Intro to Android for iOS developers
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The document serves as an introduction to Android development for iOS developers, focusing on layouts, intents, and components. It includes code snippets illustrating Android UI elements like TextView, Button, and layout structures such as LinearLayout and RelativeLayout. Additionally, it covers the activity lifecycle, explicit and implicit intents, and resources needed for developing Android applications.
Intro to Android for iOS developers
- 1. Intro to Android for iOS developers Chiu-Ki Chan @chiuki
- 3. @chiuki@chiuki Hello World Layouts Intents & Components
- 4. Hello World
- 5. @chiuki
- 7. @chiuki
- 8. @chiuki
- 9. @chiuki xib
- 10. @chiuki
- 11. @chiuki
- 12. @chiuki
- 13. @chiuki
- 14. @chiuki IBOutlet
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- 20. @chiuki
- 23. @chiuki@chiuki IBAction public class MainActivity extends Activity { private TextView countView; private int count = 0; protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); countView = (TextView) findViewById(R.id.count); updateCount(); } public void add(View v) { count += 1; updateCount(); } private void updateCount() { countView.setText(String.valueOf(count)); } } android:onClick="add"
- 24. @chiuki@chiuki Update view public class MainActivity extends Activity { private TextView countView; private int count = 0; protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); countView = (TextView) findViewById(R.id.count); updateCount(); } public void add(View v) { count += 1; updateCount(); } private void updateCount() { countView.setText(String.valueOf(count)); } }
- 25. @chiuki
- 26. @chiuki
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- 30. @chiuki
- 31. @chiuki
- 32. @chiuki <RelativeLayout> <TextView android:id="@+id/count" android:layout_centerInParent="true" /> <Button android:id="@+id/reset" android:layout_below="@id/count" android:layout_centerHorizontal="true" android:text="@string/reset" /> <Button android:layout_below="@id/count" android:layout_toLeftOf="@id/reset" android:text="@string/subtract" /> <Button android:layout_below="@id/count" android:layout_toRightOf="@id/reset" android:text="@string/add" /> </RelativeLayout>
- 33. @chiuki <RelativeLayout> <TextView android:id="@+id/count" android:layout_centerInParent="true" /> <Button android:id="@+id/reset" android:layout_below="@id/count" android:layout_centerHorizontal="true" android:text="@string/reset" /> <Button android:layout_below="@id/count" android:layout_toLeftOf="@id/reset" android:text="@string/subtract" /> <Button android:layout_below="@id/count" android:layout_toRightOf="@id/reset" android:text="@string/add" /> </RelativeLayout>
- 34. @chiuki <RelativeLayout> <TextView android:id="@+id/count" android:layout_centerInParent="true" /> <Button android:id="@+id/reset" android:layout_below="@id/count" android:layout_centerHorizontal="true" android:text="@string/reset" /> <Button android:layout_below="@id/count" android:layout_toLeftOf="@id/reset" android:text="@string/subtract" /> <Button android:layout_below="@id/count" android:layout_toRightOf="@id/reset" android:text="@string/add" /> </RelativeLayout>
- 35. @chiuki <RelativeLayout> <TextView android:id="@+id/count" android:layout_centerInParent="true" /> <Button android:id="@+id/reset" android:layout_below="@id/count" android:layout_centerHorizontal="true" android:text="@string/reset" /> <Button android:layout_toLeftOf="@id/reset" android:text="@string/subtract" /> <Button android:layout_below="@id/count" android:layout_toRightOf="@id/reset" android:text="@string/add" /> </RelativeLayout>
- 36. @chiuki <RelativeLayout> <TextView android:id="@+id/count" android:layout_centerInParent="true" /> <Button android:id="@+id/reset" android:layout_below="@id/count" android:layout_centerHorizontal="true" android:text="@string/reset" /> <Button android:layout_below="@id/count" android:layout_toLeftOf="@id/reset" android:text="@string/subtract" /> <Button android:layout_below="@id/count" android:layout_toRightOf="@id/reset" android:text="@string/add" /> </RelativeLayout>
- 38. @chiuki@chiuki Bigger text on tablets
- 39. Resource Folders
- 41. @chiuki@chiuki res/values/dimens.xml <TextView android:id="@+id/count" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="@dimen/counter_size" /> res/layout/activity_main.xml <dimen name="counter_size" value="128sp" /> res/values/dimens.xml
- 42. @chiuki@chiuki res/values-sw600dp/dimens.xml <TextView android:id="@+id/count" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="@dimen/counter_size" /> res/layout/activity_main.xml <dimen name="counter_size" value="128sp" /> <dimen name="counter_size" value="256sp" /> res/values/dimens.xml res/values-sw600dp/dimens.xml
- 43. @chiuki@chiuki Resource Folders Type Variation layout values drawable menu Language & Region: en, fr, fr-rCA, ja Screen size: small, large, sw600dp, h400dp Screen orientation: port, land Screen density: ldpi, mdpi, hdpi, xhdpi, nodpi, tvdpi Platform version: v4, v11, v14 UI mode: car, desk, television, appliance http://developer.android.com/guide/topics/resources/providing-resources.html
- 44. @chiuki@chiuki Resource Folders Type Variation layout values drawable menu Language & Region: en, fr, fr-rCA, ja Screen size: small, large, sw600dp, h400dp Screen orientation: port, land Screen density: ldpi, mdpi, hdpi, xhdpi, nodpi, tvdpi Platform version: v4, v11, v14 UI mode: car, desk, television, appliance http://developer.android.com/guide/topics/resources/providing-resources.html res/values-sw600dp/dimens.xml
- 45. @chiuki@chiuki Resource Folders Type Variation layout values drawable menu Language & Region: en, fr, fr-rCA, ja Screen size: small, large, sw600dp, h400dp Screen orientation: port, land Screen density: ldpi, mdpi, hdpi, xhdpi, nodpi, tvdpi Platform version: v4, v11, v14 UI mode: car, desk, television, appliance http://developer.android.com/guide/topics/resources/providing-resources.html res/drawable-hdpi/ic_launcher.png
- 46. @chiuki@chiuki Resource Folders Type Variation layout values drawable menu Language & Region: en, fr, fr-rCA, ja Screen size: small, large, sw600dp, h400dp Screen orientation: port, land Screen density: ldpi, mdpi, hdpi, xhdpi, nodpi, tvdpi Platform version: v4, v11, v14 UI mode: car, desk, television, appliance http://developer.android.com/guide/topics/resources/providing-resources.html res/drawable-hdpi/ic_launcher.png @2x
- 47. @chiuki@chiuki Resource Folders Type Variation layout values drawable menu Language & Region: en, fr, fr-rCA, ja Screen size: small, large, sw600dp, h400dp Screen orientation: port, land Screen density: ldpi, mdpi, hdpi, xhdpi, nodpi, tvdpi Platform version: v4, v11, v14 UI mode: car, desk, television, appliance http://developer.android.com/guide/topics/resources/providing-resources.html res/layout-ja/name.xml
- 62. More Activities
- 63. @chiuki@chiuki startActivity (explicit) Intent intent = new Intent(this, NumberActivity.class); intent.putExtra("count", count); startActivity(intent);
- 64. @chiuki@chiuki startActivity (explicit) Intent intent = new Intent(this, NumberActivity.class); intent.putExtra("count", count); startActivity(intent);
