Develop Reference

Checked the Checkboxes that is already checked

I have one EditText (edModelColor). when user click on edModelColor(EditText) then the custom dialog will be called.Custom dialog consist of RecylerView and searchview and one custom row for each item. Custom row contains ImageView(icon), TextView (colorNames) and checkbox for selection. When user click on any checkbox I passed the colorName and its position in adapter into method checkAndRemove. this method will add or remove the color name according to its adapter position and the colorNames will added into edModelColor(EditText). its working fine but the problem is that once the user click on edModelColor(EditText) again, I want to checked those checkboxes which are already checked inside CustomDialogbox.I have seen some articles online but I could not understand what they meant.
bodyColorDialog:
private void bodyColorDialog() {
TextView txtClose;
TextView tvCancel;
Button btnOk;
bodyColorDialog.setContentView(R.layout.ed_body_color_dialog);
bodyColorDialog.setCancelable(false);
txtClose = bodyColorDialog.findViewById(R.id.txtModelClose);
tvCancel = bodyColorDialog.findViewById(R.id.tvCancel);
btnOk = bodyColorDialog.findViewById(R.id.btnOk);
edBodyColorSearchView = bodyColorDialog.findViewById(R.id.edBodyColorSearchViewColor);
edBodyColorRecylerView = bodyColorDialog.findViewById(R.id.edBodyColorRecylerView);
edBodyColorRecylerView.setLayoutManager(new LinearLayoutManager(getContext()));
bodyColorArrayList.clear();
setUpBodyColorArrayList();
btnOk.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
selectionCMap = new HashMap<>();
selectionCMap = edBodyColorAdapter.selectionColorsMap;
for(String value : selectionCMap.values()){
/* tv.setText(tv.getText() + "\n" + value);*/
edBodyColor.append(value + ",");
}
bodyColorDialog.dismiss();
}
});
txtClose.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
bodyColorDialog.dismiss();
}
});
tvCancel.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
bodyColorDialog.dismiss();
}
});
bodyColorDialog.show();
}
private void setUpBodyColorArrayList() {
bodyColorArrayList.clear();
String bodyColorName[] = getResources().getStringArray(R.array.body_color_array);
int bodyColorIcons[] = {R.drawable.red, R.drawable.black, R.drawable.violet, R.drawable.white,
R.drawable.orange, R.drawable.blue, R.drawable.green, R.drawable.yello};
for(int i =0; i < bodyColorIcons.length; i++)
{
bodyColorArrayList.add(new edModelBodyColor(bodyColorName[i], bodyColorIcons[i]));
}
edBodyColorAdapter = new edBodyColorAdapter(getContext(), bodyColorArrayList);
edBodyColorRecylerView.setAdapter(edBodyColorAdapter);
edBodyColorSearchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
#Override
public boolean onQueryTextSubmit(String queryString) {
edBodyColorAdapter.getFilter().filter(queryString);
return false;
}
#Override
public boolean onQueryTextChange(String queryString) {
edBodyColorAdapter.getFilter().filter(queryString);
return false;
}
});
}
edBodyColorAdapter.java
holder.checkBoxColor.setOnCheckedChangeListener(new
CompoundButton.OnCheckedChangeListener() {
#Override
public void onCheckedChanged(CompoundButton compoundButton, boolean isChecked) {
int position = holder.getAdapterPosition();
clickedColorNamePosition = edBodyColorArrayList.indexOf(filteredArrayList.get(position));
String name = edBodyColorArrayList.get(clickedColorNamePosition).getBodyColorName();
Toast.makeText(context, "name = " + name, Toast.LENGTH_SHORT).show();
//this mthod will check if selected checkbox value is already present or not.
// It present then remove ( means user unchecked box) and if value is not there means user has selected checkbox
checkAndRemove(position,name);
}
});
checkAndRemove:
private void checkAndRemove(int position, String name) {
if(selectionColorsMap.containsKey(position)){
selectionColorsMap.remove(position);
Toast.makeText(context, "removed", Toast.LENGTH_SHORT).show();
}else {
selectionColorsMap.put(position, name);
Toast.makeText(context, "added", Toast.LENGTH_SHORT).show();
}
}
preview:
Conculusion: I want to check these checkboxes values when user click again on edBodyColor dialog..

