最近因为赶项目进度，因此将本来要用原生控件实现的界面，自己做了H5并嵌入webview中。发现点击H5中 input type="file" 标签 不能打开android资源管理器。

通过网络搜索发现是因为 android webview 由于考虑安全原因屏蔽了 input type="file" 这个功能 。

经过不懈的努力，以及google 翻译的帮助 在 * 中找到了解决的方法。

具体可以理解为 重写webview 的WebChromeClient ，废话不多说直接贴代码:

private ValueCallback<Uri> mUploadMessage;

public ValueCallback<Uri[]> uploadMessage;

public static final int REQUEST_SELECT_FILE = 100;

private final static int FILECHOOSER_RESULTCODE = 2;

webview.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);

        }

    });

}

@Override

public void onActivityResult(int requestCode, int resultCode, Intent intent)

{

    if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP)

    {

        if (requestCode == REQUEST_SELECT_FILE)

        {

            if (uploadMessage == null)

                return;

            uploadMessage.onReceiveValue(WebChromeClient.FileChooserParams.parseResult(resultCode, intent));

            uploadMessage = null;

        }

    }

    else if (requestCode == FILECHOOSER_RESULTCODE)

    {

        if (null == mUploadMessage)

            return;

        // Use MainActivity.RESULT_OK if you're implementing WebView inside Fragment

        // Use RESULT_OK only if you're implementing WebView inside an Activity

        Uri result = intent == null || resultCode != MainActivity.RESULT_OK ? null : intent.getData();

        mUploadMessage.onReceiveValue(result);

        mUploadMessage = null;

    }

    else

        Toast.makeText(getBaseContext(), "Failed to Upload Image", Toast.LENGTH_LONG).show();

}