Develop Reference

Text out of text view

I am currently having a problem with Android application. I am using a table layout with some views in it. The problem is that it seems like the TextView does not wraps the text correctly. However, when I change swipe between fragments it just resizes and it fits as how its supposed to.
This is what is looks like in the first place when the onCreate function is called.
And this is how it looks when I swipe between fragments.
This is the method I used to set up the views inside the table.
private void initializeBookTable(final List<Book> bookList, View view, final Button modifyBtn, final Button deleteBtn)
{
//Get screen width
DisplayMetrics displaymetrics = new DisplayMetrics();
((Activity)getContext()).getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);
int screenWidth = displaymetrics.widthPixels;
TableLayout table = view.findViewById(R.id.book_tableLayout);
//Border for the text views
final GradientDrawable gd = new GradientDrawable();
gd.setColor(getResources().getColor(R.color.colorTeal));
gd.setCornerRadius(2);
gd.setStroke(2, 0xFF000000);
//Font for the text views
Typeface font = Typeface.create("casual",Typeface.BOLD);
//Header row
TableRow headerRow = new TableRow(this.getContext());
TableLayout.LayoutParams headerRowParams = new TableLayout.LayoutParams(TableRow.LayoutParams.WRAP_CONTENT,TableRow.LayoutParams.WRAP_CONTENT);
headerRowParams.setMargins(0,1,0,0);
headerRow.setLayoutParams(headerRowParams);
//Header name text view
TextView headerName = new TextView(this.getContext());
headerName.setText(getResources().getString(R.string.book_NAME));
headerName.setBackground(gd);
headerName.setPadding(20,0,20,0);
headerName.setTypeface(font);
headerName.setTextColor(Color.BLACK);
headerName.setMinWidth(screenWidth/4);
headerRow.addView(headerName);
//Header chapter text view
TextView headerChapter = new TextView(this.getContext());
headerChapter.setText(getResources().getString(R.string.book_CHAPTER));
headerChapter.setBackground(gd);
headerChapter.setPadding(20,0,20,0);
headerChapter.setTypeface(font);
headerChapter.setTextColor(Color.BLACK);
headerChapter.setMinWidth(screenWidth/4);
headerRow.addView(headerChapter);
//Header page text view
TextView headerPage = new TextView(this.getContext());
headerPage.setText(getResources().getString(R.string.book_PAGE));
headerPage.setBackground(gd);
headerPage.setPadding(20,0,20,0);
headerPage.setTypeface(font);
headerPage.setTextColor(Color.BLACK);
headerPage.setMinWidth(screenWidth/4);
headerRow.addView(headerPage);
//Header name text view
TextView headerStatus = new TextView(this.getContext());
headerStatus.setText(getResources().getString(R.string.book_STATUS));
headerStatus.setBackground(gd);
headerStatus.setPadding(20,0,20,0);
headerStatus.setTypeface(font);
headerStatus.setTextColor(Color.BLACK);
headerStatus.setMinWidth(screenWidth/4);
headerRow.addView(headerStatus);
//Add row to table
table.addView(headerRow);
for(int i = 0; i < bookList.size(); i++)
{
TableRow row = new TableRow(this.getContext());
//Set text views parameters
TableRow.LayoutParams textViewParams = new TableRow.LayoutParams(TableRow.LayoutParams.WRAP_CONTENT, TableRow.LayoutParams.WRAP_CONTENT);
textViewParams.setMargins(0,1,0,1);
row.setLayoutParams(textViewParams);
//Set text views parameters
TextView name = new TextView(this.getContext());
name.setText(bookList.get(i).getName());
name.setBackground(gd);
name.setPadding(20,0,20,0);
name.setLayoutParams(textViewParams);
TextView chapter = new TextView(this.getContext());
chapter.setText(bookList.get(i).getChapter());
chapter.setBackground(gd);
chapter.setPadding(20,0,20,0);
