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PO
 

Note that there are some explanatory texts on larger screens.

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    <p>change <code>private void sendMessage(View view)</code> to <code>public void sendMessage(View view)</code> (private to public)</p> <p>LAYOUT OF FIRST ACTIVITY: </p> <pre><code>&lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:orientation="horizontal" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center_vertical" &gt; &lt;TextView android:id="@+id/TextView1_MainActivity" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@+string/title_MainActivity" android:textStyle="bold"/&gt; &lt;EditText android:id="@+id/EditText1_MainActivity" android:layout_width="wrap_content" android:layout_height="wrap_content" android:hint="@string/EditText_MainActivity" android:textStyle="italic" /&gt; &lt;Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/Button_MainActivity" android:onClick="sendMessage"/&gt; </code></pre> <p></p> <p>LAYOUT OF SECOND ACTIVITY: -</p> <pre><code>&lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="horizontal" android:gravity="center_vertical" tools:context=".SecondActivity"&gt; &lt;TextView android:layout_alignParentTop="true" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@+string/title_SecondActivity" android:textStyle="bold"/&gt; &lt;TextView android:id="@+id/TextView2_SecondActivity" android:layout_width="wrap_content" android:layout_height="wrap_content" /&gt; </code></pre> <p></p>
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    1. POMy app stops working
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    1. USShijil
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    1. CO` android:gravity="center_vertical" ` gives the error saying String types not allowed (at 'gravity' with value 'center_vertical')
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    2. COcopy and paste posted xml code .. it working
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    3. COOK the error is gone now. But after your tweaks, nothing has happened except that all the widgets in the first activity have come in the centre of the screen. I did not want that but it doesn't matter. The important thing is that the second activity is still now displaying. The app stops before that.
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

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