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Building UI Consistent Android Apps Nicola Corti @cortinico [email protected]

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Yelp Mission Connecting people with great local businesses.

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About me Nicola Corti Android Dev [email protected] @cortinico !✈

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What is Consistency?

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“Unified use of Design Elements, such as color, typography, spatial layout and behaviors.

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Functional Internal Consistency Visual

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External Consistency - Across Product

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External Consistency - Across Platform

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Benefits • Learnability • Reduce frustrations • Save money/time Photo by davelawler/CC BY - NC

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How to tackle Consistency?

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⌘ R ⇧ + +

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Source: GIPHY

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External Examples • Google Material Design • Apple Design Guidelines • Github Primer http://styleguides.io/

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github.com/alexpate/awesome-design-systems

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Consistency @Yelp

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Mobile Apps

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yelp.com/styleguide

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The Android Styleguide Library

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Design Build Share

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Design

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Does it fit? • Can be reused? • Is it visible to the user? • Development plan?

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User photo User name timestamp friends, media checkins Elite badge description

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Attributes 


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Attributes 
 
 


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Attributes 
 
 
 
 


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Attributes 
 
 
 
 
 
 
 


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Attributes 
 
 
 
 
 
 
 
 


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Theme

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Theme 
 
 
 </resources>

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Theme 
 
 
 </resources>

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Theme 
 
 
 <item name="userPassportStyle">@style/UserPassport</item>
 


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Styles

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Styles

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Styles 
 <item name="userPassportName">Joe Smith</item>


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Styles 
 <item name="userPassportName">Joe Smith</item>
 <item name="userPassportDescription">Owner of Sample Business</item>


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UserPassport

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public class UserPassport extends RelativeLayout {


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public class UserPassport extends RelativeLayout {
 
 private TextView mUserName;
 private TextView mDescription;


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public class UserPassport extends RelativeLayout {
 
 private TextView mUserName;
 private TextView mDescription;
 
 public void setName(String name) {
 mUserName.setText(name);
 }
 
 


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public class UserPassport extends RelativeLayout {
 
 private TextView mUserName;
 private TextView mDescription;
 
 public void setName(String name) {
 mUserName.setText(name);
 }
 
 public void setDescription(String description) {
 if (TextUtils.isEmpty(description)) {
 mDescription.setVisibility(GONE);
 } else {
 mDescription.setVisibility(VISIBLE);
 mDescription.setText(description);
 }
 }
 


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public class UserPassport extends RelativeLayout {
 
 private TextView mUserName;
 private TextView mDescription;


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public class UserPassport extends RelativeLayout {
 
 private TextView mUserName;
 private TextView mDescription;
 
 public UserPassport(final Context context) {
 super(context);
 init(context, null, 0);
 }
 
 public UserPassport(final Context context, final AttributeSet attrs) {
 super(context, attrs);
 init(context, attrs, R.attr.userPassportStyle);
 }
 
 public UserPassport(final Context context, final AttributeSet attrs, final int defStyleAttr) {
 super(context, attrs, defStyleAttr);
 init(context, attrs, defStyleAttr);
 }

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public class UserPassport extends RelativeLayout {
 
 private TextView mUserName;
 private TextView mDescription;
 
 public UserPassport(final Context context) {
 super(context);
 init(context, null, 0);
 }
 
 public UserPassport(final Context context, final AttributeSet attrs) {
 super(context, attrs);
 init(context, attrs, R.attr.userPassportStyle);
 }
 
 public UserPassport(final Context context, final AttributeSet attrs, final int defStyleAttr) {
 super(context, attrs, defStyleAttr);
 init(context, attrs, defStyleAttr);
 }

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public class UserPassport extends RelativeLayout {
 
 private TextView mUserName;
 private TextView mDescription;
 
 private void init(
 final Context context, final AttributeSet attrs, final int defStyleAttr) { 
 }
 


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public class UserPassport extends RelativeLayout {
 
 private TextView mUserName;
 private TextView mDescription;
 
 private void init(
 final Context context, final AttributeSet attrs, final int defStyleAttr) { 
 LayoutInflater.from(context).inflate(R.layout.user_passport, this, true); 
 }
 


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public class UserPassport extends RelativeLayout {
 
 private TextView mUserName;
 private TextView mDescription;
 
 private void init(
 final Context context, final AttributeSet attrs, final int defStyleAttr) { 
 LayoutInflater.from(context).inflate(R.layout.user_passport, this, true); 
 mUserName = (TextView) findViewById(R.id.user_name);
 mDescription = (TextView) findViewById(R.id.description);
 
