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[英]Is it possible to add more than one TableLayout in a LinearLayout with a ScrollView in Android development?
[英]Adding more than one LinearLayout into scrollview using while loop
我想在我的ScrollView中添加多個LinearLayout,LinearLayout的數量取決於從MySQL數據庫中選擇的數據量。 但是,似乎不能在ScrollView中添加多個LinearLayout。
原因可能是這樣的:指定的孩子已經有一個父母。 您必須先在孩子的父母上調用removeView()。 但是我不確定真正的原因。 我怎么解決這個問題? 這是我在Android Studio中的編碼:
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();
代碼為data_scroll_view.addView(data_big_layout); 僅可在while循環的第一次運行。 我選擇了兩行數據,但是程序中的輸出只能顯示一個LinearLayout。 我該如何解決? 謝謝大家
參考https://developer.android.com/reference/android/widget/ScrollView
ScrollView是“一個視圖組,它允許滾動其中放置的視圖層次結構。滾動視圖中可能只有一個直接子級。
要在滾動視圖中添加多個視圖,請使直接子級添加一個視圖組,例如LinearLayout
,然后在該LinearLayout
放置其他視圖。
因此, LinearLayouts
嘗試將LinearLayouts
添加到ScrollView
,不如將一個LinearLayout
作為ScrollView's
子級,並將任何視圖/布局添加到該LinearLayout
。
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