[图片上传中...(32411620824778_.pic.jpg-5ff572-1620826945526-0)]
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确保设备是否有外部存储
fun judgeCard() {
if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
}
}
android6.0以上需要动态申请权限
fun requestPermission() {
val permission = ContextCompat.checkSelfPermission(
this,
Manifest.permission.WRITE_EXTERNAL_STORAGE
)
if (permission != PackageManager.PERMISSION_GRANTED) {
//动态申请权限
ActivityCompat.requestPermissions(
this,
arrayOf(Manifest.permission.WRITE_EXTERNAL_STORAGE),
1
)
}
}
//当动态申请权限的过程中 requestCode等于几 做什么操作
override fun onRequestPermissionsResult(
requestCode: Int,
permissions: Array<out String>,
grantResults: IntArray
) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults)
if (requestCode == 1) {
}
}
Environment.getExternalStorageDirectory() 获取的目录才是sdcard的实际目录(系统不同会造成路径有差异)
继承Thread和实现Runnable接口的区别
image.png
Application对象和静态单列的区别
WeChatf6bc506c6276bb2b26d20b34b41cc1d4.png
WeChat771200f9af0968e095a182428fb5f808.png
