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What's New in the Android P Preview

Watch the video here → goo.gl/zes4wj

Check out highlights from the first #AndroidP preview, including network-awareness in JobScheduler, improvements to ART including #Kotlin speed and reduced DEX memory usage, a new way of decoding images, including animated GIFs and WebPs. support for HDR VP9 Profile 2 and HEIC images, dual-camera app support, WiFi location using WiFi Round Trip Time, OMAPI for NFC smart card payments, updates to the Neural Network API including an accelerated Pixel 2 driver, a new Fingerprint Dialog, support for edge-to-edge displays with cutouts, and more.

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Creating classes with one role: to hold data? Mark them as “data” classes. The default implementation of equals() is generated (so are hashCode(), toString(), and copy()) and checks for structural equality.

Docs:
https://kotlinlang.org/docs/reference/data-classes.html#data-classes
https://kotlinlang.org/docs/reference/equality.html

#31DaysOfKotlin

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In Kotlin, classes can have mutable and read-only properties, with getters and setters generated by default. You can also implement custom ones if required.

Docs: https://kotlinlang.org/docs/reference/properties.html

#31DaysOfKotlin

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James Smith: +Alex McGilvray What you've described is the "auto-implemented' property in C# parlance. C# generates an anonymous backing field when you do that (and Kotlin has an equivalent syntax). If you need the property to perform some logic, though, then in C# you must define the backing field yourself:

private int prop = 2;
public int Prop {
get { doSomething(); return prop; }
}

If you have 10 or 20 of these, the code starts gettimg really cluttered. Whereas in Kotlin, if you need custom logic, you can use field in the property logic, and Kotlin will still generate the backing field:

val prop: Int = 2
get() { doSomething(); return field; }

You can still do it the C# way (i.e., define your own backing field); you just don't have to.

Alex McGilvray: Ah ok gotcha. Thanks!

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A switch statement with superpowers? Kotlin’s `when` expression can match on just about anything. Literal values, enums, ranges of numbers. You can even call arbitrary functions!

Docs: https://kotlinlang.org/docs/reference/control-flow.html#when-expression

#31DaysOfKotlin

Control Flow: if, when, for, while - Kotlin Programming Language

kotlinlang.org

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Aleksandar Stefanović: +Rafael Ribas Aguiló the evolution of the language depends on the organization that holds it, and the decision it makes. If Oracle decides to implement more language features, so be it, but anyone else can't contribute to the evolution of the language...

Jost Schwider: +Aleksandar Stefanović Exactly!
Therefore the well known and good old Groovy!

Win Naing: Like

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Formatting Strings? Refer to variables and expressions in string literals by putting `$` in front of the variable name. Evaluate expressions using `${expression}`.

Docs: https://kotlinlang.org/docs/reference/basic-types.html#string-templates

#31DaysOfKotlin

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Android P Developer Preview 1 is available today

Read the blog post here → https://goo.gl/Nc3ad2

Get an early look at some of the new features in the next version of Android for testing, development, and don't forget to give us your feedback.

DP1 includes WiFi RTT; multi-camera API, optimized Kotlin; improved notifications and content display; better security and privacy, and much more. With your feedback, we’ll continue to iterate and improve on P, and we’ll have lots more to share at Google I/O in May!

Get started → https://goo.gl/ZDFmvR
Join the discussion in our Google+ community → https://goo.gl/gtc95o

#AndroidP

Previewing Android P

android-developers.googleblog.com

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21h

Android Things Developer Preview 7 is available today. New updates include camera improvements, new Bluetooth APIs, and many stability fixes.

Read the blog post here → goo.gl/o4sLWB

Android Things Developer Preview 7 addresses much of the top developer feedback we've received so far during preview. Download the preview today to try out the improved camera resolutions and Bluetooth pairing/connection APIs. Visit the developer console to learn about new features such as product sharing and device update channels.

Join the discussion in our Google+ community → https://g.co/iotdev

#AndroidThings

Android Things Developer Preview 7

android-developers.googleblog.com

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For loops get superpowers when used with two other Kotlin features: range expressions and destructuring.

