My Activity is called, so the User should select some Songs, he want to add to a Playlist. How do I make a RecyclerView selectable (the Background-Color should be an Accent Color) and how do I receive the List or Array of the selected Songs from my RecyclerView?
My SelectSongsActivity:
public class SelectSongsActivity extends AppCompatActivity {
private Song[] sSongs;
private RecyclerView recyclerView;
private RecyclerView.LayoutManager layoutManager;
private SelectSongRecyclerViewAdapter adapter;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Bundle bundle = getIntent().getExtras();
sSongs = (Song[]) bundle.get(Constants.IntentExtra.SONGS);
Initialize();
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_selectsongs, menu);
return super.onCreateOptionsMenu(menu);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
if (item.getItemId() == R.id.mi_Add) {
Intent i = getIntent();
i.putExtra(Constants.IntentExtra.SONGS, adapter.getSelectedSongs());
setResult(RESULT_OK, i);
finish();
}
return super.onOptionsItemSelected(item);
}
#Override
public void onBackPressed() {
setResult(RESULT_CANCELED);
super.onBackPressed();
}
#Override
public boolean onSupportNavigateUp() {
setResult(RESULT_CANCELED);
return super.onSupportNavigateUp();
}
private void Initialize() {
setContentView(R.layout.activity_selectsongs);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
recyclerView.addItemDecoration(new RecyclerViewDivider(this));
layoutManager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(layoutManager);
adapter = new SelectSongRecyclerViewAdapter(sSongs);
recyclerView.setAdapter(adapter);
}
}
And my RecyclerViewAdapter:
public class SelectSongRecyclerViewAdapter extends RecyclerView.Adapter<SelectSongRecyclerViewAdapter.Holder> {
private Song[] sSongs;
private List<Song> selectedSongs;
public SelectSongRecyclerViewAdapter(Song[] songs) {
sSongs = songs;
selectedSongs = new ArrayList<>();
}
#Override
public Holder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.adapter_songview, parent, false);
Holder holder = new Holder(view);
return holder;
}
#Override
public void onBindViewHolder(Holder holder, int position) {
//holder.imvSong.setImageResource(R.drawable.standardartwork);
holder.txvSongTitle.setText(sSongs[position].getTitle());
holder.txvSongInfo.setText(sSongs[position].getArtists());
}
#Override
public int getItemCount() {
return sSongs != null ? sSongs.length : 0;
}
public Song[] getSelectedSongs() {
Song[] songs = new Song[selectedSongs.size()];
return selectedSongs.toArray(songs);
}
public class Holder extends RecyclerView.ViewHolder {
LinearLayout linearLayout;
ImageView imvSong;
TextView txvSongTitle;
TextView txvSongInfo;
public Holder(View layout) {
super(layout);
linearLayout = (LinearLayout) layout;
imvSong = (ImageView) layout.findViewById(R.id.imvSong);
txvSongTitle = (TextView) layout.findViewById(R.id.adap_txvSongtitle);
txvSongInfo = (TextView) layout.findViewById(R.id.txvSongInfo);
}
}
}
Thanks!
You mean when you click on the linearlayout?
What you can do is in the onbindviewholder-
holder.linearlayout.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
selectedSongs.add(sSongs[position]);
}
});
To display already selected songs in a different color-
if (selectedSongs.contains(sSongs[position])) {
holder.linearlayout.setBackgroundColor(R.color.color_accent);
} else {
//else as viewholders are reused
holder.linearlayout.setBackgroundColor(R.color.default_color);
}
Related
>>>>>>>MAIN ACTIVITY XML<<<<<<<
As you can see the TextView is on the top, that's where I want to display the title of selected RecyclerView item. Most of the tutorials and blog teach to navigate to next activity when an item is clicked, but that isn't something I am looking for.
