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我有一个带有lazyadapter的自定义列表视图。我正在尝试使列表视图上的文本视图的可点击部分打开一个新活动。但我被困住了。

这是在 LazyAdapter 中（我想说这不是一个 Activity。它只是 LazyAdapter 类）：

private Activity activity;
private String[] urls;
private String[] tweets;
private String[] names;
private static LayoutInflater inflater = null;
public ImageLoader imageLoader;

public LazyAdapter(Activity a, String[] u, String[] n, String[] t) {
    activity = a;
    urls = u;
    names = n;
    tweets = t;
    inflater = (LayoutInflater) activity
            .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    imageLoader = new ImageLoader(activity.getApplicationContext());
}

public int getCount() {
    return urls.length;
}

public Object getItem(int position) {
    return position;
}

public long getItemId(int position) {
    return position;
}

public View getView(int position, View convertView, ViewGroup parent) {
    View vi = convertView;
    if (convertView == null)
        vi = inflater.inflate(R.layout.list_item, null);

    TextView user = (TextView) vi.findViewById(R.id.textUser);
    TextView tweet = (TextView) vi.findViewById(R.id.textTweet);
    ImageView image = (ImageView) vi.findViewById(R.id.imageView);
    user.setText(names[position]);

    String[] checkHashtag= tweets[position].split(" ");


    SpannableStringBuilder sb = new SpannableStringBuilder();


    for(final String item: checkHashtag){
        if(item.substring(0,1).matches("#")){
            sb.append(item+" ");

            sb.setSpan(new ClickableSpan() {
                @Override
                public void onClick(View view) {

                    Intent intent = new Intent(null, TweetActivity.class);
                    intent.putExtra("item", item);
                    Intent.startActivity(intent);

                }
            }, sb.length()-item.length(), sb.length(),Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
        } else sb.append(item+" ");

    }
    tweet.setText(sb);






    if (tweets[position].toLowerCase().contains("http://")
            || tweets[position].toLowerCase().contains("https://")) {

        String[] parts = tweets[position].split(" ");
        for (String item : parts) {
            URL url;
            try {
                url = new URL(item);
                Pattern pattern = Pattern.compile(url.toString());
                Linkify.addLinks(tweet, pattern, "http://");
            } catch (MalformedURLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

        }
    }




    imageLoader.DisplayImage(urls[position], image);
    return vi;
}

}

这就是我在 Tweet Activity 中调用 LazyAdapter 的方式：

    LazyAdapter adapter = new LazyAdapter(this, pic_urls, user_names, tweets);
    setListAdapter(adapter);

但它不起作用。startActivity(intent) 部分存在一些问题。

4

2 回答 2

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写而a.this不是null

Intnet intent = new Intent(null, TweetActivity.class);
于 2013-08-20T07:17:36.333 回答
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Intent 意图 = new Intent(null, TweetActivity.class);

这里替换null为a

您必须在开始另一个活动时提供活动参考。

于 2013-06-11T12:54:56.187 回答