Ranges: https://kotlinlang.org/docs/reference/ranges.html

Destructuring: https://kotlinlang.org/docs/reference/multi-declarations.html#destructuring-declarations

#31DaysOfKotlin

Ranges - Kotlin Programming Language

kotlinlang.org

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metin silsüpür: stack= ERROR !!!!!!!!!!!!!!!!!!!!!!!!!!

@Override
public View onCreateInputView()
{
pre = getSharedPreferences("CUSTOM_KEYBOARD_PREFERENCES", 1);
theme = pre.getInt(THEME_KEY, 1);
switch (theme)
{
case 1:
kv = (KeyboardView)getLayoutInflater().inflate(R.layout.keyboard, null);
break;
case 2:
kv = (KeyboardView)getLayoutInflater().inflate(R.layout.keyboard1, null);
break;
case 3:
kv = (KeyboardView)getLayoutInflater().inflate(R.layout.keyboard2, null);
break;
case 4:
kv = (KeyboardView)getLayoutInflater().inflate(R.layout.keyboard3, null);
break;
case 5:
kv = (KeyboardView)getLayoutInflater().inflate(R.layout.keyboard4, null);
break;
case 6:
kv = (KeyboardView)getLayoutInflater().inflate(R.layout.keyboard5, null);
break;
default:
kv = (KeyboardView)getLayoutInflater().inflate(R.layout.keyboard, null);
break;
}
keyboard = new Keyboard(this, R.xml.qwerty);
kv.setKeyboard(keyboard);
kv.setOnKeyboardActionListener(this);
return kv;
}

@Override
public void onStartInputView(EditorInfo info, boolean restarting)
{
super.onStartInputView(info, restarting);
setInputView(onCreateInputView());
}

metin silsüpür: githup=ERROR!!!!!!!!!!!!!!!

package com.gazlaws.codeboard;

import android.content.Context;
import android.content.SharedPreferences;
import android.inputmethodservice.InputMethodService;
import android.inputmethodservice.Keyboard;
import android.inputmethodservice.KeyboardView;
import android.os.Vibrator;
import android.util.Log;
import android.view.KeyEvent;
import android.view.View;
import android.view.inputmethod.EditorInfo;
import android.view.inputmethod.InputConnection;
import android.view.inputmethod.InputMethodManager;

import java.util.List;

/**
* Created by Ruby(aka gazlaws) on 13/02/2016.
*/

public class CodeBoardIME
extends InputMethodService
implements KeyboardView.OnKeyboardActionListener {
private static final int META_CTRL_LEFT_ON = 8192;
private KeyboardView kv;
private Keyboard keyboard;
EditorInfo sEditorInfo;
private Vibrator vibrator;
private boolean vibratorOn;
private boolean shiftLock;
private boolean shift = false;
private boolean ctrl = false;

@Override
public void onKey(
int primaryCode,
int[] KeyCodes) {

InputConnection ic = getCurrentInputConnection();
CharSequence txt = getCurrentInputConnection().getTextBeforeCursor(1000, 0);
int i;
List<Keyboard.Key> keys = keyboard.getKeys();

switch (primaryCode) {
case Keyboard.KEYCODE_DELETE:
sendDownUpKeyEvents(KeyEvent.KEYCODE_DEL);

break;

case 27:
//Escape
long now = System.currentTimeMillis();
int meta = 0;

ic.sendKeyEvent(new KeyEvent(now, now, KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_ESCAPE, 0, KeyEvent.META_CTRL_ON | KeyEvent.META_CTRL_LEFT_ON));

break;

case -13:
InputMethodManager imm = (InputMethodManager)
getSystemService(Context.INPUT_METHOD_SERVICE);
imm.showInputMethodPicker();

