Android simple login screen crashes app when logging, no errors in eclipse. Which java class activity is at fault?

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package com.android.drinksonme;

import android.app.Activity;

import android.content.Intent;
import android.util.Log;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class Screen2 extends Activity {

    // Declare our Views, so we can access them later
    private EditText etUsername;
    private EditText etPassword;
    private Button btnLogin;
    //private Button btnSignUp;
    private TextView lblResult;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        // Get the EditText and Button References
                etUsername = (EditText)findViewById(R.id.username);
                etPassword = (EditText)findViewById(R.id.password);
                btnLogin = (Button)findViewById(R.id.login_button);
               // btnSignUp = (Button)findViewById(R.id.signup_button);
                lblResult = (TextView)findViewById(R.id.result);

                       btnLogin.setOnClickListener(new OnClickListener() {
                           @Override
                           public void onClick(View v) {
                            String username = etUsername.getText().toString();
                            String password = etPassword.getText().toString();

                           if(username.equals("test") && password.equals("test")){
                               Intent i = new Intent(Screen2.this, DrinksTwitter.class);
                               startActivity(i);
                           } else {
                               lblResult.setText("Invalid username or password."); 
                           } 
                         }
                       });
    }
}
                         /*  final Intent k = new Intent(Screen2.this, SignUp.class);
                           btnSignUp.setOnClickListener(new OnClickListener() {
                               public void onClick(View v) { 
                                   startActivity(k);
                               }*/

This is the log trace:

12-29 17:55:50.215: WARN/KeyCharacterMap(276): No keyboard for id 0
12-29 17:55:50.215: WARN/KeyCharacterMap(276): Using default keymap: /system/usr/keychars/qwerty.kcm.bin
12-29 17:55:56.645: DEBUG/dalvikvm(120): GC_FOR_MALLOC freed 1585 objects / 216672 bytes in 77ms
12-29 17:55:57.615: DEBUG/dalvikvm(120): GC_EXTERNAL_ALLOC freed 1934 objects / 132912 bytes in 74ms
12-29 17:55:59.136: WARN/KeyCharacterMap(120): No keyboard for id 0
12-29 17:55:59.165: WARN/KeyCharacterMap(120): Using default keymap: /system/usr/keychars/qwerty.kcm.bin
12-29 17:56:03.435: INFO/ActivityManager(58): Starting activity: Intent { cmp=com.android.drinksonme/.DrinksTwitter }
12-29 17:56:03.965: DEBUG/AndroidRuntime(276): Shutting down VM
12-29 17:56:03.965: WARN/dalvikvm(276): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
12-29 17:56:04.335: ERROR/AndroidRuntime(276): FATAL EXCEPTION: main
12-29 17:56:04.335: ERROR/AndroidRuntime(276): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.android.drinksonme/com.android.drinksonme.DrinksTwitter}: java.lang.NullPointerException
12-29 17:56:04.335: ERROR/AndroidRuntime(276):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
12-29 17:56:04.335: ERROR/AndroidRuntime(276):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
12-29 17:56:04.335: ERROR/AndroidRuntime(276):     at android.app.ActivityThread.access$2300(ActivityThread.java:125)
12-29 17:56:04.335: ERROR/AndroidRuntime(276):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
12-29 17:56:04.335: ERROR/AndroidRuntime(276):     at android.os.Handler.dispatchMessage(Handler.java:99)
12-29 17:56:04.335: ERROR/AndroidRuntime(276):     at android.os.Looper.loop(Looper.java:123)
12-29 17:56:04.335: ERROR/AndroidRuntime(276):     at android.app.ActivityThread.main(ActivityThread.java:4627)
12-29 17:56:04.335: ERROR/AndroidRuntime(276):     at java.lang.reflect.Method.invokeNative(Native Method)
12-29 17:56:04.335: ERROR/AndroidRuntime(276):     at java.lang.reflect.Method.invoke(Method.java:521)
12-29 17:56:04.335: ERROR/AndroidRuntime(276):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
12-29 17:56:04.335: ERROR/AndroidRuntime(276):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
12-29 17:56:04.335: ERROR/AndroidRuntime(276):     at dalvik.system.NativeStart.main(Native Method)
12-29 17:56:04.335: ERROR/AndroidRuntime(276): Caused by: java.lang.NullPointerException
12-29 17:56:04.335: ERROR/AndroidRuntime(276):     at com.android.drinksonme.DrinksTwitter.onCreate(DrinksTwitter.java:24)
12-29 17:56:04.335: ERROR/AndroidRuntime(276):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
12-29 17:56:04.335: ERROR/AndroidRuntime(276):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
12-29 17:56:04.335: ERROR/AndroidRuntime(276):     ... 11 more
12-29 17:56:04.415: WARN/ActivityManager(58):   Force finishing activity com.android.drinksonme/.DrinksTwitter
12-29 17:56:04.435: WARN/ActivityManager(58):   Force finishing activity com.android.drinksonme/.Screen2
12-29 17:56:04.975: WARN/ActivityManager(58): Activity pause timeout for HistoryRecord{43f9f0c8 com.android.drinksonme/.DrinksTwitter}
12-29 17:56:05.045: INFO/ARMAssembler(58): generated scanline__00000077:03515104_00000000_00000000 [ 33 ipp] (47 ins) at [0x340c68:0x340d24] in 4299931 ns
12-29 17:56:15.909: WARN/ActivityManager(58): Activity destroy timeout for HistoryRecord{43f470c8 com.android.drinksonme/.Screen2}
12-29 17:56:15.909: WARN/ActivityManager(58): Activity destroy timeout for HistoryRecord{43f9f0c8 com.android.drinksonme/.DrinksTwitter}