 }
 


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public class UserPassport extends RelativeLayout {
 
 private TextView mUserName;
 private TextView mDescription;
 
 private void init(
 final Context context, final AttributeSet attrs, final int defStyleAttr) { 
 LayoutInflater.from(context).inflate(R.layout.user_passport, this, true); 
 mUserName = (TextView) findViewById(R.id.user_name);
 mDescription = (TextView) findViewById(R.id.description);
 
 final TypedArray styles = context.obtainStyledAttributes(attrs, R.styleable.UserPassport, defStyleAttr, 0);
 
 }


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public class UserPassport extends RelativeLayout {
 
 private TextView mUserName;
 private TextView mDescription;
 
 private void init(
 final Context context, final AttributeSet attrs, final int defStyleAttr) { 
 LayoutInflater.from(context).inflate(R.layout.user_passport, this, true); 
 mUserName = (TextView) findViewById(R.id.user_name);
 mDescription = (TextView) findViewById(R.id.description);
 
 final TypedArray styles = context.obtainStyledAttributes(attrs, R.styleable.UserPassport, defStyleAttr, 0);
 
 setName(styles.getString(R.styleable.UserPassport_userPassportName)); setDescription(styles.getString( R.styleable.UserPassport_userPassportDescription));
 
 }
 


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public class UserPassport extends RelativeLayout {
 
 private TextView mUserName;
 private TextView mDescription;
 
 private void init(
 final Context context, final AttributeSet attrs, final int defStyleAttr) { 
 LayoutInflater.from(context).inflate(R.layout.user_passport, this, true); 
 mUserName = (TextView) findViewById(R.id.user_name);
 mDescription = (TextView) findViewById(R.id.description);
 
 final TypedArray styles = context.obtainStyledAttributes(attrs, R.styleable.UserPassport, defStyleAttr, 0);
 
 setName(styles.getString(R.styleable.UserPassport_userPassportName)); setDescription(styles.getString( R.styleable.UserPassport_userPassportDescription));
 
 styles.recycle();
 }
 


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 <item name="userPassportName">Joe Smith</item>
 <item name="userPassportDescription">@null</item>
 <item name="userPassportTint">@color/orange_dark_interface</item>
 <item name="userPassportNameColor">@color/black_regular_interface</item>
 <item name="userPassportSize">Regular</item>
 <item name="userPassportShowName">true</item>
 <item name="userPassportShowIcons">true</item>
 <item name="userPassportEliteYear">-1</item>
 <item name="userPassportFriends">0</item>
 <item name="userPassportReviews">0</item>
 <item name="userPassportPhotos">0</item>
 <item name="userPassportCheckIns">0</item>
 <item name="userPassportShowCheckIn">false</item>


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 <item name="userPassportName">Joe Smith</item>
 <item name="userPassportDescription">@null</item>
 <item name="userPassportTint">@color/orange_dark_interface</item>
 <item name="userPassportNameColor">@color/black_regular_interface</item>
 <item name="userPassportSize">Regular</item>
 <item name="userPassportShowName">true</item>
 <item name="userPassportShowIcons">true</item>
 <item name="userPassportEliteYear">-1</item>
 <item name="userPassportFriends">0</item>
 <item name="userPassportReviews">0</item>
 <item name="userPassportPhotos">0</item>
 <item name="userPassportCheckIns">0</item>
 <item name="userPassportShowCheckIn">false</item>


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 <item name="userPassportName">Joe Smith</item>
 <item name="userPassportDescription">@null</item>
 <item name="userPassportTint">@color/white_interface</item>
 <item name="userPassportNameColor">@color/white_interface</item>
 <item name="userPassportSize">Regular</item>
 <item name="userPassportShowName">true</item>
 <item name="userPassportShowIcons">true</item>
 <item name="userPassportEliteYear">-1</item>
 <item name="userPassportFriends">0</item>
 <item name="userPassportReviews">0</item>
 <item name="userPassportPhotos">0</item>
 <item name="userPassportCheckIns">0</item>
 <item name="userPassportShowCheckIn">false</item>


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 <item name="userPassportTint">@color/white_interface</item>
 <item name="userPassportNameColor">@color/white_interface</item>


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isInEditMode()

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isInEditMode() public void setMediaCount(int photo, int video, int media) {
 
