如何在android中创建浮动窗口

<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />

public class FloatingWindowService extends Service {
    private WindowManager windowManager;
    private View floatingView;

    @Override
    public void onCreate() {
        super.onCreate();
        // 初始化WindowManager
        windowManager = (WindowManager) getSystemService(WINDOW_SERVICE);
        // 创建浮动窗口布局
        floatingView = LayoutInflater.from(this).inflate(R.layout.floating_window_layout, null);
        // 设置浮动窗口的参数
        WindowManager.LayoutParams params = new WindowManager.LayoutParams(
                WindowManager.LayoutParams.WRAP_CONTENT,
                WindowManager.LayoutParams.WRAP_CONTENT,
                WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY,
                WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
                PixelFormat.TRANSLUCENT);
        // 设置浮动窗口的位置
        params.gravity = Gravity.TOP | Gravity.START;
        params.x = 0;
        params.y = 0;
        // 将浮动窗口添加到WindowManager
        windowManager.addView(floatingView, params);
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        // 移除浮动窗口
        if (floatingView != null) {
            windowManager.removeView(floatingView);
        }
    }

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }
}

<service
    android:name=".FloatingWindowService"
    android:enabled="true"
    android:exported="false" />

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">

    <!-- 浮动窗口的内容 -->

</RelativeLayout>

Intent intent = new Intent(context, FloatingWindowService.class);
context.startService(intent);