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[工作积累] NDK通过Java获取package name 和version
////////////////////////////////////////////////////////////////////////////Java code snippet//get APK‘s versionCode in AndroidManifest.xmlpublic int getVersionCode() {int versionCode = 1;try{PackageInfo packageInfo = this.getPackageManager().getPackageInfo(getPackageName(), 0);versionCode = packageInfo.versionCode;}catch (NameNotFoundException e) {Log.d(TAG, "cannot get package info.");}return versionCode;}
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// C code snippet: helper function to get package name from Java// --------------------------------------------------------------------static bool Android_GetPackageName(char* outPackageName, size_t length) { Android_App* app = Android_GetApp(); ANativeActivity*activity = app->activity; JNIEnv* env = activity->env; //note: we need to attach dalvik VM to current thread, as it is not main thread JavaVM* vm = activity->vm; if ( (*vm)->GetEnv(vm, (void **)&env, JNI_VERSION_1_6) < 0 ) (*vm)->AttachCurrentThread(vm, &env, NULL); //get package name from Activity Class(context) jclass android_content_Context = (*env)->GetObjectClass(env, activity->clazz); jmethodID midGetPackageName = (*env)->GetMethodID(env, android_content_Context, "getPackageName", "()Ljava/lang/String;"); jstring PackageName= (jstring)(*env)->CallObjectMethod(env, activity->clazz, midGetPackageName); bool ret = false; if( PackageName != null ) { //jchar is UTF16 jsize len = (*env)->GetStringLength(env, PackageName); const jchar* jcharBuff = (*env)->GetStringChars(env, PackageName, NULL); //Copy jcharBuff to outPckageName with code conversion(UTF16 to UTF8) #error do code conversion (*env)->DeleteLocalRef(env, PackageName); } (*env)->DeleteLocalRef(env, android_content_Context); return ret;}// --------------------------------------------------------------------// helper function to get package version code from Java// --------------------------------------------------------------------static int Android_GetVersionCode() { Android_App* app = Android_GetApp(); ANativeActivity*activity = app->activity; //get version code from Java JNIEnv* env = activity->env; //note: we need to attach dalvik VM to current thread, as it is not main thread JavaVM* vm = activity->vm; if ( (*vm)->GetEnv(vm, (void **)&env, JNI_VERSION_1_6) < 0 ) (*vm)->AttachCurrentThread(vm, &env, NULL); jclass ActivityClass = (*env)->GetObjectClass(env, activity->clazz); jmethodID java_method = (*env)->GetMethodID(env, ActivityClass, (char8*)"getVersionCode", (char8*)"()I"); assert( java_method != NULL ); jint ret = (*env)->CallIntMethod(env, activity->clazz , java_method); (*env)->DeleteLocalRef(env, ActivityClass); return (int)ret;}
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