从url下载文件时出现此错误(解析错误:解析包时出现问题。)
我用谷歌搜索,他们说安装Android应用程序时出现问题这个消息出现,但我的问题是不同的Android应用程序运行正常,但当我从URL添加代码下载文件并单击下载按钮时出现此错误消息
此消息在某些设备上显示的奇怪之处并非全部!!
这是我从url下载apk文件的代码:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button btn = (Button)findViewById(R.id.button);
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
new DownloadFileFromURL().execute(LATEST_VERSION_URL);
}
});
}
和DownloadFileFromURL类:
/**
* Background Async Task to download file
* */
class DownloadFileFromURL extends AsyncTask<String, String, String> {
/**
* Before starting background thread
* Show Progress Bar Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
progress = ProgressDialog.show(MainActivity.this, "", "Updating, please wait this may take a few minutes...", true);
}
/**
* Downloading file in background thread
* */
@Override
protected String doInBackground(String... f_url) {
int count;
try {
URL url = new URL(f_url[0]);
URLConnection conection = url.openConnection();
conection.connect();
// getting file length
int lenghtOfFile = conection.getContentLength();
// input stream to read file - with 8k buffer
InputStream input = new BufferedInputStream(url.openStream(), 8192);
// Output stream to write file
OutputStream output = new FileOutputStream("/sdcard/myapp.apk");
byte data[] = new byte[1024];
long total = 0;
while ((count = input.read(data)) != -1) {
total += count;
output.write(data, 0, count);
}
// flushing output
output.flush();
// closing streams
output.close();
input.close();
} catch (Exception e) {
Log.e("Error: ", e.getMessage());
}
return null;
}
/**
* Updating progress bar
* */
protected void onProgressUpdate(String... progress) {
}
/**
* After completing background task
* Dismiss the progress dialog
* **/
@Override
protected void onPostExecute(String file_url) {
progress.dismiss();
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(new File(Environment.getExternalStorageDirectory(), "myapp.apk")), "application/vnd.android.package-archive");
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); // without this flag android returned a intent error!
startActivity(intent);
}
任何人都可以帮助我,我已经解决了这个问题超过2天
感谢。
更新我解决了它:)
首先问题出现在Android 6(Marshmallow)中,即使用户在安装时接受了您的所有权限,他们以后也可以决定从您那里获取一些权限,以便抛出
java.io.IOException:open failed:EACCES(Permission denied)
所以在上面的代码中,异常抛出并捕获它然后转到 onPostExecute 并尝试打开apk文件并安装它,但实际上文件没有下载因为这个异常。< / p>