android悬浮窗的两种实现方案

第一种实现，不依赖于activity，使用系统级别的WindowManager来添加view：

 // 安卓8.0以上需要申请权限if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O && !Settings.canDrawOverlays(BaseApplication.getInstance())){   Intent intent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION);   startActivity(intent);   return;}WindowManager windowManager = (WindowManager) BaseApplication.getInstance().getSystemService(Context.WINDOW_SERVICE);WindowManager.LayoutParams layoutParams = new WindowManager.LayoutParams();// 设置宽高layoutParams.width = WindowManager.LayoutParams.MATCH_PARENT;layoutParams.height = WindowManager.LayoutParams.WRAP_CONTENT;// 设置背景透明layoutParams.format = PixelFormat.TRANSPARENT;// 设置屏幕左上角为起始点layoutParams.gravity = Gravity.LEFT | Gravity.TOP;// FLAG_LAYOUT_IN_SCREEN：将window放置在整个屏幕之内,无视其他的装饰(比如状态栏)； FLAG_NOT_TOUCH_MODAL：不阻塞事件传递到后面的窗口layoutParams.flags = WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN | WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL | WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH;if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {    layoutParams.type = WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY;} else {    // 设置窗体显示类型(TYPE_TOAST:与toast一个级别)    layoutParams.type = WindowManager.LayoutParams.TYPE_TOAST;}// 设置布局弹出的动画layoutParams.windowAnimations = R.style.anim;// 添加视图View contentView = LayoutInflater.from(BaseApplication.getInstance()).inflate(R.layout.content_view, null);windowManager.addView(contentView, layoutParams);

第二种实现，在应用内实现悬浮窗，需要依赖activity，可通过反射机制获取当前顶部窗口：

/** * 获取顶部activity * @return */private Activity getTopActivity() {    try {        Class activityThreadClass = Class.forName("android.app.ActivityThread");        Object activityThread = activityThreadClass.getMethod("currentActivityThread").invoke(null);        Field activitiesField = activityThreadClass.getDeclaredField("mActivities");        activitiesField.setAccessible(true);        Map activities = (Map) activitiesField.get(activityThread);        for (Object activityRecord : activities.values()) {            Class activityRecordClass = activityRecord.getClass();            Field pausedField = activityRecordClass.getDeclaredField("paused");            pausedField.setAccessible(true);            if (!pausedField.getBoolean(activityRecord)) {                Field activityField = activityRecordClass.getDeclaredField("activity");                activityField.setAccessible(true);                Activity activity = (Activity) activityField.get(activityRecord);                return activity;            }        }    } catch (Exception e) {        e.printStackTrace();    }    return null;}

// 在顶部窗口上面添加悬浮窗Activity activity = getTopActivity();View rootView = activity.getWindow().getDecorView().getRootView();ViewGroup contentView = rootView.findViewById(android.R.id.content);View floatView = LayoutInflater.from(BaseApplication.getInstance()).inflate(R.layout.float_view, null);// 添加视图contentView.addView(floatView);// 添加动画floatView.startAnimation(AnimationUtils.loadAnimation(floatView.getContext(), R.anim.anim));

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