1.定义native增量更新方法
public class PatchUtils {
/**
* @param oldApkPath 原来的本地安装的apk路径
* @param newApkPath 与差分包合并后新的apk路径
* @param patchPath 差分包路径，从服务器下载下来
*/
public static native void patch(String oldApkPath, String newApkPath,
String patchPath);
}
rebulid项目，进入项目\app\build\intermediates\classes\debug目录下，执行
javah (项目名).PatchUtils(例如rc.loveq.patchupdatedemo.utils.PatchUtils) 此时在app\build\intermediates\classes\debug生成.h头文件
2.将生成的.h头文件复制到jni目录下，将bsdiff和bzip里面的的C文件和.h文件复制到jni目录下
3.修改CMakeLists，修改生成的so的名字改为bspatch，修改编译的入口改为bspatch.c
4.这时运行是编译不通过的，需要修改bspatch.c，将#include <bzlib.h>改成#include "bzlib.h"，另外要引入
#include "bzlib.c"
#include "crctable.c"
#include "compress.c"
#include "decompress.c"
#include "randtable.c"
#include "blocksort.c"
#include "huffman.c"
以上文件。
5.经过上面几步，运行项目可以正常运行了，另外可以在\app\build\intermediates\cmake\debug\obj目录下，看到生成了对应的libbspatch.so文件。
6.接下来实现patch的native方法，bspatch.c引入#include "rc_loveq_patchupdatedemo_utils_PatchUtils.h"头文件，将main方法改为patch，编写patch的native方法
JNIEXPORT void JNICALL Java_rc_loveq_patchupdatedemo_utils_PatchUtils_patch
(JNIEnv *env, jclass jclz, jstring old_apk_path, jstring new_apk_path,
jstring patch_path){
// 1.封装参数
int argc = 4;
char * argv[4];
// 1.1 转换 jstring -> char*
char* old_pak_cstr = (char*)(*env)->GetStringUTFChars(env,old_apk_path,NULL);
char* new_apk_cstr = (char*)(*env)->GetStringUTFChars(env,new_apk_path,NULL);
char* patch_cstr = (char*)(*env)->GetStringUTFChars(env,patch_path,NULL);
// 第0的位置随便给
argv[0] = "combine";
argv[1] = old_pak_cstr;
argv[2] = new_apk_cstr;
argv[3] = patch_cstr;
// 2.调用上面的方法 int argc,char * argv[]
patch(argc,argv);
// 3.释放资源
(*env)->ReleaseStringUTFChars(env,old_apk_path,old_pak_cstr);
(*env)->ReleaseStringUTFChars(env,new_apk_path,new_apk_cstr);
(*env)->ReleaseStringUTFChars(env,patch_path,patch_cstr);
}
7.java层调用patch方法
public void patch(View view) {
//1.访问后台，是否需要更新版本
//2.需要更新版本，提示下载
//3.下载完成差分之后，调用patch方法合成新的apk
if (!new File(mPatchPath).exists()) {
return;
}
//这是一个耗时操作应该新开一个线程处理
PatchUtils.patch(getPackageResourcePath(), mNewApkPath, mPatchPath);
//4.校验签名
String v1Signature = SignatureUtils.getSignature(this);
mTvV1Signature.setText(v1Signature);
try {
String v2signature = SignatureUtils.getSignature(mNewApkPath);
mTvV2Signature.setText(v2signature);
boolean isEqual = TextUtils.equals(v1Signature, v2signature);
mTvV1V2IsEqual.setText("isEqual :" + isEqual);
} catch (Exception e) {
e.printStackTrace();
}
//5.安装最新版本
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(new File(mNewApkPath)),
"application/vnd.android.package-archive");
startActivity(intent);
}
8.最后服务器生成差分包
bsdiff old.apk new.apk patch.patch
服务器合成差分包
bspatch old.apk new.apk patch.patch
9.签名校验
public class SignatureUtils {
private static final String TAG = "SignatureUtils";
/**
* 获取当前apk的签名
*
* @param context
* @return
*/
public static String getSignature(Context context) {
// 通过Context获取当前包名
String currentApkPackageName = context.getApplicationInfo().packageName;
Log.e(TAG, "TAG -> " + currentApkPackageName);
// 通过PackageManager获取所有应用的PackageInfo信息
PackageManager packageManager = context.getPackageManager();
List<PackageInfo> packageInfos = packageManager.getInstalledPackages(PackageManager.GET_SIGNATURES);
for (PackageInfo packageInfo : packageInfos) {
if (packageInfo.packageName.equals(currentApkPackageName)) {
// 获取签名
return packageInfo.signatures[0].toCharsString();
}
}
return null;
}
/**
* 获取该目录下的apk签名
*
* @param path 当前apk路径
* @return
*/
public static String getSignature(String path) throws Exception {
// 1.反射实例化PackageParser对象
Object packageParser = getPackageParser(path);
// 2.反射获取parsePackage方法
Object packageObject = getPackageInfo(path, packageParser);
// 3.调用collectCertificates方法
Method collectCertificatesMethod = packageParser.getClass().
getDeclaredMethod("collectCertificates", packageObject.getClass(), int.class);
collectCertificatesMethod.invoke(packageParser, packageObject, 0);
// 4.获取mSignatures属性
Field signaturesField = packageObject.getClass().getDeclaredField("mSignatures");
signaturesField.setAccessible(true);
Signature[] mSignatures = (Signature[]) signaturesField.get(packageObject);
return mSignatures[0].toCharsString();
}
/**
* 创建PackageParser.Package类，兼容5.0
*
* @param path
* @return
* @throws Exception
*/
private static Object getPackageInfo(String path, Object packageParser) throws Exception {
if (Build.VERSION.SDK_INT >= 21) {
Class<?>[] paramClass = new Class[2];
paramClass[0] = File.class;
paramClass[1] = int.class;
Method parsePackageMethod = packageParser.getClass().getDeclaredMethod("parsePackage", paramClass);
// 3.反射执行parsePackage方法
Object[] paramObject = new Object[2];
paramObject[0] = new File(path);
paramObject[1] = 0;
parsePackageMethod.setAccessible(true);
return parsePackageMethod.invoke(packageParser, paramObject);
} else {
Class<?>[] paramClass = new Class[4];
paramClass[0] = File.class;
paramClass[1] = String.class;
paramClass[2] = DisplayMetrics.class;
paramClass[3] = int.class;
Method parsePackageMethod = packageParser.getClass().getDeclaredMethod("parsePackage", paramClass);
// 3.反射执行parsePackage方法
Object[] paramObject = new Object[4];
paramObject[0] = new File(path);
paramObject[1] = path;
DisplayMetrics metrics = new DisplayMetrics();
metrics.setToDefaults();
paramObject[2] = metrics;
paramObject[3] = 0;
parsePackageMethod.setAccessible(true);
return parsePackageMethod.invoke(packageParser, paramObject);
}
}
/**
* 创建PackageParser类
*
* @param path
* @return
* @throws Exception
*/
private static Object getPackageParser(String path) throws Exception {
Class<?> packageParserClazz = Class.forName("android.content.pm.PackageParser");
// 版本兼容
if (Build.VERSION.SDK_INT >= 21) {
Constructor<?> packageParserConstructor = packageParserClazz.getDeclaredConstructor();
return packageParserConstructor.newInstance();
} else {
Constructor<?> packageParserConstructor = packageParserClazz.getDeclaredConstructor(String.class);
return packageParserConstructor.newInstance(path);
}
}
}