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java - 使用 while 循环将多个 LinearLayout 添加到滚动视图中

问题描述

我想在我的 ScrollView 中添加多个 LinearLayout，LinearLayout 的数量取决于从 MySQL 数据库中选择了多少数据。但是，似乎不能在 ScrollView 中添加多个 LinearLayout。

原因可能是这样的：指定的孩子已经有了父母。您必须首先在孩子的父母上调用 removeView()。但我不确定真正的原因。我怎么解决这个问题？这是我在 Android Studio 中的编码：

String query = "select * from restaurant";
Statement stmt = con.createStatement();
ResultSet rs = stmt.executeQuery(query);

LinearLayout data_big_layout, detail_data_layout;
TextView name, type_area, price_txt;
ImageView restaurant_img;
LinearLayout.LayoutParams restaurant_img_params, data_big_params;

while(rs.next()){
    data_big_layout = new LinearLayout(this);
    data_big_params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,
    LinearLayout.LayoutParams.WRAP_CONTENT);
    data_big_params.setMargins(0,15,0,0);
    data_big_layout.setLayoutParams(data_big_params);
    data_big_layout.setOrientation(LinearLayout.HORIZONTAL);
    data_big_layout.setWeightSum(20);
    data_big_layout.setBackgroundColor(Color.WHITE);
    data_big_layout.setTag(rs.getInt(1));

    detail_data_layout = new LinearLayout(this);
    lparams = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,
    LinearLayout.LayoutParams.WRAP_CONTENT,8.0f);
    detail_data_layout.setLayoutParams(lparams);
    detail_data_layout.setOrientation(LinearLayout.VERTICAL);
    detail_data_layout.setPadding(50,0,0,0);

    lparams = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,
    LinearLayout.LayoutParams.WRAP_CONTENT);
    name = new TextView(this);
    name.setLayoutParams(lparams);
    name.setText(rs.getString(2));
    name.setTextSize(24);
    name.setTypeface(Typeface.DEFAULT_BOLD);

    type_area = new TextView(this);
    type_area.setLayoutParams(lparams);
    type_area.setText(rs.getString(5)+"/"+rs.getString(6));
    type_area.setTextSize(18);

    price_txt = new TextView(this);
    price_txt.setLayoutParams(lparams);
    price_txt.setText(rs.getString(7));
    price_txt.setTextSize(18);

    detail_data_layout.addView(name);
    detail_data_layout.addView(type_area);
    detail_data_layout.addView(price_txt);

    data_big_layout.addView(detail_data_layout);

    restaurant_img = new ImageView(this);
    restaurant_img_params = new LinearLayout.LayoutParams(200,
    300,12.0f);
    restaurant_img.setImageResource(R.drawable.test_restaurant);
    restaurant_img.setPadding(0,0,50,0);

    data_big_layout.addView(restaurant_img, restaurant_img_params);
    Toast.makeText(getBaseContext(),"ID: "+rs.getInt(1), Toast.LENGTH_LONG).show();

    data_scroll_view.addView(data_big_layout); //Cannot add data_big_layout in the next loop

    z = "Search successful";

}
isSuccess = true;
stmt.close();
rs.close();
con.close();

代码data_scroll_view.addView(data_big_layout); 只能在while循环的第一次运行。我选择了两行数据，但程序中的输出只能显示一个 LinearLayout。我该如何解决？谢谢大家。

标签： javaandroidandroid-layout

解决方案

滚动视图只能包含一个孩子

滚动视图中可能只有一个直接子视图。谷歌文档

因此，在您的循环内，您应该将您的视图收集到一个垂直的 LinearLayout 中，然后将其添加到循环外的 ScrollView 中。

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