标签: custom-adapter

我正在尝试Gallery使用一个小部件HorizontalScrollView,所以在HorizontalScrollView我添加ImageView的内部,问题是我将添加600多个图像!
我是否可以制作某种自定义适配器以覆盖该GetView方法并使用convertView以使应用更流畅并避免同时添加600多个视图？

我想获得一个列表标题,当我在主页上键入Edittext然后在单击"确定"按钮后添加到列表中时,我想要的是什么.现在我不知道从主页Activity上的customAdapter类调用我的刷新方法的位置.

请查看我的HomePage活动:

public class Main_Activity extends Activity implements OnClickListener {
Button ok;
EditText addTasklist;
ListView list_tasklistname;
TodoTask_Database db;
CustomAdapter cAdapter;
List<Tasks> list = new ArrayList<Tasks>();
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main_layout);
    ok = (Button)findViewById(R.id.add);
    ok.setOnClickListener(this);
    list_tasklistname = (ListView)findViewById(R.id.listview);
    db = new TodoTask_Database(getApplicationContext());
    list = db.getAllTaskList();
    CustomAdapter adapter = new CustomAdapter(Main_Activity.this, R.layout.tasklist_row, list);
    list_tasklistname.setAdapter(adapter);
    /*list_tasklistname.setOnItemClickListener(new OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> adapterView, View v, int position,
                long id) {
        }
    });*/
    db.close();
}
}
@Override
public void onClick(View v) …

使用Chris Banes的PullToRefresh库,我的自定义适配器的getView()方法没有被调用.这段代码工作正常,不使用他的库,并调用getView().我一直在调查这几天,无法弄清楚出了什么问题.任何反馈将不胜感激!

MyActivity.java

MyAdapter adapter = new MyAdapter(this, data);
// the following toast displays the correct count
Toast.makeText("MyActivity", adapter.getCount(), Toast.LENGTH_SHORT).show(); 
myListView.setAdapter(adapter);

MyAdapter.java

public class MyAdapter extends ArrayAdapter<Object> {

    private ArrayList<Object> data;
    private LayoutInflater vi;
    private Context context;

    public MyAdapter(Context context, ArrayList<Object> data) {
        super(context, 0);
        this.context = context;
        this.data = data;
        this.vi = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }

    static class ViewHolder {
        ...
    }

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

    @Override
    public long getItemId(int position) {
        return …

这适用于onCreate的活动

String htmlstring="<p><em><strong>hello world</strong></em></p>";

    tv.setText(Html.fromHtml(html));

但是当我在listview中使用相同的服务器时,它无法正常工作

ViewHolder holder = new ViewHolder();

            holder.quest = (TextView) vi.findViewById(R.id.question_data);

            holder.quest.setText(Html.fromHtml(htmlstring));

怎么了!我怎么能实现这个目标？

我不会有什么问题。没有任何错误，程序运行完美。但是，当我单击列表视图中的一个项目时，它不会执行任何操作。换句话说，“吐司”不会通过

这是我的主要课程：

public class ViewListAct extends ActionBarActivity {


private ListView list;
private final String[] names_1 = {"McDonald's", "Subway", "Pizza Hut", "Burger King"};
private final String[] img_1   = {"mcd", "mcd", "mcd", "mcd"};
private Activity context;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.view_list);
    list = (ListView) findViewById(R.id.listview);

    AdapterView adapter = new AdapterView(this, img_1, names_1);
    list.setAdapter(adapter);


      list.setOnItemClickListener(new android.widget.AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(android.widget.AdapterView<?> parent, View view, int position, long id) {
           Toast.makeText(getApplicationContext(), names_1[position], Toast.LENGTH_LONG).show();


        }
    });

}

这是我的自定义适配器类：

public class AdapterView extends …

我为listview创建了一个customadapter,但由于某种原因,getView方法的参数"position"始终为0,这使得该方法毫无用处.

这是我的customAdapter的代码,扩展了BaseAdapter:

public class CreateProgramAdapter extends BaseAdapter {

    private LayoutInflater inflater;
    private ArrayList<TrainingPass> trainingPasses;
    private List<TrainingPass> items;
    private Context context;

    public CreateProgramAdapter(Context context, List<TrainingPass> items) {
        this.context = context;
        this.items = items;
        this.inflater = LayoutInflater.from(this.context);
    }

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

    @Override
    public TrainingPass getItem(int position) {
        return items.get(position);
    }

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

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View view;
        TrainingPassHolder holder;

        if(convertView == null) { …

我在微调框中有7个项目.我创建了带有textview和复选框的微调框.我想做以下逻辑.

