[英]How to download and automatic install apk from url in android
I'm trying to programmatically download an .apk
file from a given URL and then install it, but I am getting a FileNotFoundException
. 我正在尝试以编程方式从给定的URL下载.apk
文件,然后安装它,但是却收到FileNotFoundException
。 What could be a possible reason for the issue? 这个问题可能是什么原因?
try {
URL url = new URL(fileURL);
HttpURLConnection c = (HttpURLConnection) url.openConnection();
c.setRequestMethod("GET");
c.setDoOutput(true);
c.connect();
String PATH = "/mnt/sdcard/Download/";
File file = new File(PATH);
file.mkdirs();
File outputFile = new File(file, "VersionUpdate.apk");
if(outputFile.exists()){
outputFile.delete();
}
FileOutputStream fos = new FileOutputStream(outputFile);
**//Getting error in this line**
InputStream is = c.getInputStream();
byte[] buffer = new byte[1024];
int len1 = 0;
while ((len1 = is.read(buffer)) != -1) {
fos.write(buffer, 0, len1);
}
fos.flush();
fos.close();
is.close();
} catch (Exception e) {
Log.e("UpdateAPP", "Update error! " + e.getMessage());
}
return null;
}
@Override
protected void onPostExecute(String unused) {
//dismiss the dialog after the file was downloaded
dismissDialog(DIALOG_DOWNLOAD_PROGRESS);
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setDataAndType(Uri.parse("file:///sdcard/download/VersionUpdate.apk"),"application/vnd.android.package-archive");
startActivity(intent);
}
You just replaced by InputStream is = c.getInputStream(); 您刚刚被InputStream替换的是= c.getInputStream(); to given code. 给定的代码。
InputStream is ;
int status = c.getResponseCode();
if (status != HttpURLConnection.HTTP_OK)
is = c.getErrorStream();
else
is = c.getInputStream();
Try the following code 试试下面的代码
File outputFile = new File(file, "VersionUpdate.apk");
if(!outputFile.exists())
{
outputFile.createNewFile();
}
What you are doing is deleting the file, when it already exist, then FileOutputStream
will not get file where you want to download the apk
. 您正在做的是删除文件,如果文件已经存在,则FileOutputStream
将不会在您要下载apk
位置获取文件。
If the file already exist, FileOutputStream
will override the content with new update. 如果文件已经存在,则FileOutputStream
将使用新的更新覆盖内容。
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