Question

标题听起来有点令人困惑，但我正在从网站解析信息并将其存储在arraylist<string>中。在我ArrayList<String> mPictures = new GetTeachers().execute("div.post_thumb_clean img", "src").get();存储我正在使用的asynctask的结果后，我会使用ArrayList<Teacher> = mTeachers和mTeachers.add(new Teacher(Splash.mNames, Splash.mEmails, Splash.mPictures));在我的TeacherAdapter中实施。问题是每当我运行所有这些时，只有一个listitem显示而不是11个左右。我认为问题发生在我用作listitem的Teacher.class中。好吧，我不知道怎么说这一切，因为我自己学习，我不确定我的术语是否合适，但是我将在下面的每个文件中发布摘录。谢谢！另外，对于代码的大量抱歉，请随时编辑它。

AsyncTask（GetTeachers.class）

public class GetTeachers extends AsyncTask<String, Void, ArrayList<String>> {

    public static ArrayList<Teacher> mTeachers;
    protected final ArrayList<String> mInfo = new ArrayList<String>();

    @Override
    protected ArrayList<String> doInBackground(String... param) {
        try {
            Document doc = Jsoup.connect("http://www.androidpolice.com/")
                    .timeout(10000).userAgent("Mozilla").get();
            Elements elements = doc.select(param[0]);
            for (Element element : elements) {
                mInfo.add(element.absUrl(param[1]));
            }

        } catch (Exception ex) {
            ex.printStackTrace();
        }

        return mInfo;
    }

    @Override
    protected void onPostExecute(ArrayList<String> result) {
        super.onPostExecute(result);
        mTeachers = new ArrayList<Teacher>();
        mTeachers.add(new Teacher(Splash.mNames, Splash.mEmails,
                Splash.mPictures));
    }

}

Teacher.class

public class Teacher {
    String mName, mEmail, mPicture;

    public Teacher() {

    }

    public Teacher(ArrayList<String> n, ArrayList<String> e, ArrayList<String> p) {

        StringBuilder sbn = new StringBuilder();
        for (String mN : n) {
            sbn.append(mN);
            mName = mN;
        }
        StringBuilder sbe = new StringBuilder();
        for (String mE : e) {
            sbe.append(mE);
            mEmail = mE;
        }
        StringBuilder sbp = new StringBuilder();
        for (String mP : p) {
            sbp.append(mP);
            mPicture = mP;
        }
    }

    public String getName() {
        return mName;
    }

    public void setName(String name) {
        mName = name;
    }

    public String getEmail() {
        return mEmail;
    }

    public void setEmail(String email) {
        mEmail = email;
    }

    public String getPicture() {
        return mPicture;
    }

    public void setPicture(String picture) {
        mPicture = picture;
    }

}

TeacherAdapter.class：

public class TeacherAdapter extends ArrayAdapter<Teacher> {

    Typeface thin;
    private LayoutInflater mInflater;
    private ArrayList<Teacher> mTeacher;
    private int mViewResourceId;

    public TeacherAdapter(Context ctx, int viewResourceId,
            ArrayList<Teacher> teacher) {
        super(ctx, viewResourceId, teacher);

        mInflater = (LayoutInflater) ctx
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);

        thin = Typeface.createFromAsset(ctx.getAssets(), "RobotoThin.ttf");
        mViewResourceId = viewResourceId;

        mTeacher = teacher;
    }

    @Override
    public long getItemId(int position) {
        return 0;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        convertView = mInflater.inflate(mViewResourceId, null);
        Teacher teacher = mTeacher.get(position);
        TextView teachername = (TextView) convertView
                .findViewById(R.id.teacher_name);
        TextView teacheremail = (TextView) convertView
                .findViewById(R.id.teacher_email);
        ImageView iv = (ImageView) convertView
                .findViewById(R.id.teacher_picture);

        teachername.setTypeface(thin);
        teacheremail.setTypeface(thin);
        AQuery aq = new AQuery(getContext());
        AQUtility.setDebug(false);

        teachername.setText(teacher.getName());
        teacheremail.setText(teacher.getEmail());
        aq.id(iv).image(teacher.getPicture(), false, true, 64, R.drawable.ic_contact_picture);

        return convertView;
    }
}

除了Splash.class

    public static ArrayList<String> mNames, mEmails, mPictures = new ArrayList<String>();
        ...
        mPictures = new ArrayList<String>();
        mNames = new GetTeachers().execute("h3 a", "href").get();
        mEmails = new GetTeachers().execute("h3 a", "href").get();
        mPictures = new GetTeachers().execute("div.post_thumb_clean img",
                "src").get();

Answer 1

问题在于AsyncTask的onPostExecute()方法。

mTeachers = new ArrayList<Teacher>();
mTeachers.add(new Teacher(Splash.mNames, Splash.mEmails,
            Splash.mPictures));

在这里，您初始化mTeachers列表，但只添加一个Teacher对象。我不确定Splash.mNames，Splash.mEmails和Splash.mPictures是什么。

现在，在适配器的getView()方法中，Teacher teacher = mTeacher.get(position);适用于位置zero。由于mTeachers的尺寸为one，因此列表视图中只会显示一个项目。

修改1：

让我们对您的适配器进行一些更改。添加以上Typeface thin;：

private ArrayList<String> mNames;
private ArrayList<String> mEmails;
private ArrayList<String> mPictures;

接下来，从以下位置更改构造函数：

public TeacherAdapter(Context ctx, int viewResourceId,
        ArrayList<Teacher> teacher)

为：

public TeacherAdapter(Context ctx, int viewResourceId,
        ArrayList<String> names, ArrayList<String> emails, ArrayList<String> pictures)

这将进入你的构造函数：

    super();

    mInflater = (LayoutInflater) ctx
            .getSystemService(Context.LAYOUT_INFLATER_SERVICE);

    thin = Typeface.createFromAsset(ctx.getAssets(), "RobotoThin.ttf");
    mViewResourceId = viewResourceId;

    mNames = names;
    mEmails = emails;
    mPictures = pictures;

您的getView()将拥有以下内容：

    convertView = mInflater.inflate(mViewResourceId, null);

    TextView teachername = (TextView) convertView
            .findViewById(R.id.teacher_name);
    TextView teacheremail = (TextView) convertView
            .findViewById(R.id.teacher_email);
    ImageView iv = (ImageView) convertView
            .findViewById(R.id.teacher_picture);

    teachername.setTypeface(thin);
    teacheremail.setTypeface(thin);
    AQuery aq = new AQuery(getContext());
    AQUtility.setDebug(false);

    teachername.setText(mNames.get(position));
    teacheremail.setText(mEmails.get(position));
    aq.id(iv).image(mPictures.get(position), false, true, 64, R.drawable.ic_contact_picture);

    return convertView;

从onPostExecute()方法中删除这些行：

    mTeachers = new ArrayList<Teacher>();
    mTeachers.add(new Teacher(Splash.mNames, Splash.mEmails,
            Splash.mPictures));

目的是为TeacherAdapter提供3个ArrayList来代替ArrayList。设置适配器并更新它（adapter.notifyDataSetChanged（））。

无法从jsoup将自定义列表实现到自定义数组适配器中

1 个答案: