Hanjie's Blog

sudo gedit ~/.bashrc

export ANDROID_SDK=<path to Android SDK directory>
export ANDROID_NDK=<path to Android NDK directory> 
export PATH=$PATH:$ANDROID_SDK/tools:$ANDROID_SDK/platform-tools:$ANDROID_NDK

source ~/.bashrc
ndk-build --version

GNU Make 4.2.1
Built for x86_64-pc-linux-gnu
Copyright (C) 1988-2016 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

cd /libusb/android/jni

ndk-build

package com.cvte.imagetracker;

import android.os.Bundle;

import java.io.DataOutputStream;

public class MainActivity extends UnityPlayerActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    public void GetRoot() {
        try {
            //通过执行su产生一个具有root权限的进程
            Process p = Runtime.getRuntime().exec("su");
            //然后，在向这个进程的写入要执行的命令，即可达到以root权限执行命令：
            DataOutputStream dos = new DataOutputStream(p.getOutputStream());
            dos.writeBytes( "\n");//cmd命令可为空
            dos.flush();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.cvte.imagetracker">

    <application>
        <!-- 这个android:name的值必须为包名+类名-->
        <activity android:name="com.cvte.imagetracker.MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>

            <!-- 这一行不能少，否则会闪退-->
            <meta-data android:name="unityplayer.UnityActivity" android:value="true" />
        </activity>
    </application>

</manifest>

apply plugin: 'com.android.library'

android {
    compileSdkVersion 30
    buildToolsVersion "30.0.2"

    defaultConfig {
        minSdkVersion 27
        targetSdkVersion 27
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
        consumerProguardFiles 'consumer-rules.pro'
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }

}

dependencies {
    implementation fileTree(include: ['*.jar'], dir: 'libs')
    implementation 'androidx.appcompat:appcompat:1.3.1'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
    implementation files('libs/classes.jar')
}


task deleteOldJar(type: Delete) {
    delete 'release/AndroidPlugin.jar'
}

//task to export contents as jar
task exportJar(type: Copy) {
    from('build/intermediates/aar_main_jar/release/')
    into('release/')
    include('classes.jar')
    ///Rename the jar
    rename('classes.jar', 'AndroidPlugin.jar')
}

exportJar.dependsOn(deleteOldJar, build)

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class test : MonoBehaviour
{
    // Start is called before the first frame update
    void Awake()
    {
        Debug.Log("==================");
        AndroidJavaObject activity = new AndroidJavaObject ("com.cvte.imagetracker.MainActivity");
        Debug.Log("GetRoot");
        activity.Call("GetRoot");
        Debug.Log("==================");
    }

    // Update is called once per frame
    void Update()
    {
        
    }

}