A library for running JavaScript in Android apps.

Last update: Dec 9, 2022

Related tags

Overview

JsEvaluator library for running JavaScript in Android apps

JsEvaluator may help you run JavaScript in an Android app and get the results. This is an alternative to evaluateJavascript method of the WebView. Supports Android version 4.0 (Ice Cream Sandwich) and newer.

Setup

There are two ways your can add JsEvaluator to your project:

From a remote Maven repository.
From a local .aar or .jar file.

1. Setup from Maven repository in Android Studio

Add maven { url "https://jitpack.io" } into allprojects/repositories section of your project build.gradle file. For example:

allprojects {
    repositories {
        jcenter()
        maven { url "https://jitpack.io" }
    }
}

Add compile 'com.github.evgenyneu:js-evaluator-for-android:v5.0.0' into dependencies section of your module build.gradle file. For example:

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    // Keep you existing dependencies here
    implementation 'com.github.evgenyneu:js-evaluator-for-android:v5.0.0'
}

For less information, see Gradle/Maven setup instructions on JsEvaluator jitpack.io page.

2. Setup from local .aar file

Download jsevaluator-1.0.aar. You can also build it yourself into jsevaluator/build/outputs/aar/ directory in Android Studio with this command:

./gradlew :jsevaluator:aR

Add aar file to Android Studio project

To add JsEvaluator to your app in Android Studio:

Copy the jsevaluator-1.0.aar to your app/libs folder.
Add compile(name:'jsevaluator-1.0', ext:'aar') to dependencies block of your module build.gradle file.

dependencies {
    compile(name:'jsevaluator-1.0', ext:'aar')
}

Add the following code to the allprojects/repositories block of your project build.gradle file.

allprojects {
    repositories {
        jcenter()
        flatDir {
            dirs 'libs'
        }
    }
}

Add jar file to Eclipse project

Unzip the jsevaluator-1.0.aar and get the classes.jar from it. You may want to rename it to jsevaluator.jar.
Open properties for your app project.
Select Libraries tab in Java Build Path.
Click Add JARs... button and select the .jar file.
In your project properties click Order and export tab.
Tick the .jar file.

Usage

Create evaluator instance variable in your activity:

public class MainActivity extends AppCompatActivity {
    JsEvaluator jsEvaluator = new JsEvaluator(this);

this is a reference to your activity.

Evaluate JavaScript

jsEvaluator.evaluate("2 * 17", new JsCallback() {
  @Override
  public void onResult(String result) {
    // Process result here.
    // This method is called in the UI thread.
  }

  @Override
  public void onError(String errorMessage) {
    // Process JavaScript error here.
    // This method is called in the UI thread.
  }
});

Note: make sure to call evaluate method in UI thread.

Call a JavaScript function

jsEvaluator.callFunction("function myFunction(a, b, c, d) { return 'result'; }",
  new JsCallback() {

  @Override
  public void onResult(String result) {
    // Process result here.
    // This method is called in the UI thread.
  }

  @Override
  public void onError(String errorMessage) {
    // Process JavaScript error here.
    // This method is called in the UI thread.
  }
}, "myFunction", "parameter 1", "parameter 2", 912, 101.3);

Any number of string, int or double parameters can be supplied.

Note: make sure to call callFunction method in UI thread.

JavaScript is evaluated asynchronously

JavaScript is evaluated asynchronously without blocking UI thread. Result is returned in the UI thread. It is required to call evaluate and callFunction in UI thread.

JavaScript is evaluated in new context

Each time the JavaScript is evaluated in the new context. It can not access the result of a previous evaluation. Please concatenate all your JavaScript to one string and evaluate it in one go.

For example, if you need to load jQuery libary and then use it:

String jQuery = "/*! jQuery JavaScript Library v2.1.1 ...";
jsEvaluator.evaluate(jQuery + "; $.isNumeric(123)", new JsCallback() { ...

