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Dynamically creating Buttons and setting onClickListener
(9 answers)
Closed 4 years ago.
I am developing an android attendance system in which the user enters the total number(int) of students in a class in Main_Activity and that many numbers of buttons are created in 2nd activity. How can I use the user input to create a list of buttons (used to mark present or absent) during runtime.
Code to save Int value
EditText total_roll_Name = (EditText) findViewById(R.id.roll_total_input);
String total_roll_text = total_roll_Name.getText().toString();
i.putExtra("totalRoll", total_roll_text);
Create button run time by below code and add into linear layout
Button dButton= new Button(this);
myButton.setText("Add Me");
LinearLayout lay= (LinearLayout)findViewById(R.id.buttonlayout);
LayoutParams layPar= new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
lay.addView(dButton, layPar);
i think you need attendance module right?.you have all student roll no in database.if you have then get a data from database in custom listview with checkbox and you can easily mark or unmark present or not.i already developed this type of system.if you need then i send you.
Related
I am trying to interact with dynamically generated buttons. I want to update text and background color for those player clicked and for those who is near by horizontal or vertical axis at the moment of a click.
What I've tried. I've found an id property of a button in XML which led me to idea that I can make a text key to refer to a programmatically generated button. But when I've tried to assign an id - IDE was expecting a number (Int), not a string. Since buttons form a square array - I decided to encode each button via 4 digit number where first 2 digits stand for a row number and other two stand for a column number. Though when I tried to use findViewById IDE told me that it was expecting a special id data type, not a number.
That's how it looks for now:
for (i in 1..size) {
for (j in 1..size){
val button = Button(this)
button.id = i*100 + j
constraintLayout.addView(button)
}
}
What idea or method could I look at?
If you created it dynamically you can save it in a variable (or an array) for later use.
val myButtons = ArrayList<Button>()
for (i in 1..size) {
for (j in 1..size){
val button = Button(this)
myButtons.add(button)
constraintLayout.addView(button)
}
}
if you have a layout with dynamically created views and you know their order you can get them with getChildAt(index).
Alternatively you can assign ids saved in xml like this.
As shown in image, I have added the same fragment 5 times in activity by performing on click operation on ADD FRAGMENT button:
Now I want to get all user entered data from those 5 edittext on click of GET DATA button. Is this possible?
(Both buttons is in Main Activity)
First we need to traverse to the dynamic edit text linear layout and then only we can count how many edit texts are avaliable then read the values of corresponding edit text :)
//step:1
LinearLayout layout = (LinearLayout)findViewById(R.id.LinearDynamicEditTextID);// change as your //dynamic EditTexts' parent Linear Layout id.
//step:2
for(int i=0;i<layout.getChildCount();i++)// Count how many children avaliable
{
View v = (View)layout.getChildAt(i);// get the child view
if (v instanceof EditText)// verifying whether the child is EditText for secure.
{
EditText editText = (EditText)layout.getChildAt(i);//thats it.
Log.w("Edit Text "+i+" Value" , editText.getText());
}
}
Now I want to get all user entered data from those 5 edittext on click
of GET DATA button. Is this possible?
Answer: Yes, this is possible.
How?
Solution: You can make public variables in the activity and you can access those variables from the fragment which you are adding. On click of GET DATA button, you can read those variables set by the different fragment and show them in the same Activity or in different Fragment.
I want to read data from the sqlite database in android studio and show them using TextView in a different activity say activity 2. So in first activity i will fill details and click submit button and on clicking the activity 2 will open and will show all the details that i inserted in activity 1 in textview.
this is a example.
String dataOne;
for(int i=0; i < mListData.size();i++){
dataOne = mListData.get(0).getName();
}
text_view.setText(dataOne);
This is the similar example what you are trying to achieve. below is the link
https://www.simplifiedcoding.net/how-to-fetch-data-from-sqlite-database-in-android/
thing is, if i click a button GETDATA - then a new activity starts new.java and i want it to display the contents of my database.
in this new.java i have strings name and id. and i have lined database and this class, such that name and id have the corresponding details that i want to display.
now the ques is, how to display them ?
if i have a
EditText ta;
ta=findViewBy(R.id.edittext1);
ta.setText(name);
should this work ?
it isnt working. also, i dont want user to change the contents and want to make this filed un-editable.
should i use
TextView tf;
ta=findViewBy(R.id.textview1);
tf.setText(name);
?
even this isnt happening.
what is the procedure for this ?
it is done by using append.
TextView ta;
ta=(TextEdit)findViewById(Ri.id.textView1);
String a=getData(1); // goto database, id is 1
ta.append(a);
In my Application I want to Add and Remove View (like Button, or Textview, Checkbox ) by Coding (Programming ).
In Details:
I have One EditText and One Add Button. User Enter Anything in EditText and Press the Add Button then this one is added in bellow LinearLayout, and whether User click on his/her added Button it will going to next LinearLayout.
I get sucess upto this.
but when user click the button in second LinearLayout then it will come back on first Linearlayout. I am getting error Here, i don't know where I made a Mistake.
And I also facing Problem about how can I Store this all. Like User Add 5 Button and closed the application and whenever he/she came back to application I need whatever he/she previously added.
Here is what i done.
http://dynamicandroidview.blogspot.com/2011/12/how-to-add-view-in-android-by-coding.html
Try to create a database table with minimum 2 columns in your case it will be id and buttonText.
Now when user clicks on the add button it will save text to the database and will create the button dynamically below any buttons which are already created before or as a new button.
Now in your onCreate method get the count of text thats stored in database.Some thing like the following code:
DB getData = DB.getInstance();
getData.open(this);
ArrayList<TextHolder> getList = new ArrayList<TextHolder>();
getList = getData.getAllTextFromGeT();
getData.close();
x = genList.size();
Here x will be the number/count of elements that are already stored in the database.Now you can another int say i and using this i and x in the for loop you can create buttons dynamically.
Inside the loop you can do something like the following to get text for all the buttons that are being created:
TextHolder firstOne = getList.get(i);
String text = firstOne.getText();
You will also need class with getters and setters method in order to convert DB elements into objects.Like in the above code getText() is our getter method which is getting elements from database and returning it here.
here text will be the text of the button.
So every-time users starts the application he will see all the buttons that he created when he ran the application before and newly added button will appear on the spot and also will be stored in the database for future retrieval.
Remember we are just storing text of the button and assigning it unique id which helps us to create the buttons.Hope this helps