<?xml version="1.0" encoding="utf-8"?>
<paths>
    <!-- 內(nèi)部存儲，等同于Context.getFilesDir,路徑:/data/data/包名/files目錄-->
    <files-path
        name="DocDir"
        path="/" />
    <!-- 內(nèi)部存儲，等同于Context.getCacheDir,路徑:/data/data/包名/cache目錄-->
    <cache-path
        name="CacheDocDir"
        path="/" />
    <!--外部存儲，等同于Context.getExternalFilesDir,路徑:/storage/sdcard/Android/data/包名/files-->
    <external-files-path
        name="ExtDocDir"
        path="/" />
    <!--外部存儲，等同于Context.getExternalCacheDir 路徑:/storage/sdcard/Android/data/包名/cache-->
    <external-cache-path
        name="ExtCacheDir"
        path="/" />
</paths>

        <provider
            android:name="androidx.core.content.FileProvider"
            android:authorities="com.unclexing.exploreapp.fileprovider"
            android:exported="false"
            android:grantUriPermissions="true">
            <!--exported:要為false，為true則會報(bào)安全異常。grantUriPermissions為true，表示授予URI臨時訪問權(quán)限-->
            <meta-data
                android:name="androidx.core.FILE_PROVIDER_PATHS"
                android:resource="@xml/file_paths" />
        </provider>

            val file = File(
                getExternalFilesDir(null),
                "/temp/" + System.currentTimeMillis() + ".jpg"
            )
            if (!file.parentFile.exists()) {
                file.parentFile.mkdirs()
            }
            //通過FileProvider創(chuàng)建一個content類型的Uri
            val imageUri = FileProvider.getUriForFile(
                this,
                "com.unclexing.exploreapp.fileprovider", file
            )
            val intent = Intent()
            //表示對目標(biāo)應(yīng)用臨時授權(quán)該Uri所代表的文件
            intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
            intent.action = MediaStore.ACTION_IMAGE_CAPTURE
            //將拍攝的照片保存到特定的URI
            intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri)
            startActivity(intent)

    private fun createNotification() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            val notificationManager =
                getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
            //如果要分組，groupId要唯一
            val groupId = "group1"
            val group = NotificationChannelGroup(groupId, "advertisement")
            notificationManager.createNotificationChannelGroup(group)
            //channelId唯一
            val channelId = "channel1"
            val notificationChannel = NotificationChannel(
                channelId,
                "promote information",
                NotificationManager.IMPORTANCE_DEFAULT
            )
            //將渠道添加進(jìn)組，必須先創(chuàng)建組才能添加
            notificationChannel.group = groupId
            notificationManager.createNotificationChannel(notificationChannel)
            //創(chuàng)建通知
            val notification = Notification.Builder(this, channelId)
                .setSmallIcon(R.mipmap.ic_launcher)
                .setLargeIcon(BitmapFactory.decodeResource(resources, R.mipmap.ic_launcher))
                .setContentTitle("A new notice")
                .setContentText("Likes and follows")
                .setAutoCancel(true)
                .build()
            notificationManager.notify(1, notification)
        }
    }

            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                val intent = Intent(this, UncleService::class.java)
                startForegroundService(intent)
            }

class UncleService : Service() {
    override fun onCreate() {
        super.onCreate()
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            val manager = getSystemService(NOTIFICATION_SERVICE) as NotificationManager
            val channel =
                NotificationChannel("channelId", "channelName", NotificationManager.IMPORTANCE_HIGH)
            manager.createNotificationChannel(channel)
            val notification = Notification.Builder(this, "channelId")
                .build()
            startForeground(1, notification)
        }
    }
    override fun onDestroy() {
        super.onDestroy()
        stopForeground(true)
    }
    override fun onBind(p0: Intent?): IBinder? {
        return null
    }
}

<uses-permission android:name="android.permission.FOREGROUND_SERVICE"/>

<?xml version="1.0" encoding="utf-8"?>
<network-security-config>
    <base-config cleartextTrafficPermitted="true" />
</network-security-config>

android:networkSecurityConfig="@xml/network_config"

<?xml version="1.0" encoding="utf-8"?>
<network-security-config>
    <domain-config cleartextTrafficPermitted="true">
        <domain includeSubdomains="true">csdn.example.com</domain>
    </domain-config>
</network-security-config>

  <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
  <uses-permission android:name="android.permission.ACCESS_BACKGROUND_LOCATION" />
  <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

        val cursor = contentResolver.query(
            MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
            null,
            null,
            null,
            null
        )

    private fun openSAF() {
        val intent = Intent(Intent.ACTION_OPEN_DOCUMENT)
        intent.addCategory(Intent.CATEGORY_OPENABLE)
        //指定選擇文本類型的文件
        intent.type = "text/plain"
        startActivityForResult(intent, 1)
    }
    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        super.onActivityResult(requestCode, resultCode, data)
        if (requestCode == 1 && data != null) {
            val uri = data.data
            startRead(uri!!)
        }
    }
    private fun startRead(uri: Uri) {
        try {
            val inputStream = contentResolver.openInputStream(uri)
            val readContent = ByteArray(1024)
            var len: Int
            do {
                len = inputStream!!.read(readContent)
                if (len != -1) {
                    Log.d(tag, "file content:${String(readContent).substring(0, len)}")
                }
            } while (len != -1)
        } catch (e: Exception) {
            Log.d(tag, "Exception:${e.message}")
        }
    }

    private fun writeForUri(uri: Uri) {
        try {
            val outputStream = contentResolver.openOutputStream(uri)
            val content = "my name is Uncle Xing"
            outputStream?.write(content.toByteArray())
            outputStream?.flush()
            outputStream?.close()
        } catch (e: Exception) {
            Log.d(tag, "Exception:${e.message}")
        }
    }