Develop Reference

Pull Down Map Android - Facebook Effect

I am currently working on a prototype where I have two fragments in a LinearLayout.
Here is what the xml looks like:
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<FrameLayout
android:id="#+id/map_holder"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_above="#id/footer"
android:layout_weight=".30"
>
</FrameLayout>
<FrameLayout
android:id="#+id/list_holder"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_above="#id/footer"
android:layout_weight=".70"
>
</FrameLayout>
</LinearLayout>
The top fragment is a map fragment and the bottom fragment is just a list of items. I am trying to expand the map when the user clicks on the fragment. The height changes from .3 to 1. Currently I have tried to animate and change the height of the fragment, this gives horrible performance. I have looked around and found that Facebook Nearby Places does this effect smoothly. Should I be using the ScaleAnimation class to do this? Thank you for your help.
Edit:
Foursquare has the same type of effect. When click on the map it scales smoothly into fullscreen I have attached a screen shot.
Here is an example of what it looks like:
http://im.tech2.in.com/gallery/2013/apr/foursquareforandroid_041425247544_640x360.jpg

Receiving click/swipe events on a view behind a transparent item of a listview

I have a layout similar to Foursquare (image), where a View (in their case, a map) is behind a ListView, but is visible because the first element is transparent.
I need the View behind the ListView to take touch and swipe events. Is there a way to make only that first invisible item of the ListView ignore these events and allow the events to propagate to the View behind it, but have the rest of the ListView items take the events as usual?
I'm just hoping I won't have to completely abandon the ListView and use a ScrollView instead, because I've already implemented a lot of ListView specific features.

ScrollView on the back will work normaly unless you click the button:
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ScrollView
android:id="#+id/bottom"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/text"
android:text="asdfasdfa Put more text for testing sdfasdfasdfasdfasdfff
afdasdfasdfasdfasdfasdf
asdfasdfa"/>
</ScrollView>
<LinearLayout
android:id="#+id/top"
android:layout_height="match_parent"
android:layout_width="match_parent">
<Button
android:id="#+id/butt"
android:layout_height="100dp"
android:layout_width="200dp"
android:text="Test"/>
</LinearLayout>
</FrameLayout>
Both of the layers/frames have height and width set to match_parent (full screen in this case). And you can basicaly put anything you want into both of this layers as you need it.

Android layout - listview and edittext below

I'm trying to mimic the behaviour of the HTC SMS application (tradional view), where all messages are shown, and an EditTextis shown below. As you can see in the screenshot, when scrolling upwards, the EditText scrolls away at the bottom.
I'm stuck with this, even after reading multiple posts (eg Android Layout with ListView and Buttons and this website: http://www.finalconcept.com.au/article/view/android-keeping-buttons-visible), it's not working as expected.
Thanks to the comments and EditText now showing under ListView, I've managed to have my ListView take all available space and start scrolling once completed. The EditText is showing at the bottom of the screen now - always. I'd like it to disappear at the bottom when I scroll up though - now it remains at the bottom
Current Code:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<ListView
android:id="#android:id/android:list"
android:layout_width="fill_parent"
android:layout_height="0dp"
android:layout_weight="1"
/>
<TableLayout
android:layout_weight="0"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<TableRow>
<EditText android:id="#+id/newmessagecontent"
android:layout_height="150dp"
android:singleLine="false"
android:gravity="top"
android:layout_width="250dp"
android:layout_alignParentTop="true"
/>
<Button android:layout_height="wrap_content"
android:id="#+id/sendmessage"
android:text="Send"
android:layout_width="wrap_content"
/>
</TableRow>
</TableLayout>
</LinearLayout>

i think what you need to implement here is some sort of modification of the SeparatedListAdapter from Jeff Sharkey from this Article. In this article he not only manages to add two Adapters to a ListView but also explains how to have Headers to separate them if you want (you can remove that part of the code).
So what i mean, is your first Adapter will be the data with It's rows, and the second Adapter will be a dummy one with no data that just points to a View with your controls or whatever.
this way the ListView and what you want to add at the bottom are gonna be all scrollable.
Hope this helps.

A ListView automatically scrolls if all the items in it take up more space than the view provides. What happens if you remove the ScrollView?

Scrolling between views

I'm currently working on a game for android.
I have three ImageView's next to each other, they're positioned next to each other using the "android:layout_toRightOf". The views are located within a RelativeLayout tag. Each of these views are centered into the middle of the screen using "android:scaleType="fitCenter"" and they fill the entire screen.
I'm attempting to implement a horizontal scroll from one view to another so that I basically get one view on my screen at a time.
Here is the code that I'm currently using
<HorizontalScrollView android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:fillViewport="true"
android:scrollbars="none">
<RelativeLayout android:id="#+id/GameBg"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<ImageView android:id="#+id/GameImageContainer3"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:scaleType="fitCenter"
android:layout_toRightOf="#+id/GameImageContainer2"
/>
<ImageView android:id="#+id/GameImageContainer2"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:scaleType="fitCenter"
android:layout_toRightOf="#+id/GameImageContainer1"
/>
<ImageView android:id="#+id/GameImageContainer1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:scaleType="fitCenter"
/>
</RelativeLayout>
</HorizontalScrollView>
What I'm currently getting is three images next to each other -- but sometimes they take up less then an entire screen. I want both the left and right padding to be correct, so that I can only see one image at a time.
Any ideas?

Have you tried the Gallery Widget. It seems to be what you are looking for. Be sure to also check out the Gallery tutorial.

Try using a ViewFlipper
http://www.androidpeople.com/android-viewflipper-example/

Getting a button to scroll into view at the bottom of a GridView on Android

I am trying to port an existing iPhone application to android. I wish to have a button scroll into view at the bottom of a GridView to enable the user to load more data from the server. Presently, my solution simply fixes a button at the bottom of the screen instead of having it scroll into view.
Here is my layout code:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
>
<GridView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/grid"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:columnWidth="70dp"
android:numColumns="auto_fit"
android:verticalSpacing="0dp"
android:horizontalSpacing="0dp"
android:stretchMode="columnWidth"
android:gravity="center"
android:background="#000000"
/>
<Button
android:id="#+id/load_more"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Load More"
/>
</LinearLayout>
Fixing the button at the bottom of the screen won't work because I plan on placing an ad at the bottom.
Can anyone either explain conceptually how to get a load more button to scroll into view, or point me to some sample code, OR tell me why this is not idiomatic to Android and what other UI convention it uses to load more data in a GridView?
Thanks!

You can place a ScrollView inside your main LinearLayout. A ScrollView can only have one direct child, though, so you'll need to put another LinearLayout inside of it which would then contain your GridView and Button.

I had a similar problem with scrolling a GridView and after refreshing the underlying data, noticing that the scoll was not reset to the beginning. I solved it with the following code fragment
gvKeys.setSelection(0);
I'm guessing that if you know the number of items in your grid, N, that the following will work:
gvKeys.setSelection(N);