增量更新工具类【https://github.com/cundong/SmartAppUpdates】

 import java.io.File;

 import android.app.Activity;

 import android.app.ProgressDialog;

 import android.content.Context;

 import android.content.Intent;

 import android.net.Uri;

 import android.os.AsyncTask;

 import android.os.Bundle;

 import android.text.TextUtils;

 import android.view.View;

 import android.view.View.OnClickListener;

 import android.widget.Button;

 import android.widget.TextView;

 import android.widget.Toast;

 import com.cundong.utils.PatchUtils;

 import com.example.test.util.ApkUtils;

 import com.example.test.util.SignUtils;

 import com.example.test2.R;

 /**

  * 类说明： ApkPatchLibrary 使用 Demo

  *

  * @author  Cundong

  * @version 1.5

  */

 public class MainActivity extends Activity {

     // 合成成功

     private static final int WHAT_SUCCESS = 1;

     // 合成的APK签名和已安装的签名不一致

     private static final int WHAT_FAIL_SING = -1;

     // 合成失败

     private static final int WHAT_FAIL_ERROR = -2;

     // 获取源文件失败

     private static final int WHAT_FAIL_GET_SOURCE = -3;

     private Context mContext = null;

     private ProgressDialog mProgressDialog;

     private TextView mResultView;

     private Button mStartButton, mGithubButton;

     private long mBeginTime, mEndTime;

     @Override

     protected void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.activity_main);

         mContext = getApplicationContext();

         mProgressDialog = new ProgressDialog(this);

         mProgressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);

         mProgressDialog.setMessage("doing..");

         mProgressDialog.setCancelable(false);

         mResultView = (TextView) findViewById(R.id.textview4);

         mStartButton = (Button) findViewById(R.id.start_btn);

         mGithubButton = (Button) findViewById(R.id.github_btn);

         mStartButton.setOnClickListener(new OnClickListener() {

             @Override

             public void onClick(View arg0) {

                 File patchFile = new File(Constants.PATCH_PATH);

                 if (!ApkUtils.isInstalled(mContext, Constants.TEST_PACKAGENAME)) {

                     Toast.makeText(mContext, getString(R.string.demo_info1),

                             Toast.LENGTH_LONG).show();

                 } else if (!patchFile.exists()) {

                     Toast.makeText(mContext, getString(R.string.demo_info2),

                             Toast.LENGTH_LONG).show();

                 } else {

                     new PatchApkTask().execute();

                 }

             }

         });

         mGithubButton.setOnClickListener(new OnClickListener() {

             @Override

             public void onClick(View v) {

                 Intent intent = new Intent("android.intent.action.VIEW", Uri.parse("https://github.com/cundong/SmartAppUpdates"));

                 startActivity(intent);

             }

         });

     }

     private class PatchApkTask extends AsyncTask<String, Void, Integer> {

         @Override

         protected void onPreExecute() {

             super.onPreExecute();

             mProgressDialog.show();

             mResultView.setText("");

             mBeginTime = System.currentTimeMillis();

         }

         @Override

         protected Integer doInBackground(String... params) {

             String oldApkSource = ApkUtils.getSourceApkPath(mContext,

                     Constants.TEST_PACKAGENAME);

             if (!TextUtils.isEmpty(oldApkSource)) {

                 int patchResult = PatchUtils.patch(oldApkSource,

                         Constants.NEW_APK_PATH, Constants.PATCH_PATH);

                 if (patchResult == 0) {

                     String signatureNew = SignUtils

                             .getUnInstalledApkSignature(Constants.NEW_APK_PATH);

                     String signatureSource = SignUtils

                             .getInstalledApkSignature(mContext,

                                     Constants.TEST_PACKAGENAME);

                     if (!TextUtils.isEmpty(signatureNew)

                             && !TextUtils.isEmpty(signatureSource)

                             && signatureNew.equals(signatureSource)) {

                         return WHAT_SUCCESS;

                     } else {

                         return WHAT_FAIL_SING;

                     }

                 } else {

                     return WHAT_FAIL_ERROR;

                 }

             } else {

                 return WHAT_FAIL_GET_SOURCE;

             }

         }

         @Override

         protected void onPostExecute(Integer result) {

             super.onPostExecute(result);

             if (mProgressDialog.isShowing()) {

                 mProgressDialog.dismiss();

             }

             mEndTime = System.currentTimeMillis();

             mResultView.setText("耗时: " + (mEndTime - mBeginTime) + "ms");

             switch (result) {

                 case WHAT_SUCCESS: {

                     String text = "新apk已合成成功：" + Constants.NEW_APK_PATH;

                     showShortToast(text);

                     ApkUtils.installApk(MainActivity.this, Constants.NEW_APK_PATH);

                     break;

                 }

                 case WHAT_FAIL_SING: {

                     String text = "新apk已合成失败，签名不一致";

                     showShortToast(text);

                     break;

                 }

                 case WHAT_FAIL_ERROR: {

                     String text = "新apk已合成失败";

                     showShortToast(text);

                     break;

                 }

                 case WHAT_FAIL_GET_SOURCE: {

                     String text = "无法获取packageName为" + Constants.TEST_PACKAGENAME

                             + "的源apk文件，只能整包更新了！";

                     showShortToast(text);

                     break;

                 }

             }

         }

     }

     private void showShortToast(final String text) {

         Toast.makeText(mContext, text, Toast.LENGTH_SHORT).show();

     }

     static {

         System.loadLibrary("ApkPatchLibrary");

     }

 }

APK 工具类

 import android.content.Context;

 import android.content.Intent;

 import android.content.pm.ApplicationInfo;

 import android.content.pm.PackageManager;

 import android.content.pm.PackageManager.NameNotFoundException;

 import android.net.Uri;

 import android.text.TextUtils;

 /**

  * 类说明：  Apk工具类

  *

  * @author     Cundong

  * @date     2013-9-6

  * @version 1.0

  */

 public class ApkUtils {

     public static boolean isInstalled(Context context, String packageName) {

         PackageManager pm = context.getPackageManager();

         boolean installed = false;

         try {

             pm.getPackageInfo(packageName, PackageManager.GET_ACTIVITIES);

             installed = true;

         } catch (Exception e) {

             e.printStackTrace();

         }

         return installed;

     }

     /**

      * 获取已安装Apk文件的源Apk文件

      * 如：/data/app/com.sina.weibo-1.apk

      *

      * @param context

      * @param packageName

      * @return

      */

     public static String getSourceApkPath(Context context, String packageName) {

         if (TextUtils.isEmpty(packageName))

             return null;

         try {

             ApplicationInfo appInfo = context.getPackageManager()

                     .getApplicationInfo(packageName, 0);

             return appInfo.sourceDir;

         } catch (NameNotFoundException e) {

             e.printStackTrace();

         }

         return null;

     }

     /**

      * 安装Apk

      *

      * @param context

      * @param apkPath

      */

     public static void installApk(Context context, String apkPath) {

         Intent intent = new Intent(Intent.ACTION_VIEW);

         intent.setDataAndType(Uri.parse("file://" + apkPath),

                 "application/vnd.android.package-archive");

         context.startActivity(intent);

     }

 }

apk 签名信息获取工具类

 import java.io.File;

 import java.lang.reflect.Constructor;

 import java.lang.reflect.Field;

 import java.lang.reflect.Method;

 import java.util.Iterator;

 import java.util.List;

 import android.content.Context;

 import android.content.pm.PackageInfo;

 import android.content.pm.PackageManager;

 import android.content.pm.Signature;

 import android.util.DisplayMetrics;

 /**

  * 类说明：  apk 签名信息获取工具类

  *

  * @author     Cundong

  * @date     2013-9-6

  * @version 1.0

  */

 public class SignUtils {

     /**

      * 获取未安装Apk的签名

      *

      * @param apkPath

      * @return

      */

     public static String getUnInstalledApkSignature(String apkPath) {

         String PATH_PackageParser = "android.content.pm.PackageParser";

         try {

             Class<?> pkgParserCls = Class.forName(PATH_PackageParser);

             Class<?>[] typeArgs = new Class[1];

             typeArgs[0] = String.class;

             Constructor<?> pkgParserCt = pkgParserCls.getConstructor(typeArgs);

             Object[] valueArgs = new Object[1];

             valueArgs[0] = apkPath;

             Object pkgParser = pkgParserCt.newInstance(valueArgs);

             DisplayMetrics metrics = new DisplayMetrics();

             metrics.setToDefaults();

             typeArgs = new Class[4];

             typeArgs[0] = File.class;

             typeArgs[1] = String.class;

             typeArgs[2] = DisplayMetrics.class;

             typeArgs[3] = Integer.TYPE;

             Method pkgParser_parsePackageMtd = pkgParserCls.getDeclaredMethod(

                     "parsePackage", typeArgs);

             valueArgs = new Object[4];

             valueArgs[0] = new File(apkPath);

             valueArgs[1] = apkPath;

             valueArgs[2] = metrics;

             valueArgs[3] = PackageManager.GET_SIGNATURES;

             Object pkgParserPkg = pkgParser_parsePackageMtd.invoke(pkgParser,

                     valueArgs);

             typeArgs = new Class[2];

             typeArgs[0] = pkgParserPkg.getClass();

             typeArgs[1] = Integer.TYPE;

             Method pkgParser_collectCertificatesMtd = pkgParserCls

                     .getDeclaredMethod("collectCertificates", typeArgs);

             valueArgs = new Object[2];

             valueArgs[0] = pkgParserPkg;

             valueArgs[1] = PackageManager.GET_SIGNATURES;

             pkgParser_collectCertificatesMtd.invoke(pkgParser, valueArgs);

             Field packageInfoFld = pkgParserPkg.getClass().getDeclaredField(

                     "mSignatures");

             Signature[] info = (Signature[]) packageInfoFld.get(pkgParserPkg);

             return info[0].toCharsString();

         } catch (Exception e) {

             e.printStackTrace();

         }

         return null;

     }

     /**

      * 获取已安装apk签名

      *

      * @param context

      * @param packageName

      * @return

      */

     public static String getInstalledApkSignature(Context context,

             String packageName) {

         PackageManager pm = context.getPackageManager();

         List<PackageInfo> apps = pm

                 .getInstalledPackages(PackageManager.GET_SIGNATURES);

         Iterator<PackageInfo> iter = apps.iterator();

         while (iter.hasNext()) {

             PackageInfo packageinfo = iter.next();

             String thisName = packageinfo.packageName;

             if (thisName.equals(packageName)) {

                 return packageinfo.signatures[0].toCharsString();

             }

         }

         return null;

     }

 }

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