 }

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isInEditMode() public void setMediaCount(int photo, int video, int media) {
 mMediaCount.setText(String.valueOf(media));
 }

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isInEditMode() public void setMediaCount(int photo, int video, int media) {
 mMediaCount.setText(String.valueOf(media));
 Resources resources = getResources();
 String contentDesc;
 }

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isInEditMode() public void setMediaCount(int photo, int video, int media) {
 mMediaCount.setText(String.valueOf(media));
 Resources resources = getResources();
 String contentDesc;
 if (video == 0) {
 contentDesc = resources.getString(R.string.photo_count, photo);
 } else if (photo == 0 && video > 0) {
 contentDesc = resources.getString(R.string.video_count, video);
 } else {
 contentDesc = resources.getString(R.string.photo_and_video_count, media);
 }
 }

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isInEditMode() public void setMediaCount(int photo, int video, int media) {
 mMediaCount.setText(String.valueOf(media));
 Resources resources = getResources();
 String contentDesc;
 if (video == 0) {
 contentDesc = resources.getString(R.string.photo_count, photo);
 } else if (photo == 0 && video > 0) {
 contentDesc = resources.getString(R.string.video_count, video);
 } else {
 contentDesc = resources.getString(R.string.photo_and_video_count, media);
 }
 mMediaCount.setContentDescription(contentDesc);
 }

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isInEditMode() public void setMediaCount(int photo, int video, int media) {
 mMediaCount.setText(String.valueOf(media));
 if (!isInEditMode()) {
 Resources resources = getResources();
 String contentDesc;
 if (video == 0) {
 contentDesc = resources.getString(R.string.photo_count, photo);
 } else if (photo == 0 && video > 0) {
 contentDesc = resources.getString(R.string.video_count, video);
 } else {
 contentDesc = resources.getString(R.string.photo_and_video_count, media);
 }
 mMediaCount.setContentDescription(contentDesc);
 }
 }

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Color Palette

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Illustrations

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Assets dependencies {
 
 // Yelp asset libs
 compile 'com.yelp:yelpicons:135.0.0'
 compile ‘com.yelp:yelpdesign:4.0.4’ }

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Assets dependencies {
 
 // Yelp asset libs
 compile 'com.yelp:yelpicons:135.0.0'
 compile ‘com.yelp:yelpdesign:4.0.4’ }

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Color

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Color #666666
 #333333
 #0073bb
 #d0ecfb
 #0097ec
 #999999
 #f5f5f5
 #e6e6e6
 #cccccc
 #daecd2
 #41a700
 #f8e3c7
 #f1bd79
 #f15c00
 #ffebcf
 #dad1e4
 #d32323
 #fcd6d3
 #cddae2
 #ffffff
 #fec011
 #fff7cc

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Color #666666
 #333333
 #0073bb
 #d0ecfb
 #0097ec
 #999999
 #f5f5f5
 #e6e6e6
 #cccccc
 #daecd2
 #41a700
 #f8e3c7
 #f1bd79
 #f15c00
 #ffebcf
 #dad1e4
 #d32323
 #fcd6d3
 #cddae2
 #ffffff
 #fec011
 #fff7cc

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Color #666666
 #333333
 #0073bb
 #d0ecfb
 #0097ec
 #999999
 #f5f5f5
 #e6e6e6
 #cccccc
 #daecd2
 #41a700
 #f8e3c7
 #f1bd79
 #f15c00
 #ffebcf
 #dad1e4
 #d32323
 #fcd6d3
 #cddae2
 #ffffff
 #fec011
 #fff7cc

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Build

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Review Template

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VCS & CI • git submodule • Run the Build for • submodule • consumer app • business app

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Custom Lint Checks

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Custom Lint Checks 
 Button b = new Button(context);
 
 SwitchCompat switchCompat = new SwitchCompat(context);
 
 Snackbar.make(getRootView(), “Test”, LENGTH_SHORT).show();

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Custom Lint Checks @SuppressLint("")
 Button b = new Button(context);
 
 @SuppressLint("")
 SwitchCompat switchCompat = new SwitchCompat(context);
 
 @SuppressLint("")
 Snackbar.make(getRootView(), “Test”, LENGTH_SHORT).show();

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Custom Lint Checks @SuppressLint("NonStyleguideButtonInstance")
 Button b = new Button(context);
 
 @SuppressLint("")
 SwitchCompat switchCompat = new SwitchCompat(context);
 
