通过signature标识来确定文件标识；
补环境sd卡及根目录
package com.dta.lesson34;import com.github.unidbg.AndroidEmulator;import com.github.unidbg.Module;import com.github.unidbg.linux.android.AndroidEmulatorBuilder;import com.github.unidbg.linux.android.AndroidResolver;import com.github.unidbg.linux.android.dvm.*;import com.github.unidbg.memory.Memory;import java.io.File;import java.util.Arrays;public class MainActivity2 extends AbstractJni { private final AndroidEmulator emulator; private final VM vm; private final Memory memory; private final Module module; private final DvmObject<?> obj; public MainActivity2(){ emulator = AndroidEmulatorBuilder .for32Bit() //.setRootDir(new File("target/rootfs/default")) //.addBackendFactory(new DynarmicFactory(true)) .build(); memory = emulator.getMemory(); memory.setLibraryResolver(new AndroidResolver(23)); vm = emulator.createDalvikVM(new File("unidbg-android/src/test/java/com/dta/lesson34/DogLite.apk")); vm.setVerbose(true); vm.setJni(this); DalvikModule dalvikModule = vm.loadLibrary(new File("unidbg-android/src/test/java/com/dta/lesson34/libdoglite.so"), false); module = dalvikModule.getModule(); vm.callJNI_OnLoad(emulator,module); obj = vm.resolveClass("com/example/doglite/MainActivity").newObject(null); } public static void main(String[] args) { long start = System.currentTimeMillis(); MainActivity2 mainActivity = new MainActivity2(); System.out.println("load the vm "+( System.currentTimeMillis() - start )+ "ms");// mainActivity.SysInfo();// mainActivity.getAppFilesDir(); mainActivity.base64result(); } //public native void base64result(String str); private void base64result() { String input = "12345"; obj.callJniMethod(emulator,"base64result(Ljava/lang/String;)V",input); } private void getAppFilesDir() { obj.callJniMethod(emulator,"getAppFilesDir()V"); } private void SysInfo() { obj.callJniMethod(emulator,"SysInfo()V"); } @Override public DvmObject<?> callObjectMethodV(BaseVM vm, DvmObject<?> dvmObject, String signature, VaList vaList) { if (signature.equals("android/app/ActivityThread->getApplication()Landroid/app/Application;")){ return vm.resolveClass("android/app/Application").newObject(null); } if (signature.equals("java/io/File->getAbsolutePath()Ljava/lang/String;")){ String tag = dvmObject.getValue().toString(); if (tag.equals("android/os/Environment->getExternalStorageDirectory()Ljava/io/File;")){ return new StringObject(vm,"/sdcard/"); }else if (tag.equals("android/os/Environment->getStorageDirectory()Ljava/io/File;")){ return new StringObject(vm, "/"); } } return super.callObjectMethodV(vm, dvmObject, signature, vaList); } @Override public DvmObject<?> callStaticObjectMethodV(BaseVM vm, DvmClass dvmClass, String signature, VaList vaList) { if (signature.equals("android/provider/Settings$Secure->getString(Landroid/content/ContentResolver;Ljava/lang/String;)Ljava/lang/String;")){ String arg1 = vaList.getObjectArg(1).getValue().toString(); System.err.println("getString() arg1:"+arg1); return new StringObject(vm, "123456789"); } if (signature.equals("android/os/Environment->getExternalStorageDirectory()Ljava/io/File;")){ return vm.resolveClass("java/io/File").newObject(signature); } if (signature.equals("android/os/Environment->getStorageDirectory()Ljava/io/File;")){ return vm.resolveClass("java/io/File").newObject(signature); } if (signature.equals("android/util/Base64->encodeToString([BI)Ljava/lang/String;")){ byte[] input = (byte[]) vaList.getObjectArg(0).getValue(); int flag = vaList.getIntArg(1); String s = Base64.encodeToString(input, flag); return new StringObject(vm, s); } return super.callStaticObjectMethodV(vm, dvmClass, signature, vaList); }}来源地址：https://blog.csdn.net/weixin_38927522/article/details/127909506