Advanced functionality

Destroying the evaluator

Calling the destroy() method will destroy the Web View used by JsEvaluator and clear the memory. JsEvaluator can not be used after it is destroyed.

jsEvaluator.destroy();

Accessing the WebView

Here is how to get the instance to the web view used by the JsEvaluator.

WebView webView = jsEvaluator.getWebView();

Known limitations

This library is suitable for evaluating only small amounts of JavaScript within hundreds of KB. It has been reported that the library can not evaluate a megabyte of JavaScript. If you run into similar problems you can try ericwlange/AndroidJSCore library instead.

How it works

Behind the scenes it creates a WebView and feeds it JavaScript code for evaluation:

mWebView = new WebView(context);
String javascript = "<script>myObj.returnResult('Hello World')</script>";
byte[] data = javascript.getBytes("UTF-8");
String base64 = Base64.encodeToString(data, Base64.DEFAULT);
mWebView.loadUrl("data:text/html;charset=utf-8;base64," + base64);

The result of evaluation is sent back into Android activity:

public class JavaScriptInterface {
   public void returnResult(String result) {
      // result from JavaScript
   }
}

mWebView.addJavascriptInterface(new JavaScriptInterface(), "myObj");

Catching JavaScript errors

This library catches errors by wrapping the whole JavaScript code in a try-catch block. The errors are then returned to Java in the onError method of the callback object.

jsEvaluator.evaluate("4 * octapod", new JsCallback() {
   @Override
   public void onResult(String result) { }

   @Override
   public void onError(String errorMessage) {
      // errorMessage => "ReferenceError: octapod is not defined"
   }
});

Please note that this method only catches runtime JavaScript errors, like undefined variables or properties. It will not, however, catch errors resulted from malformed JavaScript code, like missing a } bracket.

Using with ProGuard

If you are using ProGuard (minifyEnabled true) you can add these rules to your proguard-rules.pro file.

# js-evaluator-for-android
-keepattributes JavascriptInterface
-keepclassmembers class * {
    @android.webkit.JavascriptInterface <methods>;
}

You will most likely not need to modify your proguard file because JSEvaluator uses consumer proguard rules.

Tests

Tests are located in app module of this project. The app can be run for manual testing as well.

Or run as Android JUnit Test for unit testing.

Android versions tested:

4.0.3 (Ice Cream Sandwich)
4.1.2, 4.2.2, 4.3 (Jelly Bean)
4.4.2 (KitKat)
5.0, 5.1 (Lollipop)
6.0 (Marshmallow)
8.0 (Oreo)

Thanks 👍

codebymikey for adding error handling.
xbao for adding a Gradle file.
clydzik for fixing a memory leak and simplifying the code.

Feedback is welcome

If you have any issues or need help please do not hesitate to create an issue ticket.

Comments

Gradle build and maven, downloadable jar

Great library, mind adding to maven central repository? a downloadable jar would be handy too. Also, I can't find a build script(gradle or maven) in the project, so i assume that you are using ADT's build feature. I would recommend migrating to maven/gradle if possible.

Thanks

opened by tom91136 13
subsequent registered of evaluation is not executed

If i request com.evgenii.jsevaluator.JsEvaluator#evaluate(java.lang.String, com.evgenii.jsevaluator.interfaces.JsCallback)

few times in short time distance (when previous is not evaluated) the previously scheduled evaluation is not delivered as success or failure

probably reason: loadUrl method of webView is cancelling previously page that is opening in: com.evgenii.jsevaluator.WebViewWrapper#loadJavaScript

opened by clydzik 12
ReferenceError

Getting this error when I use your js evaluator:

I/chromium﹕ [INFO:CONSOLE(1)] "Uncaught ReferenceError: yourFunc is not defined", source: data:text/html;charset=utf-8;base64,PHNjcmlwdD5ldmdlbmlpSnNFdmFsdWF0b3IucmV0dXJuUmVzdWx0VG9KYXZhKGV2YWwoJ19fX19qc2JyaWRnZV9yZWFkXzE0MjA5NzkyNDE1OTdfNDg2KCk7JyksIDIpOzwvc2NyaXB0Pg==(1)

Android: 5.0.1 Nexus 5

opened by MustafaFerhan 11
Wrong output

I try with this eval:

eval(function(p,a,c,k,e,d){e=function(c){return(c<a?'':e(parseInt(c/a)))+((c=c%a)>35?String.fromCharCode(c+29):c.toString(36))};if(!''.replace(/^/,String)){while(c--){d[e(c)]=k[c]||e(c)}k=[function(e){return d[e]}];e=function(){return'\\w+'};c=1};while(c--){if(k[c]){p=p.replace(new RegExp('\\b'+e(c)+'\\b','g'),k[c])}}return p}('1I k=1G 1o();1I j=1G 1o();k[2]="d://1.g.e.a/-1V/25/26/24/i/h-1W.b?f=0";k[12]="o://p.c.q/n/s/m-l-t-r/1/c.a-P.b";k[19]="o://p.c.q/n/s/m-l-t-r/1/c.a-1O.b";k[3]="d://1.g.e.a/-1X/1Y/1Z/1K/i/h-1u.b?f=0";k[7]="o://p.c.q/n/s/m-l-t-r/1/c.a-1L.b";k[17]="d://1.g.e.a/-1b/1c/R/1k/i/h-1l.b?f=0";k[13]="d://1.g.e.a/-Z/1a/X/W/i/h-S.b?f=0";k[5]="d://1.g.e.a/-1p/1q/1r/1y/i/h-1z.b?f=0";k[16]="o://p.c.q/n/s/m-l-t-r/1/c.a-1h.b";k[8]="d://1.g.e.a/-J/I/H/G/i/h-K.b?f=0";k[1]="d://1.g.e.a/-1F/1E/1A/1B-1C/i/h-1D.b?f=0";k[22]="o://p.c.q/n/s/m-l-t-r/1/c.a-U.b";k[11]="o://p.c.q/n/s/m-l-t-r/1/c.a-1H.b";k[0]="o://p.c.q/n/s/m-l-t-r/1/c.a-1n.b";k[18]="d://1.g.e.a/-1d/1e/1f/1g/i/h-1m.b?f=0";k[20]="d://1.g.e.a/-w/x/E/F/i/h-M.b?f=0";k[15]="o://p.c.q/n/s/m-l-t-r/1/c.a-1M.b";k[21]="d://1.g.e.a/-O-Q/1j/1J/1R/i/h-1S.b?f=0";k[14]="d://1.g.e.a/-1i/V/T/Y/i/h-1N.b?f=0";k[23]="d://1.g.e.a/-A/C/D/z-y-u/i/h-v.b?f=0";k[4]="o://p.c.q/n/s/m-l-t-r/1/c.a-1U.b";k[10]="d://1.g.e.a/-1v/1w/1x/1t/i/h-1s.b?f=0";k[6]="o://p.c.q/n/s/m-l-t-r/1/c.a-1Q.b";k[9]="d://1.g.e.a/-1P/1T/B/L/i/h-N.b?f=0";j[4]="o://p.c.q/n/s/m-l-t-r/1/c.a-1U.b";j[0]="o://p.c.q/n/s/m-l-t-r/1/c.a-1n.b";j[9]="d://1.g.e.a/-1P/1T/B/L/i/h-N.b?f=0";j[12]="o://p.c.q/n/s/m-l-t-r/1/c.a-P.b";j[14]="d://1.g.e.a/-1i/V/T/Y/i/h-1N.b?f=0";j[13]="d://1.g.e.a/-Z/1a/X/W/i/h-S.b?f=0";j[22]="o://p