android 让 webview 支持HTML中的 <input type='file'>

 /**
         * 上传文件file控件监控
         * */
        wv.setWebChromeClient(new MyWebChromeClient(){

		});

 /**
     * 监控文件选择
     * @author Administrator
     *
     */
    class MyWebChromeClient extends WebChromeClient {
        // The undocumented magic method override
        // Eclipse will swear at you if you try to put @Override here
        public void openFileChooser(ValueCallback<Uri> uploadMsg) {

            mUploadMessage = uploadMsg;
            Intent i = new Intent(Intent.ACTION_GET_CONTENT);
            i.addCategory(Intent.CATEGORY_OPENABLE);
            i.setType("image/*");
            AiappActivity.this.startActivityForResult(
                    Intent.createChooser(i, "Image Browser"),
                    FILECHOOSER_RESULTCODE);
        }
    }
    /**
     * 返回文件选择
     */
    @Override
    protected void onActivityResult(int requestCode, int resultCode,
            Intent intent) {
        if (requestCode == FILECHOOSER_RESULTCODE) {
            if (null == mUploadMessage)
                return;
            Uri result = intent == null || resultCode != RESULT_OK ? null
                    : intent.getData();
            mUploadMessage.onReceiveValue(result);
            mUploadMessage = null;
     
        }
    }