Android 无法从片段内更新TableLayout

我正在开发一个应用程序，它可以让用户进行一次测验，并记录所有测验分数，以便以后需要时参考。我正在构建一个片段，允许用户在TableLayout中查看此记录。我需要动态添加行，所以我正在尝试创建一种在片段的onCreateView方法期间添加行的方法。但是，尽管这些行在调试器中显示为表的子行，但它们从未在应用程序中显示。我试着先拆下碎片，然后再重新连接，但这根本没用。我非常感激能想出这个办法

这是片段：

public class GalleryFragment extends Fragment {

    private GalleryViewModel galleryViewModel;

    public void addEntryToTable(TableLayout table, String user, String date, String score) {

        QuizHistoryTableRow row = new QuizHistoryTableRow(getContext(), user, date, score);
        table.addView(row);
    }

    public View onCreateView(@NonNull LayoutInflater inflater,
                             ViewGroup container, Bundle savedInstanceState) {
        View root = inflater.inflate(R.layout.fragment_gallery, container, false);

        TableLayout table = root.findViewById(R.id.quiz_history_table);
        addEntryToTable(table, "user", "date", "score");

        return root;
    }
}

public class GalleryFragment extends Fragment {

    private GalleryViewModel galleryViewModel;

    public TableRow getNewEntry(Context context, String user, String date, String score) {

        QuizHistoryTableRow row = new QuizHistoryTableRow(context, user, date, score);
        row.setLayoutParams(new TableRow.LayoutParams(TableRow.LayoutParams.MATCH_PARENT, TableRow.LayoutParams.WRAP_CONTENT));
        return row;
    }

    public View onCreateView(@NonNull LayoutInflater inflater,
                             ViewGroup container, Bundle savedInstanceState) {
        View root = inflater.inflate(R.layout.fragment_gallery, container, false);

        TableLayout table = root.findViewById(R.id.quiz_history_table);
        TableRow row = getNewEntry(getContext(), "user", "date", "score");
        table.addView(row, new TableLayout.LayoutParams(TableLayout.LayoutParams.MATCH_PARENT, TableLayout.LayoutParams.WRAP_CONTENT));
        return root;
    }

}

这是自定义表行：

public class QuizHistoryTableRow extends TableRow {

    public QuizHistoryTableRow(Context context, String user, String date, String score){
        super(context);

        TextView userView = new TextView(context);
        userView.setLayoutParams(new TableLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT, 1f));
        userView.setText(user);
        userView.setTextColor(0);
        userView.setTextSize(22);

        TextView dateView = new TextView(context);
        dateView.setLayoutParams(new TableLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT, 1f));
        dateView.setText(date);
        dateView.setTextColor(0);
        dateView.setTextSize(22);

        TextView scoreView = new TextView(context);
        scoreView.setLayoutParams(new TableLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT, 1f));
        scoreView.setText(score);
        scoreView.setTextColor(0);
        scoreView.setTextSize(22);

        addView(userView);
        addView(dateView);
        addView(scoreView);
    }

}

public class QuizHistoryTableRow extends TableRow {

    public QuizHistoryTableRow(Context context, String user, String date, String score){
        super(context);

        TextView userView = new TextView(context);
        userView.setText(user);
        userView.setTextColor(Color.BLACK);
        userView.setTextSize(22);
        userView.setLayoutParams(new LayoutParams(TableRow.LayoutParams.MATCH_PARENT, TableRow.LayoutParams.WRAP_CONTENT, 1f));

        TextView dateView = new TextView(context);
        dateView.setText(date);
        dateView.setTextColor(Color.BLACK);
        dateView.setTextSize(22);
        dateView.setLayoutParams(new LayoutParams(TableRow.LayoutParams.MATCH_PARENT, TableRow.LayoutParams.WRAP_CONTENT, 1f));

        TextView scoreView = new TextView(context);
        scoreView.setText(score);
        scoreView.setTextColor(Color.BLACK);
        scoreView.setTextSize(22);
        scoreView.setLayoutParams(new LayoutParams(TableRow.LayoutParams.MATCH_PARENT, TableRow.LayoutParams.WRAP_CONTENT, 1f));

        addView(userView);
        addView(dateView);
        addView(scoreView);
    }

}

---

修复了它，这是与

TableLayout.LayoutParams

vs

TableRow.LayoutParams

有关的问题。谢谢迈克M.的回答

修改片段：

public class GalleryFragment extends Fragment {

    private GalleryViewModel galleryViewModel;

    public void addEntryToTable(TableLayout table, String user, String date, String score) {

        QuizHistoryTableRow row = new QuizHistoryTableRow(getContext(), user, date, score);
        table.addView(row);
    }

    public View onCreateView(@NonNull LayoutInflater inflater,
                             ViewGroup container, Bundle savedInstanceState) {
        View root = inflater.inflate(R.layout.fragment_gallery, container, false);

        TableLayout table = root.findViewById(R.id.quiz_history_table);
        addEntryToTable(table, "user", "date", "score");

        return root;
    }
}

public class GalleryFragment extends Fragment {

    private GalleryViewModel galleryViewModel;

    public TableRow getNewEntry(Context context, String user, String date, String score) {

        QuizHistoryTableRow row = new QuizHistoryTableRow(context, user, date, score);
        row.setLayoutParams(new TableRow.LayoutParams(TableRow.LayoutParams.MATCH_PARENT, TableRow.LayoutParams.WRAP_CONTENT));
        return row;
    }

    public View onCreateView(@NonNull LayoutInflater inflater,
                             ViewGroup container, Bundle savedInstanceState) {
        View root = inflater.inflate(R.layout.fragment_gallery, container, false);

        TableLayout table = root.findViewById(R.id.quiz_history_table);
        TableRow row = getNewEntry(getContext(), "user", "date", "score");
        table.addView(row, new TableLayout.LayoutParams(TableLayout.LayoutParams.MATCH_PARENT, TableLayout.LayoutParams.WRAP_CONTENT));
        return root;
    }

}

和修改后的表行：

public class QuizHistoryTableRow extends TableRow {

    public QuizHistoryTableRow(Context context, String user, String date, String score){
        super(context);

        TextView userView = new TextView(context);
        userView.setLayoutParams(new TableLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT, 1f));
        userView.setText(user);
        userView.setTextColor(0);
        userView.setTextSize(22);

        TextView dateView = new TextView(context);
        dateView.setLayoutParams(new TableLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT, 1f));
        dateView.setText(date);
        dateView.setTextColor(0);
        dateView.setTextSize(22);

        TextView scoreView = new TextView(context);
        scoreView.setLayoutParams(new TableLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT, 1f));
        scoreView.setText(score);
        scoreView.setTextColor(0);
        scoreView.setTextSize(22);

        addView(userView);
        addView(dateView);
        addView(scoreView);
    }

}

public class QuizHistoryTableRow extends TableRow {

    public QuizHistoryTableRow(Context context, String user, String date, String score){
        super(context);

        TextView userView = new TextView(context);
        userView.setText(user);
        userView.setTextColor(Color.BLACK);
        userView.setTextSize(22);
        userView.setLayoutParams(new LayoutParams(TableRow.LayoutParams.MATCH_PARENT, TableRow.LayoutParams.WRAP_CONTENT, 1f));

        TextView dateView = new TextView(context);
        dateView.setText(date);
        dateView.setTextColor(Color.BLACK);
        dateView.setTextSize(22);
        dateView.setLayoutParams(new LayoutParams(TableRow.LayoutParams.MATCH_PARENT, TableRow.LayoutParams.WRAP_CONTENT, 1f));

        TextView scoreView = new TextView(context);
        scoreView.setText(score);
        scoreView.setTextColor(Color.BLACK);
        scoreView.setTextSize(22);
        scoreView.setLayoutParams(new LayoutParams(TableRow.LayoutParams.MATCH_PARENT, TableRow.LayoutParams.WRAP_CONTENT, 1f));

        addView(userView);
        addView(dateView);
        addView(scoreView);
    }

}

---

userView.setTextColor（0）

–零是透明的。如果你想让它是黑色的，那么它应该是

0xff000000

。不过，最好使用@MikeM。谢谢你的回复，我把它改成了黑色，但由于某种原因它还是没有出现。有什么想法吗？哦，是的，这是

布局参数

；至少，还有一件事。

视图

的

布局参数

必须是其父级的类型，因为它是父级了解如何布局该子级的信息。在这种情况下，您的

文本视图

位于

表格行

，因此它们需要

表格行.布局参数

，而不是

表格布局.布局参数

。有时，某些类型的

LayoutParams

可以成功转换为另一种类型，但

TableLayout

对此非常挑剔。由于您位于

TableRow

类中，因此您可以从这些构造函数调用的开头删除

TableLayout.

。此外，尽管这不会导致当前问题，但我还要提到，无论何时使用权重，与方向相对应的维度的值应为

0

。也就是说，因为它们是水平的，所以宽度应该是

0

。总之：

newlayoutparams（0，LayoutParams.WRAP_CONTENT，1f）

@MikeM。谢谢，我会的。