.c.q/n/s/m-l-t-r/1/c.a-U.b";j[17]="d://1.g.e.a/-1b/1c/R/1k/i/h-1l.b?f=0";j[16]="o://p.c.q/n/s/m-l-t-r/1/c.a-1h.b";j[18]="d://1.g.e.a/-1d/1e/1f/1g/i/h-1m.b?f=0";j[23]="d://1.g.e.a/-A/C/D/z-y-u/i/h-v.b?f=0";j[20]="d://1.g.e.a/-w/x/E/F/i/h-M.b?f=0";j[8]="d://1.g.e.a/-J/I/H/G/i/h-K.b?f=0";j[21]="d://1.g.e.a/-O-Q/1j/1J/1R/i/h-1S.b?f=0";j[6]="o://p.c.q/n/s/m-l-t-r/1/c.a-1Q.b";j[7]="o://p.c.q/n/s/m-l-t-r/1/c.a-1L.b";j[15]="o://p.c.q/n/s/m-l-t-r/1/c.a-1M.b";j[19]="o://p.c.q/n/s/m-l-t-r/1/c.a-1O.b";j[2]="d://1.g.e.a/-1V/25/26/24/i/h-1W.b?f=0";j[3]="d://1.g.e.a/-1X/1Y/1Z/1K/i/h-1u.b?f=0";j[10]="d://1.g.e.a/-1v/1w/1x/1t/i/h-1s.b?f=0";j[5]="d://1.g.e.a/-1p/1q/1r/1y/i/h-1z.b?f=0";j[11]="o://p.c.q/n/s/m-l-t-r/1/c.a-1H.b";j[1]="d://1.g.e.a/-1F/1E/1A/1B-1C/i/h-1D.b?f=0";',62,131,'||||||||||com|jpg|truyentranh8|https|blogspot|imgmax|bp|TT8|s0|lstImagesVIP|lstImages|doi|hoan|u2|http|manga|net|duyen|Htri|tinh|4s|zzzkhunggio|oTcWB5IICnU|WG4iIQzY6iI|dE4I|A80|7McjvzgCT9E|AAAAAAAAayw|WG4iJX04U5I|AAAAAAAAazQ|AAAAAAAAazI|F9sH6L_VR30|o8syNjzsIfE|AAAAAAAAays|WG4iFvpXkwI|TWXYlIwN5Dk|008|LgDvNGvjurw|021|009|SmNKAMmRM|012||AAAAAAAAazA|013|AAAAAAAAay8|023|WG4iHKtv32I|Z6E2N6NUFBw|AAAAAAAAay4|vADOhUnUiso|ZXWhsekCA3I|||||||||||WG4iGxztlpI|Ap2CFL63QFM|WG4iH4px29I|OPz_3DkYMbw|WG4iIN93jPI|AAAAAAAAazE|kiVrL5ZAA88|017|Y320ZdJuPY0|WG4iI6BxACI|rvUmYbgD7tY|018|019|000|Array|k9mlgNJHuVM|WG4iFOfgwSI|AAAAAAAAayo|010|cAh2IcoOs1w|003|QAUotTf3k_g|WG4iGNX1BSI|AAAAAAAAay0|4ALYh18UjZs|005|AAAAAAAAayk|ti|AmvOgJgc|001|WG4iEHZAciI|ZWjJefQ8IIs|new|011|var|AAAAAAAAazM|WFKexhZFTaY|007|016|015|020|z0XlG81dBaA|006|H9MwQe5nVTQ|022|WG4iFkTVrgI|004|GBBdDaauQbU|002|xq5EoDrXHT4|WG4iEKasRWI|AAAAAAAAayg|||||tOuTbRIUrFI|WG4iDqdT73I|AAAAAAAAayc'.split('|'),0,{}))

