Download image from url into sdcard in android

In this article we are going to discuss about how to download image from url and save that image into sdcard by using following concepts

* URLConnection
* DataInputStream
* DataOutputStream
* FileOutputStream

Coming to coding

Create a sample Project

1) Layout File

create a file in res/layout folder

activity_main.xml


<RelativeLayout 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">

    <Button
        android:id="@+id/downloadbtn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:textSize="27sp"
        android:padding="3dp"
        android:text="Download Image" />

</RelativeLayout>

2) AndroidManifest.xml 

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.example.downloadimage"

    android:versionCode="1"

    android:versionName="1.0" >

    <uses-sdk

        android:minSdkVersion="8"

        android:targetSdkVersion="21" />

<uses-permission android:name="android.permission.INTERNET"/>

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

   <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

     <uses-permission android:name="android.permission.CHANGE_NETWORK_STATE"/>

    <application

        android:allowBackup="true"

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name"

        android:theme="@style/AppTheme" >

        <activity

            android:name=".MainActivity"

            android:label="@string/app_name" >

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

    </application>

</manifest>

3) MainActivity.java

import java.io.DataInputStream;

import java.io.DataOutputStream;

import java.io.File;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.net.URL;

import java.net.URLConnection;

import android.app.Activity;

import android.app.ProgressDialog;

import android.os.AsyncTask;

import android.os.Bundle;

import android.os.Environment;

import android.util.Log;

import android.view.View;

import android.widget.Button;

import android.widget.Toast;

public class MainActivity extends Activity {

private ProgressDialog pDialog;

Boolean isInternetPresent = false;

ConnectionDetector cd;

Button downloadbtn;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

downloadbtn=(Button)findViewById(R.id.downloadbtn);

pDialog = new ProgressDialog(this);

cd = new ConnectionDetector(getApplicationContext());

downloadbtn.setOnClickListener(new View.OnClickListener() {

public void onClick(View v) {

// TODO Auto-generated method stub

isInternetPresent = cd.isConnectingToInternet();

if (isInternetPresent) {

download();

}else

{

Toast.makeText(getApplicationContext(), "Please connect to internet", 4000).show();

}

}

});

}

protected void download() {

new DownloadImageFromURL().execute();

}

class DownloadImageFromURL  extends AsyncTask<String, String, String> {

       /**

        * Before starting background thread

        * Show Progress Bar Dialog

        */

       @Override

       protected void onPreExecute() {

           super.onPreExecute();

           pDialog.setMessage("Downloading...");

           pDialog.setCancelable(false);

           pDialog.show();

       }

       /**

        * Downloading file in background thread

        */

       @Override

       protected String doInBackground(String... f_url) {

          String imagepath="provide your image url";

               try {

                 final File filename1 = new File(imagepath);

                  String  imagename = filename1.getName();

                   URL u = new URL(imagepath);

                 

                   URLConnection conn = u.openConnection();

                 

                   int contentLength = conn.getContentLength();

                   DataInputStream stream = new DataInputStream(u.openStream());

                

                   byte[] buffer = new byte[contentLength];

                   stream.readFully(buffer);

                   stream.close();

                   String dir = Environment.getExternalStorageDirectory() + File.separator + "Download";

                   //create folder

                   File folder = new File(dir); //folder name

                   folder.mkdirs();

                  

                 File  folderpath = new File(folder + File.separator + imagename);

                   DataOutputStream fos = new DataOutputStream(new FileOutputStream(folderpath));

                   fos.write(buffer);

                   fos.flush();

                   fos.close();

                } catch (FileNotFoundException e) {

                 

               } catch (IOException e) {

                  

               }

           return "sucess";

 }

       @Override

       protected void onPostExecute(String resp) {

           super.onPostExecute(resp);

          pDialog.dismiss();

       }

}

}

Finally run your application

OUTPUT:

we will find downloaded image in Download folder

we can  display image from sdcard into ImageView Just refer this here