Geekcamp Android
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Introduction to Android. These slides are presented at Geekcamp Singapore, on 22th August at Yahoo! office.
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Geekcamp Android
- 1. Android Development GeekCamp Singapore 22 nd August 2009 Leong Hean Hong (CC) BY-SA Some rights preserved.
- 3. DOB: 490204800 (GMT +8)
- 4. Work: LAMP | Android | iPhone
- 5. Interest: Python, Rubik Cube, Number Theory, Web Technologies
- 6. Groups: SG PHP User Group, KL Google Technology User Group
- 9. Setup
- 11. Views
- 12. Intents
- 13. Demo
- 15. Android Architecture ( http://bit.ly/s73P2 )
- 17. Bytecode on which it operates is not Java bytecode.
- 20. Android Development Tools ( ADT ) eclipse plugin (http s ://dl-ssl.google.com/android/eclipse/)
- 22. Install Eclipse.
- 23. Install ADT.
- 24. Set SDK path in Eclipse preference section.
- 25. Create Android Virtual Device ( AVD ).
- 26. RTFM and start coding.
- 29. Use Sun Java ( โrequires plug-in org.eclipse.wst.sse.uiโ error )
- 30. If installed Eclipse using root , update using root .
- 31. Run <android-sdk>/tools/ddms once, before installing ADT. (solved in ADT 0.9.1 http://bit.ly/15FdZt )
- 35. ย
- 38. layout/ (design Views , similar to HTML)
- 43. TextView for displaying text
- 45. Button text is defined in /res/values/string.xml .
- 46. Add Button (main.xml) <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:gravity="center" android:layout_width="fill_parent" android:layout_height="fill_parent"> <TextView android:layout_width=" wrap_content " android:layout_height="wrap_content" android:text="@string/hello" /> <Button android:id="@+id/helloButton" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/hello_button" /> </LinearLayout>
- 47. Launch Image Gallery private static final int REQUEST_PICK_IMAGE = 1; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Button button = (Button)findViewById(R.id.helloButton); button.setOnClickListener(new OnClickListener() { @Override public void onClick(View arg0) { Intent pickImage = new Intent(Intent.ACTION_PICK); pickImage.setType("image/*"); startActivityForResult(pickImage, REQUEST_PICK_IMAGE); } }); }
- 49. Intent messaging is a facility for late run-time binding between components in the same or different applications.
- 50. Activity , Service , BroadcastReceiver are activated through Intent .
- 53. Create a Layout to display the photo (photo_viewer.xml)
- 54. Use a ImageView to display photo
- 55. GoodByeWorld launch PhotoViewer by sending it an Intent
- 56. The Intent contains the URI of the selected image
- 57. ImageView load image from the URI
- 59. Contains an ImageView for displaying image
- 60. The ImageView is given an ID ( photoView )
- 61. photo_viewer.xml <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> < ImageView android:id="@+id/photoView" android:layout_width="fill_parent" android:layout_height="fill_parent" /> </LinearLayout>
- 62. PhotoViewer.java protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView( R.layout.photo_viewer ); ImageView photoView = (ImageView)findViewById( R.id.photoView ); photoView.setImageURI( getIntent().getData() ); }
- 63. AndroidManifest.xml <application android:icon="@drawable/icon" android:label="@string/app_name"> <activity android:name=".GoodByeWorld" android:label="@string/app_name"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <activity android:name=".PhotoViewer"></activity> </application>
- 64. Create Menu private static final int MENU_RED = Menu.FIRST; private static final int MENU_GREEN = Menu.FIRST + 1; private static final int MENU_BLUE = Menu.FIRST + 2; private static final int MENU_RAND = Menu.FIRST + 3; public boolean onCreateOptionsMenu (Menu menu) { super.onCreateOptionsMenu(menu); menu.add(Menu.NONE, MENU_RED, Menu.NONE, "Filter Red"); menu.add(Menu.NONE, MENU_GREEN, Menu.NONE, "Filter Green"); menu.add(Menu.NONE, MENU_BLUE, Menu.NONE, "Filter Blue"); menu.add(Menu.NONE, MENU_RAND, Menu.NONE, "Random Filter"); return true; }
- 65. Response to Menu Selection public boolean onMenuItemSelected (int featureId, MenuItem item) { super.onMenuItemSelected(featureId, item); switch(item.getItemId()) { case MENU_RED: photoView. setColorFilter (redFilter()); break; case MENU_GREEN: photoView. setColorFilter (greenFilter()); break; case MENU_BLUE: photoView. setColorFilter (blueFilter()); break; case MENU_RAND: photoView. setColorFilter (randFilter()); break; } return true; }
- 67. ColorMatrixColorFilter private ColorMatrixColorFilter redFilter() { return new ColorMatrixColorFilter(new float[] { 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0 }); }
- 68. Q & A Any question?