Java Simple number game App crashes when EditText is empty

android-edittext not allow empty
not blank java

I have made a simple Android app, where the app creates a number between 1 and 20 and the user has to guess it. Everything works fine, except one thing: When I let the EditText empty, the App crashes instantly when I press the Button. How can I prevent that? I tried an if-else Argument at the point where the entered Text of the EditText is given to the global created editText Variable editTextGuess, but then the app crashed instantly after launch.

What do I have to Code, that the app does not crash caused by the empty textfield but creates a toast saying "Oops, your Textfield is empty"?

package com.example.randomness;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

import java.util.Random;

public class MainActivity extends AppCompatActivity {

    //Den EditText und den Integer für die zufällige Zahl global erstellen
    EditText editTextGuess;
    int RandomNumber;

    //Hier einen Void eröffnen, um die zufällige Zahl zu erstellen
    public void generateRandomNumber(){
        Random random = new Random();

        RandomNumber = random.nextInt(20) +1;
    }

    //Erstellen der OnClick Methode für den Button, View view ist wichtig!
    public void guess(View view){
        Log.i("Button clicked", "Worked!");

        int guessValue;
        guessValue = Integer.parseInt(editTextGuess.getText().toString());
        Log.i("Entered Value:", Integer.toString(guessValue));
        Log.i("The random number is:", Integer.toString(RandomNumber));


        String message;

        if(guessValue > RandomNumber){
            message = "Your guessed number is too high!";
        } else if(guessValue < RandomNumber){
            message = "Your guessed number is too low!";
        } else if(guessValue == RandomNumber){
            message = "You were right! Let's play again!";
            generateRandomNumber();
            Log.i("Info", "New random number created");
        } else {
            message = "Something went wrong...";
        }

        Toast.makeText(this, message, Toast.LENGTH_LONG).show();

    }

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

        editTextGuess = findViewById(R.id.editTextRaten);
        generateRandomNumber();

    }
}

Check your edit text string value before assigning it to the variable.

public void guess(View view){
    Log.i("Button clicked", "Worked!");

    int guessValue;
    if(!editTextGuess.getText().toString().equals("")){
        guessValue = Integer.parseInt(editTextGuess.getText().toString());
        Log.i("Entered Value:", Integer.toString(guessValue));
        Log.i("The random number is:", Integer.toString(RandomNumber));


        String message;

        if(guessValue > RandomNumber){
            message = "Your guessed number is too high!";
        } else if(guessValue < RandomNumber){
            message = "Your guessed number is too low!";
        } else if(guessValue == RandomNumber){
            message = "You were right! Let's play again!";
            generateRandomNumber();
            Log.i("Info", "New random number created");
        } else {
            message = "Something went wrong...";
        }

        Toast.makeText(this, message, Toast.LENGTH_LONG).show();
    }  else {
        Toast.makeText(this, "Oops, your Textfield is empty", Toast.LENGTH_LONG).show();
    }

}

Android application crashes when EditText is empty, But if I open my app and it's empty and I click submit, it crashes my app. I am making a bank program in java, I'm trying to generate unique bank account numbers Basic college classes would be a total drag for him now much less in 5 years and have been dabbling in some Unity c# game development for some time. I am having this issue with Edittext in android studio.The app works fine but app crashes with no input. Here is the java code. public void onButtonClick (View v) { int num1,num2,sum; EditText e1 = (EditText)findViewById(R.id.num1); EditText e2 = (EditText)findViewById(R.id.num2); TextView t1 = (TextView)findViewById(R.id.sum); num1 = Integer.parseInt(e1.getText().toString()); num2 = Integer

Before you try to use text from EditText, check if it contains any text or not. If it does, read the text otherwise display a toast

String text = editTextGuess.getText().toString().trim();

if(text.length == 0) {
  // show toast
} else {
  // use text from  editTextGuess
}

Android, When i press add or sub button without entering values app crashes. any value (number value) into Edittext (text field) and value is null or empty string so wrong. In my app I am taking answers from a user for a mathematical game. nfe) { return false; } return true; } Source: How to check if a String is numeric in Java I'm working on an application with some mathematical problems. I made a photo in the photoshop and under the image there is an editText and button. Everything is fine, but when I click the button when editText is empty the application crashes. I tried some solutions, but they did not help me. So if can anyone help me i would be grateful.

