创建覆盖其他应用程序的 Xamarin 应用程序

Creating Xamarin App with overlay over other Applications

我正在尝试创建一个 xamarin android 应用程序,它应该有一个小覆盖层 window,显示在其他应用程序之上。

很遗憾,我没有找到示例代码或文档。

我想要实现的是类似于 Apple 控制点、Facebook 聊天点或 google 地图导航叠加层的东西。

我的 phone 上还安装了一个简单的 makro 记录器应用程序,只要启用了“在其他应用程序之上绘制”的可访问性权限,它就可以执行此操作。

在上面的截图中你可以看到右侧的小录音控件。可以在屏幕上拖动控件叠加层、打开设置等。

有人知道怎么做吗?

此致,

朱利安

这是一个简单的示例,您可以参考。

创建一个FloatingService :

[Service]
class FloatingService : Service,Android.Views.View.IOnTouchListener
{
    WindowManagerLayoutParams layoutParams;
    IWindowManager windowManager;
    View floatView;
    public override void OnCreate()
    {
        base.OnCreate();
    }

    [return: GeneratedEnum]
    public override StartCommandResult OnStartCommand(Intent intent, [GeneratedEnum] StartCommandFlags flags, int startId)
    {
        showFloatingWindow();
        return StartCommandResult.NotSticky;
    }
    public override IBinder OnBind(Intent intent)
    {
        return null;
    }

    private void showFloatingWindow()
    {
        windowManager = GetSystemService(WindowService).JavaCast<IWindowManager>();
        LayoutInflater mLayoutInflater = LayoutInflater.From(ApplicationContext);
        floatView = mLayoutInflater.Inflate(Resource.Layout.floatview, null);
        floatView.SetBackgroundColor(Android.Graphics.Color.Transparent);
        floatView.SetOnTouchListener(this);
        ImageView iv1 = floatView.FindViewById<ImageView>(Resource.Id.iv1);
        ImageView iv2 = floatView.FindViewById<ImageView>(Resource.Id.iv2);
        ImageView iv3 = floatView.FindViewById<ImageView>(Resource.Id.iv3);
        iv1.Click += delegate { Toast.MakeText(ApplicationContext, "The first Image Click", ToastLength.Short).Show(); };
        iv2.Click += delegate { Toast.MakeText(ApplicationContext, "The second Image Click", ToastLength.Short).Show(); };
        iv3.Click += delegate { Toast.MakeText(ApplicationContext, "The third Image Click", ToastLength.Short).Show(); };
        
        // set LayoutParam
        layoutParams = new WindowManagerLayoutParams();
            if (Build.VERSION.SdkInt >= Build.VERSION_CODES.O)
            {
                layoutParams.Type = WindowManagerTypes.ApplicationOverlay;
            }
            else
            {
                layoutParams.Type = WindowManagerTypes.Phone;
            }
            layoutParams.Flags = WindowManagerFlags.NotTouchModal;
            layoutParams.Flags = WindowManagerFlags.NotFocusable;

            layoutParams.Width = 400;
            layoutParams.Height = 100;
            layoutParams.X = 300;
            layoutParams.Y = 300;
            windowManager.AddView(floatView, layoutParams);
            
        }
    private int x;
    private int y;
    public bool OnTouch(View v, MotionEvent e)
    {
        switch (e.Action)
        {
        
            case MotionEventActions.Down:
                x = (int)e.RawX;
                y = (int)e.RawY;
                break;

            case MotionEventActions.Move:
                int nowX = (int) e.RawX;
                int nowY = (int) e.RawY;
                int movedX = nowX - x;
                int movedY = nowY - y;
                x = nowX;
                y = nowY;
                layoutParams.X = layoutParams.X+ movedX;
                layoutParams.Y = layoutParams.Y + movedY;

        
            windowManager.UpdateViewLayout(floatView, layoutParams);
                break;

            default:
                break;
        }
        return false;
    }
}

floatview.xml :

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   android:orientation="horizontal"
   android:layout_width="wrap_content"
   android:layout_height="match_parent">

  <ImageView
    android:id="@+id/iv1"
    android:src="@android:drawable/ic_media_play"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"/>

  <ImageView
    android:id="@+id/iv2"
    android:src="@android:drawable/star_on"
    android:layout_marginLeft="10dp"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"/>
  <ImageView
    android:id="@+id/iv3"
    android:src="@android:drawable/ic_menu_more"
    android:layout_marginLeft="10dp"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"/>
</LinearLayout>

然后在你的 Activity 启动 FloatingService :

 button.Click += async delegate
      {
         if (!Settings.CanDrawOverlays(this))
          {
            StartActivityForResult(new Intent(Settings.ActionManageOverlayPermission, Android.Net.Uri.Parse("package:" + PackageName)), 0);
          }
         else
          {
            StartService(new Intent(this, typeof(FloatingService)));

          }
      }

 protected override void OnActivityResult(int requestCode, [GeneratedEnum] Result resultCode, Intent data)
    {
        if (requestCode == 0)
        {
            if (!Settings.CanDrawOverlays(this))
            {

            }
            else
            {
                StartService(new Intent(this, typeof(FloatingService)));
            }
        }
    }

并在 Manifest.xml 中添加 <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />

效果如下: