我应该在这里传递什么参数

Question

我正在与exoplayer合作，现在我正在尝试下载audio.i已经完成了创建下载管理器的工作，现在我在传递参数时遇到错误，请参见图片...

这里是代码

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_exoplayer);

        thumb = findViewById(R.id.thumb);
        head = findViewById(R.id.head);

        String image = getIntent().getStringExtra("image");
         url = getIntent().getStringExtra("url");
        String title = getIntent().getStringExtra("title");


        head.setText(title);
        Glide.with(this).asBitmap().load(image).into(thumb);

        //download
        head.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                ProgressiveDownloadAction progressiveDownloadAction = new ProgressiveDownloadAction(url,false,null, null);//here where i am getting error

                DownloadService.startWithAction(exoplayer.this, AudioDownloadService.class, null,false);
            }
        });


        initializeplayer();
    }

    public void initializeplayer(){

        playerView = findViewById(R.id.exo);
        simpleExoPlayer = ExoPlayerFactory.newSimpleInstance(this);
        playerView.setPlayer(simpleExoPlayer);

        DataSource.Factory datasourcefactory = new DefaultDataSourceFactory(this,
                Util.getUserAgent(this, "appname"));

       CacheDataSourceFactory cacheDataSourceFactory =  new CacheDataSourceFactory(DownloadUtil.getCache(this),datasourcefactory);

        ConcatenatingMediaSource concatenatingMediaSource = new ConcatenatingMediaSource();//

        MediaSource mediaSource = new ExtractorMediaSource.Factory(cacheDataSourceFactory)//it was datasourcefactory
                .createMediaSource(Uri.parse(url));

        concatenatingMediaSource.addMediaSource(mediaSource);//

        simpleExoPlayer.prepare(mediaSource);
        simpleExoPlayer.setPlayWhenReady(true);

    }

现在那里需要什么参数。如果有人可以，请帮助我。

编辑：通过Uri.parse（url）后收到此错误...

java.lang.NullPointerException：尝试在空对象引用上调用虚拟方法'byte [] com.google.android.exoplayer2.offline.DownloadAction.toByteArray（）'在com.google.android.exoplayer2.offline.DownloadService.buildAddActionIntent（DownloadService.java:173）在com.google.android.exoplayer2.offline.DownloadService.startWithAction（DownloadService.java:190）在com.example.project.exoplayer $ 1.onClick（exoplayer.java:60）在android.view.View.performClick（View.java:6294）在android.view.View $ PerformClick.run（View.java:24770）在android.os.Handler.handleCallback（Handler.java:790）在android.os.Handler.dispatchMessage（Handler.java:99）在android.os.Looper.loop（Looper.java:164）在android.app.ActivityThread.main（ActivityThread.java:6499）在java.lang.reflect.Method.invoke（本机方法）在com.android.internal.os.RuntimeInit $ MethodAndArgsCaller.run（RuntimeInit.java:442）在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:807）

Answer 1

在您的ProgressiveDownloadAction构造函数中，使用Uri.parse(url)代替url