Dynamically Created Layout not Showing

Question

I've looked at this question here, however I still cannot find out what I'm doing wrong. There are no errors in Logcat and there definitely is data being passed to it to be made. Here's my setup:

This is all taking place below manually placed elements that I have placed in Android Studio. I have a ScrollView. Inside that ScrollView, I have a LinearLayout, parentLayout, that get's passed to this class. This method is supposed to add another Horizontal LinearLayout, layout, parentLayout. Then it is supposed to add a TextView, titleDisplay, and two Buttons to layout. So far I have only programmed just layout and titleDisplay. I tested it, and nothing was added. So before I program the other two buttons, I would like to know what I am doing wrong. Here's the Java Code:

public class FollowupOption {

private String displayName;
private JSONObject jsonInformation;
private Context context;
private LinearLayout parentLayout;

private LinearLayout layout;
private TextView titleDisplay;
private Button deleteButton, editButton;

public FollowupOption(String displayName, JSONObject jsonInformation,
                      Context context, LinearLayout parentLayout){
    this.displayName = displayName;
    this.jsonInformation = jsonInformation;
    this.context = context;
    this.parentLayout = parentLayout;
    buildLayout();
}

private void buildLayout(){
    //Horizontal Linear Layout to hold everything
    this.layout = new LinearLayout(context);
    this.layout.setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
    this.layout.setOrientation(LinearLayout.HORIZONTAL);
    this.parentLayout.addView(this.layout);
    //Text View Displaying title of followup option.
    this.titleDisplay = new TextView(context);
    try {
        this.titleDisplay.setText(this.jsonInformation.getJSONObject("list").getString("title"));
    } catch(JSONException e){ e.printStackTrace(); }
    this.titleDisplay.setTextColor(0x8f142a); //Black
    this.titleDisplay.setTextSize(18);
    this.titleDisplay.setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT, 1f));
    this.layout.addView(this.titleDisplay);
}
}

Here's my XML:

<?xml version="1.0" encoding="utf-8"?>
<merge xmlns:android="http://schemas.android.com/apk/res/android">

    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/parent"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:paddingTop="10dp">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="38dp"
            android:orientation="horizontal">

            <TextView
                android:id="@+id/textView15"
                android:layout_width="wrap_content"
                android:layout_height="match_parent"
                android:layout_weight="0.22"
                android:gravity="center"
                android:text="@string/followup_text"
                android:textColor="@color/myRed"
                android:textSize="18sp" />

            <Button
                android:id="@+id/followup_add_button"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:background="@android:color/transparent"
                android:text="@string/plus"
                android:textAlignment="center"
                android:textColor="@android:color/holo_green_dark"
                android:textSize="30sp"
                android:textStyle="bold" />
        </LinearLayout>

        <ScrollView
            android:layout_width="match_parent"
            android:layout_height="279dp"
            android:paddingLeft="7dp"
            android:paddingRight="7dp"
            android:paddingTop="7dp">

            <LinearLayout
                android:id="@+id/followup_parent"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="vertical">

            </LinearLayout>
        </ScrollView>

        <Button
            android:id="@+id/followup_new_button"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="@string/new_followup_text" />
    </LinearLayout>
</merge>

If someone could let me know what I am doing wrong or a good way to debug something like this, that would be appreciated.

Are you seeing a stack trace? Can you try replacing `this.titleDisplay.setText(...)` with some static text? — Milk, Aug 03 '17 at 20:55
LogCat doesn't show any errors. I just tried you suggestion about static text, and still nothing appears. Thanks, though. — SH7890, Aug 03 '17 at 20:58

score 1 · Accepted Answer · edited Aug 04 '17 at 12:22

1

Are you adding this.layout view to some view?

UPD: The problem is with your text color. Consider using the Color class to get color from its hex value or constants from that class.

edited Aug 04 '17 at 12:22

SH7890

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answered Aug 03 '17 at 20:44

Anton Potapov

1,265
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Doesn't this line `this.parentLayout.addView(this.layout);` do that? – SH7890 Aug 03 '17 at 20:45
What is `this.parentLayout`? I may be that the `parentLayout` is not added to the view. – Milk Aug 03 '17 at 20:46
1

Ye, it does. Can you provide the full code of this class? Have no idea why this is not working – Anton Potapov Aug 03 '17 at 20:46
@Milk As I stated in the question, `parentLayout` is a LinearLayout already in the View passed to this class. – SH7890 Aug 03 '17 at 20:46
@PotapovAnton Just did. There's not much else, though. Just a constructor. – SH7890 Aug 03 '17 at 20:48
The color thing was the problem. I used the Color class. Thanks a ton! – SH7890 Aug 04 '17 at 12:19

score 0 · Answer 2 · answered Aug 03 '17 at 20:58

0

Does your XML view (without the addition of the dynamic layout) take up the entire screen?

The new LinearLayout view will be added below the button. If the button is at the bottom of the screen, the layout will be added off the screen and therefore not visible.

You should add your new layout to the scroll view instead.

answered Aug 03 '17 at 20:58

Milk

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I beleive, views are adding in scrollview in the middle of the screen – Anton Potapov Aug 03 '17 at 20:59
Well, I thought that the new LinearLayout would be added to `parentLayout` (which is followup_parent in the xml). I'll try your suggestion about adding it just to the ScrollView. – SH7890 Aug 03 '17 at 21:01
Can you try hard coding some views in the `parentView` in the XML to see if it's an issue adding the view dynamically, or an issue with the layout? – Milk Aug 03 '17 at 21:10
Just did that, and it works fine in there. Just can't get it to make it dynamically. – SH7890 Aug 04 '17 at 12:12

Dynamically Created Layout not Showing

2 Answers2