I as can see, you are initializing the ArrayList of colors every time you are showing the dialog, that's why, you start always at initial state.
Instead, you should initialized the ArrayList inside onCreate() and reuse it every time to maintain the previous state.

Put ID autoincrement After Pass 2 ScreenActivity SQLite

I'm stuck for few days, and unfortunately dont know how to fix it.
I have DetailScreen.java that show data from MainScreen (one of recyclerview's list).
I tried this code but there is no effect, when i try to change use
COLUMN_NOMOR in my update function, i can change the name but
getting error when change the nomor. I guess, its right to use
COLUMN_ID in my update function because id is my PK-AI. So whether
because I didnt call COLUMN_ID in my DetailScreen? But how i can call my
id in my DetailsScreen also in my UpdateScreen?
If the data success updated, the screen will be automatically go to the DetailScreen again, but still showing old data. I had to go to MainActivity first to get the new data. Where code should i modified?
Here my Update function in my DBHandler.java
public int updateDataSiswa(Siswa siswa) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(COLUMN_NOMOR, siswa.getNomor());
values.put(COLUMN_NAMA, siswa.getNama());
return db.update(TABLE_SISWA, values, COLUMN_ID + " = ?",
new String[]{String.valueOf(siswa.getId())});
}
Here DetailScreen.java
public class DetailScreen extends AppCompatActivity {
private TextView txt_resultnomor, txt_resultnama;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.screen_details);
//put data
Intent i = getIntent();
final String id = i.getExtras().getString("id");
final String nomor = i.getExtras().getString("nomor");
final String nama = i.getExtras().getString("nama");
//inisialisasi
txt_resultnomor = (TextView) findViewById(R.id.txt_resultnomor);
txt_resultnama = (TextView) findViewById(R.id.txt_resultnama);
//set
txt_resultnomor.setText(nomor);
txt_resultnama.setText(nama);
}
#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_detail, menu);
return true;
}
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.action_edit) {
Intent in = new Intent(this, UpdateScreen.class);
in.putExtra("nomor", txt_resultnomor.getText().toString());
in.putExtra("nama", txt_resultnama.getText().toString());
startActivity(in);
}
if (id == R.id.action_delete) {
return true;
}
if (id == R.id.action_settings) {
// Intent i = new Intent(this, About.class);
//startActivity(i);
}
return super.onOptionsItemSelected(item);
}
}
Then here my UpdateScreen.java
public class UpdateScreen extends AppCompatActivity {
private EditText et_nomor;
private EditText et_nama;
private Button button_updatedata;
private DBHandler dbHandler;
private SiswaAdapter adapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_update_screen);
dbHandler = new DBHandler(this);
initComponents();
}
private void initComponents(){
et_nomor = (EditText) findViewById(R.id.et_nomor);
et_nama = (EditText) findViewById(R.id.et_nama);
//ambil data
Intent in=getIntent();
final String id=in.getExtras().getString("id_siswa");
final String nomor=in.getExtras().getString("nomor");
final String nama=in.getExtras().getString("nama");
//set inisial
et_nomor.setText(nomor);
et_nama.setText(nama);
button_updatedata = (Button) findViewById(R.id.button_updatedata);
button_updatedata.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
validasiForm();
}
});
}
private void validasiForm() {
String form_nomor = et_nomor.getText().toString();
String form_nama = et_nama.getText().toString();
if (form_nomor.isEmpty()){
et_nomor.setError("Nomor belum diisi");
et_nomor.requestFocus();
}
else if (form_nama.isEmpty()){
et_nama.setError("Nama belum diisi");
et_nama.requestFocus();
}
else {
dbHandler.updateDataSiswa(new Siswa(form_nomor, form_nama));
List<Siswa> siswaList = dbHandler.getSemuaSiswa();
adapter = new SiswaAdapter(siswaList);
adapter.notifyDataSetChanged();
Toast.makeText(UpdateScreen.this, "Berhasil Memperbarui Data Siswa", Toast.LENGTH_SHORT).show();
MainSiswaActivity.mma.refresh();
finish();
}
}
}
I hope i tell clearly, help me please. Thanks.

where is your call to the update method you given public int updateDataSiswa(Siswa siswa)..? Also based on what you have provided...your notifyDataSetChanged() for adapter just tries to update the listview of the RecyclerView..
but it does not understand what underlying data has changed for it..you need to create a method for your Database Handler where you can fetch a List of new records..and then use this method to update your adapter with it and then set the new adapter to your listView in validasiForm() method..
please check this for more details...Android ListView not refreshing after notifyDataSetChanged

How I can change state of widget switch from check to uncheck?

