很多APP都会有自动更新APP然后本地安装的功能 之前一直是用AsnycTask来做的 最近发现AsyncTask被标记为过时 那么就换一种方式来写吧
我自己是做在Dialog里面 使用okhttp进行文件下载 配合自定义View的进度条进行展示的
首先老规矩上图
开始下载了
下载完成后自动进入安装页面
话不多说 我们先来定义一个用来回调的接口 分别对应成功 失败 和进度
interface DownloadListener {
fun onSuccess()
fun onFailed(msg: String)
fun onProgress(progress: Int)
}
首先就是我们对于文件的处理
//首先是我们的下载地址 没什么好说的就使用app本地的file文件夹就可以了
val path = getExternalFilesDir(null)!!.absolutePath+"/app.apk"
//先生成我们的文件
val file = File(path)
//这里看你需求 是否需要短线点续传 需要的话就记录一下当前下载长度
var currentLength = 0L
if (file.exists()){
// currentLength=file.length()//下载长度 如果你需要断点续传就使用这个参数并去掉删除文件的方法
file.delete()
}
接着创建一个okhttp实例并获取我们目标文件的总长度(大小)用来处理我们下载的百分比
private val client = OkHttpClient()
val request = Request.Builder().url(url).build()
val response = client.newCall(request).execute()
return if (response.isSuccessful) {
//获取文件长度
val length = response.body?.contentLength() as Long
response.body!!.close()
length
} else {
//如果回调失败了就返回长度为0
0
}
根据长度来判断文件是否下载完了
val fileLength = fileLength(url)//获取文件总长度
if (fileLength == 0L) {//如果获取的文件长度为0则失败
listener.onFailed("文件长度为0")
} else if (currentLength == fileLength) {//如果获取的文件长度和下载的文件长度相等则下载完毕
listener.onSuccess()
}
接着就要开始下载文件咯
//使用OkHttp进行APK下载
//请求头为RANGE 如果是断点续传就是bytes=[start,end]
val request = Request.Builder().addHeader("RANGE", "bytes=$currentLength-").url(url).build()
val response = client.newCall(request).execute()
val inputStream = response.body?.byteStream()
val saverFile = RandomAccessFile(file, "rw")
saverFile.seek(currentLength)
val b = ByteArray(1024)
var total = 0
var len = inputStream!!.read(b)
while (len != -1) {
total += len
saverFile.write(b, 0, len)
val progress = ((total + currentLength) * 100 / fileLength).toInt()
//下载的百分比回调
listener.onProgress(progress)
len = inputStream.read(b)
}
response.body?.close()
inputStream.close()
saverFile.close()
//下载完毕
listener.onSuccess()
文件下载完毕就可以进行apk的安装了
val file=File(path)
val intent = Intent(Intent.ACTION_VIEW)
intent.setDataAndType(Uri.parse("file://$file"), "application/vnd.android.package-archive")
intent.flags = Intent.FLAG_ACTIVITY_NEW_TASK
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
//这边使用你自己定义的FileProvider 此处就不进行讲解了
val contentUri = FileProvider.getUriForFile(this, "com.xxxx.provider", file)
intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
intent.setDataAndType(contentUri, "application/vnd.android.package-archive")
} else {
intent.setDataAndType(Uri.parse("file://$file"), "application/vnd.android.package-archive")
}
startActivity(intent)
//杀掉APP
android.os.Process.killProcess(android.os.Process.myPid())
另外需要使用的权限有 都不是运行时权限
//安装本地APK的权限
<uses-permission android:name="android.permission.REQUEST_INSTALL_PACKAGES"/>
//访问网络的权限
<uses-permission android:name="android.permission.INTERNET" />
好了完结散花 最后送上我封装好的代码
首先是接口
interface DownloadListener {
fun onSuccess()
fun onFailed(msg: String)
fun onProgress(progress: Int)
}
//然后是下载的工具类
object DownloadUtil{
private val client = OkHttpClient()
fun download(url:String,path:String,listener:DownloadListener){
thread {
val file = File(path)
var currentLength = 0L
if (file.exists()){
// currentLength=file.length()//下载长度 如果你需要断点续传就使用这个参数并去掉删除的方法
file.delete()
}
val fileLength = fileLength(url)//获取文件总长度
if (fileLength == 0L) {//如果获取的文件长度为0则失败
listener.onFailed("文件长度为0")
} else if (currentLength == fileLength) {//如果获取的文件长度和下载的文件长度相等则下载完毕
listener.onSuccess()
}
//使用OkHttp进行APK下载
//请求头为RANGE 如果是断点续传就是bytes=[start,end]
val request = Request.Builder().addHeader("RANGE", "bytes=$currentLength-").url(url).build()
val response = client.newCall(request).execute()
val inputStream = response.body?.byteStream()
val saverFile = RandomAccessFile(file, "rw")
saverFile.seek(currentLength)
val b = ByteArray(1024)
var total = 0
var len = inputStream!!.read(b)
while (len != -1) {
total += len
saverFile.write(b, 0, len)
val progress = ((total + currentLength) * 100 / fileLength).toInt()
