我有一个名为ArrayList的{{1}}，它是在应用程序启动时创建的，并通过多种方法填充数据。这个refineList用于自定义List，它根据Adapter数据加载不同的内容。
我有几种方法可以重新排列refineList和refineList内部，但在其中一种情况下，我通过MainActivity开始新的Activity（通过重写方法Intent）和新onRightCardExit()我有一个按钮，用户按下后我想重新排列Activity中的refineList。
我已在我的MainActivity（MainActivity）中创建了该方法，但如何从其他refineListWithSimular()调用该方法，是否有更好的解决方案？我读到了在Utility类中移动这种方法，但我没有弄清楚如何使用它。
以下是我的Activity
MainActivity这是我的另一个名为package com.botevplovdiv.foodmatch2;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
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;
public final static 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);
Log.i(TAG,"Entered onCreate() method in MainActivity");
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();
if (refineList.isEmpty()){
if (checkSwitches()){
showRestartDialog();
}else{
Toast.makeText(MainActivity.this,"The combination of switches turned off, won`t show any results",Toast.LENGTH_SHORT).show();
}
}
//Do something on the left!
//You also have access to the original object.
//If you want to use it just cast it (String) dataObject
}
@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);
Toast toast = Toast.makeText(MainActivity.this,"test",Toast.LENGTH_SHORT);
toast.show();
myAppAdapter.notifyDataSetChanged();
}
});
//floating buttons for remote flipping the cards
FloatingActionButton yesFAB =
(FloatingActionButton) findViewById(R.id.acceptButton);
yesFAB.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (!refineList.isEmpty())
flingContainer.getTopCardListener().selectRight();
}
});
FloatingActionButton noFAB =
(FloatingActionButton) findViewById(R.id.rejectButton);
noFAB.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (!refineList.isEmpty())
flingContainer.getTopCardListener().selectLeft();
}
});
}
@Override
protected void onResume() {
super.onResume();
Log.i(TAG,"Entered onResume() method in MainActivity");
if (refineList.isEmpty()){
if (checkSwitches()){
showRestartDialog();
}else{
Toast.makeText(MainActivity.this,"The combination of switches turned off, will not return any results",Toast.LENGTH_LONG).show();
}
}
}
private void refineDishesList() {
if (this.refineList.size() > 0)
{
this.refineList.clear();
}
for (FoodDish dish : this.dishList){
if (this.searchCriteria.contains(dish.getCategory().toUpperCase()) && this.searchCriteria.contains(dish.getVenueType().toUpperCase())){
this.refineList.add(dish);
}
}
}
private void createSearchCriteria(List<String> searchCriteria){
booleans = new boolean[]{fishSwitch,meatSwitch,vegetarianSwitch,pizzaSwitch,pastaSwitch,restaurantSwitch,takeAwaySwitch};
SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
if (searchCriteria.size() >0){
searchCriteria.clear();
}
for (int i = 0;i < booleansTags.length;i++){
boolean temp = booleans[i];
if (temp){
searchCriteria.add(booleansTags[i]);
}
}
}
private boolean checkSwitches(){
boolean check = true;
if ((!fishSwitch && !meatSwitch && !vegetarianSwitch && !pizzaSwitch && !pastaSwitch) || (!restaurantSwitch && !takeAwaySwitch)){
check = false;
}
return check;
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
Intent preferencesIntent = new Intent(this, Settings.class);
startActivity(preferencesIntent);
return super.onOptionsItemSelected(item);
}
public void loadDishes(){
dishList.add(new FoodDish("Shrimp dish","https://cdn.pixabay.com/photo/2015/04/10/00/41/food-715539_960_720.jpg",getString(R.string.test),"Price : 2,14", "FISH","Restaurant"));
dishList.add(new FoodDish("Pizza ultra mega qkata rabota","http://www.seattleorganicrestaurants.com/vegan-whole-foods/images/Food-Guidelines.jpg","Test description.This a very tasty dish and you should definitely order it.I don`t know what are you waiting for", "Price: 3,87", "PIZZA","Take Away"));
dishList.add(new FoodDish("Pasta","http://assets.simplyrecipes.com/wp-content/uploads/2008/03/pasta-tuna-arugula-horiz-a-1600.jpg",getString(R.string.test), "Price: 4,87","PASTA","Restaurant"));
dishList.add(new FoodDish("Chicken wings","http://cf.yellowblissroad.com/wp-content/uploads/2015/02/Baked-Chicken-Wings.jpg",getString(R.string.test),"Price: 1,23","MEAT","Take Away"));
dishList.add(new FoodDish("Fish","http://cdn.skim.gs/image/upload/v1456339187/msi/grilled-catfish_izglgf.jpg",getString(R.string.test), "Price: 5,87", "FISH","Take Away"));
dishList.add(new FoodDish("Spaghetti","http://food.fnr.sndimg.com/content/dam/images/food/fullset/2009/6/12/2/FO1D41_23785_s4x3.jpg.rend.hgtvcom.616.462.jpeg",getString(R.string.test), "Price: 9,23", "PASTA","Restaurant"));
dishList.add(new FoodDish("Ceasar salad","http://entomofarms.com/wp-content/uploads/2016/04/EF-caesar-salad-cricket-powder.jpg",getString(R.string.test), "Price: 3,45", "VEGETARIAN","Restaurant"));
dishList.add(new FoodDish("Steak sandwich","http://s3.amazonaws.com/finecooking.s3.tauntonclud.com/app/uploads/2017/04/18125307/051120015-01-steak-sandwich-recipe-main.jpg",getString(R.string.test), "Price: 3,45","MEAT","Take Away"));
dishList.add(new FoodDish("Lasagna","http://www.weightlossresources.co.uk/img/recipes/vegetarian-dishes.jpg",getString(R.string.test), "Price: 11,45","VEGETERIAN","Restaurant"));
dishList.add(new FoodDish("Sea Food Risotto","http://www.dvo.com/recipe_pages/healthy/Lemony_Seafood_Risotto.jpg",getString(R.string.test), "Price: 8,45","VEGETERIAN","Take Away"));
}
public void refreshContent(){
createSearchCriteria(searchCriteria);
refineDishesList();
flingContainer.removeAllViewsInLayout();
myAppAdapter.notifyDataSetChanged();
preferenceChanged = true;
}
public void refineListWithSimilar(String simularCategory){
if (this.refineList.size()>0){
for (FoodDish dish : this.refineList){
if (dish.getCategory().toUpperCase().equals(simularCategory.toUpperCase())){
this.refineList.add(0,dish);
}else{
this.refineList.add(dish);
}
}
}
flingContainer.removeAllViewsInLayout();
myAppAdapter.notifyDataSetChanged();
}
public void showRestartDialog(){
new AlertDialog.Builder(MainActivity.this)
.setTitle("Restart list?")
