安卓向django服务器上传图片

问题描述

服务器端用django编写，能否在android端向服务器传图片？
前提是web向django服务器传图片已经利用表单实现．

可行方案

1. android 将图片转为字节流发送，在服务器端解析
2. android 内嵌h5直接利用表单实现

方案1

android 端将图片转为字节流并发送至服务器，服务器解析失败，或许存在解析的方法，但是没有从网上找到，而且服务器端request.POST 接收到的默认是python字典模式，打印一下接收到的内容发现乱码，并且不止一个键值对，一脸懵逼．

方案2

android 内嵌网页实现起来比较简单．但是file 类型的input 在android中无法正常使用，百度了一下，找到了解决方案．

AndroidManifest.xml中添加代码

添加位置为<manifest></manifest>之间

<uses-permission android:name="android.permission.INTERNET"></uses-permission>

重写setWebClient方法

myWebView.setWebChromeClient(new WebChromeClient() {
            @Override
            public boolean onShowFileChooser(WebView webView, ValueCallback<Uri[]> filePathCallback, FileChooserParams fileChooserParams) {
                mUploadCallbackAboveL = filePathCallback;
                take();
                return true;
            }

            //<3.0
            public void openFileChooser(ValueCallback<Uri> uploadMsg) {
                mUploadMessage = uploadMsg;
                take();
            }
            //>3.0+
            public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType) {
                mUploadMessage = uploadMsg;
                take();
            }
            //>4.1.1
            public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture) {
                mUploadMessage = uploadMsg;
                take();
            }
       });

并在MainActivity中添加新方法

@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == FILECHOOSER_RESULTCODE) {
            if (null == mUploadMessage && null == mUploadCallbackAboveL) return;
            Uri result = data == null || resultCode != RESULT_OK ? null : data.getData();
            if (mUploadCallbackAboveL != null) {
                onActivityResultAboveL(requestCode, resultCode, data);
            } else if (mUploadMessage != null) {
                Log.e("result", result + "");
                if (result == null) {
                    mUploadMessage.onReceiveValue(imageUri);
                    mUploadMessage = null;
                    Log.e("imageUri", imageUri + "");
                } else {
                    mUploadMessage.onReceiveValue(result);
                    mUploadMessage = null;
                }
            }
        }
    }

@SuppressWarnings("null")
    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    private void onActivityResultAboveL(int requestCode, int resultCode, Intent data) {
        if (requestCode != FILECHOOSER_RESULTCODE || mUploadCallbackAboveL == null) {
            return;
        }

        Uri[] results = null;
        if (resultCode == Activity.RESULT_OK) {
            if (data == null) {
                results = new Uri[]{imageUri};
            } else {
                String dataString = data.getDataString();
                ClipData clipData = data.getClipData();
                if (clipData != null) {
                    results = new Uri[clipData.getItemCount()];
                    for (int i = 0; i < clipData.getItemCount(); i++) {
                        ClipData.Item item = clipData.getItemAt(i);
                        results[i] = item.getUri();
                    }
                }
                if (dataString != null)
                    results = new Uri[]{Uri.parse(dataString)};
            }
        }
        if (results != null) {
            mUploadCallbackAboveL.onReceiveValue(results);
            mUploadCallbackAboveL = null;
        } else {
            results = new Uri[]{imageUri};
            mUploadCallbackAboveL.onReceiveValue(results);
            mUploadCallbackAboveL = null;
        }
        return;
    }

private void take() {
        File imageStorageDir = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES), "MyApp");
        if (!imageStorageDir.exists()) {
            imageStorageDir.mkdirs();
        }
        File file = new File(imageStorageDir + File.separator + "IMG_" + String.valueOf(System.currentTimeMillis()) + ".jpg");
        imageUri = Uri.fromFile(file);
        final List<Intent> cameraIntents = new ArrayList<Intent>();
        final Intent captureIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
        final PackageManager packageManager = getPackageManager();
        final List<ResolveInfo> listCam = packageManager.queryIntentActivities(captureIntent, 0);
        for (ResolveInfo res : listCam) {
            final String packageName = res.activityInfo.packageName;
            final Intent i = new Intent(captureIntent);
            i.setComponent(new ComponentName(res.activityInfo.packageName, res.activityInfo.name));
            i.setPackage(packageName);
            i.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
            cameraIntents.add(i);
        }
        Intent i = new Intent(Intent.ACTION_GET_CONTENT);
        i.addCategory(Intent.CATEGORY_OPENABLE);
        i.setType("image/*");
        Intent chooserIntent = Intent.createChooser(i, "Image Chooser");
        chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, cameraIntents.toArray(new Parcelable[]{}));
        startActivityForResult(chooserIntent, FILECHOOSER_RESULTCODE);
    }

好的，file 类型的input 在android 中无法使用的问题得到解决．但是又出现了新的问题，android 中内嵌的网页表单提交功能无效，点击提交按钮没有反应．没有找到解决方案！

继续探索

百度上搜＂安卓上传图片到django＂，意外的惊喜，感觉这个比较靠谱．

方案3

http://blog.csdn.net/tr1ue/article/details/38339165