Question

I’ve rearranged my code that dynamically creates widgets/views and, although the xml layout appears to be “well-formed” (it compiles), when I get to the corresponding “setContentView()” it crashes.

IOW:

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.ondemandandautomatic_dynamicauthorize); <-- crashes when I F6 (Eclipse) on this line

…So then I noticed in my xml layout file a warning icon: “This TableLayout is useless (no children, no background, no id)”

Well, I’m going to add the children at runtime; why does it need a background? And the big question: why does it say it has no id, when I’ve added one:

<TableLayout>
android:id="@id/tlDynamicRows" <-- IT'S RIGHT THERE!!!
android:layout_width="match_parent"
android:layout_height="match_parent" > 
</TableLayout>

There is another warning at the that says, “This TableRow or its TableRow parent is useless”

Here’s the entire xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <TableLayout
        android:id="@+id/tlDynamic"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >

        <TableRow> <- This is where it says, "This TableRow or its TableRow parent is useless"

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_margin="2dip"
                android:text="@string/demand"
                android:textAppearance="?android:attr/textAppearanceSmall" />

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_margin="2dip"
                android:text="@string/time"
                android:textAppearance="?android:attr/textAppearanceSmall" />

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_margin="2dip"
                android:text="@string/space"
                android:textAppearance="?android:attr/textAppearanceSmall" />

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_margin="2dip"
                android:text="@string/contact"
                android:textAppearance="?android:attr/textAppearanceMedium" />
        </TableRow>
    </TableLayout>

    <ScrollView
        android:id="@+id/scrollViewHost"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:fillViewport="true" >

        <TableLayout> <- This is where it says, "says, "This TableRow or its TableRow parent is useless"
        android:id="@id/tlDynamicRows"
        android:layout_width="match_parent"
        android:layout_height="match_parent" > 
        </TableLayout>
    </ScrollView>

</LinearLayout>

What could be causing this revolting development?

Updated:

When looking over my post, I saw that the final “TableLayout” in the xml had a superfluous right angle bracket. So, I took the first one out, and now I get an err msg, namely, “No resource found that matches the given name (at ‘id’ with value ‘@id/tlDynamicRows’).”

That part of the xml is now:

<TableLayout
    android:id="@id/tlDynamicRows"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >
</TableLayout>

What gives?

Update:

Here’s the xml that finally works:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <TableLayout
        android:id="@+id/tlDynamic"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >

        <TableRow
            android:layout_width="match_parent"
            android:layout_height="wrap_content" >

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_margin="2dip"
                android:text="@string/demand"
                android:textAppearance="?android:attr/textAppearanceSmall" />

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_margin="2dip"
                android:text="@string/time"
                android:textAppearance="?android:attr/textAppearanceSmall" />

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_margin="2dip"
                android:text="@string/space"
                android:textAppearance="?android:attr/textAppearanceSmall" />

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_margin="2dip"
                android:text="@string/contact"
                android:textAppearance="?android:attr/textAppearanceMedium" />
        </TableRow>
    </TableLayout>

    <ScrollView
        android:id="@+id/scrollViewHost"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:fillViewport="true" >

        <TableLayout
            android:id="@+id/tlDynamicRows"
            android:layout_width="match_parent"
            android:layout_height="match_parent" >
        </TableLayout>
    </ScrollView>

</LinearLayout>

I still had a warning message to change this line in the TableLayout inside the ScrollView:

android:layout_height="wrap_content"

to:

android:layout_height="wrap_content"

I did, and it seemed to make no difference – but it got rid of the Warning, so I’ll leave it.

Answer 1

There are several points to be noted in the XML you posted above:

1- When you are using the first Table Row

  <TableRow> <- This is where it says, "This TableRow or its TableRow parent is useless"

In this line you are not specifying the layout_height and layout_width attributes of the row, that is why you are getting “useless” in warning.

2- Another point is try giving id to Table Layout in Scroll view at the botton as:

 android:id="@+id/tlDynamicRows"

instead of

 android:id="@id/tlDynamicRows"

hope these work for you.