Android code puzzlers + tips & tricks

The Dutch Android User Group http://www.dutchaug.org

Android Code Puzzlers

Can you solve all our challenges?NLJUG JFall

Wednesday November 6th

!Johan Pelgrim & Hugo Visser

+TIPS & TRICKS


• Android Developer!

• Working at VX Company http://www.vxcompany.com!

• Organizer The Dutch Android User Group!

• Written Android articles and recipes for http://www.androidcookbook.com

Johan Pelgrim @jowipe


• Android Developer!

• Working at Qbushttp://www.qbus-ict.nl!

• Organizer The Dutch Android User Group!

• Developer of Rainy Days and Figure Running and ...

Hugo Visser @botteaap


• Open Group - Dutch Focus & Spread - Free to join!!

• Monthly meetups http://www.dutchaug.org !

• Started nov 2011 (at droidconNL)!

• Foundation since feb 2013!

• We are a Google Developer Group (GDG)!

• @dutchaug #dutchaug!

• The Dutch Android User Group

DutchAUG

http://www.dutchaug.org


DutchAUG

Wiebe Elsinga!

Itude Mobile

Dennis Geurts!Luminis

Hugo Visser!Qbus

Johan Pelgrim!

VX Company


DutchAUG Main sponsor

http://www.nspyre.nl/android


DutchAUG Main sponsor

http://www.vxcompany.com



DutchAUG Upcoming meetup

Android 4.4 KitKat

& Play Services 4

January

Utrecht


Android Code PuzzlersCan you solve all our challenges?

• We present a puzzle

• You chew on it for a while

• If you know the answer(and more importantly...why) you win!


Everybody Ready?


Layout puzzleWhich picture matches this layout:!<?xml version="1.0" encoding="utf-8"?>!<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"! android:layout_width="fill_parent"! android:layout_height="fill_parent" >! <TextView! android:layout_height="wrap_content"! android:layout_width="fill_parent"! android:text="Layout Puzzle 1"! android:layout_gravity="center"! android:gravity="center_vertical" />!</RelativeLayout>!!A) B) C)!

puzzle


Layout puzzle puzzleWhich picture matches this layout:!<?xml version="1.0" encoding="utf-8"?>!<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"! android:layout_width="fill_parent"! android:layout_height="fill_parent" >! <TextView! android:layout_height="wrap_content"! android:layout_width="fill_parent"! android:text="Layout Puzzle 1"! android:layout_gravity="center"! android:gravity="center_vertical" />!</RelativeLayout>!!A) B) C)!


You Only Frag TwiceSingle activity, with a single fragment!!

Activity:!protected void onCreate(Bundle savedInstanceState) {! super.onCreate(savedInstanceState);! setContentView(R.layout.single_fragment);! if (savedInstanceState == null) {! getFragmentManager().beginTransaction().add(R.id.single_fragment, ! new YouOnlyFragTwiceFragment());! }!}!!single_fragment.xml:!<?xml version="1.0" encoding="utf-8"?>!<merge>!<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"! android:id="@+id/single_fragment"! android:layout_width="fill_parent"! android:layout_height="fill_parent" />!</merge>!!What happens when the Activity is started?!A) Fragment is shown and filling the screen!B) Activity crashes!C) Nothing is shown

puzzle


You Only Frag TwiceSingle activity, with a single fragment!!

Activity:!protected void onCreate(Bundle savedInstanceState) {! super.onCreate(savedInstanceState);! setContentView(R.layout.single_fragment);! if (savedInstanceState == null) {! getFragmentManager().beginTransaction().add(R.id.single_fragment, ! new YouOnlyFragTwiceFragment());! }!}!!single_fragment.xml:!<?xml version="1.0" encoding="utf-8"?>!<merge>!<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"! android:id="@+id/single_fragment"! android:layout_width="fill_parent"! android:layout_height="fill_parent" />!</merge>!!What happens when the Activity is started?!A) Fragment is shown and filling the screen!B) Activity crashes!C) Nothing is shown

puzzle

C) Nothing is shown

.commit();


