CODEWITHSUNDEEP
androidamazon-s3download
Mansi
Mansi

Reputation: 1949

Android : Exception coming when download file from AmazonS3

In my Android App when I am try to download image file from Amazon S3 it gives me exception

Here It is exception:

08-30 11:20:34.157: W/System.err(6519): android.os.NetworkOnMainThreadException
08-30 11:20:34.157: W/System.err(6519): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1099)
08-30 11:20:34.157: W/System.err(6519):     at java.net.InetAddress.lookupHostByName(InetAddress.java:391)
08-30 11:20:34.157: W/System.err(6519):     at java.net.InetAddress.getAllByNameImpl(InetAddress.java:242)
08-30 11:20:34.157: W/System.err(6519):     at java.net.InetAddress.getAllByName(InetAddress.java:220)
08-30 11:20:34.157: W/System.err(6519):     at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137)
08-30 11:20:34.168: W/System.err(6519):     at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
08-30 11:20:34.168: W/System.err(6519):     at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
08-30 11:20:34.168: W/System.err(6519):     at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
08-30 11:20:34.177: W/System.err(6519):     at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
08-30 11:20:34.177: W/System.err(6519):     at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
08-30 11:20:34.177: W/System.err(6519):     at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
08-30 11:20:34.177: W/System.err(6519):     at com.amazonaws.http.AmazonHttpClient.executeHelper(AmazonHttpClient.java:285)
08-30 11:20:34.177: W/System.err(6519):     at com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:167)
08-30 11:20:34.187: W/System.err(6519):     at com.amazonaws.services.s3.AmazonS3Client.invoke(AmazonS3Client.java:2781)
08-30 11:20:34.187: W/System.err(6519):     at com.amazonaws.services.s3.AmazonS3Client.getObject(AmazonS3Client.java:872)
08-30 11:20:34.187: W/System.err(6519):     at com.example.amazons3.AmazonS3DemoActivity.Download(AmazonS3DemoActivity.java:74)
08-30 11:20:34.187: W/System.err(6519):     at java.lang.reflect.Method.invokeNative(Native Method)
08-30 11:20:34.187: W/System.err(6519):     at java.lang.reflect.Method.invoke(Method.java:511)
08-30 11:20:34.187: W/System.err(6519):     at android.view.View$1.onClick(View.java:3039)
08-30 11:20:34.197: W/System.err(6519):     at android.view.View.performClick(View.java:3511)
08-30 11:20:34.197: W/System.err(6519):     at android.view.View$PerformClick.run(View.java:14105)
08-30 11:20:34.197: W/System.err(6519):     at android.os.Handler.handleCallback(Handler.java:605)
08-30 11:20:34.197: W/System.err(6519):     at android.os.Handler.dispatchMessage(Handler.java:92)
08-30 11:20:34.207: W/System.err(6519):     at android.os.Looper.loop(Looper.java:137)
08-30 11:20:34.207: W/System.err(6519):     at android.app.ActivityThread.main(ActivityThread.java:4424)
08-30 11:20:34.207: W/System.err(6519):     at java.lang.reflect.Method.invokeNative(Native Method)
08-30 11:20:34.207: W/System.err(6519):     at java.lang.reflect.Method.invoke(Method.java:511)
08-30 11:20:34.217: W/System.err(6519):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
08-30 11:20:34.227: W/System.err(6519):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
08-30 11:20:34.227: W/System.err(6519):     at dalvik.system.NativeStart.main(Native Method)

Here it my java Code:

public class AmazonS3Activity extends Activity 
{
private String Tag = "Downlaod";

Button btnDownload;

Context myContext;

String product_code = "pro_code";

String bucketName = "bucketnamw";

String appDirPath = Environment.getExternalStorageDirectory().getName() +"/foldername/";

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    myContext = this;

    btnDownload = (Button) findViewById(R.id.btnDownload);      
}

public void Download(View button)
{
    try 
    {
        String imgName = product_code+"1.jpg";
        String md5Name = getMD5HasCode(product_code);

        String productCode = md5Name+".app/";

        String filePath = getFullFilePath(imgName);

        String accessKey = "accessKey";
        String secretKey = "secretKey";
        AWSCredentials credential = new BasicAWSCredentials(accessKey, secretKey);

        Log.e(Tag, "FileName : " + filePath, null);

        String strObjectKey = productCode + imgName.replace(product_code,md5Name);

        Log.e(Tag, "Object Key : " + strObjectKey, null);

        GetObjectRequest objRequest = new GetObjectRequest(bucketName,strObjectKey);

        AmazonS3Client myS3Client = new AmazonS3Client(credential);

        S3Object s3Object = myS3Client.getObject(objRequest);

        long fileSize = s3Object.getObjectMetadata().getContentLength();
        final InputStream input = s3Object.getObjectContent();
        final FileOutputStream fos = new FileOutputStream(filePath);

        long total = 0;
        int len=0;

        byte[] buf = new byte[1024];

        while((len = input.read(buf)) > 0)
        {
            fos.write(buf,0,len);

            total = total + len;
        }

        if(len == -1 && total==fileSize)
        {
            Thread.currentThread().interrupt();

            input.close();
            fos.close();

        }

    } 
    catch (Exception e) 
    {
        e.printStackTrace();
        Log.e(Tag, "Error Key : " + e.getMessage(), null);
    }

}

public String getMD5HasCode(String strMessage)
{
    try
    {
        MessageDigest messageDigest = MessageDigest.getInstance("MD5");
        byte[] messageDigestBytes = messageDigest.digest(strMessage.getBytes());
        BigInteger hasNumber = new BigInteger(1,messageDigestBytes);
        String md5 = hasNumber.toString(16);

        while(md5.length()<32)
        {
            md5 = "0" + md5;
        }

        return md5;
    }
    catch (Exception ex) 
    {
        Toast.makeText(myContext, "ERROR in HasCode : "+ex.toString(), Toast.LENGTH_SHORT).show();  
        return null;
    }
}

public String getFullFilePath(String filename)
{
    File dir = new File(appDirPath);
    if(!dir.exists())
    {
        dir.mkdir();
    }
    return appDirPath+filename;
}
 }

Upvotes: 3

Views: 2428

Answers (1)

Vinay
Vinay

Reputation: 6879

As of the documentation found here.

NetworkOnMainThreadException is thrown when an application attempts to perform a networking operation on its main thread.

This is only thrown for applications targeting the Honeycomb SDK or higher. Applications targeting earlier SDK versions are allowed to do networking on their main event loop threads, but it's heavily discouraged.

The solution can be using a AsyncTask for Network related operations.

Upvotes: 3

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