Question

我正在尝试将DbHandler.java中的数据添加到textView中的MainActivity.java. 我已经完成了一个类似的项目，使用listView向List<String>添加数据现在我想为textView

做这件事

我的MainActivity.java代码填充列表视图：

public void onItemClick(AdapterView<?> parent, View view, int position, long id)
{
    String loc = parent.getItemAtPosition(position).toString();
    DbHandler db = new DbHandler(getApplicationContext());
    List<String> BusNoListUsingLoc = db.getBusNoUsingLoc(loc);
    ArrayAdapter<String> lvAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, BusNoListUsingLoc);
    listView.setAdapter(lvAdapter);

}

我的DbHandler.java：

 public List<String> getBusNoUsingLoc(String loc)
{
    List<String> BusRouteList = new ArrayList<String>();

    try
    {
        SQLiteDatabase db = this.getWritableDatabase();
        String[] cols={"From_Loc","To_Loc","Route_1","Route_2","Route_3","Route_4","Route_5","Route_6","Route_7","Route_8","Route_9","Route_10","Route_11","Route_12","Route_13","Route_14","Route_15"};
        String query="SELECT Bus_No_Type FROM MDUBusRoutes WHERE";
        for (int i=0;i<cols.length;i++)
        {
            if(i!=cols.length-1)
                query+=" UPPER(" + cols[i] + ")= UPPER(?) OR";
            else
                query+=" UPPER(" + cols[i] + ")= UPPER(?) ORDER BY Total_Stops DESC";
        }
        Cursor CursorLocationRoute = db.rawQuery(query, new String[]{loc,loc,loc,loc,loc,loc,loc,loc,loc,loc,loc,loc,loc,loc,loc,loc,loc});
        if (CursorLocationRoute.moveToFirst())
        {
            do
            {
                BusRouteList.add(CursorLocationRoute.getString(0));
            }
            while (CursorLocationRoute.moveToNext());
        }
        CursorLocationRoute.close();
        db.close();
    } catch (Exception ignored)
    {

    }
    return BusRouteList;
}

输出： enter image description here

Answer 1

在我看来，ListView会更好地为你服务，因为它会在需要时滚动，它会使你的行保持良好和一致，它基本上会处理你拥有的任何可变长度条目，但如果你真的想要使用TextView执行此操作然后尝试：

（如果您需要滚动，因为条目数量太大而您的TextView不再适合屏幕，那么您需要将LinearLayout放入{{1} }}。）

在您的活动布局文件中放置ScrollView并定义ID。

LinearLayout

您可以根据需要更改LinearLayout linearLayout = (LinearLayout) findViewById(R.id.linear_layout_id); for(String s : BusRouteList){ TextView tv = new TextView(this); tv.setText(s); tv.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.WRAP_CONTENT)); linearLayout.addView(tv); }。

如何从数据库中检索数据并将其添加到textview？。这类似于向listview添加数据

1 个答案: