Android，使用SimpleCursorAdapter设置颜色而不仅仅是字符串

发布于 2024-10-31 00:53:43 字数 391 浏览 5 评论 0原文

我在应用程序的列表上设置了一个简单的光标适配器，如下所示：

private static final String fields[] = {"GenreLabel", "Colour", BaseColumns._ID};


datasource = new SimpleCursorAdapter(this, R.layout.row, data, fields, new int[]{R.id.genreBox, R.id.colourBox});

R.layout.row 由两个 TextView（genreBox 和 colorBox）组成。我不想将 TextView 的内容设置为 "Colour" 的值，而是想将其背景颜色设置为该值。

我需要做什么才能实现这一目标？

原文

I have a simple cursor adapter set on a list in my application as follows:

private static final String fields[] = {"GenreLabel", "Colour", BaseColumns._ID};


datasource = new SimpleCursorAdapter(this, R.layout.row, data, fields, new int[]{R.id.genreBox, R.id.colourBox});

R.layout.row consists of two TextViews (genreBox and colourBox). Rather than setting the content of the TextView to the value of "Colour" , I would like to set its background colour to that value.

What would I need to do to achieve this?

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自在安然 2024-11-07 00:53:43

查看 SimpleCursorAdapter.ViewBinder。

setViewValue< /a> 基本上是您对光标中的数据执行任何操作的机会，包括设置视图的背景颜色。

例如，类似：

SimpleCursorAdapter.ViewBinder binder = new SimpleCursorAdapter.ViewBinder() {
    @Override
    public boolean setViewValue(View view, Cursor cursor, int columnIndex) {
        String name = cursor.getColumnName(columnIndex);
        if ("Colour".equals(name)) {
            int color = cursor.getInt(columnIndex);
            view.setBackgroundColor(color);
            return true;
        }
        return false;
    }
}
datasource.setViewBinder(binder);

更新 - 如果您使用自定义适配器（扩展CursorAdaptor），那么代码不会发生太大变化。您将覆盖 getView 和 bindView：

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    if (convertView != null) {
        return convertView;
    }
    /* context is the outer activity or a context saved in the constructor */
    return LayoutInflater.from(context).inflate(R.id.my_row);
}

@Override
public void bindView(View view, Context context, Cursor cursor) {
    int color = cursor.getInt(cursor.getColumnIndex("Colour"));
    view.setBackgroundColor(color);
    String label = cursor.getString(cursor.getColumnIndex("GenreLabel"));
    TextView text = (TextView) findViewById(R.id.genre_label);
    text.setText(label);
}

您需要更多手动操作，但或多或少是相同的想法。请注意，在所有这些示例中，您可以通过缓存列索引而不是通过字符串查找它们来节省性能。

Check out SimpleCursorAdapter.ViewBinder.

setViewValue is basically your chance to do whatever you wish with the data in your Cursor, including setting the background color of your views.

For example, something like:

SimpleCursorAdapter.ViewBinder binder = new SimpleCursorAdapter.ViewBinder() {
    @Override
    public boolean setViewValue(View view, Cursor cursor, int columnIndex) {
        String name = cursor.getColumnName(columnIndex);
        if ("Colour".equals(name)) {
            int color = cursor.getInt(columnIndex);
            view.setBackgroundColor(color);
            return true;
        }
        return false;
    }
}
datasource.setViewBinder(binder);

Update - if you're using a custom adapter (extending CursorAdaptor) then the code doesn't change a whole lot. You'd be overriding getView and bindView:

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    if (convertView != null) {
        return convertView;
    }
    /* context is the outer activity or a context saved in the constructor */
    return LayoutInflater.from(context).inflate(R.id.my_row);
}

@Override
public void bindView(View view, Context context, Cursor cursor) {
    int color = cursor.getInt(cursor.getColumnIndex("Colour"));
    view.setBackgroundColor(color);
    String label = cursor.getString(cursor.getColumnIndex("GenreLabel"));
    TextView text = (TextView) findViewById(R.id.genre_label);
    text.setText(label);
}

You're doing a bit more manually, but it's more or less the same idea. Note that in all of these examples you might save on performance by caching the column indices instead of looking them up via strings.

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