Android外部imgui绘制--JNIRoot

前几天听说了个 jniroot, 貌似很厉害的样子
https://github.com/topjohnwu/libsu

想着能不能适配 imgui.
干就完事了.

改进后的 libsu 模板在这里
https://github.com/PShocker/libsutemplate

1. 新建 Native C++ 项目，把 libsu 的依赖全部加进去

android {
    compileOptions {
        // This library uses Java 8 features, this is required
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
}
repositories {
    maven { url 'https://jitpack.io' }
}
dependencies {
    def libsuVersion = '4.0.3'

    // The core module is used by all other components
    implementation "com.github.topjohnwu.libsu:core:${libsuVersion}"

    // Optional: APIs for creating root services
    implementation "com.github.topjohnwu.libsu:service:${libsuVersion}"

    // Optional: For com.topjohnwu.superuser.io classes
    implementation "com.github.topjohnwu.libsu:io:${libsuVersion}"

    // Optional: Bundle prebuilt BusyBox binaries
    implementation "com.github.topjohnwu.libsu:busybox:${libsuVersion}"
}

若报错，把 maven { url ‘https://jitpack.io’ } 添加到 settings.gradle 里

dependencyResolutionManagement {
    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
    repositories {
        google()
        mavenCentral()
        maven { url 'https://jitpack.io' }
    }
}

2. 新建 aidl 文件，Rebuild 生成 Stub 文件

interface IImGuiService {
    /**
     * Demonstrates some basic types that you can use as parameters
     * and return values in AIDL.
     */
    void init_ImGui(inout Surface surface);
    void update_ImGui(int width, int height);
    void set_ImGui_Orientation(int orientation);
}

新建 AIDLService 类，继承 RootService.

class AIDLService extends RootService {

    static {
        // Only load the library when this class is loaded in a root process.
        // The classloader will load this class (and call this static block) in the non-root
        // process because we accessed it when constructing the Intent to send.
        // Add this check so we don't unnecessarily load native code that'll never be used.
        if (Process.myUid() == 0)
            System.loadLibrary("imgui");
    }

    public  native void native_init_ImGui(Surface surface); //imgui初始化,读取输入,渲染.
    public  native void native_update_ImGui(int width, int height);
    public  native void native_set_ImGui_Orientation(int orientation); //设置屏幕方向


    class ImGui extends IImGuiService.Stub {

        @Override
        public void init_ImGui(Surface surface) throws RemoteException {
            native_init_ImGui(surface);
        }

        @Override
        public void update_ImGui(int width, int height) throws RemoteException {
            native_update_ImGui(width,height);
        }


        @Override
        public void set_ImGui_Orientation(int orientation) throws RemoteException {
            native_set_ImGui_Orientation(orientation);
        }
    }

    @Override
    public IBinder onBind(@NonNull Intent intent) {
        return new ImGui();
    }
}

3. 新建 ImGuiView 类

class ImGuiView extends SurfaceView implements SurfaceHolder.Callback{
   public ImGuiView(Context context) {
      super(context);
      setZOrderOnTop(true);
      SurfaceHolder holder = getHolder();
      holder.setFormat(PixelFormat.TRANSLUCENT);
      getHolder().addCallback(this);
      setFocusable(true);
      setFocusableInTouchMode(true);
      requestFocus();
      requestFocusFromTouch();
   }

   @Override
   public void surfaceCreated(@NonNull SurfaceHolder surfaceHolder) {
      Log.d("Shocker","surfaceCreated"); //这里需要新线程在native里完成初始化,读取输入和渲染
         new Thread(new Runnable() {
            @Override
            public void run() {
               try {
                  MainActivity.ImGui.init_ImGui(surfaceHolder.getSurface());
               } catch (RemoteException e) {
                  e.printStackTrace();
               }
            }
         }).start();
   }

   @Override
   public void surfaceChanged(@NonNull SurfaceHolder surfaceHolder, int i, int i1, int i2) {
       ....... //处理屏幕旋转事件
   }

   @Override
   public void surfaceDestroyed(@NonNull SurfaceHolder surfaceHolder) {

   }
}

4. 新建 AIDLConnection 类，在 MainActivity 的 OnCreate 里绑定 RootService

public static IImGuiService ImGui;
class AIDLConnection implements ServiceConnection {

        private final boolean isDaemon;

        AIDLConnection(boolean b) {
            isDaemon = b;
        }

        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            ImGui= IImGuiService.Stub.asInterface(service);
            Log.d("Shocker","Connected");
        }

        @Override
        public void onServiceDisconnected(ComponentName componentName) {
            Log.d("Shocker","Disconnected");

        }
    }

protected void addFullView() {
    ImGuiView imGuiView=new ImGuiView(this);
    params = new WindowManager.LayoutParams(
            getLayoutType(),
            WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE | WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE
                    | WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL | WindowManager.LayoutParams.FLAG_FULLSCREEN,
            PixelFormat.TRANSLUCENT);
    params.gravity = Gravity.LEFT | Gravity.TOP;		// 调整悬浮窗显示的停靠位置为左侧置顶

    params.systemUiVisibility = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION|View.SYSTEM_UI_FLAG_FULLSCREEN |
            View.SYSTEM_UI_FLAG_LAYOUT_STABLE|View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION |
            View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN |
            View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY;

    // 以屏幕左上角为原点，设置x、y初始值（10,10），相对于gravity
    params.x = 0;
    params.y = 0;
    // 设置悬浮窗口长宽数据
    params.width  = WindowManager.LayoutParams.MATCH_PARENT;
    params.height = WindowManager.LayoutParams.MATCH_PARENT;
    if (Build.VERSION.SDK_INT >= 28) {
        params.layoutInDisplayCutoutMode = WindowManager.LayoutParams.LAYOUT_IN_DISPLAY_CUTOUT_MODE_SHORT_EDGES ;
    }
    windowManager.addView(imGuiView, params);
}

@Override
    protected void onCreate(Bundle savedInstanceState) {
        ..............
        RootService.bind(new Intent(this, AIDLService.class), new AIDLConnection(false));
        t.setOnClickListener(view -> {
            if (!start){
                addFullView(); //添加悬浮窗
                start=true;
            }
        });
    }

5.native 完成 imgui 初始化，循环读取输入和渲染

Java_com_shocker_imgui_AIDLService_native_1init_1ImGui(JNIEnv *env, jobject thiz, jobject surface) {
    ANativeWindow* w = ANativeWindow_fromSurface(env, (jobject)surface);
    init(w); //初始化imgui
    ANativeWindow_release(w);

    while (true){
        handleInputEvent();
        tick();
    }
}