Android

去掉Actionbar

android:name="com.cheezgroup.tosharing.MainActivity"
android:theme="@style/Theme.AppCompat.NoActionBar"

MethodChannel

https://www.jianshu.com/p/1770ded8f50f

package com.cheezgroup.tosharing


import android.annotation.SuppressLint
import android.content.Intent
import android.os.Bundle
import androidx.annotation.NonNull
import androidx.appcompat.app.AppCompatActivity
import androidx.fragment.app.Fragment
import com.cheezgroup.tosharing.myapplication.R
import io.flutter.embedding.android.FlutterFragment
import io.flutter.embedding.engine.FlutterEngine
import io.flutter.embedding.engine.FlutterEngineCache
import io.flutter.embedding.engine.dart.DartExecutor
import io.flutter.plugin.common.MethodChannel

/**
 * @author  zhengyongbo
 * @since 2020-03-18 12:29
 */
const val FRAGMENT_TAG = "F"
const val ENGINE_ID = "a"
val FLUTTER_CHANNEL = "sample.flutter.io/test"

class MainActivity : AppCompatActivity() {
    var flutterFragment: FlutterFragment? = null
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_sample)

        initFlutterEngine()
        attachFlutterFragment()
    }

    private fun initFlutterEngine(): FlutterEngine {
        var flutterEngine = FlutterEngineCache.getInstance().get(ENGINE_ID)

        if (null == flutterEngine) {
            flutterEngine = FlutterEngine(this)
            flutterEngine.navigationChannel.setInitialRoute("/")
            flutterEngine.dartExecutor.executeDartEntrypoint(
                    DartExecutor.DartEntrypoint.createDefault()
            )
            FlutterEngineCache
                    .getInstance()
                    .put(ENGINE_ID, flutterEngine)
            setMethodChannels(flutterEngine)
        }
        return flutterEngine
    }

    private fun attachFlutterFragment() {
        if (null == flutterFragment) {
            flutterFragment =
                    FlutterFragment.withCachedEngine(ENGINE_ID)
                            .shouldAttachEngineToActivity(true)
                            .build() as FlutterFragment
        }
        supportFragmentManager
                .beginTransaction()
                .add(R.id.flutter_fragment_container,
                        flutterFragment as Fragment,
                        FRAGMENT_TAG
                ).commit()
    }

    private fun setMethodChannels(flutterEngine: FlutterEngine) {
        MethodChannel(flutterEngine.dartExecutor, FLUTTER_CHANNEL).setMethodCallHandler { call, result ->
            when (call.method) {
                "getAcivityResult" -> {
                    val params = HashMap<String, String>()
                    params.put("s", "sssss")
                    result.success(params)
                }
                else -> result.notImplemented()
            }
        }
    }

    override fun onPostResume() {
        super.onPostResume()
        flutterFragment!!.onPostResume()
    }

    @SuppressLint("MissingSuperCall")
    override fun onNewIntent(@NonNull intent: Intent) {
        flutterFragment!!.onNewIntent(intent)
    }

    override fun onBackPressed() {
        flutterFragment!!.onBackPressed()
    }

    override fun onRequestPermissionsResult(
            requestCode: Int,
            permissions: Array<String?>,
            grantResults: IntArray
    ) {
        flutterFragment!!.onRequestPermissionsResult(
                requestCode,
                permissions,
                grantResults
        )
    }

    override fun onUserLeaveHint() {
        flutterFragment!!.onUserLeaveHint()
    }

    override fun onTrimMemory(level: Int) {
        super.onTrimMemory(level)
        flutterFragment!!.onTrimMemory(level)
    }

}

flutter

static const MethodChannel methodChannel = MethodChannel("sample.flutter.io/test");

  Future<void> _getActivityResult() async {
    String result;
    try {
      final Map<dynamic, dynamic> map = await methodChannel.invokeMethod('getAcivityResult'); //通过getAcivityResult传递方法名称，类似于广播中的action
      result = 'getAcivityResult : ${map["s"]} ';

      print("ssss"+result);
    } on PlatformException {
      result = 'Failed to get battery level.';
    }
    setState(() {
//    _result = result;
    });
  }