android webview js交互 调取本地相册（兼容各个版本）并且上传到服务器端。

       android webview  js交互，调取本地相册，并且实现上传。

      

     首先我们要理解整个互动过程，在网页webview的的组件是 input输入框，输入类型为file,点击-----> 调用安卓不同的版本

onShowFileChooser（5.0专用的方法，是隐性的），
openFileChooser（3.0,4.0）这些都要写进去，是为了针对不同的安卓版本。
----->启动android系统自带的相册选择 ---->选择完成之后，回调 onActivityResult，这个方法很重要，里面有针对不同安卓版本的处理，特别是5.0 ，返回来的是一个URI数组，需要进行处理。 废话不说上代码：
 
webView.setWebChromeClient(new WebChromeClient() {
            @Override
            public boolean onJsAlert(WebView view, String url, String message, final JsResult result) {
                AlertDialog.Builder b2 = new AlertDialog.Builder(WebViewActivity.this)
                        .setTitle("友情提示：").setMessage(message)
                        .setPositiveButton("ok",
                                new AlertDialog.OnClickListener() {
                                    @Override
                                    public void onClick(DialogInterface dialog,
                                                        int which) {
                                        result.confirm();
                                        // MyWebView.this.finish();
                                    }
                                });
                b2.setCancelable(false);
                b2.create();
                b2.show();
                return true;
            }

            @Override
            public boolean onShowFileChooser(WebView webView, ValueCallback<Uri[]> filePathCallback, FileChooserParams fileChooserParams) {

                umUploadMessages = filePathCallback;
                mfileChooserParams = fileChooserParams;
                Intent i = new Intent(Intent.ACTION_GET_CONTENT);
                i.addCategory(Intent.CATEGORY_OPENABLE);
                i.putExtra("return-data", true);
                i.setType("image/*");
                i.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
                        "image/*");
                startActivityForResult(Intent.createChooser(i, "选择相册"),
                        FILECHOOSER_RESULTCODE_5);
                return true;
            }

            // For Android 3.0
            public void openFileChooser(ValueCallback<Uri> uploadMsg) {
                mUploadMessage = uploadMsg;
                Intent i = new Intent(Intent.ACTION_GET_CONTENT);
                i.addCategory(Intent.CATEGORY_OPENABLE);
                i.putExtra("return-data", true);
                i.setType("image/*");
                i.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
                        "image/*");

                startActivityForResult(Intent.createChooser(i, "选择相册"),
                        FILECHOOSER_RESULTCODE);
            }

            // For Android > 4.1
            public void openFileChooser(ValueCallback<Uri> uploadMsg,
                                        String acceptType, String capture) {
                Toast.makeText(WebViewActivity.this,"你大爷的",Toast.LENGTH_SHORT).show();
                mUploadMessage = uploadMsg;
                Intent i = new Intent(Intent.ACTION_GET_CONTENT);
                i.addCategory(Intent.CATEGORY_OPENABLE);
                i.putExtra("return-data", true);
                i.setType("image/*");
                i.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
                        "image/*");
                startActivityForResult(Intent.createChooser(i, "选择相册"),
                        FILECHOOSER_RESULTCODE);
            }

            // Andorid 3.0 +
            public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType) {
                 mUploadMessage = uploadMsg;
                Intent i = new Intent(Intent.ACTION_GET_CONTENT);
                i.addCategory(Intent.CATEGORY_OPENABLE);
                i.putExtra("return-data", true);
                i.setType("image/*");
                i.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
                        "image/*");
                startActivityForResult(Intent.createChooser(i, "选择相册"),
                        FILECHOOSER_RESULTCODE);
            }
        });
 
回调处理：

  

 /**  * 取照片完成之后的回选调  */  @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == FILECHOOSER_RESULTCODE) {
            if (null == mUploadMessage) return;
            if (null == data){
                mUploadMessage.onReceiveValue(null);
                mUploadMessage = null;
            }else{
                Uri result = data == null || resultCode != RESULT_OK ? null
                        : data.getData();
                mUploadMessage.onReceiveValue(result);
                mUploadMessage = null;
            }
        }else  if (requestCode == FILECHOOSER_RESULTCODE_5){// 5.0适配，主要是因为5.0的返回参数不同。
            // 处理5.0的callback
            if (umUploadMessages != null) {
                if (null != data) {
// 5.0的处理方式不同，要注意。
                    ArrayList<String> resultList = data
                            .getStringArrayListExtra("data");

                    umUploadMessages.onReceiveValue(
                            mfileChooserParams.parseResult(resultCode, data));
                    umUploadMessages = null;
                } else {
                    umUploadMessages.onReceiveValue(null);
                }
            }
        }
    }