使用 Application 创建后显示 bubble 时报错

[pansong291]

我是在一个全局悬浮窗里面添加的这个组件，所以没有 Activity，当开始拖动时，报错：

android.view.WindowManager$BadTokenException: Unable to add window -- token null is not valid; is your activity running?
    at android.view.ViewRootImpl.setView(ViewRootImpl.java:798)
    at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:356)
    at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:93)
    at com.xw.repo.BubbleSeekBar$7.onAnimationStart(BubbleSeekBar.java:1020)
    at android.view.ViewPropertyAnimator$AnimatorEventListener.onAnimationStart(ViewPropertyAnimator.java:1090)
    at android.animation.Animator$AnimatorListener.onAnimationStart(Animator.java:536)
    at android.animation.ValueAnimator.notifyStartListeners(ValueAnimator.java:1013)
    at android.animation.ValueAnimator.startAnimation(ValueAnimator.java:1262)
    at android.animation.ValueAnimator.start(ValueAnimator.java:1064)
    at android.animation.ValueAnimator.start(ValueAnimator.java:1088)
    at android.view.ViewPropertyAnimator.startAnimation(ViewPropertyAnimator.java:904)
    at android.view.ViewPropertyAnimator.start(ViewPropertyAnimator.java:416)
    at com.xw.repo.BubbleSeekBar.showBubble(BubbleSeekBar.java:1022)
    at com.xw.repo.BubbleSeekBar.onTouchEvent(BubbleSeekBar.java:695)

[pansong291]

主要变更：

if (context instanceof Application) {
    // 使用全局悬浮窗
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        mLayoutParams.type = WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY;
    } else {
        mLayoutParams.type = WindowManager.LayoutParams.TYPE_SYSTEM_ALERT;
    }
} else {
    // MIUI禁止了开发者使用TYPE_TOAST，Android 7.1.1 对TYPE_TOAST的使用更严格
    if (BubbleUtils.isMIUI() || Build.VERSION.SDK_INT >= Build.VERSION_CODES.N_MR1) {
        mLayoutParams.type = WindowManager.LayoutParams.TYPE_APPLICATION;
    } else {
        mLayoutParams.type = WindowManager.LayoutParams.TYPE_TOAST;
    }
}