License to clickFragment layout:!<Button android:text="Don't click me!"! android:layout_centerInParent="true"! android:onClick="clicked" />!!In activity:!public void clicked(View v) {! Toast.makeText(this, "onClick from activity", 1).show();!}!!!In fragment:!public void clicked(View v) {! Toast.makeText(getActivity(), "onClick from fragment", 1).show();!}!!What happens when I tap the button?!A) Toast “onClick from activity” is shown!B) Toast “onClick from fragment” is shown!C) First “onClick from activity” then “onClick from fragment” is shown!D) First “onClick from fragment” then “onClick from activity” is shown!

puzzle


License to clickFragment layout:!<Button android:text="Don't click me!"! android:layout_centerInParent="true"! android:onClick="clicked" />!!In activity:!public void clicked(View v) {! Toast.makeText(this, "onClick from activity", 1).show();!}!!!In fragment:!public void clicked(View v) {! Toast.makeText(getActivity(), "onClick from fragment", 1).show();!}!!What happens when I tap the button?!A) Toast “onClick from activity” is shown!B) Toast “onClick from fragment” is shown!C) First “onClick from activity” then “onClick from fragment” is shown!D) First “onClick from fragment” then “onClick from activity” is shown!

puzzle

A) Toast “onClick from activity” is shown


A view to a killpuzzle

public class GetViewActivity extends Activity {!!! !! @Override!! protected void onCreate(Bundle savedInstanceState) {!! ! super.onCreate(savedInstanceState);!! ! setContentView(R.layout.view_to_a_kill);!! ! !! ! getFragmentManager().beginTransaction()!! ! ! .replace(R.id.content, new GetViewFragment())!! ! ! .commit();!! }!! !! !}!



What happens when the Activity is started?!A) Shows a Toast “my name is droid, android”!B) does nothing but showing a view!C) Exception in Inflater.inflate()!D) Exception in GetViewFragment.onCreate()!E) Exception in Fragment.onCreateView()

public class GetViewFragment extends Fragment {!!! @Override! public void onCreate(Bundle savedInstanceState) {!! ! super.onCreate(savedInstanceState);!!! ! getView().setOnClickListener(new View.OnClickListener() {!! ! ! @Override! public void onClick(View v) {!! ! ! ! Toast.makeText(getActivity(), "My name is droid, android", 1);!! ! ! }!! ! });!! }!!! @Override! public View onCreateView(LayoutInflater inf, ViewGroup view, Bundle saved) {!! ! return inf.inflate(R.layout.fragment_get_view, view);!! }!!}!




D) Exception in GetViewFragment.onCreate()





D) Exception in GetViewFragment.onCreate()



TIPAlpha / Beta builds


Live And Let Diepublic class ToastFragment extends Fragment {! ...! public void onDestroy() {! super.onDestroy();! new ToastingAsyncTask().execute(null,null,null);! }!! class ToastingAsyncTask extends AsyncTask<String, Integer, Long>{! protected Long doInBackground(String... params) {! try {Thread.sleep(500);} catch (InterruptedException e) {}! return null;! }! protected void onPostExecute(Long result) {! if (getActivity() == null){! System.out.println(getString(R.string.no_activity));! }else{! System.out.println(getString(R.string.activity_leak));! } ! }! } !! what happens when I change the orientation?! A) Sysout: no_activity! B) Sysout: activity_leak! C) Sysout: null! D) Exception in getActivity ! E) Exception in getString

puzzle



puzzle

E) Exception in getString...



puzzle

LogCat:

java.lang.IllegalStateException: Fragment ToastFragment not attached to

Activity!!A Context holds your Resources!!!Know about the life cycle of Activities, Fragments, Services!!!And...!

!“Use the source Luke!”!

https://android.googlesource.com/platform/frameworks/base/+/refs/heads/master/core/java/android/app/Fragment.java


Live And Let Die

!public class Fragment ...!!public final String getString(int resId) {! return getResources().getString(resId);!}!!final public Resources getResources() {! if (mActivity == null) {! throw new IllegalStateException("Fragment " + this + ! " not attached to Activity");! }! return mActivity.getResources();!}!!

