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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.

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via Stack Overflow by user3801134
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Could not execute method for android:onClick
android.content.ActivityNotFoundException: Unable to find explicit activity class {com.example.unholyalliance.infinitestream/com.example.unholyalliance.infinitestream.Host}; have you declared this activity in your AndroidManifest.xml?	at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1633)	at android.app.Instrumentation.execStartActivity(Instrumentation.java:1425)	at android.app.Activity.startActivityForResult(Activity.java:3370)	at android.app.Activity.startActivityForResult(Activity.java:3331)	at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:843)	at android.app.Activity.startActivity(Activity.java:3566)	at android.app.Activity.startActivity(Activity.java:3534)	at com.example.unholyalliance.infinitestream.MainActivity.host(MainActivity.java:23)	at java.lang.reflect.Method.invokeNative(Native Method)	at java.lang.reflect.Method.invoke(Method.java:511)	at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288)	at android.view.View.performClick(View.java:4278)	at android.view.View$PerformClick.run(View.java:17429)	at android.os.Handler.handleCallback(Handler.java:725)	at android.os.Handler.dispatchMessage(Handler.java:92)	at android.os.Looper.loop(Looper.java:137)	at android.app.ActivityThread.main(ActivityThread.java:5099)	at java.lang.reflect.Method.invokeNative(Native Method)	at java.lang.reflect.Method.invoke(Method.java:511)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:803)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:570)	at dalvik.system.NativeStart.main(Native Method)