StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

PONull Error Trying to Upload picture from android phone to a php file to my computer
text
Body
copied!<p>I'm getting a null error when I try to upload a picture from my phone to a php file which sends it to my computer. The file is not getting to the computer. The app works when I upload the picture it shows it but when I try to send it to my computer it sends the null error.</p> <p>This line of code gives the error. </p> <pre><code>HttpResponse response = httpclient.execute(httppost); </code></pre> <p>Any ideas? Thanks! My java class is below and my php file follows.</p> <pre><code> package test.example; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream; import java.nio.ByteBuffer; import java.util.ArrayList; import org.apache.http.HttpResponse; import org.apache.http.NameValuePair; import org.apache.http.client.HttpClient; import org.apache.http.client.entity.UrlEncodedFormEntity; import org.apache.http.client.methods.HttpPost; import org.apache.http.impl.client.DefaultHttpClient; import org.apache.http.message.BasicNameValuePair; import android.app.Activity; import android.content.Intent; import android.database.Cursor; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Bitmap.CompressFormat; import android.net.Uri; import android.os.Bundle; import android.provider.MediaStore; import android.view.View; import android.widget.Button; import android.widget.ImageView; import android.widget.Toast; public class ImageGalleryDemoActivity extends Activity { InputStream inputStream; private static int RESULT_LOAD_IMAGE = 1; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main2); Button buttonLoadImage = (Button) findViewById(R.id.buttonLoadPicture); buttonLoadImage.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { Intent i = new Intent( Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI); startActivityForResult(i, RESULT_LOAD_IMAGE); } }); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); if (requestCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK && null != data) { Uri selectedImage = data.getData(); String[] filePathColumn = { MediaStore.Images.Media.DATA }; Cursor cursor = getContentResolver().query(selectedImage, filePathColumn, null, null, null); cursor.moveToFirst(); int columnIndex = cursor.getColumnIndex(filePathColumn[0]); String picturePath = cursor.getString(columnIndex); cursor.close(); ImageView imageView = (ImageView) findViewById(R.id.imgView); // imageView.setImageBitmap(BitmapFactory.decodeFile(picturePath)); Bitmap bitmap; try { bitmap = BitmapFactory.decodeFile(picturePath); imageView.setImageBitmap(bitmap); ByteArrayOutputStream stream = new ByteArrayOutputStream(); bitmap.compress(CompressFormat.PNG, 90, stream); // compress // to which // format // you want. int bytes = bitmap.getWidth()*bitmap.getHeight()*4; //calculate how many bytes our image consists of. Use a different value than 4 if you don't use 32bit images. ByteBuffer byteBuffer = ByteBuffer.allocate(bytes); bitmap.copyPixelsToBuffer(byteBuffer); byte[] byte_arr = byteBuffer.array();//stream.toByteArray(); String image_str = Base64.encodeBytes(byte_arr); ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(); nameValuePairs.add(new BasicNameValuePair("image", image_str)); try { HttpClient httpclient = new DefaultHttpClient(); HttpPost httppost = new HttpPost( "http://192.168.1.4/Upload_image_ANDROID/upload_image.php"); httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs)); HttpResponse response = httpclient.execute(httppost); String the_string_response = convertResponseToString(response); Toast.makeText(ImageGalleryDemoActivity.this, "Response " + the_string_response, Toast.LENGTH_LONG) .show(); } catch (Exception e) { Toast.makeText(ImageGalleryDemoActivity.this, "ERROR " + e.getMessage(), Toast.LENGTH_LONG) .show(); System.out.println("Error in http connection " + e.getClass().getName() + " " + e.toString()); } } catch (Exception e) { Toast.makeText( ImageGalleryDemoActivity.this, "ERROR " + e.getClass().getName() + " " + e.getMessage(), Toast.LENGTH_LONG).show(); System.out.println("Error in http connection " + e.toString()); } } } public String convertResponseToString(HttpResponse response) throws IllegalStateException, IOException { String res = ""; StringBuffer buffer = new StringBuffer(); inputStream = response.getEntity().getContent(); int contentLength = (int) response.getEntity().getContentLength(); // getting // content // length….. Toast.makeText(ImageGalleryDemoActivity.this, "contentLength : " + contentLength, Toast.LENGTH_LONG).show(); if (contentLength < 0) { } else { byte[] data = new byte[512]; int len = 0; try { while (-1 != (len = inputStream.read(data))) { buffer.append(new String(data, 0, len)); // converting to // string and // appending to // stringbuffer….. } } catch (IOException e) { e.printStackTrace(); } try { inputStream.close(); // closing the stream….. } catch (IOException e) { e.printStackTrace(); } res = buffer.toString(); // converting stringbuffer to string….. Toast.makeText(ImageGalleryDemoActivity.this, "Result : " + res, Toast.LENGTH_LONG).show(); // System.out.println("Response => " + // EntityUtils.toString(response.getEntity())); } return res; } } </code></pre> <p>upload image.php</p> <pre><code><?php $base=$_REQUEST['image']; $binary=base64_decode($base); header('Content-Type: bitmap; charset=utf-8'); $file = fopen('uploaded_image.jpg', 'wb'); fwrite($file, $binary); fclose($file); echo 'Image upload complete!!, Please check your php file directory……'; ?> </code></pre>

Querying!

Guidance

An individual column

Larger individual text columns get their own page to allow for proper reading.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload