f7a13682
 “wangming”
项目初始化
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package etelligens.com.foodsafety.utils;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.os.AsyncTask;
import android.os.Environment;
import android.os.Handler;
import android.util.Log;
import android.widget.Toast;
import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.view.ContextThemeWrapper;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import etelligens.com.foodsafety.R;
public class FileDownloader {
private static final String TAG = "Download Task";
private Context context;
private String downloadUrl = "", downloadFileName = "";
private ProgressDialog progressDialog;
public FileDownloader(Context context, String downloadUrl) {
this.context = context;
this.downloadUrl = downloadUrl;
downloadFileName = downloadUrl.substring(downloadUrl.lastIndexOf('/'), downloadUrl.length());//Create file name by picking download file name from URL
Log.e(TAG, downloadFileName);
//Start Downloading Task
new DownloadingTask().execute();
}
private class DownloadingTask extends AsyncTask<Void, Void, Void> {
File apkStorage = null;
File outputFile = null;
@Override
protected void onPreExecute() {
super.onPreExecute();
progressDialog = new ProgressDialog(context);
progressDialog.setMessage("Downloading...");
progressDialog.setCancelable(false);
progressDialog.show();
}
@Override
protected void onPostExecute(Void result) {
try {
if (outputFile != null) {
progressDialog.dismiss();
ContextThemeWrapper ctw = new ContextThemeWrapper(context, R.style.AppTheme);
final AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(ctw);
alertDialogBuilder.setTitle("Document ");
alertDialogBuilder.setMessage("Document Downloaded Successfully ");
alertDialogBuilder.setCancelable(false);
alertDialogBuilder.setPositiveButton("ok", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
}
});
/* alertDialogBuilder.setNegativeButton("Open report", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
File pdfFile = new File(Environment.getExternalStorageDirectory() + "/CodePlayon" + downloadFileName); // -> filename = maven.pdf
Uri path = Uri.fromFile(pdfFile);
Intent pdfIntent = new Intent(Intent.ACTION_VIEW);
pdfIntent.setDataAndType(path, "application/pdf");
pdfIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
pdfIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
try {
context.startActivity(pdfIntent);
} catch (ActivityNotFoundException e) {
Toast.makeText(context, "No Application available to view PDF", Toast.LENGTH_SHORT).show();
}
}
});*/
alertDialogBuilder.show();
// Toast.makeText(context, "Document Downloaded Successfully", Toast.LENGTH_SHORT).show();
} else {
progressDialog.dismiss();
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
}
}, 3000);
Log.e(TAG, "Download Failed");
}
} catch (Exception e) {
e.printStackTrace();
progressDialog.dismiss();
//Change button text if exception occurs
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
}
}, 3000);
Log.e(TAG, "Download Failed with Exception - " + e.getLocalizedMessage());
}
super.onPostExecute(result);
}
@Override
protected Void doInBackground(Void... arg0) {
try {
URL url = new URL(downloadUrl);//Create Download URl
HttpURLConnection c = (HttpURLConnection) url.openConnection();//Open Url Connection
c.setRequestMethod("GET");//Set Request Method to "GET" since we are grtting data
c.connect();//connect the URL Connection
//If Connection response is not OK then show Logs
if (c.getResponseCode() != HttpURLConnection.HTTP_OK) {
Log.e(TAG, "Server returned HTTP " + c.getResponseCode()
+ " " + c.getResponseMessage());
}
//Get File if SD card is present
if (new CheckForSDCard().isSDCardPresent()) {
apkStorage = new File(Environment.getExternalStorageDirectory() + "/" + "Food Safety");
} else
Toast.makeText(context, "Oops!! There is no SD Card.", Toast.LENGTH_SHORT).show();
//If File is not present create directory
if (!apkStorage.exists()) {
apkStorage.mkdir();
Log.e(TAG, "Directory Created.");
}
outputFile = new File(apkStorage, downloadFileName);//Create Output file in Main File
//Create New File if not present
if (!outputFile.exists()) {
outputFile.createNewFile();
Log.e(TAG, "File Created");
}
FileOutputStream fos = new FileOutputStream(outputFile);//Get OutputStream for NewFile Location
InputStream is = c.getInputStream();//Get InputStream for connection
byte[] buffer = new byte[1024];//Set buffer type
int len1 = 0;//init length
while ((len1 = is.read(buffer)) != -1) {
fos.write(buffer, 0, len1);//Write new file
}
//Close all connection after doing task
fos.close();
is.close();
} catch (Exception e) {
//Read exception if something went wrong
e.printStackTrace();
outputFile = null;
Log.e(TAG, "Download Error Exception " + e.getMessage());
}
return null;
}
}
}
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