I can list my messages , Listview - xaml

Question

I can list my messages, but now I wanted every message after that I had a balloon. To identify if I sent or received. The balloon is now the text is not staying. Can you help me?
<ListView x:Name="Post_List" Grid.Row="1">
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<Grid ColumnSpacing="2" Padding="5">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"></ColumnDefinition>
<ColumnDefinition Width="40"></ColumnDefinition>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="*"></RowDefinition>
<RowDefinition Height="Auto"></RowDefinition>
</Grid.RowDefinitions>
<Frame Grid.Row="0" OutlineColor="Transparent"
HasShadow="False" Grid.Column="0"
CornerRadius="5" BackgroundColor="#03A9F4">
<Label TextColor="White" Text="{Binding Mensagem}"/>
</Frame>
<Label FontSize="Micro" Grid.Row="1" Grid.Column="0"
Text="{Binding Data}" TextColor="Gray"></Label>
</Grid>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>

Answer 1

Adding HasUnevenRows="True" to your ListView will fix your issue.
This is because you did not set any RowHeight which is alright cause you want the height to be based on the content but the ListView does not know the dimension to apply. Using the HasUnevenRows the ListView will be calculating the size to fit the content.
<ListView x:Name="Post_List" Grid.Row="1" HasUnevenRows="True" >
<ListView.ItemTemplate >
<DataTemplate >
<ViewCell>
<Grid ColumnSpacing="2" Padding="5">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="40" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="*" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<Frame Grid.Row="0" OutlineColor="Transparent" HasShadow="False" Grid.Column="0" CornerRadius="5" BackgroundColor="#03A9F4">
<Label TextColor="White" Text="{Binding Mensagem}"/>
</Frame>
<Label FontSize="Micro" Grid.Row="1" Grid.Column="0" Text="{Binding Data}" TextColor="Gray"></Label>
</Grid>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
Hope this helps.-