Reputation: 27

App is crashing while switching activitys, build is complete, no error

My app is crashing while switching from the after login activity to the in app´s profile activity. Build is complete without errors.

Any ideas why? (Thankful for every Help)

////////////////////////////////////////////////////////////////////////// ProfileActivity ---->

package com.smarthelp.smarthelp;

import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.ImageButton;

import com.google.firebase.auth.FirebaseAuth;

public class ProfileActivity extends AppCompatActivity {

    private FirebaseAuth firebaseAuth;
    private Button logout;

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

    firebaseAuth= FirebaseAuth.getInstance();

    logout = (Button)findViewById(R.id.btnLogout);

    logout.setOnClickListener(new View.OnClickListener() {
        @Override
            public void onClick(View v) {
                Logout();
            }
        });

        configureibtnHelp();

    }


    private void Logout(){
        firebaseAuth.signOut();
        finish();
        startActivity(new Intent(ProfileActivity.this, LoginActivity.class));

    }
    private void configureibtnHelp() {
        ImageButton ibtnHelp = (ImageButton) findViewById(R.id.ibtnHelp);
        ibtnHelp.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                finish();
            }
        });

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.profile_menu, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {

        switch(item.getItemId()){
            case R.id.logoutMenu:{
                Logout();

            }
        }
        return super.onOptionsItemSelected(item);
    }


}

/////////////////////////////////////////////////////////////////////// HelpActivity ---->

package com.smarthelp.smarthelp;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageButton;

import com.google.firebase.auth.FirebaseAuth;

public class HelpActivity extends AppCompatActivity {

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


        configureibtnProfile();
    }

    private void configureibtnProfile(){
        ImageButton ibtnProfile = (ImageButton) findViewById(R.id.ibtnProfile);
        ibtnProfile.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                startActivity(new Intent(HelpActivity.this, ProfileActivity.class));
            }
        });
    }

}

////////////////////////////////////////////////////////////////////////////// activity_help.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".HelpActivity">

    <ImageButton
        android:id="@+id/ibtnProfile"
        android:layout_width="51dp"
        android:layout_height="52dp"
        android:layout_marginBottom="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginLeft="8dp"
        android:layout_marginRight="8dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:contentDescription="ProfilButton"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.025"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.983"
        app:srcCompat="@drawable/profil" />

    <ImageButton
        android:id="@+id/ibtnOrder"
        android:layout_width="52dp"
        android:layout_height="52dp"
        android:layout_marginBottom="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginLeft="8dp"
        android:layout_marginRight="8dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:contentDescription="OrderButton"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.983"
        app:srcCompat="@drawable/order" />

    <ImageButton
        android:id="@+id/ibtnHelp"
        android:layout_width="51dp"
        android:layout_height="53dp"
        android:layout_marginBottom="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginLeft="236dp"
        android:layout_marginRight="8dp"
        android:layout_marginStart="236dp"
        android:layout_marginTop="8dp"
        android:contentDescription="HelpButton"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.875"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.983"
        app:srcCompat="@drawable/help" />
</android.support.constraint.ConstraintLayout>

/////////////////////////////////////////////////////////////////////////////// ------->Logcat

08-13 19:13:15.273 21068-21068/com.smarthelp.smarthelp E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.smarthelp.smarthelp, PID: 21068
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.smarthelp.smarthelp/com.smarthelp.smarthelp.ProfileActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ImageButton.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2913)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3048)
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loop(Looper.java:193)
        at android.app.ActivityThread.main(ActivityThread.java:6669)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
     Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ImageButton.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
        at com.smarthelp.smarthelp.ProfileActivity.configureibtnHelp(ProfileActivity.java:48)
        at com.smarthelp.smarthelp.ProfileActivity.onCreate(ProfileActivity.java:35)
        at android.app.Activity.performCreate(Activity.java:7136)
        at android.app.Activity.performCreate(Activity.java:7127)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1271)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2893)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3048) 
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78) 
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108) 
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808) 
        at android.os.Handler.dispatchMessage(Handler.java:106) 
        at android.os.Looper.loop(Looper.java:193) 
        at android.app.ActivityThread.main(ActivityThread.java:6669)

Upvotes: 0

Answers (3)

Abhinandan

Reputation: 128

From the crash log it seems

Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference

there is an NPE on the button for which you are trying to set onclick listener. In your ProfileActivity set the button to one of the ImageButtons of XML Assuming you are trying to do for first of your image buttons

just add the following line before setting onClickListener

logout=(Button) findViewById(R.id.ibtnProfile);

Upvotes: 2

Actine

Reputation: 2917

It's pretty much said in the stacktrace: trying to call addOnClickListener on a null object at ProfileActivity on line 27

You haven't initialized logout button with any value. Probably forgot to findViewById it.

Upvotes: 0

Vns Aditya

Reputation: 445

Change

firebaseAuth.getInstance();

FirebaseAuth.getInstance();

at line 14 in ProfileActivity.java

Upvotes: 0

App is crashing while switching activitys, build is complete, no error

Answers (3)

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