Android點擊輸入框外使軟鍵盤退出

重寫Activity的dispatchTouchEvent方法

mBottomSend爲底部輸入框佈局

override fun dispatchTouchEvent(event: MotionEvent?): Boolean {
        event?.let {
            if (it.action == MotionEvent.ACTION_DOWN) {
                //判斷當前頁面是否已經彈出了軟鍵盤
                if (isKeyBoardShowing(context, mBottomSend)) {
                    var locations = intArrayOf(0, 0)
                    //計算輸入框距離屏幕左側和頂部的距離
                    mBottomSend.getLocationInWindow(locations)
                    val left = locations[0]
                    val top = locations[1]
                    val bottom = top + mBottomSend.height  //輸入框底部距離屏幕頂部距離
                    val right = left + mBottomSend.width //輸入框右側距離屏幕左側的距離
                    val rect = Rect(left, top, right, bottom)
                    //如果點擊的位置不在輸入框內，則隱藏底部的軟鍵盤
                    if (!rect.contains(it.x.toInt(), it.y.toInt())) {
                        hideKeyBoard(context, mBottomSend)
                    }
                }
            }
        }
        return super.dispatchTouchEvent(event)
    }

/**
* 隱藏軟鍵盤
*/
fun hideKeyBoard(context: Context, view: View) {
        val input = context.getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
        if (input.isActive()) {
            input.hideSoftInputFromWindow(view.getWindowToken(), 0)
        }
    }

     /**
     * 判斷軟鍵盤是否彈出
     */
 fun isKeyBoardShowing(context: Context, v: View): Boolean {
        val imm = context.getSystemService(context.INPUT_METHOD_SERVICE) as InputMethodManager
        if (imm.hideSoftInputFromWindow(v.getWindowToken(), 0)) {
            imm.showSoftInput(v, 0)
            return true
            //軟鍵盤已彈出
        } else {
            return false
            //軟鍵盤未彈出
        }
    }