App basic

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App basic

  1. 1. Android App Basics
  2. 2. l A First Example: Advent Devotions
  3. 3. l UML Class Diagram
  4. 4. Two Activities in Advent Devotions displays a single AdventDevos displays the Devo l l l calendar of dates devotion • Intent myIntent = new Intent(AdventDevos.this, Devo.class); • myIntent.putExtra("ButtonNum", "" + index); • startActivity(myIntent);
  5. 5. l l Two Activities in Advent Devotions AdventDevos displays the calendar of dates l Devo displays a single devotion • Bundle extras = getIntent().getExtras(); • String value = extras.getString("ButtonNum"); • Integer buttonNum = Integer.valueOf(value);
  6. 6. l l Launching an Intent you didn’t write Devos has button to URL l Browser launched Intent i = new Intent(Intent.ACTION_VIEW, • Uri.parse("http://www.biblegateway.com/passage/?search="+ • passage +"&version=NIV")); • startActivity(i); l
  7. 7. l l Android Activity “An activity is a single, focused thing that the user can do. Almost all activities interact with the user, so the Activity class takes care of creating a window for you in which you can place your UI with setContentView(View).” • http://developer.android.com/reference/android/app/ • Activity.html#ActivityLifecycle
  8. 8. l AndroidManifest.xml • • <?xml version="1.0" encoding="utf-8"?> Each upload to Market requires versionCode increment • <manifest xmlns:android="http://schemas.android.com/apk/res/android" • package="com.simexusa.adventdevotions" • android:versionCode="2" • Specifies icon for launching app • android:versionName="1.0"> • <application android:icon="@drawable/star" android:label="@string/app_name" android:debu • <activity android:name=".AdventDevos" • android:label="@string/app_name"> • Specifies icon for launching app • <intent-filter> • <action android:name="android.intent.action.MAIN" /> • <category android:name="android.intent.category.LAUNCHER" /> • </intent-filter> • </activity> • <activity android:name=".Devo"/> • </application> • Specifies activity to be launched at startup • <uses-sdk android:minSdkVersion="3" /> • <uses-permission android:name="android.permission.INTERNET" /> • </manifest> • Security permissions requested from user on install
  9. 9. l Look around the files
  10. 10. l l Layouts and Resources See main.xml and devo.xml l Activity associates with layout xml file using setContentView(R.layout.main); or setContentView(R.layout.devo); in onCreate() l Note TableLayout and TableRow similar to <table> and <tr> in html l Note use of dimen (see values/dimens.xml) and color (see values/colors.xml) l Also see strings.xml
  11. 11. l l l l l l l l l l l l l l l l l l l l l main.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" android:background="@color/background"> <TableLayout android:layout_width="wrap_content" android:id="@+id/TableLayout01" android:layout_height="wrap_content"> <TableRow android:paddingTop="8px"> <Button android:text="Nov. 29" android:id="@+id/Button01" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="@dimen/button_width"></Button> <Button android:text="Nov. 30" android:id="@+id/Button02" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="@dimen/button_width"></Button> <Button android:text="Dec. 1" android:id="@+id/Button03" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="@dimen/button_width"></Button> <Button android:text="Dec. 2" android:id="@+id/Button04" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="@dimen/button_width"></Button> </TableRow> …
  12. 12. l l l l l l l l l l l l l l l l l l l l l l l l l devo.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" android:gravity="center_horizontal" android:background="@color/background"> <TextView android:text="Date" android:id="@+id/Date" android:layout_width="wrap_content" android:layout_height="wrap_content" android:gravity="center_horizontal" android:textStyle="italic" android:textSize="@dimen/reference_width" android:typeface="serif" android:textColor="@color/text"></TextView> <TextView android:text="Title" android:id="@+id/Title" android:layout_width="wrap_content" android:layout_height="wrap_content" android:gravity="center_horizontal" android:textStyle="bold" android:textSize="@dimen/reference_width" android:typeface="serif" android:textColor="@color/text"></TextView> <Button android:text="Read Scripture" android:id="@+id/ButtonScripture" android:layout_width="wrap_content" android:layout_height="wrap_content" android:gravity="center_horizontal" android:textSize="@dimen/reference_width"></Button> <ScrollView android:id="@+id/ScrollView01" android:layout_height="fill_parent" android:layout_width="fill_parent"> <TextView android:text="Body" android:id="@+id/Body" android:layout_width="wrap_content" android:layout_height="wrap_content" android:gravity="left" android:textSize="@dimen/reference_width" android:typeface="serif" android:textColor="@color/text"></TextView>
  13. 13. l dimens.xml <?xml version="1.0" encoding="utf-8"?> <resources> <dimen name="button_width">17sp</dimen> <dimen name="reference_width">20sp</dimen> </resources> l l l l l • colors.xml <?xml version="1.0" encoding="utf-8"?> <resources> <color name="background">#AAFFFF99</color> <color name="text">#FF000000</color> </resources> l l l l l • strings.xml l l l l l <?xml version="1.0" encoding="utf-8"?> <resources> <string name="hello">Hello World, AdventDevos!</string> <string name="app_name">Advent Devotions</string> </resources>

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