Splashcreen plugin (Cordova) and icons do not work on Crosswalk

Question

I’m using this module that automatically adds a Crosswalk wrapper to a Cordova project.

Obs: It requires "Platform" to be [email protected].

Okay, then I give the command to Wrap the Crosswalk in the project and everything goes well.

It builds normally with the plugin dialogs and others. However when I install the Splashscreen plugin and try to give run, an error happens:

-pre-compile:
     [echo] Set jars path to: /home/rop/Projetos/Pray/cordovaa2/platforms/android/CordovaLib/ant-build/classes.jar:/home/rop/Projetos/Pray/cordovaa2/platforms/android/CordovaLib/xwalk_core_library/ant-build/classes.jar:/home/rop/Projetos/Pray/cordovaa2/platforms/android/CordovaLib/xwalk_core_library/libs/xwalk_core_library_java_app_part.jar:/home/rop/Projetos/Pray/cordovaa2/platforms/android/CordovaLib/xwalk_core_library/libs/xwalk_core_library_java_library_part.jar

-compile:
    [javac] Compiling 5 source files to /home/rop/Projetos/Pray/cordovaa2/platforms/android/ant-build/classes
    [javac] warning: /home/rop/Projetos/Pray/cordovaa2/platforms/android/CordovaLib/xwalk_core_library/libs/xwalk_core_library_java_app_part.jar(org/xwalk/core/XWalkView.class): major version 51 is newer than 50, the highest major version supported by this compiler.
    [javac] It is recommended that the compiler be upgraded.
    [javac] /home/rop/Projetos/Pray/cordovaa2/platforms/android/src/org/apache/cordova/splashscreen/SplashScreen.java:232: cannot find symbol
    [javac] symbol  : method canGoBack()
    [javac] location: class org.apache.cordova.CordovaWebView
    [javac]         if (webView.canGoBack()) {
    [javac]                    ^
    [javac] 1 error
    [javac] 1 warning

BUILD FAILED
/opt/android-sdk/tools/ant/build.xml:720: The following error occurred while executing this line:
/opt/android-sdk/tools/ant/build.xml:734: Compile failed; see the compiler error output for details.

Total time: 4 seconds

/home/rop/Projetos/Pray/cordovaa2/platforms/android/cordova/node_modules/q/q.js:126
                    throw e;
                          ^
Error code 1 for command: ant with args: debug,-f,/home/rop/Projetos/Pray/cordovaa2/platforms/android/build.xml,-Dout.dir=ant-build,-Dgen.absolute.dir=ant-gen
ERROR running one or more of the platforms: Error: /home/rop/Projetos/Pray/cordovaa2/platforms/android/cordova/run: Command failed with exit code 8
You may not have the required environment or OS to run this project

My folder structure:

My config.xml:

<?xml version="1.0" encoding="utf-8"?>
<widget id="io.cordova.hellocordova" version="0.0.1" xmlns="http://www.w3.org/ns/widgets" xmlns:cdv="http://cordova.apache.org/ns/1.0">
    <name>appName</name>
    <description>
        A sample Apache Cordova application that responds to the deviceready event.
    </description>
    <author email="[email protected]" href="http://cordova.io">
        Apache Cordova Team
    </author>
    <content src="index.html" />
    <access origin="*" />
    <platform name="android">

        <splash src="res/android/screen/res-long-port-hdpi/default.png" densitit="port-hdpi"/>
        <splash src="res/android/screen/res-long-port-ldpi/default.png" densitit="port-ldpi"/>
        <splash src="res/android/screen/res-long-port-mdpi/default.png" densitit="port-mdpi"/>
        <splash src="res/android/screen/res-long-port-xhdpi/default.png" densitit="port-xhdpi"/>

        <icon src="res/android/icon/drawable-ldpi/appicon/png" density="ldpi" />
        <icon src="res/android/icon/drawable-mdpi/appicon.png" density="mdpi" />
        <icon src="res/android/icon/drawable-hdpi/appicon.png" density="hdpi" />
        <icon src="res/android/icon/drawable-xhdpi/appicon.png" density="xhdpi" />

    </platform>
</widget>

PS: Also, even icons don’t work, although they don’t depend on Plugins... Every time I run, the app installs with the default icon of Cordova.

Answer 1

As commented the problem is not presented before using the cordova-android-crosswalk, this is due to the library version of Cordova, Crosswalk requires version 3.6.3, this version has some differences between a class called CordovaWebView.java, basically it does not implement all functions of the class and separates between more files. I will not go into too much depth since the problem here is about Cordova and not Java.

But well to solve the problem is quite simple, let’s just edit a file.

Inside the main folder of your project look for the file platforms/android/CordovaLib/src/org/apache/cordova/CordovaWebView.java

Open this file and right after the class declaration CordovaWebView (row 80) paste the following code.

    public boolean canGoBack() {
        return super.getNavigationHistory().canGoBack();
    }

Then try again to give the build command of your project.

Answer 2

According to the wikipedia:

J2SE 8 = 52
J2SE 7 = 51
J2SE 6.0 = 50
J2SE 5.0 = 49
JDK 1.4 = 48
JDK 1.3 = 47
JDK 1.2 = 46
JDK 1.1 = 45

In your mistakes appears this:

warning: /home/rop/Projetos/Pray/cordovaa2/platforms/android/CordovaLib/xwalk_core_library/libs/xwalk_core_library_java_app_part.jar(org/xwalk/core/XWalkView.class): major version 51 is newer than 50, the highest major version supported by this compiler.

Let’s pay special attention to that:

(org/xwalk/core/Xwalkview.class): major version 51 is newer than 50, the Highest major version supported by this Compiler.

You have informed your compiler (while trying to use javac -version) is 1.6.0_34, i.e., major version 50. However, apparently the class org.xwalk.core.XWalkView was compiled with Java 7 (major version 51) and as a result the compiler of Java 6 is not able to understand or use it.

To solve this, I see three possible alternatives (not mutually exclusive):

• Upgrade your compiler to Java 7 or Java 8. However, care must be taken to make sure that android will accept the resulting classes. If these classes use the Try-with-Resources, then they will only work on Android Kitkat (API level 19, Android 4.4) or higher (Source). In addition, Android does not yet accept Java 8, but you can use as one of the options when invoking the compiler, -target 1.6 or -target 1.7.

• Recompile these classes with the Java 6 compiler, if you have the source code.

• Use any tool that downgrades the Java 7 (or 8) class to Java 6. The most well-known tool for this purpose is the retro-lambda.

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As for icons, note this in your XML:

<icon src="res/android/icon/drawable-ldpi/appicon/png" density="ldpi" />

Instead of appicon/png, should be appicon.png. However, I don’t know if that’s all that’s wrong or if there’s something else.

For more details, it would be good for you to better describe your folder structure, in particular what is inside the res.

---

And some tips on your question:

• You forgot to put the tags android and java. As a result, few people saw her question and it only caught my attention because of the active reward. Don’t forget the tags next time!

• Do not put code in image format, because it is difficult to read (because the browser resizes the image) and also the text is not selectable. I only noticed your icon error when rewriting all the XML when editing your question.