MainActivity.java
public class MainActivity extends AppCompatActivity implements ItemAdapterCallback {
private RecyclerView recyclerView;
private List<Item> itemList;
private ItemAdapter itemAdapter;
private SearchView searchView;
TextView itemname;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initialize(savedInstanceState);
initializeLogic();
}
private void initialize(Bundle savedInstanceState) {
recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
searchView = (SearchView) findViewById(R.id.searchView);
searchView.clearFocus();
searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
#Override
public boolean onQueryTextSubmit(String query) {
return false;
}
#Override
public boolean onQueryTextChange(String newText) {
filterList(newText);
return true;
}
});
}
private void filterList(String newText) {
List<Item> filteredList = new ArrayList<>();
for (Item item : itemList) {
if (item.getItemName().toLowerCase().contains(newText.toLowerCase())){
filteredList.add(item);
}
}
if (filteredList.isEmpty()) {
Toast.makeText(this, "No Match", Toast.LENGTH_SHORT).show();
} else {
itemAdapter.setFilteredList(filteredList);
}
}
private void initializeLogic() {
RecyclerView();
}
private void RecyclerView () {
itemList = new ArrayList<>();
// Adding Data to Item List
itemList.add(new Item("Black", R.drawable.android_black));
itemList.add(new Item("Blue", R.drawable.android_blue));
itemList.add(new Item("Green", R.drawable.android_green));
itemList.add(new Item("Pink", R.drawable.android_pink));
itemList.add(new Item("Red", R.drawable.android_red));
itemList.add(new Item("Yellow", R.drawable.android_yellow));
itemList.add(new Item("Black", R.drawable.android_black));
itemList.add(new Item("Blue", R.drawable.android_blue));
itemList.add(new Item("Green", R.drawable.android_green));
itemList.add(new Item("Pink", R.drawable.android_pink));
itemList.add(new Item("Red", R.drawable.android_red));
itemList.add(new Item("Yellow", R.drawable.android_yellow));
itemAdapter = new ItemAdapter(itemList, this);
recyclerView.setAdapter(itemAdapter);
}
#Override
public void onItemClicker() {
//????????????????
}
}
Item.java
public class Item {
private String itemName;
private int itemImage;
public Item(String itemName, int itemImage) {
this.itemImage = itemImage;
this.itemName = itemName;
}
public int getItemImage() {
return itemImage;
}
public String getItemName() {
return itemName;
}
public void setItemName(String itemName) {
this.itemName = itemName;
}
}
ItemAdapter.java
public class ItemAdapter extends RecyclerView.Adapter<ItemAdapter.ItemViewHolder> {
private List<Item> itemList;
int row_index = -1;
private ItemAdapterCallback callback;
public ItemAdapter(List<Item> itemList, ItemAdapterCallback callback) {
this.itemList = itemList;
this.callback = callback;
}
public void setFilteredList(List<Item> filteredList) {
this.itemList = filteredList;
notifyDataSetChanged();
}
#NonNull
#Override
public ItemViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.each_item, parent, false );
return new ItemViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull ItemViewHolder holder, int position) {
Item item = itemList.get(position);
holder.itemNameTv.setText(item.getItemName());
holder.itemImageView.setImageResource(item.getItemImage());
holder.itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
////////////////////////////
//Toast.makeText(view.getContext(), "Item is clicked" + item.getItemName(), Toast.LENGTH_SHORT).show();
}
});
holder.cardView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
row_index = position;
notifyDataSetChanged();
Toast.makeText(v.getContext(), "Item is clicked " + position + " " + item.getItemName(), Toast.LENGTH_SHORT).show();
callback.onItemClicker();
}
});
if (row_index == position) {
holder.cardView.setBackgroundColor(Color.LTGRAY);
} else {
holder.cardView.setBackgroundColor(Color.WHITE);
}
}
#Override
public int getItemCount() {
if (itemList == null) {
return 0;
} else {
return itemList.size();
}
}
public class ItemViewHolder extends RecyclerView.ViewHolder{
public TextView itemNameTv;
public ImageView itemImageView;
public CardView cardView;
public ItemViewHolder(#NonNull View itemView) {
super(itemView);
cardView = itemView.findViewById(R.id.eachCardView);
itemNameTv = itemView.findViewById(R.id.eachItemTextView);
itemImageView = itemView.findViewById(R.id.eachItemImageView);
}
}
}
ItemAdapterCallback (Interface)
public interface ItemAdapterCallback {
void onItemClicker();
}
You are just missing few things here.
1- if you want to get the title from the adapter you will need to pass the title in your Callback Interface
public interface ItemAdapterCallback {
void onItemClicker(String title);}
2- after this change you will override the onItemClickerCallback in your mainActivity
it will look like this
#Override
public void onItemClicker(String title) {
// your title ,
itemname.setText(title);
}
3- in onClick function of the adapter add this line
holder.itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if(callback!=null){
callback.onItemClicker( item.getItemName());
}
}
});
that's all you need to do to show the title in your mainActivity from adapter.
I have 2 recycler views that have cards.They basically look the same have the same number of cards and everthing. The first one is for like viewing and other stuff and the second one is only for deleting cards. OnlongClicking a card in the first recycler view triggers the opening of the second recycler view. I wanted to add transitions in between them like what keep notes has done when a card is long clicked. Both the recycler view use the same adapter. I have set what the adapter should do based on passing context to the adapter. enter image description here this is my 1st layout having the 1st recycler view.enter image description here this is the 2nd layout having the second recycler view.I want like a seamless transition for the tool bar again just like what Google keeps has done.A simple solution would be preferred as I am very new to this stuff.
