Question

以下显示错误：

NullPointerException：无法启动活动组件（a.b.YoutubeActivity）

请检查出来。到目前为止，传递单个videoID仍然存在NullPointerException。以下是我的VideoAdapter：

public class VideoAdapter extends BaseAdapter implements YouTubePlayer.OnInitializedListener {

    public static final String API_KEY = "Xxxx-pcD82qk8";
    public static final String VIDEO_ID = "7UpbJKeiv_Y";
    Context context;
    LayoutInflater inflater;
    JSONArray jArray = null;
    ArrayList<YouTubeItem> list;
    private YouTubePlayer youTubePlayer;
    private YouTubePlayerView youTubePlayerView;

    public VideoAdapter(Activity context,
                        JSONArray jArray) {
        // TODO Auto-generated constructor stub

        parseResponse(jArray);
    }

    private void parseResponse(JSONArray jArray) {
        if (jArray != null && jArray.length() > 0) {
            String date;
            String title;
            String link;
            JSONObject jsonObject;
            list = new ArrayList<YouTubeItem>();

            for (int i = 0; i < jArray.length(); i++) {
                try {
                    jsonObject = jArray.getJSONObject(i);
                    date = jsonObject.getString("date");
                    title = jsonObject.getString("title");
                    link = jsonObject.getString("link");

                    if (date != null && title != null && link != null) {
                        list.add(new YouTubeItem(date, title, link));
                    }
                } catch (JSONException e) {
                    e.printStackTrace();
                }

            }

        }
        String[] date = new String[jArray.length()];
        String[] title = new String[jArray.length()];
        String[] link = new String[jArray.length()];

    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub
        Log.i("adapter 1", "");

        View rowView = convertView;
        if (convertView == null) {
            LayoutInflater inflater = (LayoutInflater) context
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            rowView = inflater.inflate(R.layout.youtube_view, parent, false);

        }
        Log.i("adapter 3", "");
        youTubePlayerView = (YouTubePlayerView) rowView
                .findViewById(R.id.youtubeplayerview);
        Log.i("adapter 4", "");
        youTubePlayerView.initialize(API_KEY, this);
        Log.i("adapter 5", "");
        TextView d = (TextView) rowView.findViewById(R.id.textView1);
        Log.i("adapter 6", "");
        TextView t = (TextView) rowView.findViewById(R.id.textView2);
        Log.i("adapter 7", "");
        TextView l = (TextView) rowView.findViewById(R.id.textView3);
        Log.i("adapter 8", "");
        d.setText(list.get(position).getDate());
        Log.i("adapter 9", "");
        t.setText(list.get(position).getTitle());
        Log.i("adapter 10", "");
        l.setText(list.get(position).getLink());
        Log.i("adapter 11", "");

        return rowView;
    }

    @Override
    public int getCount() {
        return list.size();
    }

    @Override
    public Object getItem(int arg0) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public long getItemId(int i) {
        // TODO Auto-generated method stub
        return i;
    }

    private class YouTubeItem {
        private String date;
        private String title;
        private String link;

        private YouTubeItem(String date, String title, String link) {
            this.date = date;
            this.title = title;
            this.link = link;
        }

        public String getDate() {
            return date;
        }

        public void setDate(String date) {
            this.date = date;
        }

        public String getTitle() {
            return title;
        }

        public void setTitle(String title) {
            this.title = title;
        }

        public String getLink() {
            return link;
        }

        public void setLink(String link) {
            this.link = link;
        }
    }

    @Override
    public void onInitializationFailure(Provider arg0,
                                        YouTubeInitializationResult arg1) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onInitializationSuccess(Provider provider, 
                                        YouTubePlayer player, boolean wasRestored) {
        // TODO Auto-generated method stub
        youTubePlayer = player;

        if (!wasRestored) {
            player.cueVideo(VIDEO_ID);
        }
    }
}

Answer 1

用这个替换你Adapter

public class VideoAdapter extends BaseAdapter {

Context context;
LayoutInflater inflater;
JSONArray jArray = null;
ArrayList<YouTubeItem> list;

public VideoAdapter(YoutubeActivity youtubeActivity,
                    int activityYouTubeApi, JSONArray jArray) {
    // TODO Auto-generated constructor stub

    parseResponse(jArray);
}

private void parseResponse(JSONArray jArray) {
    if (jArray != null && jArray.length() > 0) {
        String date;
        String title;
        String link;
        JSONObject jsonObject;
        list = new ArrayList<>();

        for (int i = 0; i < jArray.length(); i++) {
            try {
                jsonObject = jArray.getJSONObject(i);
                date = jsonObject.getString("date");
                title = jsonObject.getString("title");
                link = jsonObject.getString("link");

                if (date != null && title != null && link != null) {
                    list.add(new YouTubeItem(date, title, link));
                }
            } catch (JSONException e) {
                e.printStackTrace();
            }

        }

    }
    String[] date = new String[jArray.length()];
    String[] title = new String[jArray.length()];
    String[] link = new String[jArray.length()];


}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    // TODO Auto-generated method stub

    LayoutInflater inflater = (LayoutInflater) context
            .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    View rowView = inflater.inflate(R.layout.youtube_view, parent, false);
    YouTubePlayerView you = (YouTubePlayerView) rowView.findViewById(R.id.youtubeplayerview);
    TextView d = (TextView) rowView.findViewById(R.id.textView1);
    TextView t = (TextView) rowView.findViewById(R.id.textView2);
    TextView l = (TextView) rowView.findViewById(R.id.textView3);

    d.setText(list.get(position).getDate());
    t.setText(list.get(position).getTitle());
    l.setText(list.get(position).getLink());

    return rowView;
}

@Override
public int getCount() {
    return list.size();
}

@Override
public Object getItem(int arg0) {
    // TODO Auto-generated method stub
    return null;
}

@Override
public long getItemId(int i) {
    // TODO Auto-generated method stub
    return i;
}

private class YouTubeItem {
    private String date;
    private String title;
    private String link;

    private YouTubeItem(String date, String title, String link) {
        this.date = date;
        this.title = title;
        this.link = link;
    }

    public String getDate() {
        return date;
    }

    public void setDate(String date) {
        this.date = date;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getLink() {
        return link;
    }

    public void setLink(String link) {
        this.link = link;
    }
}
}

我创建了一个名为YouTubeItem的对象，而不是创建三个不同的数组。这将更易读，更容易操作，如果丢失了三个数组中任何一个数据的一个属性，并且解析单个进程（无效对象不会影响整个过程），则可以避免任何问题。

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如何在Android中的ListView中显示YouTubePlayerView？

1 个答案: