Activity Declaration in Androidmanifest.Xml

Activity Declaration in AndroidManifest.xml

You have two activities in your package, but have only declared one in manifest.

Declare the other Activity class:

Add this to your manifest:

<activity
     android:name="com.example.stockquote.StockInfoActivity"
     android:label="@string/app_name" />

declaring an activity in AndroidManifest

Try This

Read doc about Manifest file Manifest file structure

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.brianballz.a1ibsos">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">

        <activity android:name=".MainActivity"
            android:theme="@style/AppTheme">

            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

        </activity>

       <activity android:name=".CreateAccountActivity"></activity>
       <activity android:name=".LoginActivity"></activity>

    </application>

</manifest>

Error: have you declared this activity in your AndroidManifest.xml? when trying to intent a class

You cannot use an Intent to start/create a Fragment much like you would for an Activity. A Fragment actually lives inside an Activity i.e. its lifecycle is bound to an Activity. To start a Fragment you have to use the FragmentManager that is available with the Activity instance

This error is coming up because Android thinks that your InformationFragment is an Activity rather than a Fragment and hence it is asking you if you have declared it in your AndroidManifest.xml file because as the rule says, you need to have each Activity in your app declared inside the AndroidManifest.xml file

So, now you can use something like this, inside your showInfoActivity. Technically there are many solutions available as to what you could essentially do and that's why I linked you to all possible solutions rather than just writing them here

Android Studio says Mainactivity is not declared in AndroidManifest.xml ?

There could be two scenarios.

1) you have your MainActivity.java class but you haven't created activity_main.xml thats why you didn't declared you Activity in your android manifest.

2) You have your both java class and xml class but you didn't declared your activity in android manifest.

NOTE: This issue only occur when you forgot to declare your activity in android manifest.

...have you declared this activity in your AndroidManifest.xml

You have declared this activity outside application tag.

<activity  android:name=".Compte"  android:screenOrientation="portrait" />

Make it like this :

<application
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@android:style/Theme.Light.NoTitleBar" >

    <activity
        android:name=".Menu" 
        android:screenOrientation="portrait"
        android:label="@string/app_name">
        <intent-filter>
             <action android:name="android.intent.action.MAIN" />
             <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>

    </activity>

    <activity  
         android:name=".Compte"  
         android:screenOrientation="portrait" />

</application>

<uses-permission android:name="android.permission.INTERNET"></uses-permission>

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