安卓逆向系列补充(二)

import androidx.appcompat.app.AppCompatActivity;import android.content.Context;import android.os.Bundle;import android.util.Log;import java.io.File;import java.lang.reflect.InvocationTargetException;import java.lang.reflect.Method;import dalvik.system.DexClassLoader;public class MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);      ClassLoader classLoader = MainActivity.class.getClassLoader();        Log.i("test Classloader","app=>"+classLoader);        ClassLoader parentloader = null;        parentloader = classLoader.getParent();        while (parentloader!=null){            Log.i("test classloader","this"+classLoader+"parentclassloader"+parentloader);            classLoader = parentloader;            parentloader = classLoader.getParent();        }        Log.i("test","root=>"+classLoader);

import android.Manifest;import androidx.appcompat.app.AppCompatActivity;import androidx.core.content.ContextCompat;import android.content.Context;import android.os.Bundle;import android.util.Log;import android.os.Build;import java.io.File;import java.lang.reflect.InvocationTargetException;import java.lang.reflect.Method;import android.content.pm.PackageManager;import android.os.Build;import androidx.annotation.NonNull;import androidx.core.app.ActivityCompat;import androidx.core.content.ContextCompat;import dalvik.system.DexClassLoader;import androidx.annotation.NonNull;public class MainActivity extends AppCompatActivity {    private static final int REQUEST_CODE = 1;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);//      ClassLoader classLoader = MainActivity.class.getClassLoader();//        Log.i("test Classloader","app=>"+classLoader);//        ClassLoader parentloader = null;//        parentloader = classLoader.getParent();//        while (parentloader!=null){//            Log.i("test classloader","this"+classLoader+"parentclassloader"+parentloader);//            classLoader = parentloader;//            parentloader = classLoader.getParent();////        }//        Log.i("test","root=>"+classLoader);        checkAndRequestPermissions();        Context context = this.getApplicationContext();        testClassLoader(context,"/sdcard/3.dex");    }    private void checkAndRequestPermissions() {        if (ContextCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE)                != PackageManager.PERMISSION_GRANTED || ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE)                != PackageManager.PERMISSION_GRANTED) {            ActivityCompat.requestPermissions(this,                    new String[]{Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.WRITE_EXTERNAL_STORAGE},                    REQUEST_CODE);        }    }    @Override    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {        super.onRequestPermissionsResult(requestCode, permissions, grantResults);        if (requestCode == REQUEST_CODE) {            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {                // 权限被授予，可以进行读写操作            } else {                // 权限被拒绝，处理相应逻辑            }        }    }    public void testClassLoader(Context context,String dexfilepath){        File optFile = context.getDir("opt_dex",0);        File libFile = context.getDir("lib_path",0);        ClassLoader parentClassloader = MainActivity.class.getClassLoader();        ClassLoader tmpClassloader = context.getClassLoader();        DexClassLoader dexClassLoader = new DexClassLoader(dexfilepath,optFile.getAbsolutePath(),libFile.getAbsolutePath(),MainActivity.class.getClassLoader());        Class<?> clazz = null;        try {            clazz =dexClassLoader.loadClass("com.r0ysue.testapp6.test02");        } catch (ClassNotFoundException e) {            e.printStackTrace();        }        if (clazz!=null){            try {                Method testFunction = clazz.getDeclaredMethod("testFun");                Object obj = clazz.newInstance();                testFunction.invoke(obj);            } catch (NoSuchMethodException e) {                e.printStackTrace();            } catch (IllegalAccessException e) {                e.printStackTrace();            } catch (InstantiationException e) {                e.printStackTrace();            } catch (InvocationTargetException e) {                e.printStackTrace();            }        }    }}

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.r0ysue.testapp05">    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"></uses-permission>    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>    <uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE" />    <application        android:allowBackup="true"        android:icon="@mipmap/ic_launcher"        android:label="@string/app_name"        android:roundIcon="@mipmap/ic_launcher_round"        android:supportsRtl="true"        android:theme="@style/Theme.TestAPP05">        <activity android:name=".MainActivity">            android:hardwareAccelerated="false"            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>    </application></manifest>

plugins {    id 'com.android.application'}android {    compileSdkVersion 33    defaultConfig {        applicationId "com.r0ysue.testapp05"        minSdkVersion 21        targetSdkVersion 33        versionCode 1        versionName "1.0"        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"    }    buildTypes {        release {            minifyEnabled false            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'        }    }    compileOptions {        sourceCompatibility JavaVersion.VERSION_1_8        targetCompatibility JavaVersion.VERSION_1_8    }}dependencies {    implementation 'androidx.appcompat:appcompat:1.3.0'    implementation 'com.google.android.material:material:1.4.0'    implementation 'androidx.annotation:annotation:1.1.0'    implementation 'androidx.constraintlayout:constraintlayout:2.1.0'//    implementation 'androidx.lifecycle:lifecycle-livedata-ktx:2.2.0'//    implementation 'androidx.lifecycle:lifecycle-viewmodel-ktx:2.2.0'    testImplementation 'junit:junit:4.+'    androidTestImplementation 'androidx.test.ext:junit:1.1.3'    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.1'}