Activity related APIs (public class android.app.Activity)
-- public void startActivity(Intent intent)
-- public void startActivityForResult(Intent intent, int requestCode)
-- public void finish()
-- public void finishActivity(int requestCode)
-- public final void setResult(int resultCode)
-- public final void setResult(int resultCode, Intent data)
-- public void setContentView(int layoutResID)
-- public View findViewById(int id)
-- public Object getSystemService(String name)

Service related APIs (public class android.app.Service)
-- public ComponentName startService(Intent intent)
-- public boolean bindService(Intent intent, ServiceConnection conn, int flags)
-- public abstract IBinder onBind(Intent intent)
-- public final void stopSelf()
-- public final void stopSelf(int startId)
-- public final void stopSelfResult(int startId)
-- public boolean stopService(Intent name)
-- public void unbindService(ServiceConnection conn)

BroadcastReceiver related APIs (base class: public abstract class android.content.Context)
-- public Intent registerReceiver(BroadcastReceiver rcv, IntentFilter filter)
-- public Intent registerReceiver(BroadcastReceiver rcv, IntentFilter filter, String permission, Handler scheduler)
-- public void unRegisterReceiver(BroadcastReceiver rcv)
-- public void sendBroadcast(Intent msg)
-- public void sendBroadcast(Intent msg, String permission)
-- public void sendOrderedBroadcast(Intent msg, String permission)
-- pubilic void sendOrderedBroadcast(Intent intent, String receiverPermission, BroadcastReceiver resultReceiver, Handler scheduler, int initial code, String initialData, Bundle initialExtras)
-- public void sendStickyBroadcast(Intent intent)
-- public void sendStickyBroadcast(Intent intent, String receiverPermission, BroadcastReceiver resultReceiver, Handler scheduler, int initial code, String initialData, Bundle initialExtras)


GUI widgets related APIs (base class: public class android.view.View)
-- public void setOnClickListener(View.onClickListener listener)
-- public void setOnLongClickListener(View.onLongClickListener listener)
-- public void setOnTouchListener(View.onTouchListener listener)
-- public void setOnCreateContextMenuListener(View.OnCreateContextMenuListener l)
-- public void setOnDragListener(View.OnDragListener l)
-- public void setOnHoverListenert(View.OnHoverListener l)
-- public void setOnKeyListener(View.OnKeyListener l)

Location sensing related APIs (class: public class android.location.LocationManager)
-- public void requestLocationUpdate(String provider, long minTime, float minDistance, LocationListener listener)
-- public void removeUpdates(LocationListener listener)
-- public boolean enableMyLocation() (Google maps API in MyLocationOverlay class)
-- public void disableMyLocation() (Google maps API in MyLocationOverlay class)
-- public List<String> getProviders(boolean enabledOnly)
-- public List<String> getProviders(Criteria criteria, boolean enabledOnly)
-- public LocationProvider getProvider(String name)
-- public List<String> getAllProviders()
-- public String getBestProvider(Criteria criteria, boolean enabledOnly)
-- public boolean isProviderEnabled(String providerName)
-- public Location getLastKnownLocation(String provider)
-- public com.google.android.maps.GeoPoint(int latitude, int longitude)
-- public boolean com.google.android.maps.GeoPoint.equals(GeoPoint p1, GeoPoint p2)
-- public String com.google.android.maps.GeoPoint.toString()
-- public int com.google.android.maps.GeoPoint.hashCode()
-- public int com.google.android.maps.GeoPoint.getLatitudeE6()
-- public int com.google.android.maps.GeoPoint.getLongitudeE6()
-- public List<Object> com.google.android.maps.MapView.getOverlays()


Wake lock related APIs (class: public class android.os.PowerManager (and WakeLock))
-- public WakeLock newWakeLock(int levalAndFlags, String tag)
-- public void acquire()
-- public void release()
-- public void setKeepScreenOn(boolean keepScreenOn)

Asynchronous task and timer task related APIs (class: public class android.os.AsyncTask, java.util.TimerTask)
-- public final AsyncTask<Params, Progress, Result> execute (Params... params)
-- public void schedule(TimerTask task, long period)
-- public void schedule(TimerTask task, long delay, long period)
-- public void schedule(TimerTask task, Date when)
-- public void schedule(TimerTask task, long delay)

Other APIs
-- public void android.widget.TabHost.ensureTabHost()
-- public Object android.content.ContextWrapper.getSystemService(String name)
-- public android.content.Intent(Context packageContext, Class<?> cls)
-- public T android.content.Intent.getParcelableExtra(String name)
-- public Intent android.content.Intent.setClass(Context packageContext, Class<?> cls)
-- public Cursor android.database.sqlite.SQLiteDatabase.query(String table, String[] columns, String selection, String[] selectionArgs, String groupBy, String having, String orderBy, String limit)
-- public Cursor android.database.sqlite.SQLiteDatabase.query(boolean distinct, String table, String[] columns, String selection, String[] selectionArgs, String groupBy, String having, String orderBy, String limit, CancellationSignal cancellationSignal)
-- public Cursor android.database.sqlite.SQLiteDatabase.query(String table, String[] columns, String selection, String[] selectionArgs, String groupBy, String having, String orderBy)
-- public Cursor android.database.sqlite.SQLiteDatabase.query(boolean distinct, String table, String[] columns, String selection, String[] selectionArgs, String groupBy, String having, String orderBy)
-- public SharedPreference android.preference.PreferenceManager.getSharedPreference()
-- public static SharedPreference android.preference.PreferenceManager.getDefaultSharedPreference(Context ctx)
-- public static int android.util.Log.d(String tag, String msg)
-- public static int android.util.Log.d(String tag, String msg, Throwable tr)
-- public static int android.util.Log.e(String tag, String msg)
-- public static int android.util.Log.e(String tag, String msg, Throwable tr)
-- public static int android.util.Log.i(String tag, String msg)
-- public static int android.util.Log.i(String tag, String msg, Throwable tr)
-- public static int android.util.Log.v(String tag, String msg)
-- public static int android.util.Log.v(String tag, String msg, Throwable tr)
-- public static int android.util.Log.w(String tag, String msg)
-- public static int android.util.Log.w(String tag, String msg, Throwable tr)
-- public CharSequence android.widget.TextView.getText()
-- public void android.widget.TextView. setText(CharSquence text)
-- public Toast android.widget.Toast.makeText(Context ctx)
-- public Toast android.widget.Toast.makeText(Context ctx, CharSequence text)
-- public android.internal.app.AlertContorller$AlertParams(Context ctx)