Only last element of ouput array return.

opened by mdtuyen 10
method onResult just didn't callback
I have a md5.js file in assets/md5.js,and there is a js function which i want to call from my Activity,but I didn't get the callback,Instead I got an error:
"Uncaught SyntaxError: Unexpected token ILLEGAL", source: data:text/html;charset=utf-8;base64,PHNjcmlwdD5ldmdlbmlpSnNFdmFsdWF0b3IucmV0dXJuUmVzdWx0VG9KYXZhKGV2YWwoJ2Z1bmN0aW9uIG1kNWpzKHBhc3MsIGNvZGUsIHVpbikgew1cbnZhciBJID0gaGV4Y2hhcjJiaW4obWQ1KHBhc3MpKTsNXG52YXIgSCA9IG1kNShJICsgdWluKTsNXG52YXIgRyA9IG1kNShIICsgY29kZS50b1VwcGVyQ2FzZSgpKTsNXG5yZXR1cm4gRw1cbn0NXG4NXG5mdW5jdGlvbiBjaGt5em0ob2JqKSB7DVxuIGlmKG9iai52YWx1ZSE9XCdcJykgew1cbiAgIHZhciBzPW1kNShtZDUob2JqLnZhbHVlLnRvVXBwZXJDYXNlKCkpLnN1YnN0cmluZygwLDMwKS50b1VwcGVyQ2FzZSgpK1wnMTA4MTJcJykuc3Vic3RyaW5nKDAsMzApLnRvVXGNvcmVfbWQ1KH... Below is my code:

@Override protected void onCreate(Bundle savedInstanceState) { requestWindowFeature(Window.FEATURE_NO_TITLE); super.onCreate(savedInstanceState); setContentView(R.layout.activity_login); init(); new GetCodeThread().start(); mJsEvaluator = new JsEvaluator(this); md5("r27e"); } private void md5(String str) { String jscode = Utils.loadJs("md5.js", this); Log.e("ghui","jscode: " + jscode); mJsEvaluator.callFunction(jscode, new JsCallback() { @Override public void onResult(String s) { Log.e("ghui", "-------------------------after md5:" + s); //no callback } }, "chkyzm", str); }

and the chkyzm is a function in md5.js

Thanks very much in advance!!!
opened by graycreate 8
JsEvaluator mResultCallback is growing and do not realease previous callbacks

i realized that this list is holding results callbacks (probably for matching request/response interface) but as self is not maintained after finish (success or failure) com.evgenii.jsevaluator.JsEvaluator#mResultCallbacks

the workaround is to use jsEvaluator.getResultCallbacks().remove();

but this is not documented and a bit awkward

opened by clydzik 7
Expose internal Webview for destroying

Would it be possible to expose the internal WebView object being used to run the evaluations?

This is needed so that I can successfully destroy and clean up the Webview instances accordingly - http://stackoverflow.com/questions/17418503/destroy-webview-in-android, otherwise they're kept in memory even after the JsEvaluator is destroyed.

Better yet, is it possible to add a destroy() method as well as exposing the Webview instance thus giving users more flexibility about what can/what can't be done with the JavaScript.

opened by autovalue 6
Urgent: Gradle Build failed
If I try to install via gradle I get an error that gradle can not resolve the package via jitpack.

So I looked at https://jitpack.io/com/github/evgenyneu/js-evaluator-for-android/v1.0.2/build.log

To see following build error:

Start: Fri Oct 16 02:17:52 UTC 2015 Git: v1.0.2 commit 8222e4efb8e9dbab358625e63074d3c6ddb3b913 Merge: 2183e19 a0bf9c6 Author: Evgenii Neumerzhitckii Date: Thu Jun 25 21:45:47 2015 +1000

Merge branch 'master' of github.com:evgenyneu/js-evaluator-for-android

submodule status: Run gradle build Gradle build script Picked up JAVA_TOOL_OPTIONS: -Dfile.encoding=UTF-8 Picked up JAVA_TOOL_OPTIONS: -Dfile.encoding=UTF-8 Downloading https://services.gradle.org/distributions/gradle-2.2.1-all.zip .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................. Unzipping /home/jitpack/.gradle/wrapper/dists/gradle-2.2.1-all/6dibv5rcnnqlfbq9klf8imrndn/gradle-2.2.1-all.zip to /home/jitpack/.gradle/wrapper/dists/gradle-2.2.1-all/6dibv5rcnnqlfbq9klf8imrndn Set executable permissions for: /home/jitpack/.gradle/wrapper/dists/gradle-2.2.1-all/6dibv5rcnnqlfbq9klf8imrndn/gradle-2.2.1/bin/gradle

Gradle 2.2.1

Build time: 2014-11-24 09:45:35 UTC Build number: none Revision: 6fcb59c06f43a4e6b1bcb401f7686a8601a1fb4a

Groovy: 2.3.6 Ant: Apache Ant(TM) version 1.9.3 compiled on December 23 2013 JVM: 1.7.0_76 (Oracle Corporation 24.76-b04) OS: Linux 3.13.0-36-generic amd64

Getting a list of gradle tasks Picked up JAVA_TOOL_OPTIONS: -Dfile.encoding=UTF-8

FAILURE: Build failed with an exception.

