Android 如何从方法中获取数据并将其放入ListView？

我有这门课：

public class Bookmark extends ArrayList<Bkm> {

    public static Bookmark getBookmark(Context context) {
        Bookmark bookmarks = new Bookmark ();

        String[] titles  = context.getResources().getStringArray(R.array.bookmark_titles);
        String[] urls    = context.getResources().getStringArray(R.array.bookmark_urls);
        TypedArray icons = context.getResources().obtainTypedArray(R.array.bookmark_icons);

        for (int i = 0; i < titles.length; i ++) {
            bookmarks.add(titles[i], urls[i], icons.getDrawable(i));
        }

        return bookmarks;
    }
}

我正试图通过这种方式获取数据

Context context = getApplicationContext();        
ArrayList<Bookmark> my_array = BookmarkCollection.getTestBookmarks(context);
ArrayAdapter<Bookmark> aa = new ArrayAdapter<Bookmark>(context, R.array.bookmark_titles, android.R.layout.simple_list_item_1, my_array);
ListView lv = (ListView) findViewById(R.id.favoritos_listView);
lv.setAdapter(aa);

Context-Context=getApplicationContext（）；
ArrayList my_array=BookmarkCollection.getTestBookmarks（上下文）；
ArrayAdapter aa=新的ArrayAdapter（上下文，R.array.bookmark\u标题，android.R.layout.simple\u列表\u项目\u 1，我的\u数组）；
ListView lv=（ListView）findViewById（R.id.favoritos\u ListView）；
低压设置适配器（aa）；

---

但是列表视图不会出现。

Boomark

不需要扩展

ArrayList

。您需要做的是为书签对象创建一个自定义适配器，并在ListView上使用该适配器

首先创建书签模型类

public class Bookmark {

    private String title;
    private String url;
    private Drawable icon;

    public Bookmark(String title, String url, Drawable icon) {

        this.title = title;
        this.url = url;
        this.icon = icon;
    }

    public String getTitle() {
        return title;
    }

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

    public String getUrl() {
        return url;
    }

    public void setUrl(String url) {
        this.url = url;
    }

    public Drawable getIcon() {
        return icon;
    }

    public void setIcon(Drawable icon) {
        this.icon = icon;
    }
}

然后创建书签适配器

public class BookmarkAdapter extends BaseAdapter{

    private ArrayList<Bookmark> bookmarks;
    private Context context;

    public BookmarkAdapter(Context context, ArrayList<Bookmark> bookmarks) {

        this.context = context;
        this.bookmarks = bookmarks;
    }

    public int getCount() {

        return bookmarks.size();
    }

    public Object getItem(int position) {

        return bookmarks.get(position);
    }

    public long getItemId(int arg0) {

        return 0;
    }

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

         View row = convertView;
           if ( row == null ) {

               row = View.inflate( context, R.layout.row_bookmark, null );
           }

           Bookmark bookmark = (Bookmark)getItem(position);

           if (  bookmark!= null ) {

               TextView name = (TextView) row.findViewById( R.id.title );

               if ( name != null ) {

                   name.setText( bookmark.getTitle() );
               }
           }

           return row;
    }
}

将其放入您的

活动

xml中

<ListView
    android:id="@+id/bookmark_list"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" >
</ListView>

在活动中填充列表

   String[] titles  = getResources().getStringArray(R.array.bookmark_titles);
   String[] urls    = getResources().getStringArray(R.array.bookmark_urls);
   TypedArray icons = getResources().obtainTypedArray(R.array.bookmark_icons);

   ArrayList<Bookmark> bookmarks = new ArrayList<Bookmark>();

   for (int i = 0; i < titles.length; i ++) {

       bookmarks.add(new Bookmark(titles[i], urls[i], icons.getDrawable(i)));
   }

   ListView bookmarkList = (ListView)findViewById(R.id.bookmark_list);
   bookmarkList.setAdapter(new BookmarkAdapter(this, bookmarks));

String[]titles=getResources（）.getStringArray（R.array.bookmark\u titles）；
字符串[]URL=getResources（）.getStringArray（R.array.bookmark\u URL）；
TypedArray icons=getResources（）.obtainTypedArray（R.array.bookmark_icons）；
ArrayList bookmarks=新建ArrayList（）；
对于（int i=0；i

