SystemParadox SystemParadox - 1 month ago 19
Android Question

Cordova - modify or remove MainActivity

I am developing a Cordova application which should run in a "Kiosk" mode - the device will be locked to that app and should not be able to exit.

To achieve this I am using a slightly modified version of cordova-plugin-kiosk, which provides an extra activity (

KioskActivity
) that is defined as a launcher (it has
android.intent.category.HOME
).

This works reasonably well. However, the app still has the original cordova MainActivity, which causes some confusion, especially as this is what gets launched by the icon in the original launcher, and by the
cordova run android
command. It also results in two entries in the Chrome remote inspector.

The
AndroidManifest.xml
looks like this at the moment:

<activity android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale|uiMode" android:label="@string/activity_name" android:launchMode="singleTop" android:name="MainActivity" android:screenOrientation="portrait" android:theme="@android:style/Theme.DeviceDefault.NoActionBar" android:windowSoftInputMode="adjustResize">
<intent-filter android:label="@string/launcher_name">
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale|uiMode" android:label="@string/activity_name" android:launchMode="singleInstance" android:name="jk.cordova.plugin.kiosk.KioskActivity" android:screenOrientation="portrait" android:theme="@android:style/Theme.NoTitleBar.Fullscreen" android:windowSoftInputMode="adjustResize">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.DEFAULT" />
<category android:name="android.intent.category.HOME" />
</intent-filter>
</activity>


I would like to merge these into a single activity and do away with the confusion.

I can see 2 possible ways to do this:


  1. Find a way to remove the
    MainActivity
    section from the
    AndroidManifest.xml
    , and hopefully also to make
    cordova run android
    run
    KioskActivity
    instead.

  2. Find a way to modify
    MainActivity
    and move the code from
    KioskActivity
    into it.



However, I cannot find any sensible way to achieve either of these without causing more confusion by breaking all the cordova tools.

Answer

There are two possible solutions to this:

1. Use a hook to modify MainActivity

Use a hook to copy a custom MainActivity.java into platforms/android/src/[packageName]/ and override the default Cordova MainActivity.

For example, a before_build hook can be added to <platform name="android"> section of the config.xml like this:

<hook type="before_build" src="scripts/updateMainActivity.sh" />

Where scripts/updateMainActivity.sh is:

#!/bin/bash
cp MainActivity.java platforms/android/src/[packageName]/

(You can also write hooks with nodeJS, which is good for cross-platform compatibility)

2. Use cordova-custom-config to remove MainActivity

With cordova-custom-config, all you need to do is add the following to the <platform name="android"> section of your config.xml:

<preference name="android-manifest/application/activity[@android:name='MainActivity']" delete="true" />

Note: You will need cordova-custom-config >= 3.0.0.

This is the solution I went with, since I am already using cordova-custom-config.

Comments