show window in app_process (impossible to work from Android 14 QPR 3 or Android 15, as addView requires the calling process an Android app process)

gistfile1.txt

 token = new Binder();
        try {
            Context _context = android.app.ActivityThread.systemMain().getSystemContext();
            final Context context = new ContextWrapper(_context) {
                @Override
                public Object getSystemService(String name) {
                    if (Context.WINDOW_SERVICE.equals(name)) {
                        WindowManager wm = (WindowManager) super.getSystemService(name);
                        if (wm != null) {
                            ((android.view.WindowManagerImpl) wm).setDefaultToken(token);
                        }
                        return wm;
                    }
                    return super.getSystemService(name);
                }
            };
            context.setTheme(android.R.style.Theme_Material_Light);

            CharSequence label = context.getPackageManager().getApplicationLabel(context.getPackageManager().getApplicationInfo("com.android.settings", 0));
            LogUtils.i("label " + label);

            android.widget.Toast.makeText(context, "test", Toast.LENGTH_LONG).show();
            LogUtils.i("toast");

            android.view.WindowManager wm = context.getSystemService(WindowManager.class);
            LogUtils.i("class: " + wm.getClass().getName());

            //((android.view.WindowManagerImpl) wm).setDefaultToken(token);
            LinearLayout root = new LinearLayout(context);
            root.setBackground(new ColorDrawable(0xffffffff));
            TextView textView = new TextView(context);
            textView.setText("test");
            root.addView(textView);
            Button button = new Button(context);
            button.setSoundEffectsEnabled(false);
            button.setText("test");
            button.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    Toast.makeText(context, "?!", Toast.LENGTH_LONG).show();
                }
            });
            root.addView(button);

            WindowManager.LayoutParams params = new WindowManager.LayoutParams(
                    WindowManager.LayoutParams.WRAP_CONTENT,
                    WindowManager.LayoutParams.WRAP_CONTENT,
                    WindowManager.LayoutParams.TYPE_SYSTEM_DIALOG,
                    WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL,
                    PixelFormat.TRANSLUCENT);

            params.gravity = Gravity.CENTER;
            params.x = 0;
            params.y = 0;
            wm.addView(root, params);
        } catch (Throwable tr) {
            LogUtils.e(tr.getMessage(), tr);
        }

@huynhtanloc2612, the following works for me, I tested it in ADB as well.

$ adb shell app_process -cp /data/local/tmp/toast.dex /system/bin/ { class/package path }.ShowToast

public class ShowToast {
  public static final void main(String[] args) {
    Looper.prepare();

    ActivityThread activityThread = ActivityThread.systemMain();

    Context _context = activityThread.getSystemContext();
    Context context = new ContextWrapper(_context) {
      @Override
      public String getOpPackageName() {
        return "com.android.shell";
      }
    };

    // Maybe create a `new Handler(Looper.myLooper())` and wrap this
    // in `handler.post(() -> { ... }); Looper.loop();` if it doesn't work?
    // If you do, don't forget to add `Looper.myLooper().quit[Safely]()`
    // inside the `handler.post(() -> { ... });`.
    Toast.makeText(context, "test", Toast.LENGTH_LONG).show();
  }
}

If that doesn't work, maybe try something like this for creating and wrapping the context:

  static Context createPackageContext(String packageName) {
    Context sysCtx = ActivityThread.systemMain().getSystemContext();

    Context _context;
    try {
      _context = (Context) Context.class
        .getMethod("createPackageContextAsUser", new Class[] {
          String.class,
          int.class,
          UserHandle.class })
        .invoke(sysCtx, packageName, 0, Process.myUserHandle());
    } catch (Exception exc) {
      throw new RuntimeException(exc);
    }

    return new ContextWrapper(_context) {
      @Override
      public String getOpPackageName() {
        return packageName;
      }
    };
  }

What device are you using? I see you're using a Galaxy. That could make a difference, but I'm not sure. I'm using a Google Pixel 8 Pro.

Thanks @JacobTDC ,
Try your above suggestions but the same error happens when it executes Toast.makeText(...).show()
java.lang.SecurityException: Given calling package android does not match caller's uid 2000

I think it requires Android app process as the note of @RikkaW "addView requires the calling process an Android app process"

https://github.com/enenH/AndroidNativeDrawPlus/blob/main/draw/src/main/java/com/example/draw/Main.java

Check this, maybe help