Cómo recuperar cadenas base64 (imagen grande) del servidor a Android
Tengo que recuperar imágenes de todos los tamaños desde el servidor a Android móvil con referencia a ID, de modo que probé esto con la siguiente codificación y obtuve con éxito la cadena base 64 y la imagen recuperada para una base64string equivalente. Para imágenes de gran tamaño, permanece en pantalla negra, pero no puede obtener imágenes de gran tamaño en pantalla a través de este método.
gracias por adelantado.
como recuperarcadena base64 de gran tamaño a través de un objeto de jabón desde un servidorpackage com.imageload;
import java.io.IOException;
import java.util.StringTokenizer;
import org.ksoap2.SoapEnvelope;
import org.ksoap2.serialization.SoapObject;
import org.ksoap2.serialization.SoapPrimitive;
import org.ksoap2.serialization.SoapSerializationEnvelope;
import org.ksoap2.transport.HttpTransportSE;
import org.xmlpull.v1.XmlPullParserException;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Typeface;
import android.os.Bundle;
import android.util.Base64;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
public class ImageloadActivity extends Activity {
/** Called when the activity is first created. */
private Button submit,clr,ext;
private ImageView imageView;
private TextView institute,orderno,name,mobno,handeled,regdat,delvdat,pname,pamt,dirby,regby,delby;
String val11,val12,val13,val14;
String str = null,str2 = null;
String error="0",IiD;
/* private static final String SOAP_ACTION = "http://tempuri.org/sta1";
private static final String METHOD_NAME = "sta1";
private static final String NAMESPACE = "http://tempuri.org/";
private static final String URL = "http://cyberstudents.in/newand//service.asmx";*/
private static final String SOAP_ACTION = "http://tempuri.org/IMAGE";
private static final String METHOD_NAME = "IMAGE";
private static final String NAMESPACE = "http://tempuri.org/";
//private static final String URL = "http://cyberstudents.in/crdroid//service.asmx";
private static final String URL = "http:///localdb/Service.asmx";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
this.orderno=(TextView)this.findViewById(R.id.ordernoeditText);
this.pname=(TextView)this.findViewById(R.id.insTextView);
this.submit=(Button)this.findViewById(R.id.getbutton);
this.clr=(Button)this.findViewById(R.id.clearbutton);
this.ext=(Button)this.findViewById(R.id.Exitbutton);
this.imageView =(ImageView) findViewById(R.id.imageView1);
orderno.setText("CB2-1112-CEA0883");
this.submit.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
IiD=orderno.getText().toString();
if(error.equals("0"))
{
SoapObject request = new SoapObject(NAMESPACE,METHOD_NAME);
SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
envelope.dotNet=true;
request.addProperty("ID",IiD);
envelope.setOutputSoapObject(request);
HttpTransportSE androidHttpTransport = new HttpTransportSE(URL);
try
{
try
{
androidHttpTransport.call(SOAP_ACTION, envelope);
}
catch (XmlPullParserException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
SoapPrimitive result = (SoapPrimitive)envelope.getResponse();
//to get the data should be a base
String resultData = result.toString();
//pname.setText(resultData);
byte[] decodedString = Base64.decode(resultData, Base64.DEFAULT);
Bitmap decodedByte = BitmapFactory.decodeByteArray(decodedString, 0, decodedString.length);
imageView.setImageBitmap(decodedByte);
}
catch (IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
});
this.clr.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
pname.setText("");
}
});
this.ext.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
System.exit(0);
}
});
}
}
[WebMethod]
public string IMAGE(string ID)
{
SqlConnection conn = new SqlConnection("Data Source=;Initial Catalog=;Persist Security Info=True;User ID=sa;");
conn.Open();
SqlDataAdapter sdImageSource = new SqlDataAdapter();
sdImageSource.SelectCommand = new SqlCommand("select ImageData from ImagesStore where ImageId=('" + ID + "')", conn);
DataSet dsImage = new DataSet();
sdImageSource.Fill(dsImage);
byte[] blob = (byte[])dsImage.Tables[0].Rows[0][0];
int k = blob.Length;
string c = Convert.ToBase64String(blob);
return c;
}