// try {
// InputMethodManager imm = (InputMethodManager) this.getSystemService(Context.INPUT_METHOD_SERVICE);
// final IBinder token = this.getWindow().getWindow().getAttributes().token;
// //imm.setInputMethod(token, LATIN);
// imm.switchToLastInputMethod(token);
// } catch (Throwable t) { // java.lang.NoSuchMethodError if API_level<11
// Log.e("WHAA","cannot set the previous input method:");
// t.printStackTrace();
// }
break;

case 18:
ctrl = !ctrl;

for(i=0; i < keys.size();i++) {
if (ctrl) {
if (keys.get(i).label.equals("Ctrl")) {
keys.get(i).label = "CTRL";
break;
}
} else {
if (keys.get(i).label.equals("CTRL")) {
keys.get(i).label = "Ctrl";
break;
}
}
}
kv.invalidateAllKeys();
break;

case 53737:
getCurrentInputConnection().performContextMenuAction(android.R.id.selectAll);
break;
case 53738:
getCurrentInputConnection().performContextMenuAction(android.R.id.cut);
break;
case 53739:
getCurrentInputConnection().performContextMenuAction(android.R.id.copy);
break;
case 53740:
getCurrentInputConnection().performContextMenuAction(android.R.id.paste);
break;

case Keyboard.KEYCODE_SHIFT:

shift = !shift;
keyboard.setShifted(shift);

if (shift){
for(i=0; i < keys.size();i++){
if(keys.get(i).label.equals("Shift")) {
keys.get(i).label = "SHIFT";
break;
}
}
} else for(i=0; i < keys.size();i++){
//Log.e("3","shift");
if(keys.get(i).label.equals("SHIFT")) {

keys.get(i).label = "Shift";
break;
}
}
kv.invalidateAllKeys();
break;

case Keyboard.KEYCODE_DONE:
//sendDownUpKeyEvents(KeyEvent.KEYCODE_ENTER);
switch (sEditorInfo.imeOptions & (EditorInfo.IME_MASK_ACTION | EditorInfo.IME_FLAG_NO_ENTER_ACTION)) {
case EditorInfo.IME_ACTION_GO:
ic.performEditorAction(EditorInfo.IME_ACTION_GO);
break;
case EditorInfo.IME_ACTION_NEXT:
ic.performEditorAction(EditorInfo.IME_ACTION_NEXT);
break;
case EditorInfo.IME_ACTION_DONE:
ic.performEditorAction(EditorInfo.IME_ACTION_DONE);
break;
case EditorInfo.IME_ACTION_SEARCH:
ic.performEditorAction(EditorInfo.IME_ACTION_SEARCH);
break;

case EditorInfo.IME_ACTION_SEND:
ic.performEditorAction(EditorInfo.IME_ACTION_SEND);
break;

default:
ic.sendKeyEvent(new KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_ENTER));
break;
}
break;

case 9:
//tab
// ic.commitText("\u0009", 1);
sendDownUpKeyEvents(KeyEvent.KEYCODE_TAB);
break;

case 14:
sendDownUpKeyEvents(KeyEvent.KEYCODE_DPAD_LEFT);
break;
case 15:
sendDownUpKeyEvents(KeyEvent.KEYCODE_DPAD_UP);
break;
case 16:
sendDownUpKeyEvents(KeyEvent.KEYCODE_DPAD_DOWN);
break;
case 17:
sendDownUpKeyEvents(KeyEvent.KEYCODE_DPAD_RIGHT);
break;

default:
char code = (char) primaryCode;
if (ctrl) {
switch (code) {
case 'a':
case 'A':
getCurrentInputConnection().performContextMenuAction(android.R.id.selectAll);
ctrl = false;
for(i=0; i < keys.size();i++){
if(keys.get(i).label.equals("CTRL")) {
keys.get(i).label = "Ctrl";
break;
}
}
kv.invalidateKey(i);
break;
case 'c':
case 'C':
getCurrentInputConnection().performContextMenuAction(android.R.id.copy);
ctrl = false;
for(i=0; i < keys.size();i++){
if(keys.get(i).label.equals("CTRL")) {
keys.get(i).label = "Ctrl";
break;
}
}
kv.invalidateKey(i);
break;
case 'v':
case 'V':
getCurrentInputConnection().performContextMenuAction(android.R.id.paste);
ctrl = false;
for(i=0; i < keys.size();i++){
if(keys.get(i).label.equals("CTRL")) {
keys.get(i).label = "Ctrl";
break;
}
}
kv.invalidateKey(i);
break;
case 'x':
case 'X':
getCurrentInputConnection().performContextMenuAction(android.R.id.cut);
ctrl = false;
for(i=0; i < keys.size();i++){
if(keys.get(i).label.equals("CTRL")) {
keys.get(i).label = "Ctrl";
break;
}
}
kv.invalidateKey(i);
break;
case 'z':
// event = new KeyEvent(event.getDownTime(), event.getEventTime(),
// event.getAction(), event.getKeyCode(), event
// .getRepeatCount(), event.getDeviceId(), event
// .getScanCode(), KeyEvent.META_SHIFT_LEFT_ON
// | KeyEvent.META_SHIFT_ON);
if (shift) {
long now2 = System.currentTimeMillis();
ic.sendKeyEvent(new KeyEvent(now2, now2, KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_Z, 0, KeyEvent.META_CTRL_ON | KeyEvent.META_CTRL_LEFT_ON | KeyEvent.META_SHIFT_ON | KeyEvent.META_SHIFT_LEFT_ON));

shift = false;
for(i=0; i < keys.size(); i++){
if(keys.get(i).label.equals("SHIFT")) {

keys.get(i).label = "Shift";
break;
}
}
keyboard.setShifted(shift);
kv.invalidateAllKeys();

} else {
long now2 = System.currentTimeMillis();
ic.sendKeyEvent(new KeyEvent(now2, now2, KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_Z, 0, KeyEvent.META_CTRL_ON | KeyEvent.META_CTRL_LEFT_ON));
}

ctrl = false;
for(i=0; i < keys.size();i++){
if(keys.get(i).label.equals("CTRL")) {
keys.get(i).label = "Ctrl";
break;
}
}
kv.invalidateAllKeys();
break;

default:
ic.commitText(String.valueOf(code), 1);
ctrl = false;
for(i=0; i < keys.size();i++){
if(keys.get(i).label.equals("CTRL")) {
keys.get(i).label = "Ctrl";
break;
}
}
kv.invalidateAllKeys();
break;

}

if(shift){
shift=false;
for(i=0; i < keys.size();i++){
if(keys.get(i).label.equals("SHIFT")) {
keys.get(i).label = "Shift";
break;
}
}
keyboard.setShifted(shift);
kv.invalidateAllKeys();
}
} else if (Character.isLetter(code) && shift) {
code = Character.toUpperCase(code);
ic.commitText(String.valueOf(code), 1);
if(!shiftLock) {
shift = false;

for (i = 0; i < keys.size(); i++) {
//Log.e("5", "shift");
if (keys.get(i).label.equals("SHIFT")) {

keys.get(i).label = "Shift";
break;
}
}
keyboard.setShifted(shift);
kv.invalidateAllKeys();
}

} else ic.commitText(String.valueOf(code), 1);

}

}

@Override
public void onPress(int primaryCode) {
if (vibratorOn) {
vibrator = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
vibrator.vibrate(20);
}
}

@Override
public void onRelease(int primaryCode) {

}

@Override
public void onText(CharSequence text) {
}

@Override
public void swipeDown() {

kv.closing();

}

@Override
public void swipeLeft() {

}

@Override
public void swipeRight() {
}

@Override
public void swipeUp() {

}

@Override
public View onCreateInputView() {

SharedPreferences pre = getSharedPreferences("MY_SHARED_PREF", MODE_PRIVATE);

switch (pre.getInt("RADIO_INDEX_COLOUR", 0)) {
case 0:
//kv = (KeyboardView) getLayoutInflater().inflate(R.layout.keyboard, null);
kv = (KeyboardView) getLayoutInflater().inflate(R.layout.keyboard, null);
break;
case 1:
kv = (KeyboardView) getLayoutInflater().inflate(R.layout.keyboard1, null);
break;
case 2:
kv = (KeyboardView) getLayoutInflater().inflate(R.layout.keyboard2, null);
break;
case 3:
kv = (KeyboardView) getLayoutInflater().inflate(R.layout.keyboard3, null);
break;
case 4:
kv = (KeyboardView) getLayoutInflater().inflate(R.layout.keyboard4, null);
break;
case 5:
kv = (KeyboardView) getLayoutInflater().inflate(R.layout.keyboard5, null);
break;

default:
kv = (KeyboardView) getLayoutInflater().inflate(R.layout.keyboard, null);

break;

