Using of less than , greater than and equals condition in android studio.

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I have a default value show in a Text View ,as i enter a number in an Edit Text i need a validation saying the Entered number shouldn't be greater than or equal to it, any help here?? So far I've used >= and > but didn't work ......

What I have tried:

Java

@Override
            public void onClick(View v) {
                if (amt.getText().toString().trim().isEmpty()){
                    Toast.makeText(myView.getContext(), "Enter Valid Amount", Toast.LENGTH_LONG).show();
                    //isValidDecimalNumber(amt);
                }
                else if ( (amt.getText().toString().trim().length() >=  txt1.getText().toString().trim().length())){

                }
                else {
                     tot = Double.parseDouble(amt.getText().toString());
                     tt=(tot / 100.0f) * 3+tot;
                    loadProducts2();
                }

            }

Posted 23-Oct-18 0:08am

Member 13818240

Updated 23-Oct-18 22:56pm

v4

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David Crow 23-Oct-18 15:38pm

Have you considered calling setFilters() on the EditText controls? This would allow you to easily control both length and range.

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Richard MacCutchan · Accepted Answer · 2018-10-23T00:59:00

Java

else if ( (amt.getText().toString().trim().length()   txt1.getText().toString().trim().length())){

What are these two lines supposed to be doing?

Once you have checked that there is some text in your textbox, then you should try to convert it. You can then test that it lies within the range of acceptable values. You should also wrap the conversion in a try/catch block to capture invalid input.

[edit]

Java

public void onClick(View v) {
string strAmount = amt.getText().toString().trim();
if (strAmount.isEmpty()){
    Toast.makeText(myView.getContext(), "Enter Valid Amount", Toast.LENGTH_LONG).show();
}
else {
    try {
        tot = Double.parseDouble(strAmount);
        if (tot < 0 || tot > maxAmount) {
            // show invalid number
        }
        tt=(tot / 100.0f) * 3+tot;
        loadProducts2();
    catch (NumberFormatException ne) {
        Toast.makeText(myView.getContext(), strAmount + " is not a valid number", Toast.LENGTH_LONG).show();
    }
}

[/edit]

KarstenK · Accepted Answer · 2018-10-23T04:37:00

Solution 2

You should write clearer code like

C++

public void onClick(View v) {
    String text = amt.getText().toString().trim();

    if (text.isEmpty()){
    } else {
        int value = Double.parseDouble(text);
        // deals with value

This helps a lot in finding better code.

Your else if clause looks very strange. Revisit and rethink that code lines.

Posted 23-Oct-18 4:37am

KarstenK

Comments

Member 13818240 24-Oct-18 4:57am

what you said was correct ,but i don't think so this is the answer for my question

Richard MacCutchan 24-Oct-18 6:30am

See my updated solution above.

Using of less than , greater than and equals condition in android studio.

2 solutions

Solution 1

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