Android WAT?!? - Speaker Deck

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Android WAT?!? by Alexey Buzdin

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Android WAT?!? by Alexey Buzdin *aka 7 things I like about Android

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Alexey Buzdin

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WAT Gary Bernhardt @garybernhardt https://www.destroyallsoftware.com/talks/wat 2012 inspired by

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DISCLAIMER All characters, events, thoughts and ideas used in this presentation — even those based on real life — are entirely ﬁctional and purely subjective to speaker opinion. :)

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“Writing API is tough, writing good ones is an art” quote: me

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*Android SDK 21 ๏ JUnit ๏ TextView ๏ Activity ๏ String ๏ ViewGroup ๏ View ๏ Context

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"Java Code Conventions”: Files longer than 2000 lines are cumbersome and should be avoided.

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*Android SDK 21 ๏ JUnit ๏ TextView ๏ Activity ๏ String ๏ ViewGroup ๏ View ๏ Context

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*Android SDK 21 ๏ JUnit ๏ TextView ๏ Activity ๏ String ๏ ViewGroup ๏ View ๏ Context - 2197

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*Android SDK 21 ๏ JUnit ๏ TextView ๏ Activity ๏ String ๏ ViewGroup ๏ View ๏ Context - 2197

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*Android SDK 21 ๏ JUnit ๏ TextView ๏ Activity ๏ String - 3154 ๏ ViewGroup ๏ View ๏ Context - 2197

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*Android SDK 21 ๏ JUnit ๏ TextView - 11536 ๏ Activity ๏ String - 3154 ๏ ViewGroup ๏ View - 14878 ๏ Context - 2197

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*Android SDK 21 ๏ JUnit - 5756 ๏ TextView - 11536 ๏ Activity - 4658 ๏ String - 3154 ๏ ViewGroup - 5691 ๏ View - 14878 ๏ Context - 2197

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#01 Android Y U No Generics?

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ImageView image = (ImageView) ﬁndViewById(R.id.image); #01 Android Y U No Generics?

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ImageView image = (ImageView) ﬁndViewById(R.id.image); #01 Android Y U No Generics? Custom wrapper; ButterKnife; Android Data Binding Solved by:

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How to get Window height/width? #02

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How to get Window height/width? #02 Display display = getWindowManager().getDefaultDisplay();

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How to get Window height/width? #02 Display display = getWindowManager().getDefaultDisplay(); display.getWidth(); display.getHeight();

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How to get Window height/width? #02 Display display = getWindowManager().getDefaultDisplay(); display.getWidth(); // deprecated display.getHeight(); // deprecated

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How to get Window height/width? #02 Display display = getWindowManager().getDefaultDisplay(); Point size = new Point(); display.getSize(size); int width = size.x; int height = size.y;

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How to get Window height/width? #02 Tuple out parameter srsly? Display display = getWindowManager().getDefaultDisplay(); Point size = new Point(); display.getSize(size); int width = size.x; int height = size.y;

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#03 View state

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#03 View state to Enable a view use ->

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public void setEnabled(boolean enabled) #03 View state to Enable a view use ->

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public void setEnabled(boolean enabled) #03 View state to Enable a view use -> to Hide a view use ->

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public void setEnabled(boolean enabled) #03 View state to Enable a view use -> public void setVisib…. to Hide a view use ->

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public void setEnabled(boolean enabled) #03 View state to Enable a view use -> public void setVisibility (int visibility) to Hide a view use ->

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Enums, what enums? public void setEnabled(boolean enabled) #03 View state to Enable a view use -> public void setVisibility (int visibility) One of VISIBLE, INVISIBLE, or GONE. to Hide a view use ->

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Who came up with this names? #04

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Who came up with this names? BoringLayout #04

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Who came up with this names? ActivityInstrumentationTestCase2 BoringLayout #04

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Who came up with this names? ActivityInstrumentationTestCase2 Log.wtf() BoringLayout #04

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Who came up with this names? ActivityInstrumentationTestCase2 Log.wtf() BoringLayout UserManager isUserAGoat #04

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Who came up with this names? ActivityInstrumentationTestCase2 Log.wtf() BoringLayout UserManager isUserAGoat #04 public static ﬁnal int removeBeforeMRelease