}

if (pre.getInt("PREVIEW", 0) == 1) {
kv.setPreviewEnabled(true);
} else kv.setPreviewEnabled(false);

if (pre.getInt("VIBRATE", 1) == 1) {
vibratorOn = true;
} else vibratorOn = false;

if (pre.getInt("RADIO_INDEX_LAYOUT", 0) == 0) {

if(pre.getInt("ARROW_ROW",1) == 1){

if (pre.getInt("SIZE", 2) == 0) {
// keyboard = new Keyboard(this, R.xml.qwerty_arrow_small);
}
//else if (pre.getInt("SIZE", 2) == 1) {
// keyboard = new Keyboard(this, R.xml.qwerty_arrow);}
else if (pre.getInt("SIZE", 2) == 3) {
// keyboard = new Keyboard(this, R.xml.qwerty_large_arrow);
} //else keyboard = new Keyboard(this, R.xml.qwerty_medium_arrow);
}
else {

if (pre.getInt("SIZE", 2) == 0) {
// keyboard = new Keyboard(this, R.xml.qwerty_small);
} else if (pre.getInt("SIZE", 2) == 1) {
keyboard = new Keyboard(this, R.xml.qwerty);
}else if (pre.getInt("SIZE", 2) == 3) {
keyboard = new Keyboard(this, R.xml.qwerty_large);
} else keyboard = new Keyboard(this, R.xml.qwerty_medium);
}
}
else {
if(pre.getInt("ARROW_ROW",1) == 1) {
if (pre.getInt("SIZE", 2) == 0) {
// keyboard = new Keyboard(this, R.xml.azerty_arrow_small);
} else if (pre.getInt("SIZE", 2) == 1) {
//keyboard = new Keyboard(this, R.xml.azerty_arrow);
} else if (pre.getInt("SIZE", 2) == 3) {
//keyboard = new Keyboard(this, R.xml.azerty_large_arrow);
} //else keyboard = new Keyboard(this, R.xml.azerty_medium_arrow);
}
else {
if (pre.getInt("SIZE", 2) == 0) {
// keyboard = new Keyboard(this, R.xml.azerty_small);
} else if (pre.getInt("SIZE", 2) == 1) {
// keyboard = new Keyboard(this, R.xml.azerty);
} else if (pre.getInt("SIZE", 2) == 3) {
// keyboard = new Keyboard(this, R.xml.azerty_large);
} //else keyboard = new Keyboard(this, R.xml.azerty_medium);
}
}

if(pre.getInt("SHIFT",0)==1){
shiftLock=true;
} else shiftLock=false;

shift=false;
ctrl=false;
//do this for symbols
if (keyboard !=null){

kv.setKeyboard(keyboard);
kv.setOnKeyboardActionListener(this);

}

return kv;
}

@Override
public void onStartInputView(EditorInfo attribute, boolean restarting) {
super.onStartInputView(attribute, restarting);

setInputView(onCreateInputView());
sEditorInfo = attribute;

}
}

metin silsüpür: HELP=ERROR !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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Now with prisms? Android KTX uses destructuring to assign the component values of a color. You can use destructuring in your classes, or extend existing classes to add destructuring.

Docs: https://kotlinlang.org/docs/reference/multi-declarations.html

#31DaysOfKotlin

Destructuring Declarations - Kotlin Programming Language

kotlinlang.org

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Handling nulls in style? Check out the elvis operator `?:`, to cut your “null-erplate”. It’s just a small bit of syntax sugar to replace nulls with a default value or even return!

Docs → goo.gl/8kUGrd

#31DaysOfKotlin

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