It crashes because parseInt() throws a NumberFormatException when it tries to parse an empty string.

How to fix this depends on what you want if the input field is empty.

String value = editTextGuess.getText().toString();
if (!value.isEmpty()) {
    guessValue = Integer.parseInt(value);
    ...
}
else {
    Toast.makeText(this, "Oops, input field is empty", ...);
}

Button pressing causes app crash, Here are a few common MIME types when sending simple data in Android. an intent with action ACTION_SEND in the Sending Simple Data to Other Apps lesson, the UI after receiving the data can be as simple as populating an EditText , or it can The Android Sharesheet shows a fixed number of Direct Share targets. My application crash if the user have empty EditText. Code (Text): Android Apps & Games. Replies: 0 Views: 202. ogola89 May 26, 2020. Bluestacks App Crash.

As the issue has already been pointed out by @Yousaf this answer that will help you move forward but would like to add few things to take care in future to help debugging easier: Always try to create multiple statements where you are dereferencing object like

guessValue = Integer.parseInt(editTextGuess.getText().toString());

can be written as

String text=editTextGuess.getText().toString();
guessValue = Integer.parseInt(text);

It will help you know the exact cause of failure.Like you may encounter NumberFormatException if the entered string is not number.

Receiving simple data from other apps, Supporting game controllers After you have installed the test autofill service from the sample app, The following example sets a "password" hint on an EditText : If using separate views for different parts of a phone number, you can context.getSystemService(AutofillManager::class.java) } else { null } Set app:counterEnabled to true and app:counterMaxLength with the maximum number of characters you want in the TextInputLayout. Character Counter is by default displayed below the EditText (bottom-right) and while writing this tutorial, there’s no way to change the position, yet.

Optimize your app for autofill, (These practicals will not explain object-oriented programming or the Java language.) This simple app displays the string "Hello World" on the screen of the Android uses the screen density, that is, the number of pixels per inch to determine the The default "Hello World" TextView element that is created by the Empty� Note: By the way, to make the guessing game harder or easier, simply change the number inside of the parenthesis of the Random variable we created. You can change it from 1000 to 10 so it creates a number from 1 to 10, or you can make the number larger. Have fun! **Editor's Note: The game actually picks a number between 0 and 999, not 1 and 1000.

[PDF] Android Developer Fundamentals Course – Practicals, To create a blank Fragment , expand app > java in Project: Android view, select the game might track readings from a device's accelerometer sensor to infer Lines without letter/number codes are virtual or composite sensors, that is, If your app crashes with the images provided for the sample app, you may need to use. Step3: Working with Java file. Open the MainActivity.java file there within the class, make a method named doSum(View v). In this method, first of all, we have to link two edit box with variables so that we can use them for our input. So link those edit box with variables we have write "EditText e1=(EditText )findViewById(R.id.num1);"

[PDF] Advanced Android Development Course- Practicals, app-debug.apk is crashing while i install it manually on my android device OnClickListener{ Button Pricebutton, MaxCostbutton; EditText num1, num2, num3 , num4; parseFloat(Float.java:459) at com.example.salescalculator. You don' t make any checks wether the input is empty or not a number what you should do � This sample app demonstrates how to use the Cookie API. It contains storage and retrieval of values using both, the Android Framework API and the InstantApps Play Services API. Usage This API is available to both, the Instant App as well as the Installed App, and allows to migrate user-generated data from an instant app to an installed app.

Comments
  • Perfect, It worked! I changed your if(!editTextGuess.getText().toString().equals("")){ to if(editTextGuess.getText().toString().length() > 0){ but you really helped me!
  • editTextGuess.getText().toString().length() will return 1 if you enter a blank space in EditText. So I will suggest the !equals("") approach.
  • I used a just-numbers editText, so you can not enter black spaces. But thanks for your answer, I will keep that in mind for future!