Friday, March 23, 2012

How to Download an image in ANDROID programatically?


How to Download an image in ANDROID programatically?

Hello everyone..
In one of my tutorials I have shown you how to upload an image in android..
In todays tutorial I will show you how to download an image into your phone programatically.
I am just picking up an image url from google to show the download.
This is the main program that downloads the file.
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Drag and copy the code
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package pack.coderzheaven;
 
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
import org.apache.http.util.ByteArrayBuffer;
import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
 
public class DownloadImage extends Activity {
 
    private final String PATH = "/data/data/pack.coderzheaven/";
    TextView tv;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        tv = (TextView)findViewById(R.id.tv);
        DownloadFromUrl(PATH+"dwn_img.jpg");
    }
    public void DownloadFromUrl(String fileName) {
            try {
                    URL url = new URL("http://t3.gstatic.com/images?q=tbn:ANd9GcQs0EPegqi56Alq4vCgC_lVDbZvJtk51RhER7AyDEVA3nUkzjMVK-yDHY3V-w"); //you can write here any link
                    File file = new File(fileName);
 
                    long startTime = System.currentTimeMillis();
                    tv.setText("Starting download......from " + url);
                    URLConnection ucon = url.openConnection();
                    InputStream is = ucon.getInputStream();
                    BufferedInputStream bis = new BufferedInputStream(is);
                    /*
                     * Read bytes to the Buffer until there is nothing more to read(-1).
                     */
                    ByteArrayBuffer baf = new ByteArrayBuffer(50);
                    int current = 0;
                    while ((current = bis.read()) != -1) {
                            baf.append((byte) current);
                    }
 
                    FileOutputStream fos = new FileOutputStream(file);
                    fos.write(baf.toByteArray());
                    fos.close();
                    tv.setText("Download Completed in" + ((System.currentTimeMillis() - startTime) / 1000) + " sec");
            } catch (IOException e) {
                 tv.setText("Error: " + e);
            }
    }
}
AndroidManifest.xml
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<?xml version="1.0" encoding="utf-8"?>
      package="pack.coderzheaven"
      android:versionCode="1"
      android:versionName="1.0">
 
        <uses-permission android:name="android.permission.INTERNET"></uses-permission>
        <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission>
        <uses-permission android:name="android.permission.READ_PHONE_STATE"></uses-permission>
 
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".DownloadImage"
                  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>
main.xml contents.
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<?xml version="1.0" encoding="utf-8"?>
      package="pack.coderzheaven"
      android:versionCode="1"
      android:versionName="1.0">
 
        <uses-permission android:name="android.permission.INTERNET"></uses-permission>
        <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission>
        <uses-permission android:name="android.permission.READ_PHONE_STATE"></uses-permission>
 
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".DownloadImage"
                  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>
Strings.xml
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<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="hello">DownloadImage Demo from CoderzHeaven</string>
    <string name="app_name">DownloadImage</string>
</resources>
Download Image Demo
Download Image Demo
Download Image Demo

1 comment:

Ivan said...

Hi Umamahesh,
congrats for the tutorial!!
I copied it and when execute appears the next message
Error: java.io.FileNotFoundException:/data/data/com.telecoming.griv/dwn_img.jpg (No such file or directory)
Any clue about the issue??
Thank you very much