Android 解决WebView无法上传文件的问题

android 解决webview无法上传文件的问题

android原生的webview并不支持上传文件，需要我们自己实现相应的方法。于是我把工作中的相关代码记录下来。下次直接拿来用就行了。一点一滴都是经验。

1。需要定义三个变量

 private valuecallback<uri[]> uploadmessageabovel;
  private final static int file_chooser_result_code = 10000;
  private valuecallback<uri> uploadmessage;

2.重写activity相关方法

  private void openimagechooseractivity() {
    intent i = new intent(intent.action_get_content);
    i.addcategory(intent.category_openable);
    i.settype("image/*");
    startactivityforresult(intent.createchooser(i, "image chooser"), file_chooser_result_code);
  }


  @override
  protected void onactivityresult(int requestcode, int resultcode, intent data) {
    super.onactivityresult(requestcode, resultcode, data);
    if (requestcode == file_chooser_result_code) {
      if (null == uploadmessage && null == uploadmessageabovel) return;
      uri result = data == null || resultcode != result_ok ? null : data.getdata();
      if (uploadmessageabovel != null) {
        onactivityresultabovel(requestcode, resultcode, data);
      } else if (uploadmessage != null) {
        uploadmessage.onreceivevalue(result);
        uploadmessage = null;
      }
    }
  }


  @targetapi(build.version_codes.lollipop)
  private void onactivityresultabovel(int requestcode, int resultcode, intent intent) {
    if (requestcode != file_chooser_result_code || uploadmessageabovel == null)
      return;
    uri[] results = null;
    if (resultcode == activity.result_ok) {
      if (intent != null) {
        string datastring = intent.getdatastring();
        clipdata clipdata = intent.getclipdata();
        if (clipdata != null) {
          results = new uri[clipdata.getitemcount()];
          for (int i = 0; i < clipdata.getitemcount(); i++) {
            clipdata.item item = clipdata.getitemat(i);
            results[i] = item.geturi();
          }
        }
        if (datastring != null)
          results = new uri[]{uri.parse(datastring)};
      }
    }
    uploadmessageabovel.onreceivevalue(results);
    uploadmessageabovel = null;
  }

3.重写webchromeclient中的相关方法

 // for android < 3.0
    public void openfilechooser(valuecallback<uri> valuecallback) {
      uploadmessage = valuecallback;
      openimagechooseractivity();
    }

    // for android >= 3.0
    public void openfilechooser(valuecallback valuecallback, string accepttype) {
      uploadmessage = valuecallback;
      openimagechooseractivity();
    }

    //for android >= 4.1
    public void openfilechooser(valuecallback<uri> valuecallback, string accepttype, string capture) {
      uploadmessage = valuecallback;
      openimagechooseractivity();
    }

    // for android >= 5.0
    @override
    public boolean onshowfilechooser(webview webview, valuecallback<uri[]> filepathcallback, webchromeclient.filechooserparams filechooserparams) {
      uploadmessageabovel = filepathcallback;
      openimagechooseractivity();
      return true;
    }

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