能否请你给我任何建议:

private static final String[] select_qualification = {
        "Select Qualification", "10th / Below", "12th", "Diploma", "UG",
        "PG", "Phd" };

如果我将检查UG复选框,它会自动选中状态的复选框10th/Below,12th,Diploma还取消复选框的选中状态PG和phd.

如果选中任何复选框,则表示上一项复选框自动需要选中状态,下一项复选框自动需要取消选中状态.

现在这是我的适配器文件:

public class CustomAdapter extends ArrayAdapter<String> {

    public CustomAdapter(Context context, int resourceId, String[] objects) {
        super(context, resourceId, objects);
        // TODO Auto-generated constructor stub
    }

    @Override
    public View getDropDownView(int position, View convertView,
            ViewGroup parent) {
        return getCustomView(position, convertView, parent);
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) …

请原谅我的英语。

我的清单包含 100 项。每个项目由两个复选框组成，每次单击复选框时我都想滚动到下一个项目。

请给我最佳答案链接 如果这个问题已经被回答

这是我的自定义适配器

 public class CustomAdapter extends 
       RecyclerView.Adapter<CustomAdapter.MyViewHolder> {

private ArrayList answerFirst;
private ArrayList answerSecond;
private Context context;

public CustomAdapter(Context  context, ArrayList questionList, ArrayList 
answerFirst, ArrayList answerSecond) {
    this.context = context;
    this.answerFirst = answerFirst;
    this.answerSecond = answerSecond;
}

@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View v = 
    LayoutInflater.from(parent.getContext()).inflate(R.layout.test_items, 
    parent, false);
    return new MyViewHolder(v);
}

@Override
public void onBindViewHolder(final MyViewHolder holder, final int position) 
    {

        holder.firstanswer.setText(answerFirst.get(position).toString());
        holder.secondanswer.setText(answerSecond.get(position).toString());
    }

@Override
public int getItemCount() {
    return questionList.size(); …

我正在尝试创建一个自定义列表适配器,其中包含需要从Internet下载的每个项目的图像.当我第一次进入活动时 - 应用程序冻结一段时间,直到下载图像,然后加载活动列表.

我可以看出,在活动加载之前正在下载图像.如何在活动加载后下载图像.我想我需要使用Async Task.但由于我在自定义阵列适配器中加载图像,因此不确定如何操作.

这是我的自定义适配器getView():

public View getView(int position, View convertView, ViewGroup parent) {
        View v = convertView;

        if (v == null) {
            LayoutInflater vi;
            vi = LayoutInflater.from(getContext());
            v = vi.inflate(R.layout.list_item_default, null);
        }

        Item p = items.get(position);

        if (p != null) {

            TextView list_title = (TextView) v.findViewById(R.id.list_title);
            TextView list_description = (TextView) v
                    .findViewById(R.id.list_description);
            TextView list_timestamp = (TextView) v
                    .findViewById(R.id.list_timestamp);
            ImageView list_image = (ImageView) v.findViewById(R.id.list_image);

            if (list_title != null) {
                list_title.setText(p.getItemTitle());
            }

            if (list_description != null) {
                list_description.setText(p.getItemDescription()); …

我对android有点新,我正试图弄清楚这些自定义列表适配器.所以我有一个扩展BaseListActivity的活动和一个类似的函数:

public void inflate(){

    ArrayList<String> words = new ArrayList<String>();
    orders.add("hello");
    orders.add("world");

    wordsList = (ListView) findViewById(R.id.list);

    WordsAdapter adapter = new WordsAdapter(this, R.layout.single_word_container_item,words);
    wordsList.setAdapter(adapter);

然后我按如下方式实现我的自定义WordsAdapter:

public class WordsAdapter extends ArrayAdapter<String>{
    public Context context;
    public ArrayList<String> _words;

    //not sure the purpose of 'a' here
    public WordsAdapter(Context context, int a, ArrayList<String> words) {
        super(context, a, words);
        _words = words;
        this.context = context;
    }


    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View v = inflater.inflate(R.layout.single_word_container_item, null);
        TextView …