Professional Android 4 Application Development

By Reto Meier

Developers, construct cellular Android apps utilizing Android 4

The fast-growing approval for Android smartphones and drugs creates an enormous possibilities for builders. in case you are an skilled developer, you can begin growing strong cellular Android apps instantaneously with this specialist consultant to Android four software improvement. Written by way of considered one of Google's lead Android developer advocates, this useful ebook walks you thru a chain of hands-on initiatives that illustrate the beneficial properties of the Android SDK. that comes with all of the new APIs brought in Android three and four, together with construction for pills, utilizing the motion Bar, wireless Direct, NFC Beam, and more.

  • Shows skilled builders tips to create cellular purposes for Android smartphones and tablets
  • Revised and extended to hide the entire Android SDK releases together with Android 4.0 (Ice Cream Sandwich), together with all up to date APIs, and the most recent adjustments to the Android platform.
  • Explains new and more suitable gains corresponding to drag and drop, fragments, the motion bar, greater multitouch help, new environmental sensor aid, significant advancements to the animation framework, and quite a number new communications innovations together with NFC and wireless direct.
  • Provides sensible counsel on publishing and advertising your purposes, most sensible practices for consumer event, and more

This booklet is helping you learn how to grasp the layout, lifecycle, and UI of an Android app via functional workouts, that you may then use as a foundation for constructing your personal Android apps.

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Indd one hundred thirty five 4/11/2012 10:07:35 AM Meier02275 c04 V2 - 03/19/2012 web page 136 136 x bankruptcy four development consumer INTERFACES 1. Create a brand new ToDoListItemView type that extends TextView. comprise a stub for overriding the onDraw technique, and enforce constructors that decision a brand new init strategy stub. package deal com. paad. todolist; import import import import import import android. content material. Context; android. content material. res. assets; android. pix. Canvas; android. images. Paint; android. util. AttributeSet; android. widget. TextView; public category ToDoListItemView extends TextView { public ToDoListItemView (Context context, AttributeSet ats, int ds) { super(context, ats, ds); init(); } public ToDoListItemView (Context context) { super(context); init(); } public ToDoListItemView (Context context, AttributeSet attrs) { super(context, attrs); init(); } inner most void init() { } @Override public void onDraw(Canvas canvas) { // Use the bottom TextView to render the textual content. great. onDraw(canvas); } } 2. Create a brand new colours. xml source within the res/values folder. Create new colour values for the paper, margin, line, and textual content colours. #EEF8E0A0 #FF0000FF #90FF0000 #AA0000FF three. Create a brand new dimens. xml source file, and upload a brand new worth for the paper’s margin width. 30dp c04. indd 136 4/11/2012 10:07:35 AM Meier02275 c04 V2 - 03/19/2012 web page 137 developing New perspectives four. x 137 With the assets defined, you’re able to customise the ToDoListItemView visual appeal. Create new inner most example variables to shop the Paint gadgets you’ll use to attract the paper heritage and margin. additionally create variables for the paper colour and margin width values. Fill within the init way to get situations of the assets you created within the final steps, and create the Paint items. deepest inner most deepest inner most Paint marginPaint; Paint linePaint; int paperColor; go with the flow margin; deepest void init() { // Get a connection with our source desk. assets myResources = getResources(); // Create the paint brushes we are going to use within the onDraw strategy. marginPaint = new Paint(Paint. ANTI_ALIAS_FLAG); marginPaint. setColor(myResources. getColor(R. colour. notepad_margin)); linePaint = new Paint(Paint. ANTI_ALIAS_FLAG); linePaint. setColor(myResources. getColor(R. colour. notepad_lines)); // Get the paper history colour and the margin width. paperColor = myResources. getColor(R. colour. notepad_paper); margin = myResources. getDimension(R. dimen. notepad_margin); } five. to attract the paper, override onDraw and draw the picture utilizing the Paint gadgets you created in step four. After you’ve drawn the paper photograph, name the superclass’s onDraw procedure and allow it draw the textual content as ordinary. @Override public void onDraw(Canvas canvas) { // colour as paper canvas. drawColor(paperColor); // Draw governed strains canvas.

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