Here is the java code for the adapter.
public class Task_recycle_view_adapter extends RecyclerView.Adapter<Task_recycle_view_adapter.ViewHolder>{
private List<struct_task> task_list= new ArrayList<>();
private ArrayList<String> isSelected=new ArrayList<String>();
protected Context context1;
protected Context context2;
private String labelName;
private String taskName;
private ConstraintLayout label_menu_avatar;
public Task_recycle_view_adapter(Context context1,Context context2)
{
this.context1=context1;
this.context2=context2;
}
#NonNull
#Override
public ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {//parent is the parent of the recycle view it is taken as an arg to use it to attach the every view to the parent view
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.activity_task,parent,false);//to inflate a layout
ViewHolder holder= new ViewHolder(view);
return holder;
}
#RequiresApi(api = Build.VERSION_CODES.O)
#Override
public void onBindViewHolder(#NonNull ViewHolder holder, int position) {
holder.taskname.setText(task_list.get(position).getTask_name());
holder.taskid.setText(String.valueOf(task_list.get(position).getTask_id()));
if(context2==null && context1!=null) {
String taskName=task_list.get(position).getTask_name();
Long taskid=task_list.get(position).getTask_id();
String duedate=task_list.get(position).getDue_date();
holder.parent.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
DataBaseHelper dataBaseHelper = new DataBaseHelper(context1);
ArrayList<SubTaskModel> subtask_list=(ArrayList<SubTaskModel>) dataBaseHelper.getAllSubTasksFor(labelName, Long.parseLong(holder.taskid.getText().toString()));
Intent intent1 =new Intent(context1,ViewTaskActivity.class);
intent1.putExtra("label_name",labelName);
intent1.putExtra("task_id",taskid);
intent1.putExtra("task_name",taskName);
intent1.putExtra("due_date",duedate);
intent1.putParcelableArrayListExtra("subtask_list", (ArrayList<? extends Parcelable>) subtask_list);
context1.startActivity(intent1);
}
});
holder.parent.setOnLongClickListener(new View.OnLongClickListener() {
#Override
public boolean onLongClick(View v) {
Intent intent2 = new Intent(context1, Delete_page_Activity.class);
intent2.putParcelableArrayListExtra("task_list", (ArrayList<? extends Parcelable>) task_list);
intent2.putExtra("label_name",labelName);
intent2.putExtra("selected_task",taskName);
Pair[] pairs = new Pair[1];
pairs[0]= new Pair<View,String>(label_menu_avatar,"transition1");
ActivityOptions options= ActivityOptions.makeSceneTransitionAnimation((Activity) context1,pairs);
context1.startActivity(intent2,options.toBundle());
return true;
}
});
}
if(context2!=null && context1==null)
{
if(taskName.equals(task_list.get(position).getTask_name()))
{
holder.active=1;
isSelected.add(holder.taskid.getText().toString());
holder.parent.findViewById(R.id.layout_for_every_task).setBackgroundResource(R.drawable.background_for_task_card);
}
holder.parent.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if(holder.active==0) {
isSelected.add(holder.taskid.getText().toString());
v.findViewById(R.id.layout_for_every_task).setBackgroundResource(R.drawable.background_for_task_card);
holder.active=1;
}
else {
isSelected.remove(holder.taskid.getText().toString());
v.findViewById(R.id.layout_for_every_task).setBackgroundResource(R.drawable.background_for_task_card_transparent);
holder.active=0;
}
}
});
}
// subtasks 1 to 5
if(task_list.get(position).getSubtask1()!=null)
holder.subtask1.setText(task_list.get(position).getSubtask1());
else
holder.subtask1.setVisibility(View.GONE);
if(task_list.get(position).getSubtask2()!=null)
holder.subtask2.setText(task_list.get(position).getSubtask2());
else
holder.subtask2.setVisibility(View.GONE);
if(task_list.get(position).getSubtask3()!=null)
holder.subtask3.setText(task_list.get(position).getSubtask3());
else
holder.subtask3.setVisibility(View.GONE);
if(task_list.get(position).getSubtask4()!=null)
holder.subtask4.setText(task_list.get(position).getSubtask4());
else
holder.subtask4.setVisibility(View.GONE);
if(task_list.get(position).getSubtask5()!=null)
holder.subtask5.setText(task_list.get(position).getSubtask5());
else
holder.subtask5.setVisibility(View.GONE);
// due date
if(task_list.get(position).getDue_date()!=null)
holder.duedate.setText(task_list.get(position).getDue_date());
else
holder.duedate.setVisibility(View.GONE);
// progress
holder.progresscircle.setProgress(task_list.get(position).getProgress());
}
#Override
public int getItemCount() {
return task_list.size();
}
public void setTask_list(List<struct_task> task_list) {
this.task_list = task_list;//to refresh the data inside the recycler view
}
#Override
public int getItemViewType(int position) {
return position;
}
