CODEWITHSUNDEEP
flutterdart
Jungwon
Jungwon

Reputation: 996

flutter Drawing text when calling flutter code in java

I have succeeded in calling a flutter method in Java using 'MethodChannel'.

Java Code

if(call.method.equals("drawFont")){
   int res = callFlutterMethod(0xF020);
   System.out.println("drawFont Result : " + res);
}

///Call Flutter Method
public static void callFlutterMethod(int nFontData){
   channel.invokeMethod("drawFont", nFontData);
   System.out.println("pass FontData!!");
}

Flutter Code

 onListener(){
    platform.setMethodCallHandler((call) async{
      if(call.method == 'drawFont'){
        print('call java drawFont : ${call.arguments}');
        return Text(String.fromCharCode(call.arguments));
      }
    });
    return Text('Listener Failed');
  }

The problem is that whenever I call the flutter method with methodChannel in java, I want the widget to be created. If there is a way, please give me a simple example code. Thank you.

Example

Column(
  children: [
    //call Widget Text
  ],
)

Upvotes: 0

Views: 40

Answers (1)

powerman23rus
powerman23rus

Reputation: 1583

For such case you have to use FutureBuilder

Your Java code should be looks like

@Override
  public void configureFlutterEngine(@NonNull FlutterEngine flutterEngine) {
    new MethodChannel(flutterEngine.getDartExecutor(), YOUR_CHANNEL_NAME).setMethodCallHandler(
      new MethodCallHandler() {
        @Override
        public void onMethodCall(MethodCall call, Result result) {
          if (call.method.equals("drawFont")) {
            result.success(0xF020);
        }
      }
    );
  }

Your Flutter code

Column(
  children: [
    FutureBuilder<String>(
        future: platform.invokeMethod('drawFont'), 
        builder: (BuildContext context, AsyncSnapshot<int> snapshot) {
          if (snapshot.hasData) {
            return Text(String.fromCharCode(snapshot.data));
          } else if (snapshot.hasError) {
            return Text('Error');
          } else {
            return Text('Loading');
          }
        }
    ),
  ],
);

Upvotes: 1

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