Android™ Application Development - Bahar Ali Khan

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Chapter 11: Advanced Android <strong>Development</strong> 368 } slideInBottom = AnimationUtils.loadAnimation(this, R.anim.slide_bottom_in); slideOutBottom = AnimationUtils.loadAnimation(this, R.anim.slide_bottom_out); myTextView = (TextView)findViewById(R.id.myTextView); Each screen transition consists of two animations chained together: sliding out the old text before sliding in the new text. Rather than create multiple Views, you can change the value of the View once it’s “off screen” before sliding it back in from the opposite side. 5. Create a new method that applies a slide-out animation and waits for it to complete before modifying the text and initiating the slide-in animation. private void applyAnimation(Animation _out, Animation _in, String _newText) { final String text = _newText; final Animation in = _in; } // Ensure the text stays out of screen when the slide-out // animation has completed. _out.setFillAfter(true); // Create a listener to wait for the slide-out animation to complete. _out.setAnimationListener(new AnimationListener() { public void onAnimationEnd(Animation _animation) { // Change the text myTextView.setText(text); // Slide it back in to view myTextView.startAnimation(in); } public void onAnimationRepeat(Animation _animation) {} public void onAnimationStart(Animation _animation) {} }); // Apply the slide-out animation myTextView.startAnimation(_out); 6. The text displayed can represent nine positions. To keep track of the current location, create an enum for each position and an instance variable to track it. TextPosition textPosition = TextPosition.Center; enum TextPosition { UpperLeft, Top, UpperRight, Left, Center, Right, LowerLeft, Bottom, LowerRight }; 7. Create a new method movePosition that takes the current position, and the direction to move, and calculates the new position. It should then execute the appropriate animation sequence created in Step 5. private void movePosition(TextPosition _current, TextPosition _directionPressed) {
} Animation in; Animation out; TextPosition newPosition; Chapter 11: Advanced Android <strong>Development</strong> if (_directionPressed == TextPosition.Left){ in = slideInLeft; out = slideOutLeft; } else if (_directionPressed == TextPosition.Right){ in = slideInRight; out = slideOutRight; } else if (_directionPressed == TextPosition.Top){ in = slideInTop; out = slideOutTop; } else { in = slideInBottom; out = slideOutBottom; } int newPosValue = _current.ordinal(); int currentValue = _current.ordinal(); // To simulate the effect of ‘tilting’ the device moving in one // direction should make text for the opposite direction appear. // Ie. Tilting right should make left appear. if (_directionPressed == TextPosition.Bottom) newPosValue = currentValue - 3; else if (_directionPressed == TextPosition.Top) newPosValue = currentValue + 3; else if (_directionPressed == TextPosition.Right) { if (currentValue % 3 != 0) newPosValue = currentValue - 1; } else if (_directionPressed == TextPosition.Left) { if ((currentValue+1) % 3 != 0) newPosValue = currentValue + 1; } if (newPosValue != currentValue && newPosValue > -1 && newPosValue < 9){ newPosition = TextPosition.values()[newPosValue]; } applyAnimation(in, out, newPosition.toString()); textPosition = newPosition; 8. Wire up the D-pad by overriding the Activity’s onKeyDown handler to listen for key presses and trigger movePosition accordingly. @Override public boolean onKeyDown(int _keyCode, KeyEvent _event) { 369
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Professional Android Application su
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Professional Android Application D
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Professional Android Application D
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About the Author Originally from Pe
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Acknowledgments A big thank you goe
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Contents Chapter 2: Getting Started
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Contents xii Saving and Loading Fil
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Contents Chapter 10: Accessing Andr
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Introduction Now is an exciting tim
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Introduction covered, you can move
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Introduction At http://p2p.wrox.com
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Chapter 1: Hello, Android 2 Using t
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Chapter 1: Hello, Android An Open P
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Chapter 1: Hello, Android 6 ❑ ❑
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Chapter 1: Hello, Android 8 When ma
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Chapter 1: Hello, Android 10 In mar
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Chapter 1: Hello, Android 12 Each A
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Chapter 1: Hello, Android 14 ❑ Da
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Chapter 1: Hello, Android 16 ❑ an
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Getting Started All you need to sta
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Chapter 2: Getting Started Unless o
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Installing the ADT Plug-in Install
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Chapter 2: Getting Started 3. In th
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Chapter 2: Getting Started If every
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} lp = new LinearLayout.LayoutParam
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❑ ❑ ❑ ❑ ❑ Small screens w
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Chapter 2: Getting Started on how t
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Chapter 2: Getting Started To start
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Ensuring a Seamless User Experience
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Figure 2-11 Chapter 2: Getting Star
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} myListView.setAdapter(aa); Chapte
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Chapter 2: Getting Started A number
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Creating Applications and Activitie
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Chapter 3: Creating Applications an
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Creating Resources Chapter 3: Creat
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❑ ❑ #ARGB #ARRGGBB Chapter 3: C
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android:startOffset=”500” andro
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Referencing Resources in Resources
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} } Chapter 3: Creating Application
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Chapter 4: Creating User Interfaces
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Chapter 5: Intents, Broadcast Recei
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Data Storage, Retrieval, and Sharin
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Chapter 6: Data Storage, Retrieval,
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} } } Chapter 6: Data Storage, Retr
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Querying Your Database Chapter 6: D
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} // Open or create the database to
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Adding, Updating, and Deleting Cont
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} } Chapter 6: Data Storage, Retrie
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} } break; Chapter 6: Data Storage,
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Maps, Geocoding, and Location-Based
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Chapter 7: Maps, Geocoding, and Loc
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} Chapter 7: Maps, Geocoding, and L
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Summary Chapter 7: Maps, Geocoding,
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Chapter 8: Working in the Backgroun
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Peer-to-Peer Communication In this
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Chapter 9: Peer-to-Peer Communicati
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} Chapter 9: Peer-to-Peer Communica
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Handling Subscription Requests Chap
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Figure 9-4 Chapter 9: Peer-to-Peer
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Accessing Android Hardware Android
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Android™ Application Development - Bahar Ali Khan

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