chapter.setLayoutParams(textViewParams);
TextView page = new TextView(this.getContext());
page.setText(bookList.get(i).getPage());
page.setBackground(gd);
page.setPadding(20,0,20,0);
page.setLayoutParams(textViewParams);
TextView status = new TextView(this.getContext());
status.setText(bookList.get(i).getStatus());
status.setBackground(gd);
status.setPadding(20,0,20,0);
status.setLayoutParams(textViewParams);
//Add text views to the row
row.addView(name);
row.addView(chapter);
row.addView(page);
row.addView(status);
row.setClickable(true);
//Click listener for each row
row.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
TableRow tableRow = (TableRow) view;
selectedRow = tableRow;
//If the row is already selected (in red) deselect it
TextView textViewCheck = (TextView) tableRow.getChildAt(0);
if(selection && textViewCheck.getText().toString().equals(selectedBook.getName()))
{
for(int i = 0; i < 4; i++)
{
TextView textView = (TextView) tableRow.getChildAt(i);
textView.setBackground(gd);
}
//Disable add and modify buttons when row is deselected
modifyBtn.setEnabled(false);
deleteBtn.setEnabled(false);
selection = false;
selectedBook = null;
}
//If the row is not in red check if there is already a selected row
else
{
if(selection)
{
String message = "Please select only one";
Toast.makeText(getContext(), message, LENGTH_SHORT).show();
}
else
{
for(int i = 0; i < 4; i++)
{
TextView textView = (TextView) tableRow.getChildAt(i);
textView.setBackgroundColor(Color.RED);
}
//Enable add and modify buttons when row is selected
modifyBtn.setEnabled(true);
deleteBtn.setEnabled(true);
TextView nameView = (TextView) tableRow.getChildAt(0);
selectedBook = storage.findBook(nameView.getText().toString());
selection = true;
}
}
}
});
//Set row parameters
TableRow.LayoutParams tableRowParams = new TableRow.LayoutParams(TableRow.LayoutParams.WRAP_CONTENT,TableRow.LayoutParams.WRAP_CONTENT);
tableRowParams.setMargins(0,1,0,1);
row.setLayoutParams(tableRowParams);
table.addView(row);
}
}
This is my onCreate
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState)
{
View view = inflater.inflate(R.layout.books_fragment,container,false);
storage = InternalStorage.getInstance(this.getContext());
final Button modifyBtn = view.findViewById(R.id.modifyBtn);
final Button deleteBtn = view.findViewById(R.id.deleteBtn);
//Disable modify and delete buttons
modifyBtn.setEnabled(false);
deleteBtn.setEnabled(false);
this.initializeBookTable(storage.getBookList(),view, modifyBtn, deleteBtn);
Button addBtn = view.findViewById(R.id.addBtn);
addBtn.setOnClickListener(new View.OnClickListener()
{
#Override
public void onClick(View view) {
Intent intent = new Intent(getActivity(), AddModifyBook.class);
startActivity(intent);
}
});
modifyBtn.setOnClickListener(new View.OnClickListener()
{
#Override
public void onClick(View view)
{
Intent intent = new Intent(getActivity(), AddModifyBook.class);
//Passing the selected book to the AddModifyBook activity
intent.putExtra("selectedBook",selectedBook);
startActivity(intent);
selectedBook = null;
selection = false;
}
});
final TableLayout table = view.findViewById(R.id.book_tableLayout);
deleteBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
storage.removeBook(selectedBook);
selectedBook = null;
selection = false;
modifyBtn.setEnabled(false);
deleteBtn.setEnabled(false);
table.removeView(selectedRow);
}
});
return view;
}
And for onResume I have the default.
Another thing that is happening is that if I just set the background of the name (the first column) with the gradient drawable gd then it works but If I set the rest background of the rest of the columns then I have the problem that I have already explained.