- 65. @chiuki@chiuki startActivity (explicit) Intent intent = new Intent(this, NumberActivity.class); intent.putExtra("count", count); startActivity(intent);
- 66. @chiuki@chiuki startActivity (implicit) Intent intent = new Intent(Intent.ACTION_VIEW); intent.setData(Uri.parse("http://twitter.com/chiuki")); startActivity(intent);
- 67. @chiuki@chiuki startActivity (implicit) Intent intent = new Intent(Intent.ACTION_VIEW); intent.setData(Uri.parse("http://twitter.com/chiuki")); startActivity(intent);
- 68. @chiuki@chiuki startActivity (implicit) Intent intent = new Intent(Intent.ACTION_VIEW); intent.setData(Uri.parse("http://twitter.com/chiuki")); startActivity(intent);
- 69. @chiuki@chiuki startActivity (implicit) Intent intent = new Intent(Intent.ACTION_VIEW); intent.setData(Uri.parse("http://twitter.com/chiuki")); startActivity(intent);
- 70. @chiuki@chiuki Register your Activity <activity android:name=".YourActivity"> <intent-filter> <action android:name="android.intent.action.VIEW" /> <category android:name="android.intent.category.DEFAULT" /> <category android:name="android.intent.category.BROWSABLE" /> <data android:scheme="http" android:host="twitter.com" /> </intent-filter> </activity> AndroidManifest.xml Intent intent = new Intent(Intent.ACTION_VIEW); intent.setData(Uri.parse("http://twitter.com/chiuki")); startActivity(intent); Info.plist
- 71. @chiuki@chiuki IntentFilter: Action <activity android:name=".YourActivity"> <intent-filter> <action android:name="android.intent.action.VIEW" /> <category android:name="android.intent.category.DEFAULT" /> <category android:name="android.intent.category.BROWSABLE" /> <data android:scheme="http" android:host="twitter.com" /> </intent-filter> </activity> AndroidManifest.xml Intent intent = new Intent(Intent.ACTION_VIEW); intent.setData(Uri.parse("http://twitter.com/chiuki")); startActivity(intent);
- 72. @chiuki@chiuki IntentFilter: Data <activity android:name=".YourActivity"> <intent-filter> <action android:name="android.intent.action.VIEW" /> <category android:name="android.intent.category.DEFAULT" /> <category android:name="android.intent.category.BROWSABLE" /> <data android:scheme="http" android:host="twitter.com" /> </intent-filter> </activity> AndroidManifest.xml Intent intent = new Intent(Intent.ACTION_VIEW); intent.setData(Uri.parse("http://twitter.com/chiuki")); startActivity(intent);
- 73. @chiuki@chiuki IntentFilter: Category <activity android:name=".YourActivity"> <intent-filter> <action android:name="android.intent.action.VIEW" /> <category android:name="android.intent.category.DEFAULT" /> <category android:name="android.intent.category.BROWSABLE" /> <data android:scheme="http" android:host="twitter.com" /> </intent-filter> </activity> AndroidManifest.xml Intent intent = new Intent(Intent.ACTION_VIEW); intent.setData(Uri.parse("http://twitter.com/chiuki")); startActivity(intent);
- 74. @chiuki@chiuki IntentFilter: Category <activity android:name=".YourActivity"> <intent-filter> <action android:name="android.intent.action.VIEW" /> <category android:name="android.intent.category.DEFAULT" /> <category android:name="android.intent.category.BROWSABLE" /> <data android:scheme="http" android:host="twitter.com" /> </intent-filter> </activity> AndroidManifest.xml Intent intent = new Intent(Intent.ACTION_VIEW); intent.setData(Uri.parse("http://twitter.com/chiuki")); startActivity(intent);
- 75. @chiuki@chiuki Intent Data <activity android:name=".YourActivity"> <intent-filter> <action android:name="android.intent.action.VIEW" /> <category android:name="android.intent.category.DEFAULT" /> <category android:name="android.intent.category.BROWSABLE" /> <data android:scheme="http" android:host="twitter.com" /> </intent-filter> </activity> Uri uri = getIntent().getData(); AndroidManifest.xml YourActivity.java
