如何在 Android 的对话框中更改列表顺序答案

【问题标题】：How do I change list order in a dialog box on Android如何在 Android 的对话框中更改列表顺序
【发布时间】：2017-03-02 00:15:05
【问题描述】：

我有一个对话框列出了我的 sqlite 数据库中的结果，但它向后列出了它们（最旧的条目在前）。我怎样才能使用这个列表（最新列出的第一）？请帮忙。谢谢！

    if (view == btnViewAll) {
        Cursor c = db.rawQuery("SELECT * FROM number", null);
        if (c.getCount() == 0) {
            showMessage("Error", "No records found");
            return;
        }
        StringBuffer buffer = new StringBuffer();
        while (c.moveToNext()) {
            buffer.append("Meter Number: " + c.getString(0) + "\n");
            buffer.append("Read: " + c.getString(1) + c.getString(2) +c.getString(3) + c.getString(4) + c.getString(5) + "\n");
            buffer.append("Date Read: " + c.getString(6) + "\n\n");
        }
        showMessage("Meter Details", buffer.toString());
    }


}

public void showMessage(String title, String message) {
    AlertDialog.Builder builder = new AlertDialog.Builder(this);
    builder.setCancelable(true);
    builder.setTitle(title);
    builder.setMessage(message);
    builder.show();
}

【问题讨论】：

标签： android android-cursor

【解决方案1】：

改变你的查询，你就完成了

Cursor c = db.rawQuery("SELECT * FROM number ORDER BY <column_name> DESC", null);

【讨论】：

我试过了，但它并不总是拉起最后一个输入。我可以添加一个列，为每个输入提供一个自动增加的行号吗？如果是这样，我不知道从哪里开始编写代码。你能帮我吗？谢谢！

【解决方案2】：

我用这个替换它：

    if (view == btnViewAll) {
        if (editText6.getText().toString().trim().length() == 0) {
            Cursor c = db.rawQuery("SELECT * FROM number ORDER BY id DESC", null);
            if (c.getCount() == 0) {
                Toast ToastMessage = Toast.makeText(this, "      No Records Found      ", Toast.LENGTH_LONG);
                ToastMessage.setGravity(Gravity.CENTER | Gravity.CENTER_HORIZONTAL, 0, 0);
                View toastView = ToastMessage.getView();
                toastView.setBackgroundResource(R.drawable.shape9);
                ToastMessage.show();
                return;
            }
            StringBuffer buffer = new StringBuffer();
            while (c.moveToNext()) {
               // buffer.append("Entry Id: " + c.getString(0) + "\n");
                buffer.append("Meter Number: " + c.getString(1) + "\n");
                buffer.append("Read: " + c.getString(2) + c.getString(3) + c.getString(4) + c.getString(5) + c.getString(6) + "\n");
                buffer.append("Status: " + c.getString(8) + "\n");
                buffer.append("Address: " + c.getString(9) + "\n");
                buffer.append("Date Read: " + c.getString(7) + "\n\n");
            }
            showMessage("Meter Details", buffer.toString());
        } else {
            if (editText6.getText().toString().trim().length() > 0) {
                Cursor c = db.rawQuery("SELECT * FROM number WHERE meter='" + editText6.getText() + "'ORDER BY id DESC", null);
                if (c.getCount() == 0) {
                    Toast ToastMessage = Toast.makeText(this, "      No Records Found      ", Toast.LENGTH_LONG);
                    ToastMessage.setGravity(Gravity.CENTER | Gravity.CENTER_HORIZONTAL, 0, 0);
                    View toastView = ToastMessage.getView();
                    toastView.setBackgroundResource(R.drawable.shape9);
                    ToastMessage.show();
                    return;
                }
                StringBuffer buffer = new StringBuffer();
                while (c.moveToNext()) {
                    //buffer.append("Entry Id: " + c.getString(0) + "\n");
                    buffer.append("Meter Number: " + c.getString(1) + "\n");
                    buffer.append("Read: " + c.getString(2) + c.getString(3) + c.getString(4) + c.getString(5) + c.getString(6) + "\n");
                    buffer.append("Status: " + c.getString(8) + "\n");
                    buffer.append("Address: " + c.getString(9) + "\n");
                    buffer.append("Date Read: " + c.getString(7) + "\n\n");
                }
                showMessage("Meter Details", buffer.toString());
            }
        }
    }
}
public void showMessage(String title, String message) {
    AlertDialog.Builder builder = new AlertDialog.Builder(this);
    builder.setCancelable(true);
    builder.setTitle(title);
    builder.setMessage(message);
    builder.show();
}

【讨论】：