Download android:layout_width="fill_parent

Introducing
Activity and Intent
1
Memory
TextView
ListView
2
LinearLayout,
weight=2
LinearLayout,
weight=1
How to create xml file
Right click
(on the
folder)
3
The menu.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">
<LinearLayout android:orientation="vertical"
android:layout_width="fill_parent" android:layout_height="fill_parent"
android:layout_weight="2">
<TextView android:id="@+id/TextView01" android:layout_width="wrap_content”
android:layout_height="wrap_content“ android:textSize="@dimen/screen_title_size"
android:text="@string/menu" android:layout_gravity="center"
android:shadowColor="@android:color/white"
android:textColor="@color/title_color" />
</LinearLayout>
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The menu.xml cont.
<LinearLayout android:orientation="vertical"
android:layout_width="fill_parent" android:layout_height="fill_parent“ android:layout_weight="1">
<ListView android:layout_height="wrap_content" android:id="@+id/list_menu"
android:layout_width="fill_parent" android:layout_gravity="center_horizontal"
android:divider="@drawable/divider"
android:listSelector="@drawable/textured">
</ListView>
</LinearLayout>
</LinearLayout>
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The dimens.xml (in values folder)
<?xml version="1.0" encoding="utf-8"?>
<resources>
<dimen
name="logo_size">24pt</dimen>
<dimen
name="version_size">5pt</dimen>
<dimen
name="version_spacing">3pt</dimen>
<dimen
name="screen_title_size">16pt</dimen>
<dimen
name="menu_item_size">16pt</dimen>
<dimen
name="game_question_size">10pt</dimen>
<dimen
name="help_text_size">7pt</dimen>
<dimen
name="help_text_padding">20px</dimen>
</resources>
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The colors.xml (in values folder)
<?xml version="1.0" encoding="utf-8"?>
<resources>
<color
name="logo_color">#FFFF0F</color>
<color
name="version_color">#f0f0f0</color>
<color
name="version_bkgrd">#1a1a48</color>
<color
name="title_color">#f0f0f0</color>
<color
name="title_glow">#F00</color>
<color
name="menu_color">#FFFF0F</color>
<color
name="menu_glow">#F00</color>
<color
name="error_color">#F00</color>
</resources>
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How to create java file
Right click
(on the
folder)
8
How to override a method
Right click
on the code
pane
9
How to override a method cont.
Select the
method to
overridem
eg, onCreate
10
The strings.xml (in values folder)
<Resources>
….
<string name="menu">Memory</string>
<string name="menu_item_settings">Settings</string>
<string name="menu_item_play">Play Game</string>
<string name="menu_item_scores">View Scores</string>
<string name="menu_item_help">Help</string>
…
</Resources>
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Create ListView from resource
ListView menuList = (ListView) findViewById(R.id.list_menu);
String[] items = { getResources().getString(R.string.menu_item_play),
getResources().getString(R.string.menu_item_scores),
getResources().getString(R.string.menu_item_settings),
getResources().getString(R.string.menu_item_help) };
ArrayAdapter<String> adapt = new ArrayAdapter<String>
(this,R.layout.menu_item, items);
menuList.setAdapter(adapt);
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Starting an Activity class
public class Memory extends Activity {
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.menu);
ListView menuList = (ListView) findViewById(R.id.list_menu);
String[] items = { getResources().getString(R.string.menu_item_play),
getResources().getString(R.string.menu_item_scores),
getResources().getString(R.string.menu_item_settings),
getResources().getString(R.string.menu_item_help) };
ArrayAdapter<String> adapt = new ArrayAdapter<String>(this,R.layout.menu_item, items);
menuList.setAdapter(adapt);
menuList.setSelection(-1);
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Starting an Activity class
menuList.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View itemClicked, int position, long id)
{
// Note: if the list was built "by hand" the id could be used.
// As-is, though, each item has the same id
TextView textView = (TextView) itemClicked;
String strText = textView.getText().toString();
if (strText.equalsIgnoreCase(
getResources().getString(R.string.menu_item_play))) {
startActivity(new Intent(Memory.this, MemoryPlayGame.class));
} else if (strText.equalsIgnoreCase(getResources().getString(R.string.menu_item_help))) {
//
startActivity(new Intent(Memory.this, MemoryHelp.class));
}
}
});
}
}14
Include the Activity in the manifest
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.plearn" android:versionCode="1" android:versionName="1.0">
<uses-sdk android:minSdkVersion="8" />
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".Memory" 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=".PlayGame" android:label="@string/app_name">
</activity>
</application>
</manifest>
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