AndroidManifest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
        package="com.android.certinstaller">

    <original-package android:name="com.android.certinstaller" />

    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

    <application android:label="@string/app_name"
                 android:allowBackup="false">
        <activity android:name=".CertInstallerMain"
                  android:theme="@style/Transparent"
                  android:configChanges="orientation|keyboardHidden">
            <intent-filter>
                <action android:name="android.credentials.INSTALL" />
                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
            <intent-filter>
                <action android:name="android.intent.action.VIEW" />
                <category android:name="android.intent.category.DEFAULT" />
                <data android:mimeType="application/x-x509-ca-cert" />
                <data android:mimeType="application/x-x509-user-cert" />
                <data android:mimeType="application/x-pkcs12" />
            </intent-filter>
        </activity>

        <activity android:name=".CertInstaller"
                  android:theme="@style/Transparent"
                  android:configChanges="orientation|keyboardHidden">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </activity>

        <activity android:name=".CertFileList"
                  android:configChanges="orientation|keyboardHidden">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </activity>
    </application>
</manifest>