public String getLabelName() {
return labelName;
}
public void setLabelName(String labelName) {
this.labelName = labelName;
}
public ArrayList<String> getIsSelected() {
return isSelected;
}
public String getTaskName() {
return taskName;
}
public void setTaskName(String taskName) {
this.taskName = taskName;
}
public void setLabel_menu_avatar(ConstraintLayout label_menu_avatar) {
this.label_menu_avatar = label_menu_avatar;
}
public static class ViewHolder extends RecyclerView.ViewHolder{// holds the view for every item inside the recycle view
private TextView taskname,taskid,duedate,subtask1,subtask2,subtask3,subtask4,subtask5;
private CardView parent;
private ProgressBar progresscircle;
public void setActive(int active) {
this.active = active;
}
private int active;
public ViewHolder(#NonNull View itemView) {
super(itemView);
taskid=itemView.findViewById(R.id.task_id);
taskname = itemView.findViewById(R.id.task_name);
parent = itemView.findViewById(R.id.card_for_every_task);
duedate = itemView.findViewById(R.id.due_date);
progresscircle = itemView.findViewById(R.id.progress_circular);
subtask1 = itemView.findViewById(R.id.subtask_1);
subtask2 = itemView.findViewById(R.id.subtask_2);
subtask3 = itemView.findViewById(R.id.subtask_3);
subtask4 = itemView.findViewById(R.id.subtask_4);
subtask5 = itemView.findViewById(R.id.subtask_5);
active=0;
}
}
}
Here is the code for the 1st activity i.e the 1st image:
public class TaskPageActivity extends AppCompatActivity {
private RecyclerView task_rv;//task recycler view
private FloatingActionButton addTask;
private long tasksNum;
private String labelName;
private DataBaseHelper dataBaseHelper = new DataBaseHelper(this);
private Task_recycle_view_adapter adapter= new Task_recycle_view_adapter(this,null);
private List<struct_task> tasks;
private EditText searchBar;
private ConstraintLayout search_btn;
private ConstraintLayout calendar_btn;
#RequiresApi(api = Build.VERSION_CODES.O)
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_task_title);
getWindow().getSharedElementExitTransition();
InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
search_btn= findViewById(R.id.search_btn);
calendar_btn=findViewById(R.id.calendar_btn);
search_btn.setClickable(true);
search_btn.setFocusable(true);
labelName = getIntent().getExtras().getString("832715");
TextView txtLabelName = findViewById(R.id.Label_name);
txtLabelName.setText(labelName);
task_rv = findViewById(R.id.Recycle_view_task);
addTask = findViewById(R.id.add_task);
searchBar= (SearchBar) findViewById(R.id.search_bar);
tasksNum = getTasksNum(labelName, dataBaseHelper, adapter); //displays all tasks and return number of tasks
ConstraintLayout.LayoutParams params= (ConstraintLayout.LayoutParams) searchBar.getLayoutParams();
addTask.setOnClickListener(view -> {
tasksNum = getTasksNum(labelName, dataBaseHelper, adapter);
Intent intent = new Intent(TaskPageActivity.this, AddTaskPageActivity.class);
intent.putExtra("labelName", labelName);
intent.putExtra("taskID", tasksNum);
startActivity(intent);
});
search_btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if(searchBar.getVisibility()==View.INVISIBLE) {
search_btn.setAlpha(.5f);
searchBar.setVisibility(View.VISIBLE);
searchBar.requestFocus();
imm.showSoftInput(searchBar,InputMethodManager.SHOW_IMPLICIT);
ConstraintLayout.LayoutParams params= (ConstraintLayout.LayoutParams) searchBar.getLayoutParams();
params.verticalBias = .55f;
searchBar.setLayoutParams(params);
searchBar.requestFocus();
}
else {
searchBar.setVisibility(View.INVISIBLE);
search_btn.setAlpha(1.0f);
}
}
});
searchBar.setOnFocusChangeListener(new View.OnFocusChangeListener() {
#Override
public void onFocusChange(View v, boolean hasFocus) {
if(hasFocus) {
ConstraintLayout.LayoutParams params = (ConstraintLayout.LayoutParams) searchBar.getLayoutParams();
if(params.verticalBias==.9f) {
searchBar.requestFocus();
params.verticalBias = .55f;
searchBar.setLayoutParams(params);
}
searchBar.setOnKeyListener(new View.OnKeyListener() {
#Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
if((event.getAction()==KeyEvent.ACTION_DOWN) && (keyCode==KeyEvent.KEYCODE_ENTER) && params.verticalBias==.55f)
{
ConstraintLayout.LayoutParams params = (ConstraintLayout.LayoutParams) searchBar.getLayoutParams();
searchBar.requestFocus();
params.verticalBias = .9f;
searchBar.setLayoutParams(params);
searchBar.clearFocus();
imm.hideSoftInputFromWindow(searchBar.getWindowToken(),0);
}
return false;
}
});
}
}
});
searchBar.addTextChangedListener(new TextWatcher() {
#Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
#Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
#Override
public void afterTextChanged(Editable s) {
filter(s.toString());
}
});
