Develop Reference

How to resize View with pull the edge gesture?

I am looking for solution as on images bellow:
I need to have two resizable views in one layout.
User just needs to move separation line to the top (ScrolView B becames higher) or to the bottom (ScrolView A becames higher).
What is the best solution, which gives this behavior? I know that I can extends from ScrollView and override public boolean onTouchEvent(MotionEvent ev) and protected void onDraw(Canvas canvas), but may be there is more simple solution. I want to avoid calculation the math of moving. Thank you for any information.

If you want to solve this problem quickly, I suggest you use Split Pane Layout.
Usage :
<com.mobidevelop.spl.widget.SplitPaneLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:spl="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:id="#+id/splitPaneLayout"
android:layout_height="match_parent"
spl:splitterSize="12dp"
spl:orientation="vertical"
spl:splitterPosition="50%"
spl:splitterBackground="#781b23">
<ScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="5dp"
android:text="" />
</ScrollView>
<ScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="5dp"
android:text=""/>
</ScrollView>
</com.mobidevelop.spl.widget.SplitPaneLayout>
I solved your problem by creating two xmls for portrait and landscape mode. For portrait mode, i set the panel's orientation as vertical by adding spl:orientation="vertical" and for lanscape mode, i set the panel's orientation as horizontal by adding spl:orientation="horizontal".
After doing all this, I got the look like below.

Made this into an answer.
You basically want the split screen view from Android N. You could base your code off the open source implementation in SystemUI:
http://androidxref.com/7.1.1_r6/xref/frameworks/base/packages/SystemUI/src/com/android/systemui/stackdivider/DividerView.java
Along with this for the handle:
http://androidxref.com/7.1.1_r6/xref/frameworks/base/packages/SystemUI/src/com/android/systemui/stackdivider/DividerHandleView.java
You can throw away all code that has to do with stacks (which is the row of screenshots off different activities in your history), buss events and anything that has to do with running another activity, such as the code for Vsyncing between apps (mSurfaceFlingerOffsetMs).
It should leave you with quite small and easy to use classes.

How to make an initial screen to fit every mobile screen or support multiscreens

I am working on an android project. My first screen consists of one imageview and three textviews everything is clearly visible when the mobile positioned vertically if the mobile positioned horizontally then some text views are not visible how to make my app which fits to screen and supports all positions(vertical/horizontal).
Thank you.

You need to add a ScrollView to your layout. As in landscape the screen height is decreased, so lesser area is left to show elements.
ScrollView will manage all the things for you. If space available is less than required then Scroll bar will be shown otherwise not.

If you are sure that it will fit on any screen size, consider using RelativeLayout, with this you can say where it needs to align on the screen at all times. Of course if it can overflow than using a Scrollview is a much safer option.

You can use a scrollview to fit the screen in length, or you can use PercentRelativeLayout.
How to use a scrollview:
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true">
<TableLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:stretchColumns="1">
<--yourcodehere-->
</TableLayout>
</ScrollView>
Add this to your gradle to use PercentRelativeLayout:
compile 'com.android.support:percent:23.2.0'
Then you can use it like this:
<Button
android:text="#string/Tesksten"
android:id="#+id/btContent"
android:layout_below="#+id/searchView"
android:drawableTop="#drawable/ic_menu"
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_heightPercent="16%"
app:layout_widthPercent="100%"
android:padding="10dp"
android:textColor="#000000"
android:background="#f0f0f0"
android:textStyle="bold"
android:alpha="0.65"
android:layout_marginBottom="10dp"/>
This is how this button looks now, note that there are more lines to get MY specific layout, remove if needed. Make sure you put Width And height to 0 and then use Percent, i had some problems figuring it out at first to. Goodluck.:
Or if you want to fully turn off screen rotation, add this to your manifest activity, that you dont want to rotate:
android:screenOrientation="portrait"

What LayoutManager should I use for a RecyclerView to avoid distributing cards evenly?

tl;dr: What do I need to do to get the result from the first image instead of the second one (concerning the blue squares)?
First, the code snippets are at https://gist.github.com/exhuma/125ec8a5e32b395fd786
and an image for reference, representing the intended outcome:
I have an application with 3 RecyclerViews. One "main" list in the center, and two "status views" to the left and right of it. The main list works as intended, and it should be scrollable. The ones to the left and right have cards which will rarely (if ever) fill the whole screen height. Scrolling would be a nice-to-have, but is not necessary. They both represent sort of a "pending queue" of items which will soon appear in the main list, visualised with small icons.
I tried just going about the business in the same way as I did for the central view. But when I did that, it resulted in the cards in the "queue" lists to be evenly spaced like this:
My question is: What LayoutManager does this? Or should I use something else than the RecyclerView instead? Like a ListView?

The solution is to force the cards of the RecyclerView to a fixed size. Replace this:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="#id/statusIcon"
android:maxHeight="10dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
With this:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="#id/statusIcon"
android:layout_width="20dp"
android:layout_height="20dp" />
</LinearLayout>
Obviously, this will not scale with screen sizes. There still might be a better solution. This works for now...

fill_parent in LinearLayout isn't being honored

After much research on both SO and google, I haven't seen any one with exactly the same problem I am experiencing, so here it is:
I recently redid the entire UI on an android app. For the most part, I made only cosmetic changes to each of the screens. They appear in the UI editor of eclipse perfectly as expected. However, directly after doing this, two of the screens stopped being laid out correctly on both all tested devices and the emulator.
Now, the big problem one these two screens was that the root level LinearLayout didn't appear to be actually honoring the fill_parent for either layout_height or layout_width. it looks like it's being measured as if it were set to wrap_content instead. It only takes up about 70% of the screen - which is just enough to wrap the individual elements inside the root LinearLayout. I would post an image, but as a new user, I am not allowed to.
The layout isn't stretching to fill the screen. Here's the code for layout, except that there are a few more in the LinearLayouts containing a TextView and an EditText.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#FF000000"
android:orientation="vertical" >
<TextView
style="#style/sans.white.16.bold"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:paddingTop="4dp"
android:text="#string/edit_account" />
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<com.teamunify.ondeck.widget.TUTextView
style="#style/sans.white.14"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:text="#string/first_name" />
<com.teamunify.ondeck.widget.TUEditText
android:id="#+id/acc_editor_first"
android:layout_width="fill_parent"
android:layout_height="40dp"
android:selectAllOnFocus="true"
android:singleLine="true" />
</LinearLayout>
I think the root LinearLayout should be filling both height and width. I've used this same layout many MANY times in our app without problems. (A quick count revealed that I used 76 LinearLayouts in our app, and all but two of them are working.)
At first, I suspected that perhaps our custom classes measure was wrecking things, so I changed the layout to use all plain EditTexts, but there was no change. I double checked the activity, but it isn't doing anything except to load this xml. So, in desperation, I redid the layout like so:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#FF000000"
android:orientation="vertical" >
<TextView
style="#style/sans.white.16.bold"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center|top"
android:paddingTop="4dp"
android:text="#string/edit_account" />
</LinearLayout>
After that, The words Edit Account appear with a black background mashed into the upper left corner. Clearly, the LinearLayout isn't filling the parent.
Long story short, I am asking how to fix this so that the LinearLayout fills the screen as expected.
I am at a complete loss as to why this is happening, and I am certainly hoping that someone on SO has an idea. This has got me pulling my hair out!

Try setting fixed width and height for the root layout.
Then only you will be able to debug who is driving length and width. It is very much possible that parent activity or background activity is setting dimensions. Once you identify the root cause you can go back to original settings.
As of now from your code snippet given here, nothing wrong here

If you use a custom activity as a container to other activities for some reason (In our case, we were recreating the look of our iOS app, and needed a custom menu to show up along the button side of the screen) the window manager seems to get a bit confused with what the actual height and width of the nested activities should be. A call to fillparent or matchparent ends up wrapping the content instead.
We ended up changing the behavior of several methods in our container activity class to make this work.

What should my Android Layout look like?

I recently asked a question about how to add a view on top of a view, after asking that I realized I needed to added a better layout to my app before proceeding further.
I was reading Android Layout Tricks but noticed it was specifically for text views and image views. I'm looking to do it with two custom views. So I decided to whip up a quick image in paint to hopefully show more clearly of what I'm wanting to do.
This is how I want my layout to split the views. :
This is how it would look with the views drawn. Obviously the purple and blue boundaries would be the background color (greyish). The data above simply displays the y-intercept of the graph drawn with respective color. (So there would be multiple graph views drawn on top of each other)
So my question is, what would my main content view look like? I assume it would have a Linear layout but I'm rather new to these layouts.
EDIT
Using TextViews I'm able to come up with something similar using the following XML:
<?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">
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TextView
android:text="Data Placeholder"
android:background="#733674"
android:textSize="15pt"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="20"/>
<TextView
android:text="Graph Placeholder"
android:background="#374F82"
android:textSize="15pt"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="80"/>
</LinearLayout>
</LinearLayout>
So The only question that really remains is, am I supposed to use TextViews? Meaning in my Activity am I able to add my custom views where these TextViews are? Or am I supposed to add my custom view to the XML?
Ie.
<DataView
android:text="Data Placeholder"
android:background="#733674"
android:textSize="15pt"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="20"/>
<GraphView
android:text="Graph Placeholder"
android:background="#374F82"
android:textSize="15pt"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="80"/>
My custom views are written in Java and I'm not sure how I would let the layout know where the views are located if I was to do it this way.

Try this: http://developer.android.com/resources/tutorials/views/hello-linearlayout.html
It has some very useful information which might help you out in regards to layout_weight as Michell Bak mentioned in the comment.
And here's the page for the Hello Views:
http://developer.android.com/resources/tutorials/views/index.html
Not to be rude, but it would be much better for you to peruse these and learn the xml on your own. That way you can actually understand it and be better able to re-create it later.
I was quite overwhelmed at first with all the code I didn't understand (including xml files), but with a little practice it becomes very easy - just time consuming.
The main thing I'm confused about is what kind of View to put in the
layout. In the examples they use TextView or ImageView, but mine is a
custom view
Well, for your "Custom Data View", you would use a LinearLayout with android:layout_width="fill_parent" and android:layout_height="fill_parent" and android:layout_weight="1" and android:background="#BA4AAB" (See http://www.colorpicker.com/)
Then for your Custom Graph View, I would use:
android:layout_width="fill_parent" android:layout_height="fill_parent" android:layout_weight="4" android:background="#7D4ABA"
Note the layout_weight and background values I put are kind of guesses, you might have to tweak them some to match what you want.
The two linearlayouts that I mentioned would be inside one larger LinearLayout with android:orientation="vertical"
Then for the data in the top, you would use 4 text Views, and in code, you'd use setText(...) on those text views to put your data in.
In the xml for textview1, you would add android:id="#+id/textview1" then in code add TextView textview1 = (TextView)findviewbyId(R.id.textview1); then textview1.setText(myString);
For the graph in the bottom part, you would use 2 views for the base of the graph, and set there android:layout_width and android:layout_height to whatever suits you using dip, dp, or px units.
For the lines that you draw, I believe you would have to use the canvas class with a bitmap and call canvas.drawLine(...) (see http://developer.android.com/reference/android/graphics/Canvas.html)