Android开发okhttp下载图片带进度
下载网络图片的方法有很多,这次介绍写用okhttp来下载网络图片,主要我看中的是用okhttp下载有进度返回,提示下用户
一、思路:
用OkHttpClient().newCall(request)
二、效果图:
三、关键代码:
kotlin
// 联系:893151960
fun download(mContext: Context,url: String,fileName:String,fileType:String, listener:(Int, Int,String) -> Unit) {
// 需要token的时候可以这样做
// Request request = new Request.Builder().header("token",token).url(url).build();
val request: Request = Request.Builder().url(url).build()
OkHttpClient().newCall(request).enqueue(object : Callback {
override fun onFailure(call: Call, e: IOException) {
e.printStackTrace()
listener(0,2,"")
}
override fun onResponse(call: Call, response: Response) {
listener(0,3,"")
var inputStream: InputStream? = null
val buf = ByteArray(2048)
var len: Int = -1
var fos: FileOutputStream? = null
try {
inputStream = response.body?.byteStream()
val total: Long = response.body?.contentLength()!!
val file = File(getSandboxPath(mContext,fileType), fileName)
fos = FileOutputStream(file)
var sum: Long = 0
while ((inputStream?.read(buf) ?: -1).also { len = it } != -1) {
fos.write(buf, 0, len)
sum += len.toLong()
(sum * 1.0f / total * 100).toInt().let {
if(it > progress){
progress = it
listener(it,0,"")
}
}
}
fos.flush()
listener(0,1,file.path)
} catch (e: Exception) {
listener(0,2,"")
} finally {
try {
inputStream?.close()
fos?.close()
} catch (e: IOException) {
e.printStackTrace()
}
}
}
})
}
四、完整项目demo结构图:
有问题或者需要完整源码的私信我