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No content

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Do you like nulls? #05

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Drawable drw = getResources().getDrawable(R.drawable.btn); btn.setCompoundDrawables(drw, null, null, null); Do you like nulls? #05

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Drawable drw = getResources().getDrawable(R.drawable.btn); btn.setCompoundDrawables(drw, null, null, null); Do you like nulls? SQLiteDatabase db = this.getReadableDatabase(); Cursor cursor = db.query(TABLE_CONTACTS, new String[] {KEY_ID, KEY_NAME, KEY_PH_NO }, KEY_ID + "=?",new String[] { String.valueOf(id) }, null, null, null, null); #05 or

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#06 The Cake is a lie!

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#06 Intent intent = new Intent(Intent.ACTION_VIEW); intent.setData(Uri.parse(pathToMyPdf)); intent.setType("application/pdf"); startActivity(intent); The Cake is a lie!

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#06 Intent intent = new Intent(Intent.ACTION_VIEW); intent.setData(Uri.parse(pathToMyPdf)); intent.setType("application/pdf"); startActivity(intent); The Cake is a lie! don’t work… Instead:

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#06 Intent intent = new Intent(Intent.ACTION_VIEW); intent.setData(Uri.parse(pathToMyPdf)); intent.setType("application/pdf"); startActivity(intent); Intent intent = new Intent(Intent.ACTION_VIEW); intent. setDataAndType(Uri.parse(pathToMyPdf), "application/pdf"); startActivity(intent); The Cake is a lie! don’t work… Instead:

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#07 My favourite Toast.makeText(this, "hello", 2000);

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#07 My favourite Toast.makeText(this, "hello", 2000); <- 2 seconds

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#07 My favourite Toast.makeText(this, "hello", 0); Toast.makeText(this, "hello", 2000); <- 2 seconds

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#07 My favourite Toast.makeText(this, "hello", 0); <- 2 seconds Toast.makeText(this, "hello", 2000); <- 2 seconds

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#07 My favourite Toast.makeText(this, "hello", 0); Toast.makeText(this, "hello", 1); <- 2 seconds Toast.makeText(this, "hello", 2000); <- 2 seconds

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#07 My favourite Toast.makeText(this, "hello", 0); Toast.makeText(this, "hello", 1); <- 2 seconds Toast.makeText(this, "hello", 2000); <- 2 seconds <- 3.5 seconds

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#07 My favourite Toast.makeText(this, "hello", 0); Toast.makeText(this, "hello", 1000); Toast.makeText(this, "hello", 1); <- 2 seconds Toast.makeText(this, "hello", 2000); <- 2 seconds <- 3.5 seconds

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#07 My favourite Toast.makeText(this, "hello", 0); Toast.makeText(this, "hello", 1000); Toast.makeText(this, "hello", 1); <- 2 seconds Toast.makeText(this, "hello", 2000); <- 2 seconds <- 2 seconds <- 3.5 seconds

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#07 My favourite Toast.makeText(this, "hello", 0); Toast.makeText(this, "hello", 10000); Toast.makeText(this, "hello", 1000); Toast.makeText(this, "hello", 1); <- 2 seconds Toast.makeText(this, "hello", 2000); <- 2 seconds <- 2 seconds <- 3.5 seconds

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#07 My favourite Toast.makeText(this, "hello", 0); Toast.makeText(this, "hello", 10000); Toast.makeText(this, "hello", 1000); Toast.makeText(this, "hello", 1); <- 2 seconds <- 2 seconds Toast.makeText(this, "hello", 2000); <- 2 seconds <- 2 seconds <- 3.5 seconds

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NotificationManagerService.scheduleTimeoutLocked() { … long delay = r.duration == Toast.LENGTH_LONG ? LONG_DELAY : SHORT_DELAY; … } private static final int LONG_DELAY = 3500; // 3.5 seconds private static final int SHORT_DELAY = 2000; // 2 seconds public static final int LENGTH_SHORT = 0; public static final int LENGTH_LONG = 1;

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The END! ›˘ʣ›ớᵲᴸᵲ