download file2

MainActivity.java

package ir.kivee.androiddownloadingfile;

import android.app.Dialog;
import android.app.ProgressDialog;
import android.graphics.drawable.Drawable;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;

import java.io.BufferedInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;
import java.net.URLConnection;

public class MainActivity extends AppCompatActivity {

    Button button;
    private ProgressDialog progressDialog;
    ImageView imageView;
    public static final int progressType = 0;

    // آدرس عکس
    private static String url = "http://cdn.persiangig.com/preview/70hPcBEnKG/DownloadImageorFile.jpg";

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        button = (Button) findViewById(R.id.download_button);
        imageView = (ImageView) findViewById(R.id.imageView);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // اسنک تسک صدا زده میشه
                new DownloadFromURL().execute(url);
            }
        });
    }

    class DownloadFromURL extends AsyncTask<String, String, String> {
        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            showDialog(progressType);
        }

        @Override
        protected String doInBackground(String... fileUrl) {
            int count;
            try {
                URL url = new URL(fileUrl[0]);
                URLConnection urlConnection = url.openConnection();
                urlConnection.connect();
                // نمایش پروگرس بار
                int fileLength = urlConnection.getContentLength();
                InputStream inputStream = new BufferedInputStream(url.openStream(), 8192);
                OutputStream outputStream = new FileOutputStream("/sdcard/downloadedfile.jpg");

                byte data[] = new byte[1024];
                long total = 0;
                while ((count = inputStream.read(data)) != -1) {
                    total += count;
                    publishProgress("" + (int) ((total * 100) / fileLength));
                    outputStream.write(data, 0, count);
                }
               
                outputStream.flush();
                outputStream.close();
                inputStream.close();

            } catch (Exception e) {
                Log.e("Error: ", e.getMessage());
            }
            return null;
        }

        // آپدیت کردن پروگرس دیالوگ

        protected void onProgressUpdate(String... progress) {
            // نمایش درصد دانلود
            progressDialog.setProgress(Integer.parseInt(progress[0]));
        }

        @Override
        protected void onPostExecute(String file_url) {
            dismissDialog(progressType);
            String imagePath = Environment.getExternalStorageDirectory().toString() + "/downloadedfile.jpg";
            imageView.setImageDrawable(Drawable.createFromPath(imagePath));
        }
    }

    //progress dialog
    @Override
    protected Dialog onCreateDialog(int id) {
        switch (id) {
            case progressType: // در هنگام شروع باید ۰ باشد
                progressDialog = new ProgressDialog(this);
                progressDialog.setMessage("File is Downloading. Please wait...");
                progressDialog.setIndeterminate(false);
                progressDialog.setMax(100);
                progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
                progressDialog.setCancelable(true);
                progressDialog.show();
                return progressDialog;
            default:
                return null;
        }
    }
}