androidのwebViewでinput type fileに対応する

samplewebview

private final static int FILECHOOSER_RESULTCODE = 1;
private ValueCallback<Uri> mUploadMessage;
private WebView webView = new WebView(this);

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    webview.setWebChromeClient(new WebChromeClient() {
        //androidOS 4.1
        public void openFileChooser(ValueCallback<Uri> uploadMsg, String     acceptType,String capture) {
            mUploadMessage = uploadMsg;
            Intent i = new Intent(Intent.ACTION_GET_CONTENT);
            i.addCategory(Intent.CATEGORY_OPENABLE);
            i.setType("image/*");
            startActivityForResult( Intent.createChooser( i, "title" ), FILECHOOSER_RESULTCODE );
        }
        //androidOS 3.0 以上
        public void openFileChooser( ValueCallback<Uri> uploadMsg, String acceptType){
            openFileChooser( uploadMsg, acceptType ,"" );
         }
        //androidOS 3.0未満
        public void openFileChooser(ValueCallback<Uri> uploadMsg) {
            openFileChooser( uploadMsg, "","" );
        }
    });
    webView.loadUrl("URL");
}
@Override
protected void onActivityResult(int requestCode, int resultCode,Intent intent) {
    if (requestCode == FILECHOOSER_RESULTCODE) {
        if ( mUploadMessage == null ){
            return;
        }
        Uri result = (intent == null || resultCode != RESULT_OK) ? null : intent.getData();
        mUploadMessage.onReceiveValue(result);
        mUploadMessage = null;
    }
}