.setMessage("Do you want to restart the list?")
.setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
createSearchCriteria(searchCriteria);
refineDishesList();
myAppAdapter.notifyDataSetChanged();
}
})
.setNegativeButton(android.R.string.no, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// do nothing
}
})
.setIcon(android.R.drawable.ic_dialog_alert)
.show();
}
private SharedPreferences.OnSharedPreferenceChangeListener preferencesChangeListener =
new SharedPreferences.OnSharedPreferenceChangeListener() {
@Override
public void onSharedPreferenceChanged(
SharedPreferences sharedPreferences, String key) {
switch (key){
case FISH:
fishSwitch = sharedPreferences.getBoolean(FISH,false);
refreshContent();
break;
case MEAT:
meatSwitch = sharedPreferences.getBoolean(MEAT,false);
refreshContent();
break;
case VEGETARIAN:
vegetarianSwitch = sharedPreferences.getBoolean(VEGETARIAN,false);
refreshContent();
break;
case PIZZA:
pizzaSwitch = sharedPreferences.getBoolean(PIZZA,false);
refreshContent();
break;
case PASTA:
pastaSwitch = sharedPreferences.getBoolean(PASTA,false);
refreshContent();
break;
case RESTAURANTS:
restaurantSwitch = sharedPreferences.getBoolean(RESTAURANTS,false);
refreshContent();
break;
case TAKEAWAY:
takeAwaySwitch = sharedPreferences.getBoolean(TAKEAWAY,false);
refreshContent();
break;
} //end of switch statement
}
};
}
的{{1}}。基本上，我想在单击Activity按钮时调用方法来重新排列LikedProduct中的refineList。
viewSimular提前感谢您的帮助。
更新
我看到我的问题被标记为重复，但另一个问题与我的问题没有任何共同之处。我问我如何在返回之前重新安排MainActivity中package com.botevplovdiv.foodmatch2;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import com.bumptech.glide.Glide;
import com.bumptech.glide.load.engine.DiskCacheStrategy;
import com.bumptech.glide.request.animation.GlideAnimation;
import com.bumptech.glide.request.target.SimpleTarget;
import com.bumptech.glide.request.target.Target;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
public class LikedProduct extends AppCompatActivity {
Button smallBackButton;
Button viewSimilar;
String TAG = "FoodMatch";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_liked_product);
final FoodDish current = getIntent().getExtras().getParcelable("current");
Glide
.with(getApplicationContext())
.load(current.getImagePath())
.asBitmap()
.diskCacheStrategy(DiskCacheStrategy.SOURCE)
.into(new SimpleTarget<Bitmap>(Target.SIZE_ORIGINAL,Target.SIZE_ORIGINAL) {
@Override
public void onResourceReady(Bitmap resource, GlideAnimation glideAnimation) {
ImageView image = (ImageView) findViewById(R.id.likedImagePic);
image.setImageBitmap(resource);
}
});
viewSimilar = (Button) findViewById(R.id.view_similar);
viewSimilar.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String similarCategory = current.getCategory();
//Here I want to use the method to rearrange the refineList and then go back to MainActivity
onBackPressed();
}
});
smallBackButton = (Button) findViewById(R.id.smallBackButton);
smallBackButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
onBackPressed();
}
});
}
@Override
protected void onStart() {
super.onStart();
Log.i(TAG,"Entered onStart() method in LikedProduct");
}
}
来自另一项活动。
我设法使用ArrayList找到了一些解决方案，但我问的是如何访问MainActivity中的列表或方法，因为我想在重新排列列表之前重新排列它。根据我的阅读，其中一个选项是制作方法startActivityForResult，但我也必须制作MainActivity static。这是一个很好的做法，有没有做到这一点的缺陷？
答案 0 :(得分：-1)
您可以使用Application类将其存档，如下所示：
public class MyApplication extends Application{
private List<YourObject> refineList;
}
然后您可以随时随地修改refineList：((MyApplication)getApplication()).getRefineList();