如何在 Butterknife onclick 函数中访问 YouTubePlayerView

Question

使用此方法会引发空对象引用。 Butterknife 不允许在 void go(){ 函数内部查看任何引用。有没有办法在函数内部访问此视图 YouTubePlayerView youTubePlayerView = player_view;？

.java

 @BindView(R.id.youtube_player_view) YouTubePlayerView player_view;

   YouTubePlayerView youTubePlayerView =  player_view;
    //start view trailer
    @OnClick(R.id.iv_play_circle)
    void go(){

       String vid = video.getVideoKey(); 

       if(vid != null){

           youTubePlayerView.addYouTubePlayerListener(new AbstractYouTubePlayerListener() {
               @Override
               public void onReady(@NonNull YouTubePlayer youTubePlayer) {
                   youTubePlayer.loadVideo(vid, 0);
               }
           });

        }
    }//end view trailer


    @Override
    public void onDestroyView () {

        if(youTubePlayerView != null) {
            youTubePlayerView.release();
        }
        super.onDestroyView ();
  
    }

错误日志

E/CustomActivityOnCrash: The previous app process crashed. This is the stack trace of the crash:
    java.lang.NullPointerException: Attempt to invoke virtual method 'boolean com.pierfrancescosoffritti.androidyoutubeplayer.core.player.views.YouTubePlayerView.addYouTubePlayerListener(com.pierfrancescosoffritti.androidyoutubeplayer.core.player.listeners.YouTubePlayerListener)' on a null object reference

Answer 1

@BindView(R.id.youtube_player_view) YouTubePlayerView player_view;
YouTubePlayerView youTubePlayerView =  player_view;

此处您期望 youTubePlayerView 的值与 player_view 视图变量的 'filled' 值相同，但实际上，此分配是在player_view 绑定到视图之前的时间。

那是因为@BindView是在你的onCreate()上调用了ButterKnife.bind(this)之后生效的，而你的赋值是在class初始化时完成的。

要么直接使用 player_view，要么在调用 ButterKnife.bind(this) 之后执行 youTubePlayerView = player_view;。

如何在 Butterknife onclick 函数中访问 YouTubePlayerView

How to access YouTubePlayerView inside Butterknife onlick function

java

android

butterknife