AlertDialog alertDialog = new AlertDialog.Builder(TaskPageActivity.this).create();
calendar_btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if(calendar_btn.getAlpha()==1.0f) {
calendar_btn.setAlpha(.5f);
LayoutInflater inflater = getLayoutInflater();
View view1 = inflater.inflate(R.layout.dialog_calendar,null);
alertDialog.getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
alertDialog.setView(view1);
CalendarView mCalendarView= view1.findViewById(R.id.calendar);
mCalendarView.setMinDate(Calendar.getInstance().getTimeInMillis());
alertDialog.show();
}
}
});
alertDialog.setOnDismissListener(new DialogInterface.OnDismissListener() {
#Override
public void onDismiss(DialogInterface dialog) {
if(calendar_btn.getAlpha()==.5f)
calendar_btn.setAlpha(1.0f);
}
});
}
private void filter(String string) {
ArrayList<struct_task> filteredList = new ArrayList<>();
for(struct_task item: tasks)
{
if(item.getTask_name().contains(string) || item.getTask_name().contains(string.toUpperCase()))
{
filteredList.add(item);
}
}
if(filteredList.size()!=0) {
adapter.setTask_list(filteredList);
task_rv.setAdapter(adapter);
}
}
#Override
public void onBackPressed() {
if(searchBar.getText().toString().length()!=0) {
showAllTasks(labelName, dataBaseHelper, adapter);
searchBar.setText(null);
searchBar.setVisibility(View.INVISIBLE);
search_btn.setAlpha(1.0f);
}
else if(searchBar.getText().toString().length()==0)
{
super.onBackPressed();
}
}
#Override
protected void onResume() {
ConstraintLayout.LayoutParams params = (ConstraintLayout.LayoutParams) searchBar.getLayoutParams();
showAllTasks(labelName, dataBaseHelper, adapter);
if(params.verticalBias==.54f) {
searchBar.requestFocus();
params.verticalBias = .9f;
searchBar.setLayoutParams(params);
searchBar.clearFocus();
}
if(searchBar.getText().toString().length()==0) {
showAllTasks(labelName, dataBaseHelper, adapter);
}
else {
filter(searchBar.getText().toString());
}
super.onResume();
}
private void showAllTasks(String labelName, DataBaseHelper dataBaseHelper, Task_recycle_view_adapter adapter) {
tasks = dataBaseHelper.getAllTasksFor(labelName);
adapter.setLabelName(labelName);
adapter.setTask_list(tasks);
task_rv.setAdapter(adapter);
task_rv.setLayoutManager(new StaggeredGridLayoutManager(2,StaggeredGridLayoutManager.VERTICAL));
}
long getTasksNum(String labelName, DataBaseHelper dataBaseHelper, Task_recycle_view_adapter adapter) {
return dataBaseHelper.getLastTaskID(labelName)+1; //to determine ID of next task
}
#Override
protected void onUserLeaveHint() {
ConstraintLayout.LayoutParams params = (ConstraintLayout.LayoutParams) searchBar.getLayoutParams();
params.verticalBias=.9f;
searchBar.setLayoutParams(params);
searchBar.setText(null);
searchBar.clearFocus();
super.onUserLeaveHint();
}
}
And finally for the 2nd activity which is triggered by longclicking any card
public class Delete_page_Activity extends AppCompatActivity {
private Task_recycle_view_adapter recycle_view_adapter = new Task_recycle_view_adapter(null,this);
private ArrayList<String> delete_list=new ArrayList<>();
private DataBaseHelper dataBaseHelper = new DataBaseHelper(this);
private String labelName=null;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_delete_page);
overridePendingTransition(0,0);
Toolbar toolbar=findViewById(R.id.toolbar_bar);
ImageView close_btn=findViewById(R.id.close_btn);
setSupportActionBar(toolbar);
getSupportActionBar().setTitle(null);
ArrayList<struct_task> task_list = getIntent().getParcelableArrayListExtra("task_list");
labelName=getIntent().getExtras().getString("label_name");
String task = getIntent().getExtras().getString("selected_task");
Log.e("test",labelName);
RecyclerView recyclerView = findViewById(R.id.delete_Recycler_View);
recycle_view_adapter.setTaskName(task);
recycle_view_adapter.setTask_list(task_list);
recyclerView.setAdapter(recycle_view_adapter);
recyclerView.setLayoutManager(new StaggeredGridLayoutManager(2,StaggeredGridLayoutManager.VERTICAL));
close_btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
finish();
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.toolbar_menu,menu);
return true;
}
#Override
public boolean onOptionsItemSelected(#NonNull MenuItem item) {
switch (item.getItemId())
{
case R.id.tool_bar_item1:
delete_list = recycle_view_adapter.getIsSelected();
if(delete_list.size()==0)
{
Toast toast1= new Toast(this);
toast1.setDuration(Toast.LENGTH_SHORT);
LayoutInflater inflater= (LayoutInflater) this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View view= inflater.inflate(R.layout.activity_toast_msg1,null);
view.setBackgroundResource(R.drawable.background_for_calendar);
toast1.setView(view);
toast1.show();
}
else {
for (int task = 0; task < delete_list.size(); task++) {
