flutter 端
const platform = MethodChannel('samples.flutter.dev/battery');

Future _upLoadVideo(String path) async {
OSS oss= Global.mediaOss;
String videoid = "1";
try {
final String result = await platform.invokeMethod('upLoadVideo',{"path":path,"accessKeyId":oss.accessKeyId,
"accessKeySecret":oss.accessKeySecret,"securityToken":oss.securityToken,"expiration":oss.expiration.toString()});
print("result:" + result);
return result;
} on PlatformException catch (e) {
print("result:" + e.message.toString());
}
print("result:" + videoid);

return videoid;
}

android端
private static final String CHANNEL = "samples.flutter.dev/battery";

@Override
public void configureFlutterEngine(@NonNull FlutterEngine flutterEngine) {
    super.configureFlutterEngine(flutterEngine);
    new MethodChannel(flutterEngine.getDartExecutor().getBinaryMessenger(), CHANNEL)
            .setMethodCallHandler(
                    (call, result) -> {
                        // Note: this method is invoked on the main thread.
                        if (call.method.equals("getBatteryLevel")) {
                            result.success(100);

// if ((String) call.argument("inputText") != null) {
// result.success(getJavaText((String) call.argument("inputText"), (int) call.argument("anotherArgument")));
// } else {
// result.error("UNAVAILABLE", "This Method is not available now.", null);
// }
} else if (call.method.equals("upLoadVideo")) {
//初始化短视频上传对象
// accessKeyId = (String) call.argument("accessKeyId");
// accessKeySecret = (String) call.argument("accessKeySecret");
// securityToken = (String) call.argument("securityToken");
// expriedTime = (String) call.argument("expiration");
String path = (String) call.argument("path");
// Log.e("TAG", path + "----" + this.accessKeyId + "--" +this.accessKeySecret+"----"+this.securityToken+"----"+this.expriedTime);
// uploadVideo(path.replace("/data/user/0/","/data/data/"), result);

                            if (path != null) {
                                uploadVideo(path.replace("/data/user/0/","/data/data/"), result);
                                Log.e("TAG", path + "----" + this.accessKeyId + "--" +this.accessKeySecret+"----"+this.securityToken+"----"+this.expriedTime);
                            } else {
                                result.error("UNAVAILABLE", "视频路径错误，请重试", null);
                            }
                        } else {
                            result.notImplemented();
                        }
                    }
            );
}