user8940: I like chess puzzle apps. But they all focus on the end or middle game.
The reason is clear: In the opening there is no single truth.
But there is some common sense what's good and what's not.
Is there an android app which help me train the best opening moves?
I found some apps for openings, but they work like this: First you need to choose the name of the opening, then you train.
I don't care for the names. 
I want to see a chess board and then it is my turn to do the next move. 
I don't want to choose a particular opening first.

user9030: GM Nigel Davies has a training DVD on opening tricks&traps, I'm sure you will like it. 
http://en.chessbase.com/post/nigel-davies-tricks-traps-vol-1
Also, in lichess.org, there are quizzes for finding good development moves in openings, I recommend you to take a look. 
By the way, lichess.org can be used by it's Android application, if you don't want to use it from website.

user8940: I found an other way to solve my question:
The android app DroidFish can show the recommended opening moves.
You can add a custom button to the GUI to show/hide the recommended opening moves from the book.
It is not like a real puzzle, but similar.

user5653: I don't know about an app for this, but I think you'll love this book: Modern Chess Self Instructor Book 1 by Victor Pozharsky
It's a puzzle book which is based on opening moves.

8940: <p>I like chess puzzle apps. But they all focus on the end or middle game.</p>

<p>The reason is clear: In the opening there is no single truth.</p>

<p>But there is some common sense what's good and what's not.</p>

<p>Is there an android app which help me train the best opening moves?</p>

<p>I found some apps for openings, but they work like this: First you need to choose the name of the opening, then you train.</p>

<p>I don't care for the names. </p>

<p>I want to see a chess board and then it is my turn to do the next move. </p>

<p>I don't want to choose a particular opening first.</p>
 9030: <p>GM Nigel Davies has a training DVD on opening tricks&amp;traps, I'm sure you will like it. </p>

<p><a href="http://en.chessbase.com/post/nigel-davies-tricks-traps-vol-1" rel="nofollow">http://en.chessbase.com/post/nigel-davies-tricks-traps-vol-1</a></p>

<p>Also, in lichess.org, there are quizzes for finding good development moves in openings, I recommend you to take a look. </p>

<p>By the way, lichess.org can be used by it's <a href="https://play.google.com/store/apps/details?id=org.lichess.mobileapp&amp;hl=tr" rel="nofollow">Android application</a>, if you don't want to use it from website.</p>
 8940: <p>I found an other way to solve my question:</p>

<p>The android app DroidFish can show the recommended opening moves.</p>

<p>You can add a custom button to the GUI to show/hide the recommended opening moves from the book.</p>

<p>It is not like a real puzzle, but similar.</p>
 5653: <p>I don't know about an app for this, but I think you'll love this book: <strong>Modern Chess Self Instructor Book 1</strong> by <em>Victor Pozharsky</em>
It's a puzzle book which is based on opening moves.</p>
