检查 Edittext 是否为空，如果不是则执行特定任务

Question

I am making an app and I'm stuck with one problem. I want to know what can I do to make this happen:

I want to check if the edit text is empty or not and if it is not, then perform a particular piece of the task and if it is empty then make a toast which says please enter the names.

Here is my code: `

final TextView percentage = (TextView) findViewById(R.id.percentage_text);
Button calculateButton = (Button) findViewById(R.id.calculate_button);

    calculateButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            Random noGen = new Random();
            int number = noGen.nextInt(101);

            EditText firestName = (EditText) findViewById(R.id.first_name);
            String firstNameString = firestName.getEditableText().toString();

            EditText secName = (EditText) findViewById(R.id.sec_name);
            String secNameString = secName.getEditableText().toString();
            percentage.setText(Integer.toString(number));

            Toast.makeText(getApplicationContext(), "The love score between " + firstNameString  +" & " + secNameString + " is "  + number + "%", Toast.LENGTH_SHORT ).show();
        }
    });

`

I know I can easily do this with if else statement but I am not able to do it

Thanks in advance!!!

Answer 1

Try this:

if(firestName.getText()!=null && 
   !firestName.getText().equals("") && secName.getText()!=null && 
   !secName.getText().equals("")){

   // do your task

}else{ 
  // show msg
}

Answer 2

You can check String variable that whether is empty or not. You can refer below code. You can find more String operation on Internet.

Button calculateButton = (Button) findViewById(R.id.calculate_button);
 EditText firestName = (EditText) findViewById(R.id.first_name);
 EditText secName = (EditText) findViewById(R.id.sec_name);

    calculateButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            Random noGen = new Random();
            int number = noGen.nextInt(101);

            String firstNameString = firestName.getEditableText().toString();
            String secNameString = secName.getEditableText().toString();

            if(!firstNameString.isEmpty() && !secNameString.isEmpty()){
                //Perform your task
            }

            percentage.setText(Integer.toString(number));

            Toast.makeText(getApplicationContext(), "The love score between " + firstNameString  +" & " + secNameString + " is "  + number + "%", Toast.LENGTH_SHORT ).show();

        }
    });

Answer 3

Try below code;

 EditText firestName = (EditText) findViewById(R.id.first_name);
 String firstNameString = firestName.getEditableText().toString();

 EditText secName = (EditText) findViewById(R.id.sec_name);
 String secNameString = secName.getEditableText().toString();

 if(firstNameString.matches("") && secNameString.matches("")){
            //Do your code here
 }

Answer 4

if(firestName.getText().toString().equals("")){
  //do some stuff

} else{ Toast.makeText(getApplicationContext(), "Please enter", Toast.LENGTH_SHORT ).show(); } else{ Toast.makeText(getApplicationContext(), "Please enter", Toast.LENGTH_SHORT ).show(); }