Download - Intro to Android for iOS developers

Intro to Androidfor iOS developers

Chiu-Ki Chan@chiuki

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Hello WorldLayouts

Intents & Components

Hello World

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ViewController

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xib

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IBOutlet

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Center<TextView android:id="@+id/text" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" />

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Button<Button android:id="@+id/text" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:text="@string/add" />

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LinearLayout

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LinearLayout<LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center" android:orientation="vertical" > <TextView android:id="@+id/count" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="128sp" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/add" android:onClick="add" /></LinearLayout>

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IBAction<LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center" android:orientation="vertical" > <TextView android:id="@+id/count" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="128sp" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/add" android:onClick="add" /></LinearLayout>

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IBActionpublic 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"

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Update viewpublic 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)); }}

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RelativeLayout

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<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>

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<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>

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<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>

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Device Preview

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Bigger text on tablets

Resource Folders

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textSize<TextView android:id="@+id/count" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="128sp" />

res/layout/activity_main.xml

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res/values/dimens.xml<TextView android:id="@+id/count" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="@dimen/counter_size" />


<dimen name="counter_size" value="128sp" />

res/values/dimens.xml

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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/values/dimens.xml

res/values-sw600dp/dimens.xml

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Resource Folders

Type Variation

layoutvalues

drawablemenu

Language & Region: en, fr, fr-rCA, jaScreen size: small, large, sw600dp, h400dpScreen orientation: port, landScreen density: ldpi, mdpi, hdpi, xhdpi, nodpi, tvdpiPlatform version: v4, v11, v14UI mode: car, desk, television, appliance

http://developer.android.com/guide/topics/resources/providing-resources.html



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Resource Folders

Type Variation

layoutvalues

drawablemenu



res/values-sw600dp/dimens.xml



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Resource Folders

Type Variation

layoutvalues

drawablemenu



res/drawable-hdpi/ic_launcher.png



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Resource Folders

Type Variation

layoutvalues

drawablemenu



res/drawable-hdpi/ic_launcher.png @2x



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Resource Folders

Type Variation

layoutvalues

drawablemenu



res/layout-ja/name.xml



Activity Lifecycle

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onCreate()

Activity Lifecycle

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onCreate() viewDidLoad:

Activity Lifecycle

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onStart()

Activity Lifecycle

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onStart()onResume()

Activity Lifecycle

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onStart()onResume()

viewWillAppear:viewDidAppear:

Activity Lifecycle

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onStart()onResume()


onPause()

Activity Lifecycle

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onStart()onResume()


onPause()onStop()

Activity Lifecycle

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onStart()onResume()


onPause()onStop()

viewWillDisappear:viewDidDisappear:

Activity Lifecycle

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onStart()onResume()


onPause()onStop()


onDestroy()

Activity Lifecycle

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onStart()onResume()


onPause()onStop()


onDestroy() viewDidUnload:

Activity Lifecycle

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Visibility

More Activities

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startActivity (explicit)Intent intent = new Intent(this, NumberActivity.class);intent.putExtra("count", count);startActivity(intent);

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startActivity (implicit)Intent intent = new Intent(Intent.ACTION_VIEW);intent.setData(Uri.parse("http://twitter.com/chiuki"));startActivity(intent);

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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

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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


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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


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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


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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

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startActivityForResultprivate 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"); }}

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startActivityForResultprivate static final int REQUEST_CODE_CAMERA = 1;Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);startActivityForResult(intent, REQUEST_CODE_CAMERA);


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Providing ResultIntent data = new Intent();data.putExtra("data", bitmap);setResult(RESULT_OK, data);finish();


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Intent DataIntent data = new Intent();data.putExtra("data", bitmap);setResult(RESULT_OK, data);finish();


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Result CodeIntent data = new Intent();data.putExtra("data", bitmap);setResult(RESULT_OK, data);finish();


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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);

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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/*");

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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);

Beyond Activities

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Service BroadcastReceiver

ContentProvider Notification

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Service

Look ma, no UI!

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Service

Long-running

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BroadcastReceiver

Respond

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BroadcastReceiver

Respond

Battery low

Wifi connected

Incoming SMSApp installed

Screen off

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ContentProvider

Provide data to other apps

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ContentProvider

Provide data to other apps

Contacts

Images Music

Calendar

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ContentProvider

Internal data(unless you need SQLite interface)

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Notification

Notify

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Notify

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Notification

Communicate with background Service

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Background Service

Case study

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Email Outbox

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Notification

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AlarmService

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Connectivity change

Summary

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Summary

Hello WorldLayoutsResource FoldersActivity LifecycleIntents & ComponentsCase Study

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Thank you!

http://eepurl.com/lR5uDhttp://blog.sqisland.comhttp://twitter.com/chiuki

http://eepurl.com/lR5uD

http://eepurl.com/lR5uD

http://blog.sqisland.com/

http://blog.sqisland.com/

http://twitter.com/chiuki

http://twitter.com/chiuki

Download - Intro to Android for iOS developers

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