Unable to call other activity as main activity in Android Studio

Question

I wanted to call login_activity (login credentials screen) as main_activity in Android studio.
I have written following code, but when I run the app, it is crashing.
I got to know that we should change the main_acitivity in Android.Manifests.xml file,corrected it, but app still crashing.

    <activity
        android:name=".LoginActivity"
        android:label="My SRIB"
        android:theme="@style/AppTheme.NoActionBar">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity android:name=".MainActivity"></activity>

Post crash error message. also, the manifest file is called AndroidManifest.xml — maciekjanusz
– maciekjanusz, Commented Nov 24, 2016 at 11:52
Logcat: Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.Window$Callback android.view.Window.getCallback()' on a null object reference — Darshan Adakane
– Darshan Adakane, Commented Nov 24, 2016 at 12:39
Got the problem. I was calling findViewById before onCreate method,which I should not do — Darshan Adakane
– Darshan Adakane, Commented Nov 24, 2016 at 12:42

Darshan Adakane · Accepted Answer · 2023-04-01 16:57:38Z

0

Got the problem. I was calling findViewById before onCreate method,which I should not do

answered Apr 1, 2023 at 16:57

Darshan Adakane

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