how to prevent app from stopping with EditText (for numbers) is empty?

Question

I'm new in Android development and was trying to make an app with the below code, but once I press the "Score" button, the app crashes. I tried to add a Toast message under the OnClick method for the "Score" button to prevent that, but it seems that I can't retrieve int and String from the same EditText under the onClick method (it keeps closing the app when i do so). The below codes were tried but with no luck. So, can anyone help me with the proper code to prevent the app from crashing when the EditText is blank? I tried the below test code but the problem still the same.

displayScore1.getText().toString().equals("")
displayScore1.getText().toString().matches("")
displayScore1.getText().length() != 0

package com.example.android.test;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import org.w3c.dom.Text;

public class MainActivity extends AppCompatActivity {

    int score1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Button test = (Button)findViewById(R.id.button);
        test.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                EditText displayScore1 = (EditText) findViewById(R.id.score);
                score1 = Integer.parseInt(displayScore1.getText().toString());

                if (!displayScore1.getText().toString().trim().isEmpty()){
                    displayText(score1);
                }
                else{
                    Toast.makeText(MainActivity.this, "Please enter the Number of Tricks", Toast.LENGTH_SHORT).show();
                }
            }
            });
    }

    public void displayText(int message){
        TextView display = (TextView)findViewById(R.id.text);
        display.setText("" + message);
    }


}

score 1 · Answer 1 · answered Feb 03 '17 at 12:33

1

You can use any approach but need be aware of with spaces and new lines. One example is shown below.

if(!displayScore1.getText().toString().trim().isEmpty()){
// edittext has some thing
}else{
//do what you want to do when edittext is empty
}

answered Feb 03 '17 at 12:33

Nayan Srivastava

3,655
3
27
49

Unfortunately, it didn't work. I pasted above a test code that i used to demonstrate what i am doing. Please let me know if i'm missing something in the syntax. – user7440913 Feb 03 '17 at 14:19

score 0 · Answer 2 · answered Feb 03 '17 at 12:31

0

Try like this

 displayScore1.getText().toString().trim().length()==0{
//your code

}

answered Feb 03 '17 at 12:31

Rajakumar

907
1
7
17

Didn't work :( Is it because i can't extract two different values from the same view under the onClick? because if i turn the method to get only String, it works fine. But the thing is, the main type i'm targeting out of this Edittext is Int. – user7440913 Feb 03 '17 at 18:38

how to prevent app from stopping with EditText (for numbers) is empty?

2 Answers2