Snippet from DrinksTwitter.java: @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.specials);

        WebView mWebView = (WebView) findViewById(R.id.drinks);

/line:24/ mWebView.getSettings().setJavaScriptEnabled(true); mWebView.loadUrl("http://www.yahoo.com"); }

12-29 17:56:04.335: ERROR/AndroidRuntime(276): Caused by: java.lang.NullPointerException
12-29 17:56:04.335: ERROR/AndroidRuntime(276):     at com.android.drinksonme.DrinksTwitter.onCreate(DrinksTwitter.java:24)

This is where the NullPointerException is being thrown that's crashing your app. What's line 24 of DrinksTwitter.java?

Detect and diagnose crashes, Android simple login screen crashes app when logging, no errors in eclipse. Which java class activity is at fault? OnClickListener; import android.widget. Button� Android - Login Screen - A login application is the screen asking your credentials to login to some particular application. You might have seen it when logging into facebook,twitter e.t

Try replacing setContentView(R.layout.main) with setContentView(R.layout.activity_screen2). Or there might some kind of error in your DrinksTwitter activity.

Build an Android App Using Firebase and the App Engine Flexible , An app that is written using Java or Kotlin crashes if it throws an unhandled exception, represented by the Throwable class. An app that is� Part-I: Android Simple Login App Front End. We will start with designing our Login Activity for our Android Simple Login App. Go to app -> res -> layout -> activity_login.xml. Pick 5 large text elements, 1 person name element, 1 Button and 1 password element from palette. Arrange it as shown in the image below: Change the text and id as below:

You should try to validate the WebView then call it's methods

if(mWebView != null){
    mWebView.getSettings().setJavaScriptEnabled(true); 
    mWebView.loadUrl("http://www.yahoo.com"); 
}

Also make sure that R.id.drinks is present on your layout file and that the id is correct

    <WebView android:id="@+id/drinks"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"/>

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Fix list for IBM Engineering Systems Design Rhapsody, java - OpenMap not Working in Android - LavOzs.Com. this is Main Activity which override method on-create.On created Android simple login screen crashes app when logging, no errors in eclipse. Which java class activity is at fault? How do I get a button to play a sound from raw when click? I just created a button with id button1, but whatever code I write, all is wrong.. import android.media.MediaPlayer; public class BasicScreenActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_basic_screen); } Button one

Complete JDK 8 Release Notes, Do you have logs, traces, or messages that are related to the problem? DiffMerge not launched correctly from RTC Eclipse client with Rhapsody Plugin Sample in Rhapsody V8.0.5 32 bit results in Cannot created Java interface error Rhapsody in RTC crashes when an element highlighted in Search window is deleted. Almost in every app, you have the Login screen for the user to enter the credentials. In most cases, the Login Activity referred to the welcome screen or user first screen for Application. In this article, we’re going to make a Login screen for Android App. To create a Login screen, I’m going to take this design from the dribble.

Comments
  • The stack trace tells you that you have a NullPointerExcpetion in DrinksTwitter.java line 24 (in onCreate()). What is on that line?
  • I notice you are not doing any error checking after getting the controls for the username and password. At the very least you should check for a null there. Best bet would be to set a breakpoint in OnCreate and step through until you find your culprit.
  • i have included line 24 above
  • @Falmarri if you don't know to help, that is ok with me. You haven't extended any coding help since i have been a member posting on this site. Please ignore my post if you don't have any fix suggestions. This is clearly my first time using LogCat and I have been Android programming for week and i think i am of to a good start.
  • i have included line 24 from DrinksOnMe.java above
  • It's obvious - you do a search by ID for a WebView, but you don't check for the possibility that it won't be found at the next line. If there's no WebView by that name, the reference webView will be null.
  • @duffymo you were absolutely right, thank you for the help :-) I will keep trying, this is very interesting to me.
  • @AndroidNewb: I'd delete that comment you made above to Falmarri. He's absolutely right: you shouldn't be coming here with every stack trace you encounter simply because you're unwilling to read the text in front of you.
  • @AndroidNewb: Does specials.xml have a WebView with the id "drinks"?