مواضيع ٢

LinearLayout : is a view group that aligns all children in a single direction, vertically or horizontally.

RelativeLayout: is a view group that displays child views in relative positions.

TableLayout: is a view that groups views into rows and columns

FrameLayout: is a placeholder on screen that you can use to display a single view.

ListView: is a view group that displays a list of scrollable items.

GridView: is a ViewGroup that displays items in a two-dimensional, scrollable grid.

ConstraintLayout: is a ViewGroup which allows you to position and size widgets in a flexible way.

TextView: This control is used to display text to the user.

EditText: is a predefined subclass of TextView that includes rich editing capabilities.

AutoCompleteTextView: is a view that is similar to EditText, except that it shows a list of completion suggestions automatically while the user is typing.

Button: A push-button that can be pressed, or clicked, by the user to perform an action.

CheckBox: An on/off switch that can be toggled by the user. You should use check box when presenting users with a group of selectable options that are not mutually exclusive.

ToggleButton: An on/off button with a light indicator

RadioButton: has two states: either checked or unchecked.

RadioGroup: is used to group together one or more RadioButtons.

ProgressBar: The view provides visual feedback about some ongoing tasks, such as when you are performing a task in the background.

Spinner: A drop-down list that allows users to select one value from a set.

TimePicker: The view enables users to select a time of the day, in either 24-hour mode or AM/PM mode.

DatePicker: The view enables users to select a date of the day.

onDown(): Notifies when a tap down event occurs

onFling(): Notifies when a tap down, movement, and matching up event occurs onLongPress() Notifies when a long press occurs

onScroll(): Notifies when a scroll occurs

onShowPress(): Notifies when a tap down occurs before any movement or release

onSingleTapUp(): Notifies when a tap up event occurs

int getAction(): Inspect the action value of this event..

ClipData getClipData(): Returns the ClipData object sent to the system as part of the call to startDrag().

boolean getResult(): Returns an indication of the result of the drag and drop operation.

String toString(): Returns a string representation of this DragEvent object.

float distanceTo(Location dest): Returns the approximate distance in meters between this location and the given location.

float getAccuracy(): Get the estimated accuracy of this location, in meters.

double getAltitude(): Get the altitude if available, in meters above sea level.

float getBearing(): Get the bearing, in degrees.

double getLatitude(): Get the latitude, in degrees.

double getLongitude(): Get the longitude, in degrees.

boolean hasBearing(): True if this location has a bearing.

boolean hasSpeed(): True if this location has a speed.

void reset(): Clears the contents of the location.

void setAccuracy(float accuracy): Set the estimated accuracy of this location, meters.

void setAltitude(double altitude): Set the altitude, in meters above sea level.

void setBearing(float bearing): Set the bearing, in degrees.

void setLatitude(double latitude): Set the latitude, in degrees.

Before you can begin debugging, you need to prepare as follows:

Install LLDB

Enable debugging on your device

Run a debuggable build variant