I want to recieve data from thingspeak and change automatically state of switch from checked to unchecked or vice versa.
This is my code, but it doesn't work, just can set text but can't change state.
Please help me!
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button = (Button) findViewById(R.id.button);
myswitch1 = (Switch) findViewById(R.id.switch1);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Thread t = new Thread(new Runnable() {
#Override
public void run() {
postdata2();
}
});
t.start();
now_da1.setText(get_da1);
if(get_dk1 == "1") {
myswitch1.setChecked(False);
}
else if (get_dk1 =="0") {
myswitch1.setChecked(True);
}
}
});
myswitch1.setOnCheckedChangeListener(new OnCheckedChangeListener() {
#Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if (isChecked) {
t1 = "1";
} else {
t1 = "0";
}
}
});
public void postdata2() {
HttpRequest mReq = new HttpRequest();
get_t1 = mReq.sendGet("https://thingspeak.com/channels/106453/field/1/last");
get_da1 = get_t1.substring(0, 2);
get_dk1 = get_t1.substring(3, 3);
Log.d(myGet, get_dk1);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
}

use this myswitch1.setChecked(false); to uncheck and myswitch1.setChecked(true); to make it checked.
Happy Coding :)

When comparing the value of two Strings always use the equals() method which compares the values instead of using == which compares the object references.
For example:
String first = "1";
String second = "1";
first == second will return false because they are not referencing to the same object. However, first.equals(second) will return true because the value of the two Strings are identical.
You can try replacing the conditions with this:
if (get_dk1.equals("1")) {
myswitch1.setChecked(false);
} else if (get_dk1.equals("0")) {
myswitch1.setChecked(true);
}

Understanding and fixing instance handling between classes

Im having issues with the app crashing with nullpoint exception.
I know that it crashes when trying to get an ArrayList from pictureTalkFragment. which in this class is only set to PictureTalkFragment ptf;
In other words im trying to get an element (have both getter/setter for the arraylist in ptf, and made the arraylist public as an alternative) from an class and not the instance of that class.
But im just to noob to figure out how to correctly handle getting the instances between classes (activity ---> fragments and back etc). In Java i usually just had an referance in the Constructor that sent the instance/referance with the creation of the new class. But in Android theres all this onCreate (getActivity,getContext ++), Im confused:P When to user where and how:(
the EditPicture was started from this code in GridViewAdapter that extended from PictureTalkFragment (edit in onlongclicklistener)
row.setOnLongClickListener(new View.OnLongClickListener()
{
#Override
public boolean onLongClick(View v) {
PopupMenu popMenu = new PopupMenu(v.getContext(), v);
popMenu.getMenuInflater().inflate(R.menu.picturetalk_popup_menu, popMenu.getMenu());
popMenu.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
#Override
public boolean onMenuItemClick(MenuItem menuItem) {
switch (menuItem.getItemId()) {
case R.id.edit:
Intent intent = new Intent(getContext(), EditPicture.class);
intent.putExtra("itemUUID", item.getId());
String s = new String("");
context.startActivity(intent);
break;
case R.id.remove:
FileInteraction fileInteraction = new FileInteraction();
fileInteraction.deleteFilesAndFolder(item.getImagePath());
item.setTitle("");
notifyDataSetChanged();
break;
default:
//
}
return true;
}
});
popMenu.show();
return true;
}
});
return row;
EditPicture class
public class EditPicture extends Activity {
private EditText text;
private Button applyBtn;
private ArrayList<PictureItem> piArray;
private PictureItem pi;
private UUID itemID;
private PictureTalkFragment ptf;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
itemID = (UUID) getIntent().getSerializableExtra("itemUUID");
SetLocalArray(ptf.getArray()); //Nullpoint here, and i know why. But not how to get the allready created instance of this class
getPictureItem();
setContentView(R.layout.picturetalk_edit_pic);
text = (EditText) findViewById(R.id.editName);
text.setText(pi.getTitle());
applyBtn = (Button) findViewById(R.id.applyChangeBtn);
applyBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
updatePictureItem();
ptf.setArray(piArray);
}
});
}
private void updatePictureItem() {
pi.setTitle(text.toString());
piArray.add(pi);
ptf.setArray(piArray);
}
private void SetLocalArray(ArrayList<PictureItem> array) {
this.piArray = array;
}
private PictureItem getPictureItem() {
pi = new PictureItem("", "");
for (int i = 0; i < piArray.size(); i++) {
if (itemID.equals(piArray.get(i))) {
pi = piArray.get(i);
piArray.remove(i);
}
}
return pi;
}}

