Android之页面有变化用onWindowFocusChanged来监听权限是否开启

1 问题

我们需要在Activity里面监听网络变化、热点是否开启和关闭、GPS服务是否开启、位置权限是否开启等一些列行为。

2 思路

方法一：

如果是需要启动activity进行权限申请，我们可以用如下组合模式

        var intent = Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS)
        startActivityForResult(intent, REQUEST_GPS_CODE)


override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        super.onActivityResult(requestCode, resultCode, data)
        Log.i(TAG, "onActivityResult start requestCode is:" + requestCode)
        //Android8.0以上版本
        if (requestCode == REQUEST_GPS_CODE) { 

       }
}

方法二：

我们在onResume里面进行权限检测

方法三：

注册广播来进行监听

方法四：

利用handler.postDelayed实现定时器，然后定时检测权限

    /**
     * 检查是否满足条件让按钮变蓝色的定时器
     */
    inner class CheckCondition : Runnable {
        var context: Context? = null
        var type: String? = null
        constructor(context: Context, type: String) {
            this.context = context
            this.type = type
        }
        override fun run() {
            var result = false
            result = condition(type!!)
            Log.i(TAG, "CheckCondition result is:$result")
            if (result) {
                nextCreateWifAp.isEnabled = true
            } else {
                nextCreateWifAp.isEnabled = false
            }
            handler!!.postDelayed(this, 1000)
        }
    }

            checkCondition = CheckCondition(this, ANDROID_VERSION_SIX_TO_SEVEN)
            handler.postDelayed(checkCondition, TIME_TITERVAL)

方法五：

 在onWindowFocusChanged函数里面检测，比如切换页面，滑动菜单栏，都能触发到，方案最理想，基本上能满足你的需求。

    override fun onWindowFocusChanged(hasFocus: Boolean) {
        super.onWindowFocusChanged(hasFocus)
        Log.i(TAG, "onWindowFocusChanged----------------------->")
        var result = false
        handler.postDelayed(Runnable {
            result = condition(currentType)
            Log.i(TAG, "CheckCondition result is:$result")
            if (result) {
                nextCreateWifAp.isEnabled = true
            } else {
                nextCreateWifAp.isEnabled = false
            }
        }, 1000)
    }