读取APK中versionCode信息

import java.io.File;
import java.io.InputStream;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.xmlpull.v1.XmlPullParser;

import android.content.res.AXmlResourceParser;
import android.util.TypedValue;

/**
 * 抽取apk中的信息
 * 
 * @author 
 *
 */
public class ExtractAPK {

	
	/**
	 * 
	 * @param filePath apk路径，例如：/home/ /Qk_test.apk 
	 * @return versionCodee
	 * @throws Exception
	 */
	public String getVersionCode(String filePath) throws Exception {

		String versionCode = null;
		ZipFile zip = null;
		try {

			File file = new File(filePath);
			zip = new ZipFile(file);
			Enumeration enume = zip.entries();

			String filename = null;
			ZipEntry zipEntry = null;
			while (enume.hasMoreElements()) {
				zipEntry = (ZipEntry) enume.nextElement();
				filename = zipEntry.getName();
				if ("AndroidManifest.xml".equalsIgnoreCase(filename)) {
					versionCode = getCode(zip.getInputStream(zipEntry));
					break;
				}
			}

		} catch (Exception e) {
			log.error("读取apk文件失败", e);
			throw e;
		} finally {
			try {
				if (null != zip)
					zip.close();
			} catch (Exception e) {
				log.error("关闭zip失败", e);
			}
		}

		return versionCode;
	}

	private String getCode(InputStream is) throws Exception {

		String versionCode = null;
		try {
			AXmlResourceParser parser = new AXmlResourceParser();
			parser.open(is);
			boolean brek = false;
			while (true) {
				int type = parser.next();
				if (type == XmlPullParser.END_DOCUMENT) {
					break;
				}
				switch (type) {
				case XmlPullParser.START_TAG:
					for (int i = 0; i != parser.getAttributeCount(); ++i) {
						if ("versionCode".equals(parser.getAttributeName(i))) {
							versionCode = getAttributeValue(parser, i);
							brek = true;
							break;
						}
					}
				}

				if (brek) {
					break;
				}
			}

		} catch (Exception e) {
			log.error("读取versionCode失败", e);
			throw e;
		}

		return versionCode;
	}

	private String getAttributeValue(AXmlResourceParser parser, int index) {
		int type = parser.getAttributeValueType(index);
		int data = parser.getAttributeValueData(index);
		if (type == TypedValue.TYPE_STRING) {
			return parser.getAttributeValue(index);
		}
		if (type == TypedValue.TYPE_ATTRIBUTE) {
			return String.format("?%s%08X", getPackage(data), data);
		}
		if (type == TypedValue.TYPE_REFERENCE) {
			return String.format("@%s%08X", getPackage(data), data);
		}
		if (type == TypedValue.TYPE_FLOAT) {
			return String.valueOf(Float.intBitsToFloat(data));
		}
		if (type == TypedValue.TYPE_INT_HEX) {
			return String.format("0x%08X", data);
		}
		if (type == TypedValue.TYPE_INT_BOOLEAN) {
			return data != 0 ? "true" : "false";
		}
		if (type == TypedValue.TYPE_DIMENSION) {
			return Float.toString(complexToFloat(data))
					+ DIMENSION_UNITS[data & TypedValue.COMPLEX_UNIT_MASK];
		}
		if (type == TypedValue.TYPE_FRACTION) {
			return Float.toString(complexToFloat(data))
					+ FRACTION_UNITS[data & TypedValue.COMPLEX_UNIT_MASK];
		}
		if (type >= TypedValue.TYPE_FIRST_COLOR_INT
				&& type <= TypedValue.TYPE_LAST_COLOR_INT) {
			return String.format("#%08X", data);
		}
		if (type >= TypedValue.TYPE_FIRST_INT
				&& type <= TypedValue.TYPE_LAST_INT) {
			return String.valueOf(data);
		}
		return String.format("<0x%X, type 0x%02X>", data, type);
	}

	private String getPackage(int id) {
		if (id >>> 24 == 1) {
			return "android:";
		}
		return "";
	}

	private float complexToFloat(int complex) {
		return (float) (complex & 0xFFFFFF00) * RADIX_MULTS[(complex >> 4) & 3];
	}

	private final float RADIX_MULTS[] = { 0.00390625F, 3.051758E-005F,
			1.192093E-007F, 4.656613E-010F };
	private final String DIMENSION_UNITS[] = { "px", "dip", "sp", "pt", "in",
			"mm", "", "" };
	private final String FRACTION_UNITS[] = { "%", "%p", "", "", "", "", "", "" };
	
	private final static Log log = LogFactory.getLog(ExtractAPK.class);