要在选择列表项时获取URL，需要设置该项，然后单击listener

bookmarkList.setOnItemClickListener(new OnItemClickListener() {

        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

            String url = ((Bookmark)parent.getAdapter().getItem(position)).getUrl();
        }
    });

bookmarkList.setOnItemClickListener（新的OnItemClickListener（）{
public void onItemClick（AdapterView父对象、视图、整型位置、长id）{
字符串url=（（书签）parent.getAdapter（）.getItem（position））.getUrl（）；
}
});

Boomark

不需要扩展

ArrayList

。您需要做的是为书签对象创建一个自定义适配器，并在ListView上使用该适配器

首先创建书签模型类

public class Bookmark {

    private String title;
    private String url;
    private Drawable icon;

    public Bookmark(String title, String url, Drawable icon) {

        this.title = title;
        this.url = url;
        this.icon = icon;
    }

    public String getTitle() {
        return title;
    }

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

    public String getUrl() {
        return url;
    }

    public void setUrl(String url) {
        this.url = url;
    }

    public Drawable getIcon() {
        return icon;
    }

    public void setIcon(Drawable icon) {
        this.icon = icon;
    }
}

然后创建书签适配器

public class BookmarkAdapter extends BaseAdapter{

    private ArrayList<Bookmark> bookmarks;
    private Context context;

    public BookmarkAdapter(Context context, ArrayList<Bookmark> bookmarks) {

        this.context = context;
        this.bookmarks = bookmarks;
    }

    public int getCount() {

        return bookmarks.size();
    }

    public Object getItem(int position) {

        return bookmarks.get(position);
    }

    public long getItemId(int arg0) {

        return 0;
    }

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

         View row = convertView;
           if ( row == null ) {

               row = View.inflate( context, R.layout.row_bookmark, null );
           }

           Bookmark bookmark = (Bookmark)getItem(position);

           if (  bookmark!= null ) {

               TextView name = (TextView) row.findViewById( R.id.title );

               if ( name != null ) {

                   name.setText( bookmark.getTitle() );
               }
           }

           return row;
    }
}

将其放入您的

活动

xml中

<ListView
    android:id="@+id/bookmark_list"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" >
</ListView>

在活动中填充列表

   String[] titles  = getResources().getStringArray(R.array.bookmark_titles);
   String[] urls    = getResources().getStringArray(R.array.bookmark_urls);
   TypedArray icons = getResources().obtainTypedArray(R.array.bookmark_icons);

   ArrayList<Bookmark> bookmarks = new ArrayList<Bookmark>();

   for (int i = 0; i < titles.length; i ++) {

       bookmarks.add(new Bookmark(titles[i], urls[i], icons.getDrawable(i)));
   }

   ListView bookmarkList = (ListView)findViewById(R.id.bookmark_list);
   bookmarkList.setAdapter(new BookmarkAdapter(this, bookmarks));

String[]titles=getResources（）.getStringArray（R.array.bookmark\u titles）；
字符串[]URL=getResources（）.getStringArray（R.array.bookmark\u URL）；
TypedArray icons=getResources（）.obtainTypedArray（R.array.bookmark_icons）；
ArrayList bookmarks=新建ArrayList（）；
对于（int i=0；i

要在选择列表项时获取URL，需要设置该项，然后单击listener

bookmarkList.setOnItemClickListener(new OnItemClickListener() {

        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

            String url = ((Bookmark)parent.getAdapter().getItem(position)).getUrl();
        }
    });

bookmarkList.setOnItemClickListener（新的OnItemClickListener（）{
public void onItemClick（AdapterView父对象、视图、整型位置、长id）{
字符串url=（（书签）parent.getAdapter（）.getItem（position））.getUrl（）；
}
});

感谢您的精彩回答。我已经有书签课了。还有一个问题。我已经有了getBookmark（）方法，它已经执行了填充活动中列表的操作。我怎么能在我的主类中简单地调用这个方法呢？你可以使用

bookmarkList.setAdapter（新的bookmarkapter（this，Bookmark.getBookmark（this））；

谢谢你的回答。我已经有了Bookmark类。还有一个问题。我已经有了getBookmark（）方法，该方法已执行填充活动中列表的操作。我如何在主类中调用此方法？您可以使用

bookmarkList.setAdapter（新bookmarkapter（this，Bookmark.getBookmark（this））；