puzzle


From Fragment with love

public class ActionbarFragment extends Fragment {!...! public View onCreateView(LayoutInflater inf, ViewGroup view, Bundle saved) {! setHasOptionsMenu(true);! return inf.inflate(R.layout.fragment_get_view, null);! }! public boolean onOptionsItemSelected(MenuItem item) {! Toast.makeText(getActivity(), "from Fragment", 1).show();! return true;! } !}!!public class ActionbarActivity extends Activity {!...! public boolean onOptionsItemSelected(MenuItem item) {! Toast.makeText(this, "from Activity", 1).show();! return true;! } !}!!When clicking an ActionBar item: !a) Shows toast “from Activity”!b) Shows toast “from Fragment”!c) Shows both toasts!d) Shows toast depending on who created the menu item

puzzle


From Fragment with love

public class ActionbarFragment extends Fragment {!...! public View onCreateView(LayoutInflater inf, ViewGroup view, Bundle saved) {! setHasOptionsMenu(true);! return inf.inflate(R.layout.fragment_get_view, null);! }! public boolean onOptionsItemSelected(MenuItem item) {! Toast.makeText(getActivity(), "from Fragment", 1).show();! return true;! } !}!!public class ActionbarActivity extends Activity {!...! public boolean onOptionsItemSelected(MenuItem item) {! Toast.makeText(this, "from Activity", 1).show();! return true;! } !}!!When clicking an ActionBar item: !a) Shows toast “from Activity”!b) Shows toast “from Fragment”!c) Shows both toasts!d) Shows toast depending on who created the menu itemA) Shows toast “from Activity”

puzzle


Support Library

• Fragment / ListFragment / DialogFragment!

• ViewPager!

• LoaderManager / CursorLoader!

• Many many compat classes!

• LruCache / SparseArray!

• Navigation Drawer (DrawerLayout)

Development

tips & tricks


Google Play Services

• Google Maps v2!

• Geofencing!

• Google+ Sign-in!

• Activity Recognition!

• Google Cloud Messaging!

• And more...

Development

tips & tricks


Casino Royalpublic class AsyncTaskActivity extends Activity{!...!protected void onResume() {! super.onResume();! TextView testV = (TextView) findViewById(R.id.async_text_1);! new WritingAsyncTask(testV,2000).execute("Bob");! new WritingAsyncTask(testV,500).execute("loves");! new WritingAsyncTask(testV,100).execute("Alice");!} ...!!public class WritingAsyncTask extends AsyncTask<String, Void, String> {...! private final TextView view; //set in Constructor! private final int timeout; //set in Constructor! protected String doInBackground(String... params) {! try {Thread.sleep(timeout);} catch (InterruptedException e) {}! return params[0];! }! protected void onPostExecute(String result) {! view.setText(view.getText()+" "+result);! }!}!!What is shown in the TextView when I start the Activity on my Galaxy Nexus: !a) Alice loves Bob!b) Bob Alice loves!c) Bob loves Alice!d) There is not enough information to decide

puzzle


Casino Royalpublic class AsyncTaskActivity extends Activity{!...!protected void onResume() {! super.onResume();! TextView testV = (TextView) findViewById(R.id.async_text_1);! new WritingAsyncTask(testV,2000).execute("Bob");! new WritingAsyncTask(testV,500).execute("loves");! new WritingAsyncTask(testV,100).execute("Alice");!} ...!!public class WritingAsyncTask extends AsyncTask<String, Void, String> {...! private final TextView view; //set in Constructor! private final int timeout; //set in Constructor! protected String doInBackground(String... params) {! try {Thread.sleep(timeout);} catch (InterruptedException e) {}! return params[0];! }! protected void onPostExecute(String result) {! view.setText(view.getText()+" "+result);! }!}!!What is shown in the TextView when I start the Activity on my Galaxy Nexus: !a) Alice loves Bob!b) Bob Alice loves!c) Bob loves Alice!d) There is not enough information to decideD) There is not enough information to decide...

puzzle


Casino Royal

!You need to know the targetSdkVersion and the device OS version of the target device!!android:targetSdkVersion < 13: parallel execution!!android:targetSdkVersion >= 13 ! && Device OS >= 14: serial execution!!!This is what we see in AsyncTask.Java:!!public static final Executor SERIAL_EXECUTOR = new SerialExecutor(); !private static volatile Executor sDefaultExecutor = SERIAL_EXECUTOR;!!!You are in control of the type of execution in SDK >= 11!!executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR,…);!!

puzzle

D) There is not enough information to decide...


