Android WebView H5页面 input type =“file”解决方法

转载请注明出处
http://blog.csdn.net/u014513456/article/details/53645560
背景
在android WebView中需要做一个拍照片上传照片的活动，H5 用了input type=“file” 点击后客户端无反映，特有此解决方案。

//以下全局变量要加private ValueCallback<Uri> mUploadMessage;public ValueCallback<Uri[]> uploadMessage;public static final int REQUEST_SELECT_FILE = 100;private final static int FILECHOOSER_RESULTCODE = 2;//以下方法要在 webView.loadUrl(url);之前调用//将webview传进来 走一下下面封装好的方法就好了void setH5Camera(WebView v) {    v.setWebChromeClient(new WebChromeClient() {        // For 3.0+ Devices (Start)        // onActivityResult attached before constructor        protected void openFileChooser(ValueCallback uploadMsg, String acceptType) {            mUploadMessage = uploadMsg;            Intent i = new Intent(Intent.ACTION_GET_CONTENT);            i.addCategory(Intent.CATEGORY_OPENABLE);            i.setType("image/*");            startActivityForResult(Intent.createChooser(i, "File Browser"), FILECHOOSER_RESULTCODE);        }        // For Lollipop 5.0+ Devices        @TargetApi(Build.VERSION_CODES.LOLLIPOP)        public boolean onShowFileChooser(WebView mWebView, ValueCallback<Uri[]> filePathCallback, WebChromeClient.FileChooserParams fileChooserParams) {            if (uploadMessage != null) {                uploadMessage.onReceiveValue(null);                uploadMessage = null;            }            uploadMessage = filePathCallback;            Intent intent = fileChooserParams.createIntent();            try {                startActivityForResult(intent, REQUEST_SELECT_FILE);            } catch (ActivityNotFoundException e) {                uploadMessage = null;                Toast.makeText(getBaseContext(), "Cannot Open File Chooser", Toast.LENGTH_LONG).show();                return false;            }            return true;        }        //For Android 4.1 only        protected void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture) {            mUploadMessage = uploadMsg;            Intent intent = new Intent(Intent.ACTION_GET_CONTENT);            intent.addCategory(Intent.CATEGORY_OPENABLE);            intent.setType("image/*");            startActivityForResult(Intent.createChooser(intent, "File Browser"), FILECHOOSER_RESULTCODE);        }        protected void openFileChooser(ValueCallback<Uri> uploadMsg) {            mUploadMessage = uploadMsg;            Intent i = new Intent(Intent.ACTION_GET_CONTENT);            i.addCategory(Intent.CATEGORY_OPENABLE);            i.setType("image/*");            startActivityForResult(Intent.createChooser(i, "File Chooser"), FILECHOOSER_RESULTCODE);        }    });}//当然调用系统相机或相册需要回到当前页面 需要把回传值处理一下@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {    super.onActivityResult(requestCode, resultCode, data);    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {        if (requestCode == REQUEST_SELECT_FILE) {            if (uploadMessage == null)                return;            uploadMessage.onReceiveValue(WebChromeClient.FileChooserParams.parseResult(resultCode, data));            uploadMessage = null;        }    } else if (requestCode == FILECHOOSER_RESULTCODE) {        if (null == mUploadMessage)            return;        Uri result = data == null || resultCode != MainActivity.RESULT_OK ? null : data.getData();        mUploadMessage.onReceiveValue(result);        mUploadMessage = null;    } else {        Toast.makeText(getBaseContext(), "Failed to Upload Image", Toast.LENGTH_LONG).show();    }}