//下载的百分比回调
listener.onProgress(progress)
len = inputStream.read(b)
}
response.body?.close()
inputStream.close()
saverFile.close()
//下载完毕
listener.onSuccess()
}
}
//获取文件长度
private fun fileLength(url: String): Long {
val request = Request.Builder().url(url).build()
val response = client.newCall(request).execute()
return if (response.isSuccessful) {
val length = response.body?.contentLength() as Long
response.body!!.close()
length
} else {
0
}
}
}
接着是用来展示下载页面的Dialog
class UpdateDialog( private val downloadUrl: String, private val path: String, private val because: String) : DialogFragment() {
//进度展示
private var mProgressTV: TextView? = null
private var mBecauseTV: TextView? = null
private var mUpdateViw: UpdateProgressView? = null
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
val view=inflater.inflate(R.layout.layout_update_dialog,container,false)
mProgressTV = view.findViewById(R.id.mProgressTV)
mBecauseTV = view.findViewById(R.id.mBecauseTV)
mUpdateViw = view.findViewById(R.id.mUpdateViw)
mBecauseTV?.text = because.handlerNull()
DownloadUtil.download(downloadUrl, path, object : DownloadListener {
override fun onSuccess() {
updateApp(path)
}
override fun onFailed(msg: String) {
myLog("下载失败了")
}
override fun onProgress(progress: Int) {
myLog("下载百分比:$progress %")
mUpdateViw?.handlerPercent(progress)
requireActivity().runOnUiThread {
val p="正在升级中${progress}%"
mProgressTV?.text = p
}
}
})
return view
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setStyle(STYLE_NORMAL, R.style.CommonDialog)
}
private fun updateApp(path: String) {
MyLog.d("安装APP")
val file = File(path)
val intent = Intent(Intent.ACTION_VIEW)
intent.setDataAndType(Uri.parse("file://$file"), "application/vnd.android.package-archive")
intent.flags = Intent.FLAG_ACTIVITY_NEW_TASK
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
val contentUri = FileProvider.getUriForFile(requireContext(), "com.xxxx.provider", file)
intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
intent.setDataAndType(contentUri, "application/vnd.android.package-archive")
} else {
intent.setDataAndType(Uri.parse("file://$file"), "application/vnd.android.package-archive")
}
requireActivity().startActivity(intent)
//杀掉APP
android.os.Process.killProcess(android.os.Process.myPid())
}
}
dialog的页面 这里使用的展示进度条的自定义View可以看我另外一篇文章
https://www.jianshu.com/p/001fc038b557
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="horizontal">
<LinearLayout
android:gravity="center_horizontal"
android:layout_width="260dp"
android:layout_height="300dp"
android:background="@drawable/bg_solid_whit_radius5dp"
android:orientation="vertical"
tools:ignore="UselessParent">
<TextView
android:id="@+id/mBecauseTV"
android:textSize="12sp"
android:layout_marginTop="20dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<com.android.bowenporjectv2.weiget.UpdateProgressView
android:id="@+id/mUpdateViw"
android:layout_width="150dp"
android:layout_height="150dp"/>
<TextView
android:layout_marginHorizontal="20dp"
android:id="@+id/mProgressTV"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:layout_marginTop="20dp"
android:text="正在升级中...%"
android:textSize="12sp" />
</LinearLayout>
</LinearLayout>
dialog的样式
<style name="CommonDialog">
<item name="android:windowCloseOnTouchOutside">true</item>
<item name="android:windowFrame">@null</item>
<item name="android:windowIsFloating">true</item>
<item name="android:windowIsTranslucent">true</item>
<item name="android:windowNoTitle">true</item>
<item name="android:background">@android:color/transparent</item>
<item name="android:windowBackground">@android:color/transparent</item>
</style>
最后就是使用了
//下载地址
val url = "你自己app的下载地址"
//对应手机android/data/你的包名下/files/
val path = getExternalFilesDir(null)!!.absolutePath+"/app.apk"
UpdateDialog(url,path,"优化app").show(supportFragmentManager,"")
