...Have You Declared This Activity in Your Androidmanifest.Xml

...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>

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: Unable to find explicit activity class but activity already declared in AndroidManifest.xml

Please follow these steps.

1.You should rename ImageView class to something else like ImageViewActivity or any thing.

2.Make sure this activity extends Activity or AppCompatActivity.

3.Make sure this activity is under directory app\src\main.

This should resolve your problem.

Unable to find explicit activity class {...}; have you declared this activity in your AndroidManifest.xml?

Define your second activity in AndroidManifest.xml file like below...

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

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name"
            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=".peri_area_rect"
            android:label="@string/app_name"
            android:theme="@style/AppTheme.NoActionBar"/>
    </application>

</manifest>

Unable to find explicit activity class. Have you declared this activity in your AndroidManifest.xml

declare your activity like this:

<activity
        android:name=".AppPreferenceActivity"
        android:label="Preferences" >
        <intent-filter>
            <action android:name="com.iphonik.chameleon.AppPreferenceActivity" />
            <category android:name="android.intent.category.DEFAULT" />
        </intent-filter>
    </activity>

and use it:

Intent i = new Intent("com.iphonik.chameleon.AppPreferenceActivity");

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