- 76. @chiuki@chiuki startActivityForResult private static final int REQUEST_CODE_CAMERA = 1; Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); startActivityForResult(intent, REQUEST_CODE_CAMREA); protected void onActivityResult( int requestCode, int resultCode, Intent data) { if (requestCode == REQUEST_CODE_CAMERA && resultCode == RESULT_OK) { Bitmap bitmap = (Bitmap) data.getExtras().get("data"); } }
- 77. @chiuki@chiuki startActivityForResult private static final int REQUEST_CODE_CAMERA = 1; Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); startActivityForResult(intent, REQUEST_CODE_CAMERA); protected void onActivityResult( int requestCode, int resultCode, Intent data) { if (requestCode == REQUEST_CODE_CAMERA && resultCode == RESULT_OK) { Bitmap bitmap = (Bitmap) data.getExtras().get("data"); } }
- 78. @chiuki@chiuki Providing Result Intent data = new Intent(); data.putExtra("data", bitmap); setResult(RESULT_OK, data); finish(); protected void onActivityResult( int requestCode, int resultCode, Intent data) { if (requestCode == REQUEST_CODE_CAMERA && resultCode == RESULT_OK) { Bitmap bitmap = (Bitmap) data.getExtras().get("data"); } }
- 79. @chiuki@chiuki Intent Data Intent data = new Intent(); data.putExtra("data", bitmap); setResult(RESULT_OK, data); finish(); protected void onActivityResult( int requestCode, int resultCode, Intent data) { if (requestCode == REQUEST_CODE_CAMERA && resultCode == RESULT_OK) { Bitmap bitmap = (Bitmap) data.getExtras().get("data"); } }
- 80. @chiuki@chiuki Result Code Intent data = new Intent(); data.putExtra("data", bitmap); setResult(RESULT_OK, data); finish(); protected void onActivityResult( int requestCode, int resultCode, Intent data) { if (requestCode == REQUEST_CODE_CAMERA && resultCode == RESULT_OK) { Bitmap bitmap = (Bitmap) data.getExtras().get("data"); } }
- 81. @chiuki@chiuki Share intent Intent intent = new Intent(Intent.ACTION_SEND); intent.putExtra(Intent.EXTRA_SUBJECT, subject); intent.putExtra(Intent.EXTRA_TEXT, message); intent.setType("image/*"); Uri uri = Uri.fromFile(new File(path)); intent.putExtra(Intent.EXTRA_STREAM, uri);
- 82. @chiuki@chiuki IntentFilter: Type <activity android:name=".YourActivity"> <intent-filter> <action android:name="android.intent.action.ACTION_SEND" /> <category android:name="android.intent.category.DEFAULT" /> <data android:mimeType="image/*" /> </intent-filter> </activity> AndroidManifest.xml Intent intent = new Intent(Intent.ACTION_SEND); intent.setType("image/*");
- 83. @chiuki@chiuki Intent Data String subject = intent.getStringExtra(Intent.EXTRA_SUBJECT); String message = intent.getStringExtra(Intent.EXTRA_TEXT); Uri imageUri = (Uri) intent.getParcelableExtra(Intent.EXTRA_STREAM); YourActivity.java Intent intent = new Intent(Intent.ACTION_SEND); intent.putExtra(Intent.EXTRA_SUBJECT, subject); intent.putExtra(Intent.EXTRA_TEXT, message); intent.setType("image/*"); Uri uri = Uri.fromFile(new File(path)); intent.putExtra(Intent.EXTRA_STREAM, uri);
- 89. @chiuki@chiuki BroadcastReceiver Respond Battery low Wifi connected Incoming SMS App installed Screen off
- 90. @chiuki@chiuki ContentProvider Provide data to other apps
- 91. @chiuki@chiuki ContentProvider Provide data to other apps Contacts Images Music Calendar
- 92. @chiuki@chiuki ContentProvider Internal data (unless you need SQLite interface)
- 97. Case study
- 99. @chiuki
- 103. Summary
- 104. @chiuki@chiuki Summary Hello World Layouts Resource Folders Activity Lifecycle Intents & Components Case Study