dataBaseHelper.deleteOneTask(labelName, Long.parseLong(delete_list.get(task)));
}
finish();
}
break;
case R.id.tool_bar_item2:
Boolean flag=dataBaseHelper.deleteAllCompletedTasks(labelName);
if(flag)
finish();
else
{
Toast toast2= new Toast(this);
toast2.setDuration(Toast.LENGTH_SHORT);
LayoutInflater inflater= (LayoutInflater) this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View view= inflater.inflate(R.layout.activity_toast_msg2,null);
view.setBackgroundResource(R.drawable.background_for_calendar);
toast2.setView(view);
toast2.show();
}
break;
}
return true;
}
}
I have added the code related to the scene transititon which is in the adapter.
here is a gif of the problem when i add a scene transition
enter image description here
As u can see there are 2 pauses when going from 1st to 2nd activity 1st pause being longer 2nd one shorter. And also a pause when exiting the 2nd activity which seems to have the same duration as the 2nd pause.
I am having trouble with shuffling images in home screen in a wallpaper app. i want like when ever a person opens my app the images in the home screen should be shuffled . i tried using Collections.shuffle() method, in using that what is happening is the images are getting duplicated and when i click on the shuffled image to open in fullscreen some other image opens
suppose in a list A(0,1,2,3) when i shuffle it only the display changes but when i open it itopens according to the index of list A
please help me with the code as to where and how i have to use the Collections.shuffle method
here is my code .
I am troubled for many days and not getting the solution so please help
Homescreen.java
public class Homescreen extends AppCompatActivity {
RecyclerView recyclerView;
List<WallpaperModel> list;
private WallpaperAdapter adapter;
DatabaseReference reference;
public static final String TAG = Homescreen.class.getSimpleName();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_homescreen);
init();
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new GridLayoutManager(this,3));
list = new ArrayList<>();
adapter.shuffle();
adapter.notifyDataSetChanged();
adapter = new WallpaperAdapter(list);
recyclerView.setAdapter(adapter);
reference = FirebaseDatabase.getInstance().getReference().child("Wallpapers");
reference.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(#NonNull DataSnapshot snapshot) {
list.clear();
for (DataSnapshot dataSnapshot : snapshot.getChildren()){
WallpaperModel model = dataSnapshot.getValue(WallpaperModel.class);
list.add(model);
}
adapter.notifyDataSetChanged();
}
#Override
public void onCancelled(#NonNull DatabaseError error) {
Log.e(TAG,error.getMessage());
}
});
}
private void
init(){
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
recyclerView = findViewById(R.id.recyclerView);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.menu,menu);
return true;
}
#Override
public boolean onOptionsItemSelected(#NonNull MenuItem item) {
int id = item.getItemId();
if (id == R.id.favourite){
startActivity(new Intent(Homescreen.this, FavouriteActivity.class));
}
return true;
}
}
and this is my wallpaperAdapter class
public class WallpaperAdapter extends
RecyclerView.Adapter<WallpaperAdapter.WallpaperHolder> {
private static List<WallpaperModel> list;
public WallpaperAdapter(List<WallpaperModel> list) {
WallpaperAdapter.list = list;
}
#NonNull
#Override
public WallpaperHolder onCreateViewHolder(#NonNull ViewGroup parent, int
viewType) {
View view =
LayoutInflater.from(parent.getContext())
.inflate(R.layout.wallpaper_items,parent,false);
return new WallpaperHolder(view);
}
#Override
public void onBindViewHolder(#NonNull
WallpaperAdapter.WallpaperHolder holder, int position) {
Random random = new Random();
int color = Color.rgb(0,0,0);
Glide.with(holder.itemView.getContext().getApplicationContext())
.load(list.get(position).getImage())
.timeout(7500)
.into(holder.imageView);
holder.setClickListener();
}
#Override
public int getItemCount() {
return list.size();
}
public void shuffle() {
Collections.shuffle(list,new Random(System.currentTimeMillis()));
}
static class WallpaperHolder extends RecyclerView.ViewHolder{
private ImageView imageView;
public WallpaperHolder(#NonNull View itemView) {
super(itemView);
imageView = itemView.findViewById(R.id.imageView);
}
void setClickListener(){
//set on click listener on wallpaper image
itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
int position = getAdapterPosition();
Intent intent = new Intent(itemView.getContext().getApplicationContext(),
SwiperActivity.class);
intent.putExtra("position",position);
itemView.getContext().startActivity(intent);
}
});
}
}
}
This question already has answers here:
how to get ID of the items in recyclerview
(2 answers)
Closed 2 years ago.
