近期有项目需要在WebView中选择图像上传，结果发现这里头也算是一个深坑了啊，因为安卓版本碎片化严重，导致选择上传文件的方法因各版本不同有所不同，因此会导致各种点击上传文件而出不来选择框的问题，要解决这个问题，就需要对WebChromeClient的很多方法进行重写来完成了。废话不多说，直接上核心代码吧：

首先对WebChromeClient进行设置，代码如下：

            WebSettings settings = webview.getSettings();
            settings.setUseWideViewPort(true);
            settings.setLoadWithOverviewMode(true);
            settings.setJavaScriptEnabled(true);
            webview.setWebChromeClient(new WebChromeClient() {

                // Android 3.0 以下
                public void openFileChooser(ValueCallback<Uri> valueCallback) {
                    uploadMessage = valueCallback;
                    selectImage();
                }

                // Android 3~4.1
                public void openFileChooser(ValueCallback valueCallback, String acceptType) {
                    uploadMessage = valueCallback;
                    selectImage();
                }

                // Android  4.1以上
                public void openFileChooser(ValueCallback<Uri> valueCallback, String acceptType, String capture) {
                    uploadMessage = valueCallback;
                    selectImage();
                }

                // Android 5.0以上
                @Override
                public boolean onShowFileChooser(WebView webView, ValueCallback<Uri[]> filePathCallback, WebChromeClient.FileChooserParams fileChooserParams) {
                    uploadMessageAboveL = filePathCallback;
                    selectImage();
                    return true;
                }
            });

selectImage方法代码如下：

        private void selectImage() {
            Intent i = new Intent(Intent.ACTION_GET_CONTENT);
            i.addCategory(Intent.CATEGORY_OPENABLE);
            i.setType("image/*");
            startActivityForResult(Intent.createChooser(i, "Image Chooser"), 15);
        }

Activity返回信息处理如下：

//全局声明，用于记录选择图片返回的地址值
private ValueCallback<Uri> uploadMessage;
private ValueCallback<Uri[]> uploadMessageAboveL;

//......

        @Override
        protected void onActivityResult(int requestCode, int resultCode, Intent data) {
            super.onActivityResult(requestCode, resultCode, data);
            if (requestCode == 15) {
                if (null == uploadMessage && null == uploadMessageAboveL) return;
                Uri result = data == null || resultCode != RESULT_OK ? null : data.getData();
                if (uploadMessageAboveL != null) {
                    onActivityResultAboveL(requestCode, resultCode, data);
                } else if (uploadMessage != null) {
                    uploadMessage.onReceiveValue(result);
                    uploadMessage = null;
                }
            }
        }

        @TargetApi(Build.VERSION_CODES.LOLLIPOP)
        private void onActivityResultAboveL(int requestCode, int resultCode, Intent intent) {
            if (requestCode != 15 || uploadMessageAboveL == null)
                return;
            Uri[] results = null;
            if (resultCode == Activity.RESULT_OK) {
                if (intent != null) {
                    String dataString = intent.getDataString();
                    ClipData clipData = intent.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)};
                }
            }
            uploadMessageAboveL.onReceiveValue(results);
            uploadMessageAboveL = null;
        }

以上，WebView选择图像的问题完美解决。
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