So apparently I have managed to solve the issue by using a gradient drawable for the name and a different gradient drawable for the other properties.

How can i remove the data of a row with a button click?

After clicking a button my code creates a row in table with a TextView , an EditView and a delete button. The delete button is programmed to delete the row from the table (which successfully does) and the date from a list in Notes.class (which is the problem). To confirm this action i have a text view to count the list size with the dates and when i press the delete button nothing is changed.
Sorry if this is a silly question but i am really new to Android :)
The button handler
public void addButtonHandler(View view) {
TableLayout tl = (TableLayout) findViewById(R.id.subs_table);
TableRow tr = new TableRow(this);
tr.setLayoutParams(new TableRow.LayoutParams(TableRow.LayoutParams.MATCH_PARENT, TableRow.LayoutParams.WRAP_CONTENT));
//get the date in string
String date = new SimpleDateFormat("dd-MM-yyyy").format(new Date());
//the TextView with the date
TextView tv = new TextView(this);
tv.setText(date);
tv.setTextSize(TypedValue.COMPLEX_UNIT_SP , 18);
//editText with the type
final EditText et = new EditText(this);
TableRow.LayoutParams params = new TableRow.LayoutParams(getPx(50), ViewGroup.LayoutParams.WRAP_CONTENT);
params.setMargins(getPx(130),0,getPx(40),0);
et.setLayoutParams(params);
SharedPreferences prefs = getSharedPreferences(SubsPREFERENCES , MODE_PRIVATE); // get notes object
Gson gsonN = new Gson();
String jsonN = prefs.getString("DATES" , "");
final Notes notes = gsonN.fromJson(jsonN , Notes.class);
//button for deleting row
ImageButton imageButton = new ImageButton(this);
TableRow.LayoutParams imageParams = new TableRow.LayoutParams(50,70);
imageParams.setMargins(5 ,0 ,0 ,0);
imageButton.setLayoutParams(imageParams);
imageButton.setImageResource(R.drawable.ok);
imageButton.setClickable(true);
imageButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
ViewGroup parent = (ViewGroup) view.getParent();
ViewGroup gradnparent = (ViewGroup) parent.getParent();
gradnparent.removeView(parent);
notes.delete(tv.getText().toString()); // this does not seem to work
}
}
);
// Adding views in row
tr.addView(tv);
tr.addView(et);
tr.addView(imageButton);
// Adding row in table
tl.addView(tr, new TableLayout.LayoutParams(TableLayout.LayoutParams.MATCH_PARENT
, TableLayout.LayoutParams.WRAP_CONTENT));
//add info in note
notes.addNote(date , et.getText().toString());
// saving the changes in notes
SharedPreferences sharedPreferences =getSharedPreferences(SubsPREFERENCES ,MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPreferences.edit();
String json1 = gsonN.toJson(notes);
editor.putString("DATES" , json1);
editor.apply();
//display the number of objects in list
TextView textView = (TextView) findViewById(R.id.textView);
textView.setText(String.valueOf(notes.getNum_dates()));
}
The notes class
package com.uni.notes;
public class Notes {
private ArrayList<String> list =new ArrayList<String>();
private ArrayList<String> type =new ArrayList<String>();
public Notes() {}
public int getNum_dates() {return list.size();}
public void addNote(String date ,String typeN) {
list.add(date);
type.add(typeN);
}
public String getDate (int pos){
return list.get(pos);
}
public String getType (int pos) {return type.get(pos);}
public void delete (String thing) {
for (String element : list){
if (element.equals(thing) ){
list.remove(element);
}
}
}
}

Just after
notes.delete(et.getText().toString()); // this does not seem to work
move your textview counting element update :
notes.delete(et.getText().toString()); // this does not seem to work
//display the number of objects in list
TextView textView = (TextView) findViewById(R.id.textView);
textView.setText(String.valueOf(notes.getNum_dates()));
This will update the counting Textview rigth after you clicked the delete button.

Approach to get values of a dynamically generated textView

I successfully created a dynamic TextView and a Button now when ever the button was clicked the value of a TextView changes.
But the problem is I have a final "submit button" outside a loop which should get the INDIVIDUAL values of each TextView and I cant think of a way how to do it can someone pls give me an approach for this thanks!. pls be nice..
code
Cursor citem= sdb.rawQuery("SELECT * FROM ITEM INNER JOIN CATEGORY ON item.categoryid = category.id where category.categoryname='"+fcat+"'", null);
ScrollView scrollView= new ScrollView(this);
LinearLayout mainLayout= new LinearLayout(this);
mainLayout.setOrientation(LinearLayout.VERTICAL);
Button border = new Button(this);
border.setId(Integer.parseInt(cuser.getString(cuser.getColumnIndex("id"))));;
border.setText("ORDER");
while (citem.moveToNext())
{
byte[] blob =citem.getBlob(citem.getColumnIndex("itemimage"));
int id = Integer.parseInt(citem.getString(citem.getColumnIndex("id")));
LinearLayout linearLayout = new LinearLayout(this);
linearLayout.setOrientation(LinearLayout.HORIZONTAL);
linearLayout.setTag(id);
int i;
ImageView iv = new ImageView(this);
iv.setId(id);
iv.setImageBitmap(dh.getPhoto(blob));
final TextView txtquantity = new TextView(this);
txtquantity.setId(id);
txtquantity.setText("0");
txtquantity.setTextSize(20);
final TextView txtprice = new TextView(this);
txtprice.setId(id);
txtprice.setText(citem.getString(citem.getColumnIndex("itemprice")));
txtprice.setTextSize(30);
ImageButton btn1 = new ImageButton(this);
btn1.setId(id);
final int id_ = btn1.getId();
btn1.setImageResource(R.drawable.ic_launcher);
btn1.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
int i = 0;
i=Integer.parseInt((String) txtquantity.getText())+1;
txtquantity.setText(String.valueOf(i));
totalprice.setText(String.valueOf(Integer.parseInt(totalprice.getText().toString())+(Integer.parseInt(txtprice.getText().toString())*1)));
}
});
ImageButton btn2 = new ImageButton(this);
btn2.setId(id);
final int id2_ = btn2.getId();
btn2.setImageResource(R.drawable.ic_launcher);
btn2.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
if(Integer.parseInt((String)txtquantity.getText())<=0)
{
}
else
{
int i=0;
i= Integer.parseInt((String) txtquantity.getText())-1;
txtquantity.setText(String.valueOf(i));
totalprice.setText(String.valueOf(Integer.parseInt(totalprice.getText().toString())-(Integer.parseInt(txtprice.getText().toString())*1)));
}
}
});
linearLayout.addView(iv);
linearLayout.addView(txtprice);
linearLayout.addView(btn1);
linearLayout.addView(txtquantity);
linearLayout.addView(btn2);
mainLayout.addView(linearLayout);
}
mainLayout.addView(totalprice);
mainLayout.addView(border);
scrollView.addView(mainLayout);
setContentView(scrollView);

Not quite sure what problem you're having? If it's just reading all the TextViews you created in the loop, then you should just keep a list, and send it off for processing when you submit...
List<TextView> tv_list = new ArrayList<TextView>();
while(...){
//In loop..add your tv's
TextView some_tv = new TextView()
tv_list.add(some_tv);
...
}
//In the submit, send them off for processing...
private void process_tvs(List<TextView> tv_list){
for(TextView tv:tv_list){
//Assuming your tv's have numbers...
int val = Integer.valueOf(tv.getText().toString());
//do something....
}
}

Dynamic checkboxes adding/deleting to the LinearLayout VS ListView

I have a array which I get from another Activity. I want to display it in the current Activity as CheckBox items and then have ability to check some of them and delete by button clicking. I implement it next way:
public void addFiles()
{
LinearLayout layout = (LinearLayout) findViewById(R.id.filesList);
if(!FileManagerActivity.finalAttachFiles.isEmpty())
{
for (int i=0; i<FileManagerActivity.finalAttachFiles.size();i++)
{
View line = new View(this);
line.setLayoutParams(new LayoutParams(1, LayoutParams.MATCH_PARENT));
line.setBackgroundColor(0xAA345556);
informationView= new CheckBox(this);
informationView.setTextColor(Color.BLACK);
informationView.setTextSize(16);
informationView.setGravity(Gravity.CENTER_VERTICAL | Gravity.CENTER_HORIZONTAL);
informationView.setCompoundDrawablesWithIntrinsicBounds(R.drawable.file_icon, 0, 0, 0);
informationView.setText(FileManagerActivity.finalAttachFiles.get(i).getName().toString());
informationView.setId(i);
layout.addView(informationView, 0);
layout.addView(line, 1);
layout.postInvalidate();
}
}
}
, and call it in the onCreate() method. it can be added successfully. Then I get items which were checked like this:
btnFilesRemove.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
LinearLayout layout = (LinearLayout) findViewById(R.id.filesList);
View v = null;
for(int i=0; i<FileManagerActivity.finalAttachFiles.size(); i++) {
v = layout.getChildAt(i);
CheckBox checkBox = (CheckBox) findViewById(i);
boolean checked=checkBox.isChecked();
if (checked)
{
Log.i("was checked",checkBox.getText().toString());
ViewGroup parent = (ViewGroup) v.getParent();
parent.removeView(v);
FileManagerActivity.finalAttachFiles.remove(i);
Log.i("this is view,baby",v.toString());
}
}
}
});
But items can't be deleted. And I'm thinking - what is better - to implement it in this way or maybe it will be more efficient with ListView using. I mean to create ArrayAdapter e.t.c..

Dynamically add imageView to layout

Every time I go to add an Image view to my Linear Layout dynamically I get a null pointer exception.
LinearLayout tables = (LinearLayout) findViewById(R.id.table);
for(int i = 0; i < data.length; i++){
ImageView image = new ImageView(getApplicationContext());
try{
int imgID = getResources().getIdentifier(data[i], "drawable", "package");
image.setImageResource(imgID);
}catch(Exception e){
int imgID = getResources().getIdentifier("nia", "drawable", "package");
image.setImageResource(imgID);
}
tables.addView(image); //NULL POINTER THROWN HERE
}
When I debug, the imgID has a value, so I know its working. I just don't understand why its null if

If this is the line that causes the Null Pointer Exception:
tables.addView(image);
Then tables is null, simply findViewById() did not find any View with the id R.id.table in the current layout being displayed.
(If you want help figuring out why tables is null, please post the layout which you pass to setContentView())
Added from comments
Here is a general way to create a PopupWindow. This uses a LayoutInflator to inflate the layout so that we can access it to dynamically add elements to the layout. (Notice that we scope find to popupLayout.findViewById(...)):
public class Example extends Activity {
private PopupWindow popupWindow;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
TextView text = (TextView) findViewById(R.id.text);
text.setOnClickListener(new OnClickListener() {
public void onClick(View view) {
createPopup(view);
}
});
}
public void createPopup(View view) {
LayoutInflater layoutInflater = (LayoutInflater) getSystemService(LAYOUT_INFLATER_SERVICE);
View popupLayout = layoutInflater.inflate(R.layout.popup, null);
// Customize popup's layout here
Button dismissButton = (Button) popupLayout.findViewById(R.id.dismiss);
dismissButton.setOnClickListener(new OnClickListener() {
public void onClick(View view) {
popupWindow.dismiss();
}
});
popupWindow = new PopupWindow(popupLayout, LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
popupWindow.showAtLocation(view, Gravity.CENTER, 0, 0);
}
}
Understand that the root element in popup.xml should have a background attribute defined otherwise the window is transparent by default.

to check if there is a problem with your XML layout you can try to define the layout programmatically
LinearLayout tables = new LinearLayout(getApplicationContext());
for(int i = 0; i < data.length; i++){
ImageView image = new ImageView(getApplicationContext());
try{
int imgID = getResources().getIdentifier(data[i], "drawable", "package");
image.setImageResource(imgID);
}catch(Exception e){
int imgID = getResources().getIdentifier("nia", "drawable", "package");
image.setImageResource(imgID);
}
tables.addView(image);
}
And adds this view like a ContentView
setContentView(tables);