Question

I have a Button that adds a row with an EditText to a TableLayout. I need to find out the input in each EditText of the rows that are added.

For example: Someone adds 3 rows, meaning there are 3 EditText. In each EditText, they put the number 3. I need to store the values of the EditText that were added to the layout and add them all up by the click of a button.

Would I use a list then iterate that list? I’m not sure about how I would do this.

This is my code so far…

int count = 1;

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);       
    setContentView(R.layout.activity_main);
    getSavedState();

    Button buttonAdd = (Button) findViewById(R.id.button1);
    Button buttonDel = (Button) findViewById(R.id.button2);
    Button buttonCalc = (Button) findViewById(R.id.button3);
    buttonAdd.setOnClickListener(this);
    buttonDel.setOnClickListener(this);
}

public void onClick(View v) {
    TableLayout tableLayout1 = (TableLayout) findViewById(R.id.tableLayout1);
    List<EditText> allEd = new ArrayList<EditText>();

    switch(v.getId()){
        case R.id.button1:
            if(count != 16){
                count++;

                // Create the row only when the add button is clicked
                TableRow tempRow = new TableRow(MainActivity.this);
                EditText tempText1 = new EditText(MainActivity.this);
                EditText tempText2 = new EditText(MainActivity.this);
                TextView tempTextView = new TextView(MainActivity.this);
                EditText editText1 = (EditText) findViewById(R.id.editText1);
                EditText editText2 = (EditText) findViewById(R.id.editText2);
                TextView textView3 = (TextView) findViewById(R.id.textView3);
                tempTextView.setText(count + ".");

                tempRow.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));
                tempText1.setLayoutParams(editText1.getLayoutParams());
                tempText2.setLayoutParams(editText2.getLayoutParams());
                tempTextView.setLayoutParams(textView3.getLayoutParams());
                tempText1.setInputType(InputType.TYPE_CLASS_TEXT);
                tempText2.setInputType(InputType.TYPE_CLASS_NUMBER | InputType.TYPE_NUMBER_FLAG_DECIMAL);
                tempText2.setId(count);
                allEd.add(tempText2);

                tempRow.addView(tempTextView);
                tempRow.addView(tempText1);
                tempRow.addView(tempText2);
                tableLayout1.addView(tempRow);
            } 
            else {
                final AlertDialog alertDialog = new AlertDialog.Builder(MainActivity.this).create(); //Read Update
                alertDialog.setTitle("Error");
                alertDialog.setMessage("You can only have 10 rows!");

                alertDialog.setButton("Ok", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        alertDialog.dismiss();
                    }
                });

                alertDialog.show();
            }
            break;
        case R.id.button2:
            if(count != 1){
                count--;
                tableLayout1.removeView(tableLayout1.getChildAt(count));
        } 
            else {
                final AlertDialog alertDialog = new AlertDialog.Builder(MainActivity.this).create(); //Read Update
                alertDialog.setTitle("Error");
                alertDialog.setMessage("You must have at least one row!");

                alertDialog.setButton("Ok", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        alertDialog.dismiss();
                    }
                });

                alertDialog.show();
            }
            break;
        case R.id.button3:
            String[] strings = new String[allEd.size()];
            for(int i = 0; i < allEd.size(); i++) {
                strings[i] = allEd.get(i).getText().toString();
                int input = Integer.parseInt(strings[i]);

                final AlertDialog alertDialog = new AlertDialog.Builder(MainActivity.this).create(); //Read Update
                alertDialog.setTitle("Your calculated GPA");
                alertDialog.setMessage("Your calculated GPA is: " + input/count);
                alertDialog.setButton("Ok", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        alertDialog.dismiss();
                    }
                });

                alertDialog.show();
            }
        break;

    }

Answer 1

When you create each of the EditTexts, you need to to add them to an array-like container, such as an ArrayList<EditText>. Whenever you need to access any of these dynamic EditTexts, you can retrieve them from the ArrayList.

I can see that you are already creating an ArrayList<EditText> in your onClick() method. That’s great, but you need to move the ArrayList outside the onClick() method so that you can reference it from any other methods you create. So move this line…

List<EditText> allEd = new ArrayList<EditText>();

outside the method, so that the beginning few lines of onClick() now look like this…

List<EditText> allEd = new ArrayList<EditText>();

public void onClick(View v) {
    TableLayout tableLayout1 = (TableLayout) findViewById(R.id.tableLayout1);

    switch(v.getId()){
    case R.id.button1:

Also, make sure you’re adding all the EditTexts to the ArrayList – I see there is a line allEd.add(tempText2); but I can’t see any line for allEd.add(tempText1); – if you need to access tempText1, make sure you add it to the list.

To perform the ‘adding’ caluclation, you need to loop over the entries in the ArrayList, get their values, then add them together. Something like this…

case R.id.button3:
    // calculate the value first
    int calculation = 0;
    for (int i=0;i<allEd.size();i++){
        // get the entry
        EditText textField = addEd.get(i);

        try {
            // get the value, as a number
            int numberValue = Integer.parseInt(textField.getText());
            // add it to the calculation
            calculation += numberValue;
        } 
        catch (Exception e){
            // ignore errors if the input is empty or isn't a number
        }
    }

    // now display the result
    final AlertDialog alertDialog = new AlertDialog.Builder(MainActivity.this).create();
    alertDialog.setTitle("Your calculated GPA");
    alertDialog.setMessage("Your calculated GPA is: " + input/count);
    alertDialog.setButton("Ok", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int which) {
            alertDialog.dismiss();
        }
    });

    alertDialog.show();
break;