Main.java Source code

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Here is the source code for Main.java

Source

//package com.java2s;
//License from project: Apache License 

import java.io.File;
import java.io.IOException;
import org.xmlpull.v1.XmlPullParserException;
import java.lang.reflect.Method;
import java.lang.reflect.InvocationTargetException;
import android.content.res.XmlResourceParser;
import org.xmlpull.v1.XmlPullParser;
import android.content.res.AssetManager;

public class Main {
    /**
     * Parses AndroidManifest.xml of the given apkFile and returns the value of
     * minSdkVersion using undocumented API which is marked as
     * "not to be used by applications"
     * 
     * @return minSdkVersion or -1 if not found in AndroidManifest.xml
     */
    public static int getMinSdkVersion(File apkFile) {
        if (apkFile == null) {
            return -1;
        }

        try {
            XmlResourceParser parser = getParserForManifest(apkFile);
            if (parser == null) {
                return -1;
            }
            while (parser.next() != XmlPullParser.END_DOCUMENT) {
                if (parser.getEventType() == XmlPullParser.START_TAG && parser.getName().equals("uses-sdk")) {
                    for (int i = 0; i < parser.getAttributeCount(); ++i) {
                        if (parser.getAttributeName(i).equals("minSdkVersion")) {
                            return parser.getAttributeIntValue(i, -1);
                        }
                    }
                }
            }
        } catch (XmlPullParserException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

        return -1;
    }

    public static int getMinSdkVersion(String apk_path) {
        if (apk_path == null) {
            return -1;
        }
        return getMinSdkVersion(new File(apk_path));
    }

    /**
     * Tries to get the parser for the given apkFile from {@link AssetManager}
     * using undocumented API which is marked as
     * "not to be used by applications"
     *
     * @throws IOException
     */
    private static XmlResourceParser getParserForManifest(final File APKFILE) throws IOException {
        final Object ASSETMANAGERINSTANCE = getAssetManager();
        final int COOKIE = addAssets(APKFILE, ASSETMANAGERINSTANCE);
        return ((AssetManager) ASSETMANAGERINSTANCE).openXmlResourceParser(COOKIE, "AndroidManifest.xml");
    }

    /**
     * Get {@link AssetManager} using reflection
     */
    private static Object getAssetManager() {
        Class assetManagerClass = null;
        try {
            assetManagerClass = Class.forName("android.content.res.AssetManager");
            return assetManagerClass.newInstance();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (InstantiationException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }

        return null;
    }

    /**
     * Get the cookie of an asset using an undocumented API call that is marked
     * as "no to be used by applications" in its source code
     * 
     * @see <a href="http://androidxref.com/5.1.1_r6/xref/frameworks/base/core/java/android/content/res/AssetManager.java#612">AssetManager.java#612</a>
     * @return the cookie
     */
    private static int addAssets(final File APKFILE, final Object ASSETMANAGERINSTANCE) {
        try {
            Method addAssetPath = ASSETMANAGERINSTANCE.getClass().getMethod("addAssetPath",
                    new Class[] { String.class });
            return (Integer) addAssetPath.invoke(ASSETMANAGERINSTANCE, APKFILE.getAbsolutePath());
        } catch (NoSuchMethodException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }

        return -1;
    }
}