What went wrong: A problem occurred configuring project ':app'.

failed to find Build Tools revision 23.0.0 rc2

Try: Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Picked up JAVA_TOOL_OPTIONS: -Dfile.encoding=UTF-8

FAILURE: Build failed with an exception.

What went wrong: A problem occurred configuring project ':app'.

failed to find Build Tools revision 23.0.0 rc2

Try: Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Gradle 'install' task not found. Please add the 'maven' or 'android-maven' plugin. See the documentation and examples: https://jitpack.io/docs/

Found android library build file ./jsevaluator/build.gradle Running: ./gradlew clean -Pgroup=com.github.evgenyneu -Pversion=v1.0.2 install Picked up JAVA_TOOL_OPTIONS: -Dfile.encoding=UTF-8 Download https://jcenter.bintray.com/com/github/dcendents/android-maven-plugin/1.2/android-maven-plugin-1.2.pom Download https://jcenter.bintray.com/com/github/dcendents/android-maven-plugin/1.2/android-maven-plugin-1.2.jar Gradle version 2.2.1

FAILURE: Build failed with an exception.

What went wrong: A problem occurred configuring project ':app'.

failed to find Build Tools revision 23.0.0 rc2

Try: Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

BUILD FAILED

Total time: 6.82 secs No build artifacts found
opened by sittingbool 5
Percent-encoding is not escaped correctly.

Hi

I am currently working on ComplexAlarm which evolves to get opening_hours.js running on Android which currently does not work: [INFO:CONSOLE(1)] "Uncaught SyntaxError: Unexpected token ILLEGAL", source: about:blank (1)

The mini example is: "if(5%12)true;" It seems that "%12" gets interpreted as percent-encoding. I was able to find a workaround which is to replace "%" with "% ". With this workaround opening_hours.js now seems to run successfully with js-evaluator-for-android :+1:

opened by ypid 5
where to find functions ?

Hi. Love the plugin, but where can i find which mat functions can i use ? I used Math.sqrt() and it works bc i tried from someones video tutorial and want too see whic other fuctions work and possibly add some.

opened by crvenizg 4

How to add custom JavascriptInterface?

jsEvaluator.getWebView().addJavascriptInterface(new MyJsInterface(), "myInterface");
jsEvaluator.evaluate("myInterface.someMethod('string')", new JsCallback() { ...

I add my JavascriptInterface, but callback onError :

TypeError: undefined is not a function

opened by veesong 4

request

please tell me someone has already used this Lib for a App that can handle this pseudo code:

var a1=numberfield(namestring, digits); var a2=numberfield(namestring, digits); var b=numberfield(namestring, digits); var result=textfield(whatever); function calc(){ if(a2>0)return (a1+a2)/2+b; else return something; }

well, not exacly that code. i know this is not the right place, please be gracious to me.

opened by theduskin 0
do it async value

I tried 87234 times to return value with CountDownLatch but i cant. please update the source, make it async and returnable script.

CountDownLatch and others not working with javascript handler in your project sources. you should add the handler to return values. i dont wanna use the webView.evaluateJavascript()

opened by kodlayanzi 0
Is callFunction working with async function in js?
I am trying to pass data to javascript and return the value using return await sth in that async function. But I am getting the undefined value

for the context, I am using a chatbot library

var bot = new RiveScript({utf8: true}); async function getRsReply(code,user,input) { bot.stream(code); bot.sortReplies(); var result = await bot.reply(user, input); return result; }

the result in the JsCallback returned undefined
opened by BennyKok 13

Owner

Evgenii Neumerzhitckii

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