Development

tips & tricks

Casino Royal

android:minSdkVersion=“14”!!Go for minSdkVersion=“14” (Android 4.0 / Ice Cream Sandwich)!Second best minSdkVersion = “10” (Android 2.3.3 / Gingerbread)!E.g. Google Play Services new API’s > 10!Don’t do anything lower than 10!!android:targetSdkVersion=“19”!!Always set this to the latest Android API level!!!android:maxSdkVersion!!Don’t use this. Everything is backwards compatible by default.!!!


Custom ViewsView:!

public class MyCustomView extends LinearLayout {! public MyCustomView(Context context, AttributeSet attrs) {! super(context, attrs);! LayoutInflater.from(context).inflate(R.layout.component, this, true);! // more stuff here! }!}!!component.xml!<?xml version="1.0" encoding="utf-8"?>!<LinearLayout ... >! <TextView android:id="@+id/label” ... />! <EditText android:id="@+id/value” ... />!</LinearLayout>!!layout.xml!<LinearLayout android:orientation="vertical">! <org.dutchaug.androidpuzzlers.customviewmess.MyCustomView/>! <org.dutchaug.androidpuzzlers.customviewmess.MyCustomView/>! <org.dutchaug.androidpuzzlers.customviewmess.MyCustomView/>!</LinearLayout>!!When you inflate layout.xml in an Activity: !a) Everything works fine!b) Exception on inflating the XML!c) Everything appears to look fine, but there are subtle bugs!d) The app crashes when entering text in the first EditText!!Hint: How does the view tree look when the layout is inflated?!

puzzle


Custom ViewsView:!

public class MyCustomView extends LinearLayout {! public MyCustomView(Context context, AttributeSet attrs) {! super(context, attrs);! LayoutInflater.from(context).inflate(R.layout.component, this, true);! // more stuff here! }!}!!component.xml!<?xml version="1.0" encoding="utf-8"?>!<LinearLayout ... >! <TextView android:id="@+id/label” ... />! <EditText android:id="@+id/value” ... />!</LinearLayout>!!layout.xml!<LinearLayout android:orientation="vertical">! <org.dutchaug.androidpuzzlers.customviewmess.MyCustomView/>! <org.dutchaug.androidpuzzlers.customviewmess.MyCustomView/>! <org.dutchaug.androidpuzzlers.customviewmess.MyCustomView/>!</LinearLayout>!!When you inflate layout.xml in an Activity: !a) Everything works fine!b) Exception on inflating the XML!c) Everything appears to look fine, but there are subtle bugs!d) The app crashes when entering text in the first EditText!!Hint: How does the view tree look when the layout is inflated?!

C) Everything appears to look fine, but there! are subtle bugs

puzzle


Custom ViewsAfter inflate:!!<LinearLayout>!<LinearLayout ... >! <TextView android:id="@+id/label" ... />! <EditText android:id="@+id/value" ... />!</LinearLayout>!<LinearLayout ...>! <TextView android:id="@+id/label" ... />! <EditText android:id="@+id/value" ... />!</LinearLayout>!<LinearLayout ...>! <TextView android:id="@+id/label" ... />! <EditText android:id="@+id/value" ... />!</LinearLayout>!</LinearLayout>!!Oops:!!1.OnSaveInstanceState is called in LinearLayout !2.LinearLayout calls saveHierarchyState(SparseArray<Parcelable> state) on children!3.Child returns Parcelable which is put in the state and keyed on the view id!4.When state is restored, there is a single value for label, and a single value for value.!!

puzzle


@Override!protected void onStart() {!! super.onStart();!! ! !! String[] longList = new String[1000000];!! Intent intent = new Intent(Intent.ACTION_SEND);!! intent.setType("text/plain");!! intent.putExtra("dutchaug", longList);!! startActivityForResult(intent, 100);!!}!!!What happens when the activity is started?!A) OutOfMemoryException in onCreate() B) IllegalArgumentException in onCreate() C) Nothing happens, direct invocation of onActivityResult (with cancel code) D) Nothing happens, no invocation of onActivityResult E) System-Intent-Picker for "sent" action will be shown normally

puzzleThe World Is Not Enough


@Override!protected void onStart() {!! super.onStart();!! ! !! String[] longList = new String[1000000];!! Intent intent = new Intent(Intent.ACTION_SEND);!! intent.setType("text/plain");!! intent.putExtra("dutchaug", longList);!! startActivityForResult(intent, 100);!!}!!!What happens when the activity is started?!A) OutOfMemoryException in onCreate() B) IllegalArgumentException in onCreate() C) Nothing happens, direct invocation of onActivityResult (with cancel code) D) Nothing happens, no invocation of onActivityResult E) System-Intent-Picker for "sent" action will be shown normally


D) Nothing happens, no invocation of onActivityResult...


