ActivityNotFoundException: Unable to find explicit activity class

Question

I am trying to start an activity from my main activity. Its not working and driving me nuts. What I have is:

Intent i = new Intent ("net.xxx.View1");  
Context con = this.getBaseContext();  
ComponentName cn = new ComponentName("net.xxx.Mybooks", "BookView");  
i.setComponent(cn);  
Bundle extras = new Bundle();  
ooo             
i.putExtras(extras);
startActivity(i);

Manifest is:  
            android:name="BookView" >
        <intent-filter >
            <action   android:name ="android.intent.action.VIEW" />
            <action   android:name ="net.xxx.View1" />       
            <category android:name ="android.intent.category.DEFAULT" />
        </intent-filter>

What I get is:
*02-03 19:34:47.448: E/AndroidRuntime(2027): android.content.ActivityNotFoundException: Unable to find explicit activity class {net.xxx.Mybooks/BookView}; have you declared this activity in your AndroidManifest.xml *
Which would be correct, I think, if the '/' was a '.'

I tried with context and without any componetName, the result is always the same.

SdkVersion="10"
Thanks in advance for your help
Cliff

I also tried Intent i = new Intent (this, BookView.class); and I get "02-04 14:24:31.750: E/AndroidRuntime(480): java.lang.RuntimeException: Unable to start activity ComponentInfo{net.crl.mybooks/net.crl.mybooks.BookView}: java.lang.NullPointerException" — cliff2310, Feb 04 '12 at 20:27

score 6 · Accepted Answer · answered Feb 05 '12 at 01:31

6

Well despite the clams of activity not found, the problem was in the new activity. It had a null pointer exception in the code. So I spent a day or so chasing the wrong problem.

Thanks for your time anyway

Cliff

answered Feb 05 '12 at 01:31

cliff2310

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score 4 · Answer 2 · answered Feb 04 '12 at 02:07

4

Try putting a "." in front of BookView Try doing something like this in your manifest.

<activity android:name=".BookView" >
    <intent-filter >
        <action   android:name ="android.intent.action.VIEW" />
        <action   android:name ="net.xxx.View1" />       
        <category android:name ="android.intent.category.DEFAULT" />
    </intent-filter>
</activity>

answered Feb 04 '12 at 02:07

CChi

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I tried that. I get the same result, or one that has 'new.xxx.MyBooks/net.xxx...' But thanks for the reply. Cliff – cliff2310 Feb 04 '12 at 18:21

score 1 · Answer 3 · answered Apr 27 '17 at 22:00

1

I have similar problem after refactor my package name, and I finally found that my applicationId value in build.gradle has typo, and Android Studio doesn't give any warning.

answered Apr 27 '17 at 22:00

林果皞

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score 0 · Answer 4 · answered Feb 18 '13 at 00:28

0

I got this problem after I renamed some activities. Make sure you update your AndroidManifest to reflect renaming changes.

answered Feb 18 '13 at 00:28

Rowan Freeman

15,724
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score 0 · Answer 5 · answered Apr 15 '13 at 11:32

0

I also get this when I put Activity-derived class nested in another class, so it can not be found, moving outside solves the problem

answered Apr 15 '13 at 11:32

Phuong

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score 0 · Answer 6 · answered Feb 03 '15 at 15:07

0

Make sure your activity is defined in manifest. I had copy pasted a Activity class and forgotten to add the definition in manifest file and ended up with this problem.

answered Feb 03 '15 at 15:07

Vikram Rao

514
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Yes that would be a problem, but my problem was different. See answer below. – cliff2310 Feb 03 '15 at 23:52

ActivityNotFoundException: Unable to find explicit activity class

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