I don't know what you are using the array for.
Usually you should not depend on the fragment to get the info, if you want to pass an array of objects to the activity, you should use the Bundle in the activity extras to do so, instead of passing only the UUID, just pass also the array you need.
If you want the lazy option just make a class with a static variable to store the fragment and use it in the activity, which I don't advise.

how can i refresh a listview after a new item is added to the list?

i know this question has been asked a couple of times before and i tried all of the suggestions there and i still cant refresh my list view after i add a new item to the list
can anyone please try to explain how can i do it?
thnaks
this is the code of the adding:
public class MainActivity extends ListActivity {
private DBHandler dataBase;
private ArrayList<Movies> list;
private ArrayAdapter<Movies> adapter;
private ListView lv;
private ImageButton addMovie;
private Intent intent;
final static int FLAG_FOR_ADDING=1;
final static int FLAG_FOR_EDITING=2;
final static int FLAG_FROM_MENU=3;
private int selected_movie;
private String the_movie;
private String movie_title;
private String movie_description;
private String movie_url;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main);
dataBase = new DBHandler(MainActivity.this);
// by pressing this button the user will get instructions about how to use this application
Button start = (Button)findViewById(R.id.how_to_start);
start.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View arg0) {
Toast.makeText(MainActivity.this, "Press the plus button for adding a movie or the menu button for the menu", Toast.LENGTH_LONG).show();
}
});
// by pressing this button, the menu of this application will open
ImageButton menu = (ImageButton)findViewById(R.id.menu_context);
menu.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
openOptionsMenu();
}
});
addMovie = (ImageButton)findViewById(R.id.add_movie);
addMovie.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
registerForContextMenu(addMovie);
openContextMenu(addMovie);
}
});
// the array list is getting the movies from the database
list = dataBase.getAllMovies();
// here i am setting the adapter that will handle the list
adapter = new ArrayAdapter<Movies>(MainActivity.this, R.layout.row,list);
// i am getting a default xml
lv=getListView();
// i am connecting between the list and the adapter
lv.setAdapter(adapter);
// by short pressing an item on the list the user will move to the edit_a_movie page
// in order to edit the movie
lv.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
intent = new Intent(MainActivity.this,Edit_A_Movie.class);
// i am sending the information of the item that been pressed to the edit_a_movie page
// the id, title,description and the url_photo
intent.putExtra("item_id", list.get(position).getId());
intent.putExtra("item_title", list.get(position).getTitle().toString());
intent.putExtra("item_description", list.get(position).getDescription().toString());
intent.putExtra("item_url", list.get(position).getPhoto_url().toString());
startActivityForResult(intent, FLAG_FOR_EDITING);
}
});
// a long press on a movie in the list will open a context menu for deleting or editing the item
lv.setOnItemLongClickListener(new OnItemLongClickListener() {
#Override
public boolean onItemLongClick(AdapterView<?> parent, View view,
int position, long id) {
// i am getting the information of the movie that was pressed
selected_movie = list.get(position).getId();
the_movie = String.valueOf(selected_movie);
movie_title = list.get(position).getTitle().toString();
movie_description = list.get(position).getDescription().toString();
movie_url = list.get(position).getPhoto_url().toString();
// i register to a context menu
registerForContextMenu(lv);
openContextMenu(lv);
return true;
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch(item.getItemId()){
// by pressing the exit option, the user will exit the application
case R.id.menu_exit:
finish();
android.os.Process.killProcess(android.os.Process.myPid());
super.onDestroy();
break;
// this option will delete all the movies from the list
case R.id.menu_delete:
dataBase.deleteAllMovies();
break;
default:
break;
}
return super.onOptionsItemSelected(item);
