java - Android - 链接到网站的自定义 ListView

Question

所以我创建了一个自定义 ListView，列表中有 2 个对象。例如，列表中的第一个是猫，第二个是狗。然后，当点击其中一个时，它将导航到不同的 Activity 屏幕。例如，当用户点击“狗”时，它将转到另一个屏幕，其中显示一个新列表，列表中的名称包括“柯基犬”、“哈士奇”、“哈士奇”等。然后，当点击某个狗品种时，它将转发到一个网站。例如，当用户点击“Corgi”时，它会将用户转发到 Corgi 的 Wiki 页面。

我将如何创建应用程序的第三部分？

我的代码如下:

主要 Activity :

    public class MainActivity extends ListActivity implements OnItemClickListener {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        String[] data = { "Dogs", "Cats" };
        int[] icons = { R.drawable.dogz, R.drawable.catz };

        // Provide the cursor for the list view. 
        setListAdapter(new CustomListAdapter(this, data, icons));

        /* setOnItemClickListener() Register a callback to be invoked when an item 
         * in this AdapterView has been clicked.
         */
        getListView().setOnItemClickListener(this);

    }

    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position,
            long id) {
        Intent intent = new Intent(parent.getContext(), ChildActivity.class);

        // Add extended data to the intent.
        intent.putExtra("POSITION", position);

        /*
         * Launch a new activity. You will not receive any information about when 
         * the activity exits. This implementation overrides the base version, 
         * providing information about the activity performing the launch.
         */
        startActivity(intent);
    }

}

子 Activity :

    public class ChildActivity extends ListActivity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        String[][] data = {
                { "Corgi", "Pugs", "Husky" },
                { "Siamese", "Persian", "Maine Coon" } };
        int[][] icons = {
                { R.drawable.d, R.drawable.e, R.drawable.f },
                { R.drawable.a, R.drawable.b, R.drawable.c }, };
        Intent intent = getIntent();
        int position = intent.getIntExtra("POSITION", 0);

        // Provide the cursor for the list view. 
        setListAdapter(new CustomListAdapter(this, data[position],
                icons[position]));

    }

}

自定义列表适配器:

public class CustomListAdapter extends ArrayAdapter<String> {

    private final Context context;
    private final String[] values;
    private final int[] icons;

    public CustomListAdapter(Context context, String[] values, int[] icons) {
        super(context, R.layout.row_layout, values);
        this.context = context;
        this.values = values;
        this.icons = icons;
    }

    @Override
    // Get a View that displays the data at the specified position in the data set.
    public View getView(int position, View convertView, ViewGroup parent) {

        /*
         * Instantiates a layout XML file into its corresponding View objects. 
         * It is never used directly. Instead, use getSystemService(String) to 
         * retrieve a standard LayoutInflater instance that is already hooked up to
         * the current context and correctly configured for the device you are running on.
         */
        LayoutInflater inflater = (LayoutInflater) context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);

        /*
         * Inflate a new view hierarchy from the specified xml resource. 
         * Throws InflateException if there is an error.
         */
        View rowView = inflater.inflate(R.layout.row_layout, parent, false);
        TextView textView = (TextView) rowView.findViewById(R.id.txtStatus);
        textView.setText(values[position]);
        Drawable draw = context.getResources().getDrawable(icons[position]);
        Bitmap bitmap = ((BitmapDrawable) draw).getBitmap();
        int h = bitmap.getHeight();
        int w = bitmap.getWidth();
        Drawable newDraw = new BitmapDrawable(context.getResources(),
                Bitmap.createScaledBitmap(bitmap, 40 * w / h, 40, true));

        /*
         * Sets the Drawables (if any) to appear to the left of, above, to the right of,
         *  and below the text. Use 0 if you do not want a Drawable there. 
         * The Drawables' bounds will be set to their intrinsic bounds.
         */
        textView.setCompoundDrawablesWithIntrinsicBounds(newDraw, null, null,
                null);
        return rowView;
    }
}

我知道我必须创建第三个 Activity ，但我不知道如何在不使用 .xml 的情况下进行它。提前致谢。

Answer 1

1. 尝试使用动物项目制作适配器。
2. OnItemClick() 打开 WebViewFragment并将您的 Animal 对象或 Bundle 中的 Animal.getUrl()-String 传递给它
3. (可选)查看 ExpandableListView以防止不必要的深层导航层次结构。