add content-type parameter for char-stream data in multipart/form-data

add content-type parameter for char-stream data in multipart/form-data &
fix bug of writing wrong last boundary

Author: geminiwen

src/com/loopj/android/http/SimpleMultipartEntity.java

@@ -77,22 +77,32 @@ public void writeLastBoundaryIfNeeds() {
             return;
         }
 
-        writeBoundary();
+        try {
+            out.write(("--" + boundary + "--\r\n").getBytes());
+            out.flush();
+        } catch (final IOException e) {
+            e.printStackTrace();
+        }
 
         isSetLast = true;
     }
 
-    public void addPart(final String key, final String value) {
+    public void addPart(final String key, final String value, final String contentType) {
         writeBoundary();
         try {
-            out.write(("Content-Disposition: form-data; name=\"" +key+"\"\r\n\r\n").getBytes());
+            out.write(("Content-Disposition: form-data; name=\"" +key+"\"\r\n").getBytes());
+            out.write(("Content-Type: " + contentType + "\r\n\r\n").getBytes());
             out.write(value.getBytes());
             out.write(("\r\n").getBytes());
         } catch (final IOException e) {
             e.printStackTrace();
         }
     }
 
+    public void addPart(final String key, final String value) {
+        addPart(key,value,"text/plain; charset=UTF-8");
+    }
+
     public void addPart(final String key, final String fileName, final InputStream fin, final boolean isLast){
         addPart(key, fileName, fin, "application/octet-stream", isLast);
     }
@@ -111,7 +121,7 @@ public void addPart(final String key, final String fileName, final InputStream f
                 out.write(tmp, 0, l);
             }
             out.write(("\r\n").getBytes());
-            out.flush();
+            
         } catch (final IOException e) {
             e.printStackTrace();
         } finally {
@@ -159,6 +169,7 @@ public boolean isStreaming() {
 
     @Override
     public void writeTo(final OutputStream outstream) throws IOException {
+        writeLastBoundaryIfNeeds();
         outstream.write(out.toByteArray());
     }
 
@@ -179,6 +190,7 @@ public void consumeContent() throws IOException,
     @Override
     public InputStream getContent() throws IOException,
     UnsupportedOperationException {
+    	writeLastBoundaryIfNeeds();
         return new ByteArrayInputStream(out.toByteArray());
     }
 }