Logcat shows:!26-02 17:25:53.391: E/JavaBinder(6247): !!! FAILED BINDER TRANSACTION !!!!!The Binder transaction failed because it was too large.!!During a remote procedure call, the arguments and the return value of the call are transferred as Parcel objects stored in the Binder transaction buffer. If the arguments or the return value are too large to fit in the transaction buffer, then the call will fail and TransactionTooLargeException will be thrown.!!The Binder transaction buffer has a limited fixed size (1Mb) which is shared by all transactions in progress for the process. Consequently this exception can be thrown when there are many transactions in progress even when most of the individual transactions are of moderate size.!



But some more:No more puzzles...


compound drawable

<RelativeLayout ...>!! <LinearLayout ...>! <ImageView! android:layout_marginRight="15dp"! android:layout_width="wrap_content"! android:layout_height="wrap_content"! android:src="@drawable/dutchaug" />!! <TextView! android:layout_width="wrap_content"! android:layout_height="wrap_content"! android:text="DutchAUG" />! </LinearLayout>!! !! <TextView! android:drawableLeft="@drawable/dutchaug"! android:drawablePadding="15dp"! android:layout_width="wrap_content"! android:layout_height="wrap_content"! android:text="DutchAUG" />!!</RelativeLayout>!

Development

tips & tricks

DutchAUG


Level list drawableDevelopment

tips & tricks

!Somewhere in a BaseAdapter far, far away...!! if (error) {! Drawable d = getContext().getResources().getDrawable(R.drawable.error);! mTextView.setCompoundDrawablesWithIntrinsicBounds(d, null, null, null)! } else {! Drawable d = getContext().getResources().getDrawable(R.drawable.ok);! mTextView.setCompoundDrawablesWithIntrinsicBounds(d, null, null, null) ! }!

• Drawables have setLevel() 0...10000!

• Assign drawable level range


Level list drawable:!!<level-list xmlns:android="http://schemas.android.com/apk/res/android">! <item android:maxLevel="0" android:drawable="@drawable/ic_state_ok" />! <item android:maxLevel="1" android:drawable="@drawable/ic_state_error" /> ! !</level-list>!!BetterAdapter.java!!// Constants please!!private static final int LEVEL_OK = 0;!private static final int LEVEL_ERROR = 1;!!if (error) {! mTextView.getCompoundDrawables()[0].setLevel(LEVEL_ERROR)!} else {! mTextView.getCompoundDrawables()[0].setLevel(LEVEL_OK)!}!!Or less verbose:! !mTextView.getCompoundDrawables()[0].setLevel(error ? LEVEL_ERROR : LEVEL_OK)!!

Development

tips & tricks

Level list drawable


android.text.format.DateUtilsDevelopment

tips & tricks

•CharSequence getRelativeTimeSpanString (long time, long now, long minResolution)!

•now – System.currentTimeMillis()!

•minResolution – e.g. SECOND_IN_MILLIS so the smallest unit of time will be seconds.!

•English example: “2 seconds ago”!

•Or in German: “Vor 2 Sekunden”

android.text.TextUtils

•boolean isDigitsOnly(CharSequence str)!

•boolean isEmpty(CharSequence str)!

•String htmlEncode(String s)!

•CharSequence commaEllipsize(...)!

•CharSequence ellipsize(...)

Development

tips & tricks


fromHTML

TextView view = (TextView)findViewById(R.id.sampleText);!String formattedText = getString(R.string.htmlFormattedText);!Spanned result = Html.fromHtml(formattedText);!view.setText(result);

<string name="htmlFormattedText">! <![CDATA[! <p>Text with markup for! <strong>bold</strong>! and <em>italic</em> text.</p>! <p>There is also support for a ! <tt>monospaced</tt>font. ! But no use for the ! <code>code</code> tag!</p>! ]]>!</string>

Development

tips & tricks


Annotation Processors

• @InjectView (Butter Knife) http://jakewharton.github.io/butterknife/!

• @Frozen @Argumenthttps://bitbucket.org/hvisser/bundles!

• Android Annotationshttp://androidannotations.org

Development

tips & tricks


Annotation ProcessorsDevelopment

tips & tricks public class MainActivityBefore extends Activity {!! int mLoginCount;! String mCurrentUser;! long mSessionExpiresAt;!! @Override! protected void onCreate(Bundle savedInstanceState) {! super.onCreate(savedInstanceState);! setContentView(R.layout.activity_main);!! if (savedInstanceState != null) {! mLoginCount = savedInstanceState.getInt("login_count");! mCurrentUser = savedInstanceState.getString("user");! mSessionExpiresAt = savedInstanceState.getLong("session_expire");!! DemoBeforeFragment fragment = new DemoBeforeFragment();! Bundle args = new Bundle();! args.putString("greeting", "Hello!");! fragment.setArguments(args);!! getFragmentManager().beginTransaction().add(R.id.main_fragment, fragment).commit();! }!! }!! @Override! protected void onSaveInstanceState(Bundle outState) {! super.onSaveInstanceState(outState);! outState.putInt("login_count", mLoginCount);! outState.putString("user", mCurrentUser);! // something is not quite right here...! outState.putLong("session_expre", mSessionExpiresAt);! }!}!



tips & tricks public class DemoBeforeFragment extends Fragment {! TextView mTextView;! Button mLoginButton;!! String mGreeting;! int mVisitCount = 0;!! @Override! public void onCreate(Bundle savedInstanceState) {! super.onCreate(savedInstanceState);! mGreeting = getArguments().getString("greeting");! mVisitCount = getArguments().getInt("visit_count", 0);! }!! @Override! public View onCreateView(LayoutInflater inflater, ViewGroup container, ! Bundle savedInstanceState) {! View view = inflater.inflate(R.layout.activity_main, container, false);! mTextView = (TextView) view.findViewById(R.id.greeting);! mLoginButton = (Button) view.findViewById(R.id.login);! mTextView.setText(mGreeting);! return view;! }!}



tips & tricks public class MainActivityAfter extends Activity {!! @Frozen int mLoginCount;! @Frozen String mCurrentUser;! @Frozen long mSessionExpiresAt;!! @Override! protected void onCreate(Bundle savedInstanceState) {! super.onCreate(savedInstanceState);! setContentView(R.layout.activity_main);! MainActivityAfterState.restoreInstanceState(this, savedInstanceState);! if (savedInstanceState != null) {! Fragment fragment = DemoAfterFragmentBuilder.newDemoAfterFragment("Hello");! getFragmentManager().beginTransaction().add(R.id.main_fragment,! fragment).commit();! }! }!! @Override! protected void onSaveInstanceState(Bundle outState) {! super.onSaveInstanceState(outState);! MainActivityAfterState.saveInstanceState(this, outState);! }!}



tips & tricks public class DemoAfterFragment extends Fragment {! @InjectView(R.id.greeting) TextView mTextView;! @InjectView(R.id.login) Button mLoginButton;!! @Argument String mGreeting;! @Argument(required=false) int mVisitCount = 0;!! @Override! public void onCreate(Bundle savedInstanceState) {! super.onCreate(savedInstanceState);! DemoAfterFragmentBuilder.injectArguments(this);! }!! @Override! public View onCreateView(LayoutInflater inflater, ViewGroup container, ! Bundle savedInstanceState) {! View view = inflater.inflate(R.layout.activity_main, container, false);!! Views.inject(this, view);!! mTextView = (TextView) view.findViewById(R.id.greeting);! mLoginButton = (Button) view.findViewById(R.id.login);! mTextView.setText(mGreeting);! return view;! }!}


• Code optimalizations E.g. Log.d has no side effects!

• Code reduction Unused methods / classes!

• Code obfuscation (secure?) DexGuard does a better job!

Proguard

Watch Eric LaFortune on http://youtube.com/dutchaug


Use Lint

• From Eclipse!

• lint <project dir>!

• Jenkins lint plugin

Development

tips & tricks


Jenkins

Watch Christopher Orr on http://youtube.com/dutchaug

• Automate Android build, test and deploy E.g. use Jenkins build number in your AndroidManifest!

• “There’s a plug-in for that!”


THE END

Thanks for your participation!

Get the puzzle code

http://bit.ly/android-puzzlers

Technology

Android code puzzlers + tips & tricks