从解析中检索数据到recyclerview

Question

我的代码应从解析数据库中检索标题并将其设置为TextView。 当检索到textview的标题后，它显示了一个没有String的空白TextView。

这是我的代码

final TextView textView1 = (TextView) findViewById(R.id.textView);
final TextView textView2 = (TextView) findViewById(R.id.textView2);
final TextView textView3 = (TextView) findViewById(R.id.textView3);
final TextView textView4 = (TextView) findViewById(R.id.textView4);

ParseQuery<ParseObject> query = ParseQuery.getQuery("Ads");
query.getInBackground("xWMyZ4YEGZ", new GetCallback<ParseObject>() {
    @Override
    public void done(ParseObject parseObject, com.parse.ParseException e) {
        if (e == null) {
            t = parseObject.getString("title");;
            ParseFile image = parseObject.getParseFile("adPhoto");
        } else {
        }
    }
});
textView1.setText(t);

}

为什么我不能将String t设置为textview，有人可以帮助我吗？ 请。

Answer 1

您有一个小错误，应该在执行查询后设置texview

final TextView textView1 = (TextView) findViewById(R.id.textView);
        final TextView textView2 = (TextView) findViewById(R.id.textView2);
        final TextView textView3 = (TextView) findViewById(R.id.textView3);
        final TextView textView4 = (TextView) findViewById(R.id.textView4);

        ParseQuery<ParseObject> query = ParseQuery.getQuery("Ads");
        query.getInBackground("xWMyZ4YEGZ", new GetCallback<ParseObject>() {
            @Override
            public void done(ParseObject parseObject, com.parse.ParseException e) {
                if (e == null) {
                    t = parseObject.getString("title");;
                    ParseFile image = parseObject.getParseFile("adPhoto");
                    // this should be call on ui thread
                    textView1.setText(t);
                } else {
                }
            }
        });

Answer 2

你必须写

textView1.setText（t）

在完成的方法中