Add test activity

app/src/debug/AndroidManifest.xml

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:tools="http://schemas.android.com/tools"
+    xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <application tools:ignore="MissingApplicationIcon">
+        <activity
+            android:name=".TestActivity"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="de.robv.android.xposed.category.MODULE_SETTINGS" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

app/src/debug/java/io/github/lsposed/disableflagsecure/TestActivity.java

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+package io.github.lsposed.disableflagsecure;
+
+import android.app.Activity;
+import android.graphics.Paint;
+import android.os.Bundle;
+import android.view.SurfaceHolder;
+import android.view.SurfaceView;
+import android.view.WindowManager;
+import android.widget.LinearLayout;
+import android.widget.TextView;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+
+public class TestActivity extends Activity implements SurfaceHolder.Callback {
+    private TextView textView;
+    private SurfaceView surfaceView;
+    private final Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG) {{
+        setColor(0xFF00FFFF);
+    }};
+
+    @Override
+    protected void onCreate(@Nullable Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        getWindow().addFlags(WindowManager.LayoutParams.FLAG_SECURE);
+
+        var linearLayout = new LinearLayout(this);
+        linearLayout.setOrientation(LinearLayout.VERTICAL);
+        linearLayout.setBackgroundColor(0xFFFFFF00);
+        setContentView(linearLayout, new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT));
+
+        textView = new TextView(this);
+        linearLayout.addView(textView, new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT, 1.0f));
+
+        surfaceView = new SurfaceView(this);
+        surfaceView.setZOrderOnTop(true);
+        surfaceView.setSecure(true);
+        surfaceView.getHolder().addCallback(this);
+        linearLayout.addView(surfaceView, new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT, 1.0f));
+    }
+
+
+    @Override
+    public void surfaceCreated(@NonNull SurfaceHolder holder) {
+        var canvas = holder.lockCanvas();
+        canvas.drawRect(0, 0, surfaceView.getMeasuredWidth(), surfaceView.getMeasuredHeight(), paint);
+        textView.setText("SurfaceView");
+        textView.draw(canvas);
+        textView.setText("TextView");
+        holder.unlockCanvasAndPost(canvas);
+    }
+
+    @Override
+    public void surfaceChanged(@NonNull SurfaceHolder holder, int format, int width, int height) {
+
+    }
+
+    @Override
+    public void surfaceDestroyed(@NonNull SurfaceHolder holder) {
+
+    }
+}