Question

我正在尝试更改listview元素的字体。它是使用自定义列表视图制作的。我在尝试设置listview文本视图的字体时遇到错误。我已经按照相同的教程 site

但仍然出错。错误是我引用了null。我尝试使用取景器时代码有错误。如果我删除代码简单光标adapter.viewfinder代码工作。我创建了一个类来调用并返回它在其他地方工作的字体。下面是设置listview适配器的函数的代码。

let names = ['James', 'james', 'bob', 'JaMeS', 'Bob'];
let uNames = Object.fromEntries(names.map(s => [s.toLowerCase(), s]));

console.log(Object.values(uNames));

这是类fontstyle的代码。

private void displayListView() {
    //sqlite data helper class to receive all the data
        Cursor cursor = dbHelper.fetchAllCountries();

        // The desired columns to be bound
        String[] columns = new String[] { CountriesDbAdapter.KEY_CODE,
                CountriesDbAdapter.KEY_NAME, CountriesDbAdapter.KEY_CONTINENT,
                CountriesDbAdapter.KEY_REGION };

        // the XML defined views which the data will be bound to
        int[] to = new int[] { R.id.code, R.id.name, R.id.continent,
                R.id.region, };

        // create the adapter using the cursor pointing to the desired data
        // as well as the layout information
        dataAdapter = new SimpleCursorAdapter(this, R.layout.country_info,
                cursor, columns, to, 0);

SimpleCursorAdapter.ViewBinder binding = new SimpleCursorAdapter.ViewBinder() {
            @Override
            public boolean setViewValue(View view, Cursor cursor, int columnIndex) {


                TextView txtHeader = (TextView) findViewById(R.id.code);
        txtHeader.setTypeface(FontStyle
        .MonoSocialIconsFont(coursoradapter.this));


TextView txtHeader2 = (TextView) findViewById(R.id.name);
txtHeader2.setTypeface(FontStyle
        .MonoSocialIconsFont(coursoradapter.this));


TextView txtHeader4 = (TextView) findViewById(R.id.continent);
txtHeader4.setTypeface(FontStyle
        .MonoSocialIconsFont(coursoradapter.this));


TextView txtHeader3 = (TextView) findViewById(R.id.region);
txtHeader3.setTypeface(FontStyle
        .MonoSocialIconsFont(coursoradapter.this));


return false;
            };
};
dataAdapter.setViewBinder(binding);


        ListView listView = (ListView) findViewById(R.id.listView1);
        // Assign adapter to ListView
        listView.setAdapter(dataAdapter);

eclipse logcat中的错误是这样的。

package com.asolution.mathreeroute;

import android.content.Context;
import android.graphics.Typeface;

public class FontStyle {
    public static Typeface MonoSocialIconsFont(Context context) {
        Typeface tf = null;
        try {
            tf = Typeface.createFromAsset(context.getAssets(),
                    "MonoSocialIconsFont.ttf");
        } catch (Exception e) { e.printStackTrace(); } return tf; } }

Answer 1

将findViewById功能中的所有view.findViewById替换为setViewValue。

<强> EDITED 在false函数中返回true而不是setViewValue。在你的setValue函数中，你必须放一个switch case。

SimpleCursorAdapter.ViewBinder binding = new SimpleCursorAdapter.ViewBinder() {
    @Override
    public boolean setViewValue(View view, Cursor cursor, int columnIndex) {

        switch (view.getId()) {
            case R.id.code:
            TextView txtHeader = ((TextView) view);
            txtHeader.setTypeface(FontStyle
                    .MonoSocialIconsFont(coursoradapter.this));
            break;

            case R.id.name:
            TextView txtHeader2 = ((TextView) view);
            txtHeader2.setTypeface(FontStyle
                    .MonoSocialIconsFont(coursoradapter.this));
            break;
            case R.id.continent;
            TextView txtHeader4 = ((TextView) view);
            txtHeader4.setTypeface(FontStyle
                    .MonoSocialIconsFont(coursoradapter.this));
            break;

            case R.id.region
            TextView txtHeader3 = ((TextView) view));
            txtHeader3.setTypeface(FontStyle
                    .MonoSocialIconsFont(coursoradapter.this));
        }
        return true;
    }
};

Answer 2

结束以这种方式更改代码

    Typeface font =Typeface.createFromAsset(getAssets(), "Roboto-Thin.ttf");
((TextView) view).setTypeface(font);

部分有效。数据字段已更改。但是必须处理标题

视图中的简单光标适配器错误

2 个答案: