChangeListener(
preferencesChangeListener);
fishSwitch = sharedPreferences.getBoolean(FISH,false);
meatSwitch = sharedPreferences.getBoolean(MEAT,false);
vegetarianSwitch = sharedPreferences.getBoolean(VEGETARIAN,false);
pizzaSwitch = sharedPreferences.getBoolean(PIZZA,false);
pastaSwitch = sharedPreferences.getBoolean(PASTA,false);
restaurantSwitch = sharedPreferences.getBoolean(RESTAURANTS,false);
takeAwaySwitch = sharedPreferences.getBoolean(TAKEAWAY,false);
booleansTags = new String[] {"FISH","MEAT","VEGETARIAN","PIZZA","PASTA","RESTAURANT","TAKE AWAY"};
dishList = new ArrayList<>();
searchCriteria = new ArrayList<>();
refineList = new ArrayList<>();
dumpList = new ArrayList<>();
// load initial data
loadDishes();
createSearchCriteria(searchCriteria);
refineDishesList();
//lock the device to portrait mode
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
myAppAdapter = new MyAppAdapter(this, refineList);
flingContainer.setAdapter(myAppAdapter);
flingContainer.setFlingListener(new SwipeFlingAdapterView.onFlingListener() {
@Override
public void removeFirstObjectInAdapter()
{
}
@Override
public void onLeftCardExit(Object dataObject)
{
FoodDish current = refineList.get(0);
refineList.remove(0);
myAppAdapter.notifyDataSetChanged();
}
}
@Override
public void onRightCardExit(Object dataObject)
{
FoodDish current = refineList.get(0);
Intent intent = new Intent(MainActivity.this,LikedProduct.class).putExtra("current",current);
startActivity(intent);
refineList.remove(0);
myAppAdapter.notifyDataSetChanged();
}
@Override
public void onAdapterAboutToEmpty(int itemsInAdapter)
{
}
@Override
public void onScroll(float scrollProgressPercent) {
View view = flingContainer.getSelectedView();
view.findViewById(R.id.background).setAlpha(0);
view.findViewById(R.id.item_swipe_left_indicator).setAlpha(scrollProgressPercent < 0 ? -scrollProgressPercent : 0);
view.findViewById(R.id.item_swipe_right_indicator).setAlpha(scrollProgressPercent > 0 ? scrollProgressPercent : 0);
}
});
// Listener for touching events
flingContainer.setOnItemClickListener(new SwipeFlingAdapterView.OnItemClickListener()
{
@Override
public void onItemClicked(int itemPosition, Object dataObject) {
View view = flingContainer.getSelectedView();
view.findViewById(R.id.background).setAlpha(0);
myAppAdapter.notifyDataSetChanged();
}
});
//floating buttons for remote flipping the cards
FloatingActionButton yesFAB =
(FloatingActionButton) findViewById(R.id.acceptButton);
yesFAB.setOnClickListener(new View.OnClickListener() {
@Override
public void onC
