Using Java Prettify for Android app syntax highlighting

Question

I need to integrate syntax highlighting into my application for Android. I tried using Java Prettify(https://code.google.com/p/java-prettify) but I am failing to integrate it. The app is crashing. And since my avd isnt working, so I cannot get information from logcat about the crash.

I am following this info : https://code.google.com/p/java-prettify/wiki/UseTheParserAlone

My code till now :

import java.util.HashMap;
import java.util.List;
import java.util.Map;

import prettify.PrettifyParser;
import syntaxhighlight.ParseResult;
import syntaxhighlight.Parser;

public class PrettifyHighlighter {
Map<String, String> COLORS = buildColorsMap();
String FONT_PATTERN = "<font color=\"#%s\">%s</font>";
Parser parser = new PrettifyParser();

public String highlight(String fileExtension, String sourceCode) {
    StringBuilder highlighted = new StringBuilder();
    List<ParseResult> results = parser.parse(fileExtension, sourceCode);
    for(ParseResult result : results){
        String type = result.getStyleKeys().get(0);
        String content = sourceCode.substring(result.getOffset(), result.getOffset() + result.getLength());
        highlighted.append(String.format(FONT_PATTERN, getColor(type), content));
    }
    return highlighted.toString();
}

private String getColor(String type){
    return COLORS.containsKey(type) ? COLORS.get(type) : COLORS.get("pln");
}

private static Map<String, String> buildColorsMap() {
    Map<String, String> map = new HashMap<String, String>();
    map.put("typ", "87cefa");
    map.put("kwd", "00ff00");
    map.put("lit", "ffff00");
    map.put("com", "999999");
    map.put("str", "ff4500");
    map.put("pun", "eeeeee");
    map.put("pln", "ffffff");
    return map;
}

}

While debugging, I found out that when I commented the line : Parser parser = new PrettifyParser();

and it's related lines, there was no crashing of app. I googled but failed to get a solution.

My logcat :

03-02 07:57:12.300: E/AndroidRuntime(1245): FATAL EXCEPTION: main
03-02 07:57:12.300: E/AndroidRuntime(1245): Process: com.himanshujaju.codeit, PID: 1245
03-02 07:57:12.300: E/AndroidRuntime(1245): java.lang.NoClassDefFoundError: prettify.PrettifyParser
03-02 07:57:12.300: E/AndroidRuntime(1245):     at com.himanshujaju.codeit.PrettifyHighlighter.<init>(PrettifyHighlighter.java:14)
03-02 07:57:12.300: E/AndroidRuntime(1245):     at com.himanshujaju.codeit.codeArea$Run.onPostExecute(codeArea.java:193)
03-02 07:57:12.300: E/AndroidRuntime(1245):     at com.himanshujaju.codeit.codeArea$Run.onPostExecute(codeArea.java:1)
03-02 07:57:12.300: E/AndroidRuntime(1245):     at android.os.AsyncTask.finish(AsyncTask.java:632)
03-02 07:57:12.300: E/AndroidRuntime(1245):     at android.os.AsyncTask.access$600(AsyncTask.java:177)
03-02 07:57:12.300: E/AndroidRuntime(1245):     at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:645)
03-02 07:57:12.300: E/AndroidRuntime(1245):     at android.os.Handler.dispatchMessage(Handler.java:102)
03-02 07:57:12.300: E/AndroidRuntime(1245):     at android.os.Looper.loop(Looper.java:137)
03-02 07:57:12.300: E/AndroidRuntime(1245):     at android.app.ActivityThread.main(ActivityThread.java:4998)
03-02 07:57:12.300: E/AndroidRuntime(1245):     at java.lang.reflect.Method.invokeNative(Native Method)
03-02 07:57:12.300: E/AndroidRuntime(1245):     at java.lang.reflect.Method.invoke(Method.java:515)
03-02 07:57:12.300: E/AndroidRuntime(1245):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:777)
03-02 07:57:12.300: E/AndroidRuntime(1245):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:593)
03-02 07:57:12.300: E/AndroidRuntime(1245):     at dalvik.system.NativeStart.main(Native Method)

It's a java library, there are some classes don't exist on android (for example: swing.*). You can try one https://code.google.com/p/android-codepad/ — ductran, Mar 02 '14 at 07:15
http://stackoverflow.com/a/19787125/1340797 ... This is where I had seen this method for highlighting. — Himanshu Jaju, Mar 02 '14 at 08:56
I posted in my question that avd isnt starting. It is stuck at the android loading screen forever. And it isnt recognizing my micromax a116i too. — Himanshu Jaju, Mar 02 '14 at 12:01
avd is very slow, you need to wait it start(create avd with small screen maybe better).If you use device, make sure driver has installed. Please google how to do it. Without logcat, I can't help you. — ductran, Mar 02 '14 at 12:17
How can I add this PrettifyHighlighter into my android project — Nabeel K, Oct 27 '15 at 10:40
@R4j how can I add `android-codepad` to android studio ? the link you got doesn't any thing for download. — MHSaffari, Dec 21 '17 at 10:19

score 1 · Accepted Answer · edited May 23 '17 at 12:19

1

I tried your code and it worked well.

  PrettifyHighlighter highlighter = new PrettifyHighlighter();
  String code = "for (int i = 0; i < 5; i++){System.out.println(i);}";
  String highlighted = highlighter.highlight("java", code);
  textView1.setText(Html.fromHtml(highlighted));

Here is the output Textview on emulator

highlight

For the NoClassDefFoundError exception, look like eclipse doesn't export jar library when it builds. Try this answer.

edited May 23 '17 at 12:19

Community

1
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answered Mar 02 '14 at 14:19

ductran

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Sorry too late to comment over this question but it gives strings as output.. In other words it does not intent the code... Is there any way it can retain the indentations – Sachin Bahukhandi Oct 11 '16 at 11:29

Using Java Prettify for Android app syntax highlighting

1 Answers1