Android - java.lang.SecurityException: Permission Denial: starting Intent

Question

I have a library (jar) on build path of my project. The project accesses the MainActivity in the jar, using the following intent:

final Intent it = new Intent();
it.setClassName("com.example.lib", "com.example.lib.MainActivity");
startActivity(it);

It used to work for sometime, but suddenly started getting 'ActivityNotFoundException: No Activity found to handle Intent' which I was able to resolve. But now I am stuck with a 'java.lang.SecurityException: Permission Denial: starting Intent'.

I have tried all suggestions made on stackoverflow (check for duplicates in manifest file; add android:exported="true" to lib manifest; Eclipse> Project> Clean; adding/ modifying 'intent-filter' tags; etc.). I even tried re-writing the manifest of the project but not going anywhere with it.

Here's the logcat output:

11-07 06:20:52.176: E/AndroidRuntime(4626): FATAL EXCEPTION: main
11-07 06:20:52.176: E/AndroidRuntime(4626): java.lang.SecurityException: Permission     Denial: starting Intent { cmp=com.example.lib/.MainActivity } from ProcessRecord{40dd3778     4626:com.example.project/u0a10046} (pid=4626, uid=10046) not exported from uid 10047
11-07 06:20:52.176: E/AndroidRuntime(4626):     at android.os.Parcel.readException(Parcel.java:1425)
11-07 06:20:52.176: E/AndroidRuntime(4626):     at android.os.Parcel.readException(Parcel.java:1379)
11-07 06:20:52.176: E/AndroidRuntime(4626):     at android.app.ActivityManagerProxy.startActivity(ActivityManagerNative.java:1885)
11-07 06:20:52.176: E/AndroidRuntime(4626):     at android.app.Instrumentation.execStartActivity(Instrumentation.java:1412)
11-07 06:20:52.176: E/AndroidRuntime(4626):     at android.app.Activity.startActivityForResult(Activity.java:3370)
11-07 06:20:52.176: E/AndroidRuntime(4626):     at android.app.Activity.startActivityForResult(Activity.java:3331)
11-07 06:20:52.176: E/AndroidRuntime(4626):     at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:824)
11-07 06:20:52.176: E/AndroidRuntime(4626):     at android.app.Activity.startActivity(Activity.java:3566)
11-07 06:20:52.176: E/AndroidRuntime(4626):     at android.app.Activity.startActivity(Activity.java:3534)
11-07 06:20:52.176: E/AndroidRuntime(4626):     at com.example.project.MainActivity.onOptionsItemSelected(MainActivity.java:93)
11-07 06:20:52.176: E/AndroidRuntime(4626):     at android.app.Activity.onMenuItemSelected(Activity.java:2548)
11-07 06:20:52.176: E/AndroidRuntime(4626):     at android.support.v4.app.FragmentActivity.onMenuItemSelected(FragmentActivity.java:366)
11-07 06:20:52.176: E/AndroidRuntime(4626):     at com.android.internal.policy.impl.PhoneWindow.onMenuItemSelected(PhoneWindow.java:980)
11-07 06:20:52.176: E/AndroidRuntime(4626):     at com.android.internal.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:735)
11-07 06:20:52.176: E/AndroidRuntime(4626):     at com.android.internal.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:149)
11-07 06:20:52.176: E/AndroidRuntime(4626):     at com.android.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:874)
11-07 06:20:52.176: E/AndroidRuntime(4626):     at com.android.internal.view.menu.ActionMenuView.invokeItem(ActionMenuView.java:547)
11-07 06:20:52.176: E/AndroidRuntime(4626):     at com.android.internal.view.menu.ActionMenuItemView.onClick(ActionMenuItemView.java:115)
11-07 06:20:52.176: E/AndroidRuntime(4626):     at android.view.View.performClick(View.java:4204)
11-07 06:20:52.176: E/AndroidRuntime(4626):     at android.view.View$PerformClick.run(View.java:17355)
11-07 06:20:52.176: E/AndroidRuntime(4626):     at android.os.Handler.handleCallback(Handler.java:725)
11-07 06:20:52.176: E/AndroidRuntime(4626):     at android.os.Handler.dispatchMessage(Handler.java:92)
11-07 06:20:52.176: E/AndroidRuntime(4626):     at android.os.Looper.loop(Looper.java:137)
11-07 06:20:52.176: E/AndroidRuntime(4626):     at android.app.ActivityThread.main(ActivityThread.java:5041)
11-07 06:20:52.176: E/AndroidRuntime(4626):     at java.lang.reflect.Method.invokeNative(Native Method)
11-07 06:20:52.176: E/AndroidRuntime(4626):     at java.lang.reflect.Method.invoke(Method.java:511)
11-07 06:20:52.176: E/AndroidRuntime(4626):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 
11-07 06:20:52.176: E/AndroidRuntime(4626):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
11-07 06:20:52.176: E/AndroidRuntime(4626):     at dalvik.system.NativeStart.main(Native Method)

Manifest XML of Project:

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.project"
android:versionCode="4"
android:versionName="4.0" >

<!-- Permissions -->
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.INTERNET" />
<supports-screens android:anyDensity="true" />

<!-- SDK Settings -->
<uses-sdk
    android:minSdkVersion="11"
    android:targetSdkVersion="18" />

<!-- APP Start -->
<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >

<!-- App Activity -->
    <activity
        android:name="com.example.project.MainActivity"
        android:label="@string/app_name"
        android:screenOrientation="portrait" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>

<!-- Library Activity -->
    <activity android:name="com.example.lib.MainActivity" android:label="LibMain">
         <intent-filter>
        <action android:name="android.intent.action.MAIN"></action>
     </intent-filter>
    </activity>

</application>
<!-- END - APP -->

</manifest>

What am I overlooking? Any suggestions?

EDIT

I updated the manifest.xml with all other activities & somehow, that resolved the problem. The intent activity starts up without any errors. BUT, this is only on AVD. On actual device, it is still throwing same error. I have uninstalled the app from device completely and reinstalled, yet the same error.

Answer 1

The exception is clear. You need to set android:exported="true" in your AndroidManifest.xml file where you declare this Activity.

Edit

<activity
    android:name="com.example.lib.MainActivity"
    android:label="LibMain" 
    android:exported="true">
    <intent-filter>
        <action android:name="android.intent.action.MAIN" >
        </action>
    </intent-filter>
</activity>