Android : Permission Denied Error when changing Launcher Activity

问题

I have an android app that I am trying to launch and it gives me the error

java.lang.SecurityException: Permission Denial: starting Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10000000 cmp=com.hoosierag/.MainActivity } from null (pid=32395, uid=2000) not exported from uid 10125

I get this error when I try to change the launcher activity in the manifest. Also I dont get this error when I launch it on the emulator, but when I try to launch it on a device. I have tried it on 3 different android devices and it gave the same error all three times. Here is my manifest code :

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.hoosierag"
      android:versionName="1.11" android:versionCode="4">
        <uses-sdk android:minSdkVersion="3"/>
        <uses-permission android:name="android.permission.INTERNET" />
        <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission>
        <uses-permission android:name="android.permission.WAKE_LOCK"></uses-permission>
        <uses-permission android:name="android.permission.DISABLE_KEYGUARD"></uses-permission>
        <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"></uses-permission>
        <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"></uses-permission>


    <application android:icon="@drawable/icon" android:label="@string/app_name" android:theme="@android:style/Theme.NoTitleBar">
        <activity android:name=".MainActivity" android:screenOrientation="portrait"
                  android:label="MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name="Main" android:screenOrientation="portrait"/>
        <activity android:name="News" android:screenOrientation="portrait"/>
        <activity android:name="Audio" android:screenOrientation="portrait"/>

Initially the Launcher Activity was the activity called Main. I then created a new activity called MainActivity and made that the launcher class.

回答1:

As stated by Jomia:

The java.lang.SecurityException you are seeing is because you may enter two entries pointing to same activity. Remove the second one and you should be good to go.

and finally after changing Main activity to MainActivity in manifest Clean your Project from Project->Clean... before running on device

回答2:

You should try to mark MainActivity in your AndroidManifest.xml with attribute exported. Like this:

<activity android:exported="true" android:name=".MainActivity" android:screenOrientation="portrait" android:label="MainActivity">

回答3:

Frequently, requires null in a SecurityException means that the component is not exported. There is a possibility that may not be a your problem. Activity is automatically exported when it has an <intent-filter> tag. I recommend