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  1. ,
    via Stack Overflow by Rasel

    Your package name in the manifest is as com.google.android.gm and activity name as com.android.mail.compose.ComposeActivity, making a mismatch between the package and activity name. Your activity class name should start with the package name.

Solutions on the web

via Stack Overflow by DroidGalaxy
, 1 year ago
Unable to start activity ComponentInfo{com.firstttttyt.lights/com.firstttyt.lights.MainActivity}: android.content.ActivityNotFoundException: Unable to find explicit activity class {com.firstttyt.lights/com.firstttyt.lights.RestartAlarmsService}; have you declared this activity in your AndroidManifest.xml?
via Stack Overflow by user8045747
, 10 months ago
Unable to start activity ComponentInfo{com.weebly.ahakra.irc/com.weebly.ahakra.irc.MainActivity}: android.content.ActivityNotFoundException: Unable to find explicit activity class {com.weebly.ahakra.irc/com.weebly.ahakra.irc.MyService}; have you declared this activity in your AndroidManifest.xml?
via Stack Overflow by Amal Kronz
, 1 year ago
Unable to start activity ComponentInfo{com.newsolution.jiibli/com.payfort.fort.android.sdk.activities.InitSecureConnectionActivity}: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
via Stack Overflow by Fab
, 8 months ago
Unable to start activity ComponentInfo{com.example.fkoffle.blescanner/com.example.fkoffle.blescanner.ServiceCharacteristicAvtivity}: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
via Stack Overflow by Synnipoe
, 1 year ago
Unable to start activity ComponentInfo{uk.co.willmudgelive.ketimer/uk.co.willmudgelive.ketimer.MainActivity}: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
via GitHub by Witype
, 1 year ago
Unable to start activity ComponentInfo{com.sophpark.upark/com.sophpark.upark.ui.splash.SplashActivity}: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
android.content.ActivityNotFoundException: Unable to find explicit activity class {com.firstttyt.lights/com.firstttyt.lights.RestartAlarmsService}; have you declared this activity in your AndroidManifest.xml?	at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1854)	at android.app.Instrumentation.execStartActivity(Instrumentation.java:1545)	at android.app.Activity.startActivityForResult(Activity.java:4283)	at android.support.v4.app.BaseFragmentActivityJB.startActivityForResult(BaseFragmentActivityJB.java:48)	at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:75)	at android.app.Activity.startActivityForResult(Activity.java:4230)	at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:871)	at android.app.Activity.startActivity(Activity.java:4567)	at android.app.Activity.startActivity(Activity.java:4535)	at com.firstttyt.lights.MainActivity.onCreate(MainActivity.java:59)	at android.app.Activity.performCreate(Activity.java:6876)	at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1135)	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3207)