Flutter3引用原生播放器-Android篇

Posted 2023-03-07 白玉梁

接上篇：Flutter3引用原生播放器-IOS(Swift)篇

安卓端原生播放器的接入思路与ios基本一致，所以本篇就不废话了，直接上代码：

创建插件VideoViewPlugin实现FlutterPlugin：

package io.flutter.plugins.videoplayer;

import android.util.Log;

import androidx.annotation.NonNull;

import io.flutter.embedding.engine.plugins.FlutterPlugin;
import io.flutter.embedding.engine.plugins.activity.ActivityAware;
import io.flutter.embedding.engine.plugins.activity.ActivityPluginBinding;

public class VideoViewPlugin implements FlutterPlugin, ActivityAware 

    private final static String TAG = "VideoViewPlugin";
    FlutterPluginBinding fpBinding;

    @Override
    public void onAttachedToEngine(@NonNull FlutterPluginBinding binding) 
        fpBinding = binding;
        Log.e(TAG, "onAttachedToEngine");
    

    @Override
    public void onDetachedFromEngine(@NonNull FlutterPluginBinding binding) 
        Log.e(TAG, "onDetachedFromEngine");
    

    @Override
    public void onAttachedToActivity(@NonNull ActivityPluginBinding apBinding) 
        fpBinding.getPlatformViewRegistry().registerViewFactory("plugins.my_video_player/view", new VideoViewFactory(fpBinding, apBinding));
        Log.e(TAG, "onAttachedToActivity");
    

    @Override
    public void onDetachedFromActivityForConfigChanges() 
        Log.e(TAG, "onDetachedFromActivityForConfigChanges");
    

    @Override
    public void onReattachedToActivityForConfigChanges(@NonNull ActivityPluginBinding binding) 
        Log.e(TAG, "onReattachedToActivityForConfigChanges");
    

    @Override
    public void onDetachedFromActivity() 
        Log.e(TAG, "onDetachedFromActivity");
    

由于引用视频播放器时需要用到Activity的context，所以实现了ActivityAware接口，在onAttachedToActivity方法中注册PlatformViewFactory！

创建VideoViewFactory实现PlatformViewFactory：

package io.flutter.plugins.videoplayer;

import android.content.Context;

import io.flutter.Log;
import io.flutter.embedding.engine.plugins.FlutterPlugin;
import io.flutter.embedding.engine.plugins.activity.ActivityPluginBinding;
import io.flutter.plugin.common.StandardMessageCodec;
import io.flutter.plugin.platform.PlatformView;
import io.flutter.plugin.platform.PlatformViewFactory;

public class VideoViewFactory extends PlatformViewFactory 
    private final static String TAG = "VideoViewFactory";
    private final FlutterPlugin.FlutterPluginBinding fpBinding;
    private final ActivityPluginBinding apBinding;

    public VideoViewFactory(FlutterPlugin.FlutterPluginBinding fpBinding, ActivityPluginBinding apBinding) 
        super(StandardMessageCodec.INSTANCE);
        Log.e(TAG, "VideoViewFactory");
        this.fpBinding = fpBinding;
        this.apBinding = apBinding;
    

    @Override
    public PlatformView create(Context context, int viewId, Object args) 
        Log.e(TAG, "PlatformView-create:" + args.toString());
        return new VideoViewPlayer(args.toString(), fpBinding, apBinding);
    

创建VideoViewPlayer，实现PlatformView和MethodChannel.MethodCallHandler：

package io.flutter.plugins.videoplayer;

import android.app.Activity;
import android.content.Context;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;

import com.th.kjjl_flutter.R;
import com.videoplayer.player.VideoView;

import io.flutter.embedding.engine.plugins.FlutterPlugin;
import io.flutter.embedding.engine.plugins.activity.ActivityPluginBinding;
import io.flutter.plugin.common.MethodCall;
import io.flutter.plugin.common.MethodChannel;
import io.flutter.plugin.platform.PlatformView;

public class VideoViewPlayer implements PlatformView, MethodChannel.MethodCallHandler 
    private final static String TAG = "VideoPlayerView";
    Activity context;
    private VideoView videoView;
    private MethodChannel methodChannel;

    VideoViewPlayer(String viewId, FlutterPlugin.FlutterPluginBinding fpBinding, ActivityPluginBinding apBinding) 
        this.context = apBinding.getActivity();
        videoView = (VideoView) LayoutInflater.from(context).inflate(R.layout.video_player, null);
        methodChannel = new MethodChannel(fpBinding.getBinaryMessenger(), "my_video_player_" + viewId);
        methodChannel.setMethodCallHandler(this);
    

    @Override
    public void onMethodCall(@NonNull MethodCall call, @NonNull MethodChannel.Result result) 
        Log.e(TAG, "call.method>>" + call.method);
        switch (call.method) 
            case "setUrl":
                String url = call.arguments.toString();
                videoView.initVideoController(context);
                videoView.setUrl(url);
                break;
            case "start":
                videoView.start();
                break;
            case "pause":
                videoView.pause();
                break;
            case "release":
                videoView.pause();
                videoView.release();
                break;
            case "stopFullScreen":
                videoView.stopFullScreen();
                break;
            default:
                result.notImplemented();
        
    

    @Nullable
    @Override
    public View getView() 
        return videoView;
    

    @Override
    public void dispose() 
        Log.e(TAG, "dispose>>");
        videoView.pause();
        videoView.release();
        methodChannel.setMethodCallHandler(null);
        methodChannel = null;
    

其中的VideoView即引用的第三方播放器库，你可以根据自己情况，使用常见的安卓端开源播放器如GSY，饺子，DKPlayer等！

video_player.xml：

<?xml version="1.0" encoding="utf-8"?>
<com.videoplayer.player.VideoView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/videoView"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

在MainActivity中注册插件：

class MainActivity : FlutterActivity() 
    override fun onCreate(savedInstanceState: Bundle?) 
        super.onCreate(savedInstanceState)
        flutterEngine!!.plugins.add(VideoViewPlugin())
    

注意：不要在GeneratedPluginRegistrant中去注册插件包括IOS，这个类由系统自动生成其它第三方插件注册代码！安卓端在MainActivity中注册，IOS端在AppDelegate中注册！

flutter中的引用以及通信方法，上一篇已经写了，本篇就不再重复了！需要注意的是，插件名，插件id，methodChannel等，安卓，IOS和Flutter三端一定要一致！