由于插件未自动附加到活动，Flutter Image Picker 无法正常工作

Question

I have added flutter in an existing Android app and I have been facing issues with Image picker library not working, showing the following error.

Unhandled Exception: MissingPluginException(No implementation found for method pickImage on channel plugins.flutter.io/image_picker_android)

According to the error I understand that it's due to GeneratedPluginRegistrant not being registered and I have to override configureFlutterEngine method. As I need to open the flutter module inside a fragment I cannot extend my activity using FlutterActivity because it does not support getSupportFragmentManager . I tried extending my activity using FlutterFragmentActivity and was able to override configureFlutterEngine method but then faced the following error.

ava.lang.IllegalArgumentException: No view found for id 0x245a3c5c (unknown) for fragment FlutterFragment{647abea (0b17a247-4e8e-42bc-b5f3-6ab0796e458b) id=0x245a3c5c flutter_fragment}

Following are my MainActivity.java and activity_main.xml

MainActivity.java

package com.mch.testplugin;

import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.FrameLayout;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

import io.flutter.embedding.android.FlutterActivity;
import io.flutter.embedding.android.FlutterFragment;
import io.flutter.embedding.android.FlutterFragmentActivity;
import io.flutter.embedding.engine.FlutterEngine;
import io.flutter.embedding.engine.FlutterEngineCache;
import io.flutter.embedding.engine.dart.DartExecutor;
import io.flutter.plugins.GeneratedPluginRegistrant;

public class MainActivity extends AppCompatActivity {

Context mContext;
FlutterFragment flutterFragment;
private static final String TAG_FLUTTER_FRAGMENT = "flutter_fragment";
FlutterEngine mFlutterEngine;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    mContext = this;
    setContentView(R.layout.activity_main);

    Button myButton = findViewById(R.id.myButton);
    myButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            flutterFragment = (FlutterFragment) getSupportFragmentManager()
                    .findFragmentByTag(TAG_FLUTTER_FRAGMENT);

            // Create and attach a FlutterFragment if one does not exist.
            if (flutterFragment == null) {
                flutterFragment = FlutterFragment.createDefault();

                flutterFragment = FlutterFragment.withNewEngine()
                        .initialRoute("/")
                        .build();

                getSupportFragmentManager()
                        .beginTransaction()
                        .add(
                                R.id.frame_layout,
                                flutterFragment,
                                TAG_FLUTTER_FRAGMENT
                        )
                        .commit();


            }
    });

}


//    @Override
//    public void configureFlutterEngine(@NonNull FlutterEngine flutterEngine) {
////        super.configureFlutterEngine(flutterEngine);
//        mFlutterEngine = flutterEngine;
//        GeneratedPluginRegistrant.registerWith(new FlutterEngine(this));
//    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout       xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">

<Button
    android:id="@+id/myButton"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Hello World!" />

<FrameLayout
    android:id="@+id/frame_layout"
    android:layout_width="match_parent"
    android:layout_height="200dp" />

</androidx.constraintlayout.widget.ConstraintLayout>'

Can someone please guide me the right way to do this? Your help is much appreciated.

Answer 1

类似问题的通常解决方案是简单地停止应用程序并再次按下运行按钮