 @SuppressLint("")
 Snackbar.make(getRootView(), “Test”, LENGTH_SHORT).show();

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Custom Lint Checks @SuppressLint("NonStyleguideButtonInstance")
 Button b = new Button(context);
 
 @SuppressLint("NonStyleguideToggleInstance")
 SwitchCompat switchCompat = new SwitchCompat(context);
 
 @SuppressLint("")
 Snackbar.make(getRootView(), “Test”, LENGTH_SHORT).show();

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Custom Lint Checks @SuppressLint("NonStyleguideButtonInstance")
 Button b = new Button(context);
 
 @SuppressLint("NonStyleguideToggleInstance")
 SwitchCompat switchCompat = new SwitchCompat(context);
 
 @SuppressLint("NonStyleguideSnackbarInstance")
 Snackbar.make(getRootView(), “Test”, LENGTH_SHORT).show();

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Custom Lint Checks // Using stock Button because […] + Ticket number. @SuppressLint("NonStyleguideButtonInstance")
 Button b = new Button(context);
 
 @SuppressLint("NonStyleguideToggleInstance")
 SwitchCompat switchCompat = new SwitchCompat(context);
 
 @SuppressLint("NonStyleguideSnackbarInstance")
 Snackbar.make(getRootView(), “Test”, LENGTH_SHORT).show();

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Custom Lint Checks

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Custom Lint Checks 
 


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Custom Lint Checks 
 


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build.gradle

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build.gradle android {
 lintOptions {
 
 }
 }

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build.gradle android {
 lintOptions {
 abortOnError true
 warningsAsErrors true
 
 }
 }

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build.gradle android {
 lintOptions {
 abortOnError true
 warningsAsErrors true
 
 lintConfig file("lint.xml")
 }
 }

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build.gradle android {
 lintOptions {
 abortOnError true
 warningsAsErrors true
 
 lintConfig file("lint.xml")
 baseline file("lint-baseline.xml")
 }
 }

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Test your component • Your component ❤ Espresso? • Do you handle state changes? • contentDescription ?

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Share

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Documentation • Provide Javadoc • Add Screenshots • Document Attributes • Document Styles

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Screenshots capture • v0.1: Manual Screenshots • v0.2: Automated locally • v0.3: Automated with CI

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StyleguideTestApp • Components Showcase • For Designer • For Developer

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Taking Screenshots with Espresso public class ScreenshotViewActions {
 
 }

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Taking Screenshots with Espresso public class ScreenshotViewActions {
 
 public static ViewAction screenshot(final String folderName, final String fileName) {
 return new ViewAction() {
 
 };
 }
 }

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Taking Screenshots with Espresso public class ScreenshotViewActions {
 
 public static ViewAction screenshot(final String folderName, final String fileName) {
 return new ViewAction() {
 // Other methods omitted.
 
 @Override
 public void perform(UiController uiController, View view) {
 ScreenshotsUtil.takeScreenshot(folderName, fileName, view);
 }
 };
 }
 }

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Sample Espresso Test

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Sample Espresso Test public class StarsViewActivityTests {
 
 }

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Sample Espresso Test public class StarsViewActivityTests {
 
 @Test
 public void takeScreenshot() throws InterruptedException {
 onView(withId(R.id.stars_view_4)).perform(setStarsNumber(4));
 
 }
 }

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Sample Espresso Test public class StarsViewActivityTests {
 
 @Test
 public void takeScreenshot() throws InterruptedException {
 onView(withId(R.id.stars_view_4)).perform(setStarsNumber(4));
 onView(withId(R.id.stars_view_5)).perform(setStarsNumber(5),
 screenshot(FOLDER_NAME, "stars_with_text"));
 
 }
 }

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Sample Espresso Test public class StarsViewActivityTests {
 
 @Test
 public void takeScreenshot() throws InterruptedException {
 onView(withId(R.id.stars_view_4)).perform(setStarsNumber(4));
 onView(withId(R.id.stars_view_5)).perform(setStarsNumber(5),
 screenshot(FOLDER_NAME, "stars_with_text"));
 
 ScreenshotUtil.fullScreenshot(FOLDER_NAME, "stars_fullscreen");
 }
 }

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Bend it, don’t break it! Source: GIPHY

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We are hiring! www.yelp.com/careers/

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Nicola Corti @cortinico [email protected] @YelpEngineering github.com/yelp yelp.com/careers engineeringblog.yelp.com