kotlin写个toast练练手

新项目试试kotlin，学习中

经过测试设置了layoutparams.type =TYPE_SYSTEM_ERROR，MIUI没有权限显示不了toast，模拟器OK/不需要权限的type为TYPE_TOAST，但盖不住状态栏

效果图如下：

竖屏

1.png

横屏

2.png

代码

实现很简单，注释写的很清楚了就不用介绍了

/**
 * toast控件
 */
class MyToast private constructor(context: Context) {

    /**
     * toaste文字控件
     */
    private val textView: TextView

    /**
     * 懒加载toast
     */
    private val toast by lazy(LazyThreadSafetyMode.SYNCHRONIZED) { Toast(context) }


    init {
        /**
         * 设置顶部且宽度全屏
         */
        toast.setGravity(Gravity.FILL_HORIZONTAL or Gravity.TOP, 0, 0)

        textView = TextView(context)

        /**
         * 设置textview左边drawable
         */
        val drawable = context.resources.getDrawable(R.drawable.ic_toastinfo)
        drawable.setBounds(0,0,dp2px(40f),dp2px(40f))
        textView.setCompoundDrawables(drawable,null,null,null)
        textView.compoundDrawablePadding=dp2px(15f)

        /**
         * textview属性
         */
        textView.setBackgroundColor(0xFF79C4A0.toInt())
        textView.setTextSize(TypedValue.COMPLEX_UNIT_SP, 19f)
        textView.setTextColor((0xffffffff).toInt())
        textView.gravity = Gravity.CENTER
        val layoutParams = ViewGroup.MarginLayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT)
        textView.setPadding(dp2px(15f), dp2px(15f), dp2px(70f), dp2px(15f))
        layoutParams.setMargins(0, 0, 0, 0)
        textView.layoutParams = layoutParams

        toast.view = textView
        /**
         * 反射获取hide属性getWindowParams 设置盖住状态栏
         */
        try {
            val method = toast.javaClass.getDeclaredMethod("getWindowParams")
            val layoutParams1 = method.invoke(toast) as WindowManager.LayoutParams
            layoutParams1.type=WindowManager.LayoutParams.TYPE_SYSTEM_ERROR
        } catch (e: Exception) {
            e.printStackTrace()
        }
        /**
         * 设置可以显示到状态栏上
         */
        toast.view.systemUiVisibility = View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN

    }

    /**
     * 同伴对象
     */
    companion object {

        /**
         * 懒加载单例
         */
        private val myToast by lazy(LazyThreadSafetyMode.SYNCHRONIZED) { MyToast(App.app) }


        /**
         * 显示toast
         * @param text
         * @param during
         */
        fun showToaste(text: CharSequence, during: Int) {
            myToast.textView.text = text
            myToast.toast.duration = during
            myToast.toast.show()
        }
        /**
         * 显示toast
         * @param text
         * @param during
         */
        fun showToasteLong(text: CharSequence, during: Int) {
            showToaste(text,during)
            myToast.textView.postDelayed({ myToast.toast.show() },3000L)

        }

        /**
         * 取消toast
         */
        fun cancel(){
            myToast.toast.cancel()
        }
    }
}