I have recyclerview on my project . I want get item id . How Can I get item id ? . I used Item touchhelper and I need particular item id . How can I get particular item id .
Activty.java
public class todoactivity extends AppCompatActivity {
TextView title;
Button back;
ImageButton gorevo;
RecyclerView recyclerView;
List<String>Listsx = new ArrayList<>();
TodoActivityAdpter adapterx;
DatabaseHelper4 myDBxxx;
TextView textView;
CheckBox checkBox;
long id;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_todoactivity);
recyclerView=findViewById(R.id.recyclerviewxx);
recyclerView.setLayoutManager(new LinearLayoutManager(getApplicationContext()));
adapterx=new TodoActivityAdpter(Listsx);
recyclerView.setAdapter(adapterx);
title=findViewById(R.id.titlex);
textView=findViewById(R.id.text_viewx);
gorevo = findViewById(R.id.gorevo);
myDBxxx = new DatabaseHelper4(this);
Cursor datax = myDBxxx.getListContents();
if(datax.getCount() == 0){
}else{
while(datax.moveToNext()){
Listsx.add(datax.getString(1));
ListAdapter listAdapterx = new ArrayAdapter<>(this,R.layout.todoactivity_item,R.id.textitem,Listsx);
adapterx.notifyItemInserted(Listsx.size()-1);
}
}
gorevo.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
BottomSheetDialog bottomSheetDialog = new BottomSheetDialog(todoactivity.this);
bottomSheetDialog.setContentView(R.layout.bottomsheetlayout3);
bottomSheetDialog.show();
InputMethodManager inputMethodManager = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
inputMethodManager.toggleSoftInput(InputMethodManager.SHOW_FORCED,0);
EditText editText = bottomSheetDialog.findViewById(R.id.editx);
Button ekle = bottomSheetDialog.findViewById(R.id.ekle);
ekle.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
String text = editText.getText().toString();
Listsx.add(text);
AddDataxxx(text);
adapterx.notifyItemInserted(Listsx.size()-1);
bottomSheetDialog.hide();
inputMethodManager.hideSoftInputFromWindow(view.getWindowToken(),0);
}
});
}
});
back=findViewById(R.id.back);
back.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent i = new Intent(todoactivity.this, pomodoroscreen.class);
startActivity(i);
overridePendingTransition(0,0);
}
});
ItemTouchHelper.SimpleCallback simpleCallback = new ItemTouchHelper.SimpleCallback(0,ItemTouchHelper.LEFT) {
#Override
public boolean onMove(#NonNull RecyclerView recyclerView, #NonNull RecyclerView.ViewHolder viewHolder, #NonNull RecyclerView.ViewHolder target) {
return false;
}
#Override
public void onSwiped(#NonNull RecyclerView.ViewHolder viewHolder, int direction) {
int positionx = viewHolder.getAdapterPosition();
Listsx.remove(positionx);
adapterx.notifyItemRemoved(positionx);
myDBxxx.deleteItem(// I want get id in there);
}
};
ItemTouchHelper itemTouchHelper = new ItemTouchHelper(simpleCallback);
itemTouchHelper.attachToRecyclerView(recyclerView);
}
public void AddDataxxx(String newEntry) {
boolean insertDatax = myDBxxx.addDataxxx(newEntry);
}
}
MyAdapter.java
public class TodoActivityAdpter extends RecyclerView.Adapter<TodoActivityAdpter.Holder> {
List<String>Listsx;
public TodoActivityAdpter(List<String>itemxxx){
this.Listsx = itemxxx;
}
#NonNull
#Override
public TodoActivityAdpter.Holder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.todoactivity_item,parent,false);
Holder holder = new Holder(view);
return holder;
}
#Override
public void onBindViewHolder(#NonNull TodoActivityAdpter.Holder holder, int position) {
holder.textView.setText(Listsx.get(position));
holder.checkBox.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if (holder.checkBox.isChecked()) {
holder.textView.setTextColor(view.getResources().getColor(R.color.grey));
} else {
holder.textView.setTextColor(view.getResources().getColor(R.color.Color_black));
}
}
});
}
#Override
public int getItemCount() {
return Listsx.size();
}
public class Holder extends RecyclerView.ViewHolder {
CheckBox checkBox;
TextView textView;
List<String>Listsx;
RecyclerView recyclerView;
Context mContext;
public Holder(View view) {
super(view);
textView=view.findViewById(R.id.text_viewx);
checkBox=view.findViewById(R.id.checkbox);
recyclerView=view.findViewById(R.id.recyclerviewxx);
}
}
}
I want get item id in Activty . How Can I get item id . Can you be fast . My actvity is activity.java . My adapter is MyAdapter.java
int positionx = viewHolder.getAdapterPosition();
int id = recyclerView.getChildAt(position).getId();
Listsx.remove(positionx);
adapterx.notifyItemRemoved(positionx);
myDBxxx.deleteItem(id);
maybe
I am trying to delete multiple items from recyclerView. The items in the recyclerView has an attribute isSelected. I am setting the attribute isSelected to true when user clicks on the recyclerView item. After selection user can click delete button present in the options menu to delete the selected items. The code has unexpected behaviour, like when delete button is pressed, some of the selected items are deleted while some are not. Also some of the items get automatically selected at random positions.
Model.java
public class Model {
private String text;
private boolean isSelected = false;
public Model(String text) {
this.text = text;
}
public String getText() {
return text;
}
public void setSelected(boolean selected) {
isSelected = selected;
}
public boolean isSelected() {
return isSelected;
}
}
RecyclerViewAdapter.java
public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.MyViewHolder> {
private List<Model> mModelList;
private Context mCtx;
public RecyclerViewAdapter(Context ctx, List<Model> modelList) {
this.mModelList = modelList;
this.mCtx = ctx;
}
#Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater inflater = LayoutInflater.from(mCtx);
View view = inflater.inflate(R.layout.item_row, parent, false);
return new MyViewHolder(view);
}
#Override
public void onBindViewHolder(final MyViewHolder holder, final int position) {
final Model model = mModelList.get(position);
holder.view.setBackgroundColor(model.isSelected() ? Color.CYAN : Color.WHITE);
holder.tvItems.setText(model.getText());
holder.tvItems.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
model.setSelected(!model.isSelected());
holder.tvItems.setBackgroundColor(model.isSelected() ? Color.CYAN : Color.WHITE);
notifyItemChanged(position);
}
});
}
#Override
public int getItemCount() {
return mModelList == null ? 0 : mModelList.size();
}
public class MyViewHolder extends RecyclerView.ViewHolder {
private TextView tvItems;
private View view;
public MyViewHolder(View itemView) {
super(itemView);
view = itemView;
tvItems = itemView.findViewById(R.id.tvItems);
}
}
}
MainActivity.java
public class MainActivity extends AppCompatActivity {
private List<Model> mModelList;
private RecyclerView mRecyclerView;
private RecyclerView.Adapter mAdapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mRecyclerView = (RecyclerView) findViewById(R.id.rvListItems);
mAdapter = new RecyclerViewAdapter(this, getListData());
LinearLayoutManager manager = new LinearLayoutManager(MainActivity.this);
mRecyclerView.setHasFixedSize(true);
mRecyclerView.setLayoutManager(manager);
mRecyclerView.setAdapter(mAdapter);
}
private List<Model> getListData() {
mModelList = new ArrayList<>();
for (int i = 1; i <= 25; i++) {
mModelList.add(new Model("TextView " + i));
}
return mModelList;
}
private void deleteSelectedItems() {
if (mModelList != null){
for (int i=0; i<mModelList.size(); i++){
if (mModelList.get(i).isSelected()){
Log.d("testingTAG", String.valueOf(i));
mModelList.remove(i);
mAdapter.notifyItemRemoved(i);
mAdapter.notifyItemRangeChanged(i, mModelList.size());
i--;
}
}
}
}
#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) {
switch (item.getItemId()){
case R.id.action_delete:
deleteSelectedItems();
break;
}
return super.onOptionsItemSelected(item);
}
}
Any kind of help will be greatly appreciated.
You should use holder.getAdapterPosition() inside your clicklistener .Change your onclick as given below and try.
public void onClick(View view) {
final Model model = mModelList.get(holder.getAdapterPosition());
model.setSelected(!model.isSelected());
holder.tvItems.setBackgroundColor(model.isSelected() ? Color.CYAN : Color.WHITE);
notifyItemChanged(holder.getAdapterPosition());
}
Answer from #pop selects items, change background color to CYAN if item is selected and inverse selected flag of Model class instance.
you should delete selected items from your mModelList using a iterator, you can't delete items from list inside for loop
Calling remove in foreach loop in Java