Android 本地更新APK(无需添加运行时权限)

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

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,"")