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通過MethodChannel與安卓原生進行通信

Flutter代碼：

先寫一個通道類督禽，定義通道名(plugin_demo)和方法名(jumpToActivity)巍棱，通道是異步的所以要用async await

class PluginManager {
  static const MethodChannel _channel =
      const MethodChannel('plugin_demo');

  static Future<String> pushFirstActivity(Map params) async {
    String resultStr = await _channel.invokeMethod('jumpToActivity', params);
    return resultStr;
  }
}

隨便寫個按鈕調(diào)用通道:

onPressed: () async {
    String resultString;
    try {
      resultString = await PluginManager.pushFirstActivity({'key': 'value'});
    } on PlatformException {
      resultString = '失敗';
    }
    print(resultString);
}

安卓代碼：

找到項目中的安卓MainActivity丛忆，點擊右上角的在Android Studio中打開，等待gradle自動配置好贞远，紅色報錯就沒了

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MainActivity代碼：

package com.example.flutter_jumpto_android;

import android.content.Intent;

import io.flutter.embedding.android.FlutterActivity;
import androidx.annotation.NonNull;
import io.flutter.embedding.engine.FlutterEngine;
import io.flutter.plugin.common.MethodCall;
import io.flutter.plugin.common.MethodChannel;
import io.flutter.plugins.GeneratedPluginRegistrant;

public class MainActivity extends FlutterActivity {
    private static final String CHANNEL = "plugin_demo";

    @Override
    public void configureFlutterEngine(@NonNull FlutterEngine flutterEngine) {
        GeneratedPluginRegistrant.registerWith(flutterEngine);
        new MethodChannel(flutterEngine.getDartExecutor(), CHANNEL).setMethodCallHandler(
                new MethodChannel.MethodCallHandler() {
                    @Override
                    public void onMethodCall(MethodCall call, MethodChannel.Result result) {
                        if (call.method.equals("jumpToActivity")) {
                            // 參數(shù)
                            String params = call.argument("key");

                            // 跳轉(zhuǎn)
                            Intent intent = new Intent(MainActivity.this, FirstActivity.class);
                            intent.putExtra("activityKey", params);
                            startActivity(intent);

                            result.success(params);
                        } else {
                            result.notImplemented();
                        }
                    }
                });
    }
}

在我們監(jiān)聽了指定channel(plugin_demo)蹬刷，onMethodCall中會收到來自flutter的通道信息瓢捉，根據(jù)不同方法名處理不同事件，比如我們監(jiān)聽到j(luò)umpToActivity方法：

if (call.method.equals("jumpToActivity")) {
      // 參數(shù)
      String params = call.argument("key");

      // 跳轉(zhuǎn)
      Intent intent = new Intent(MainActivity.this, FirstActivity.class);
      intent.putExtra("activityKey", params);
      startActivity(intent);

      result.success(params);
}

call.argument("key")可以獲取指定key的值办成，call.arguments可以獲取全部參數(shù)泡态，然后使用Intent跳轉(zhuǎn)：

Intent intent = new Intent(MainActivity.this, FirstActivity.class);
intent.putExtra("activityKey", params);
startActivity(intent);

處理通道消息后需要調(diào)用result.success把通信結(jié)果傳給flutter

result.success("success");

順便一問，我這跳轉(zhuǎn)的Activity都沒有返回鍵怎么回事迂卢，雕大的解答下：

public class FirstActivity extends Activity {