}
#Override
public void onCreateContextMenu(ContextMenu menu, View v,
ContextMenuInfo menuInfo) {
super.onCreateContextMenu(menu, v, menuInfo);
// if the user will press the menu button he will get the menu and if he will press
// the plus button he will get 2 options: 1. move to the edit a movie page
// 2. move to the search a movie from the Internet page
// if the user will press a long press on a movie he will get 2 options:
//1. update the movie
//2. delete the movie
if(v.getId() == R.id.menu_context){
getMenuInflater().inflate(R.menu.main, menu);
}
else if (v.getId() == R.id.add_movie){
getMenuInflater().inflate(R.menu.aad_menu, menu);
}
else {
getMenuInflater().inflate(R.menu.edit_or_delete, menu);
}
}
#Override
public boolean onContextItemSelected(MenuItem item) {
switch(item.getItemId()){
// selecting this option will exit the application
case R.id.menu_exit:
finish();
android.os.Process.killProcess(android.os.Process.myPid());
super.onDestroy();
break;
// this option will delete all the movies from the list
case R.id.menu_delete:
dataBase.deleteAllMovies();
break;
// this option will move the user to the edit a movie page
case R.id.move_to_edit:
intent = new Intent(MainActivity.this,Edit_A_Movie.class);
startActivityForResult(intent, FLAG_FOR_ADDING);
break;
// this option will get the user move to the add a movie from the Internet page
case R.id.move_to_search:
break;
// if the user will press on a movie he will be able to update the movie or delete it
//this option will delete the movie
case R.id.delete_menu_movie:
dataBase.deleteMovie(the_movie);
break;
// this option will move the user to the edit_a_movie page
case R.id.edit_menu_movie:
intent = new Intent(MainActivity.this,Edit_A_Movie.class);
// i am sending the information of the pressed movie
intent.putExtra("item_id",selected_movie);
intent.putExtra("item_title", movie_title);
intent.putExtra("item_description", movie_description);
intent.putExtra("item_url", movie_url);
startActivityForResult(intent, FLAG_FROM_MENU);
break;
default:
break;
}
return super.onContextItemSelected(item);
}
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
super.onActivityResult(requestCode, resultCode, data);
// this is the info i am getting from the edit_a_movie page in order to put it in the database
// i am using it to add a new movie to the list
if(requestCode==FLAG_FOR_ADDING && resultCode==RESULT_OK){
// this is the info i received
String title_from_adding = data.getStringExtra("user_title");
String description_from_adding = data.getStringExtra("user_desciption");
String url_from_adding = data.getStringExtra("user_url");
// here i am putting the info in the database
dataBase.addMovie(title_from_adding, description_from_adding, url_from_adding);
// in case that the user pressed the cancel button he will get a massage
} else if
(requestCode==FLAG_FOR_ADDING && resultCode==RESULT_CANCELED){
Toast.makeText(MainActivity.this, "No movie has been added", Toast.LENGTH_LONG).show();
}
// i am using the info from the edit_a_movie page in order to update a movie
else if
(requestCode==FLAG_FOR_EDITING && resultCode==RESULT_OK ){
String position_from_editing = data.getStringExtra("position");
String title_from_editing = data.getStringExtra("user_title");
String description_from_editing = data.getStringExtra("user_desciption");
String url_from_editing = data.getStringExtra("user_url");
// the database is being updating
dataBase.updateMovie(position_from_editing, title_from_editing, description_from_editing, url_from_editing);
}
// this case is for editing the movie that was long pressed
else if
(requestCode==FLAG_FROM_MENU && resultCode==RESULT_OK){
// i am receiving the updated information from the edit_a_movie page
String position_from_menu = data.getStringExtra("position");
String title_from_menu = data.getStringExtra("user_title");
String description_from_menu = data.getStringExtra("user_desciption");
String url_from_menu = data.getStringExtra("user_url");
//the database is being updating with the new information
dataBase.updateMovie(position_from_menu, title_from_menu, description_from_menu, url_from_menu);
}
}
}

You should call notifyDataSetChanged on the adapter.
After dataBase.addMovie(..)
adapter.notifyDataSetChanged();