July 20,2016
Today i come to know about the working of Toggle Buttons,Check Box and AlertBox.
Android ToggleButton
Android Toggle Button can be used to display checked/unchecked (On/Off) state on the button.
It is beneficial if user have to change the setting between two states. It can be used to On/Off Sound, Wifi, Bluetooth etc.
Android ToggleButton class
ToggleButton class provides the facility of creating the toggle button.
XML Attributes of ToggleButton class
The 3 XML attributes of ToggleButton class.
| XML Attribute | Description |
|---|---|
| android:disabledAlpha | The alpha to apply to the indicator when disabled. |
| android:textOff | The text for the button when it is not checked. |
| android:textOn | The text for the button when it is checked. |
Methods of ToggleButton class
The widely used methods of ToggleButton class are given below.
| Method | Description |
|---|---|
| CharSequence getTextOff() | Returns the text when button is not in the checked state. |
| CharSequence getTextOn() | Returns the text for when button is in the checked state. |
| void setChecked(boolean checked) | Changes the checked state of this button. |
Android CheckBox
Android CheckBox is a type of two state button either checked or unchecked.
There can be a lot of usage of checkboxes. For example, it can be used to know the hobby of the user, activate/deactivate the specific action etc.
Android CheckBox class
The android.widget.CheckBox class provides the facility of creating the CheckBoxes.
Methods of CheckBox class
There are many inherited methods of View, TextView, and Button classes in the CheckBox class. Some of them are as follows:
| Method | Description |
|---|---|
| public boolean isChecked() | Returns true if it is checked otherwise false. |
| public void setChecked(boolean status) | Changes the state of the CheckBox. |
Android AlertDialog
Android AlertDialog can be used to display the dialog message with OK and Cancel buttons. It can be used to interrupt and ask the user about his/her choice to continue or discontinue.
Android AlertDialog is composed of three regions: title, content area and action buttons.
In order to make an alert dialog, you need to make an object of AlertDialogBuilder which an inner class of AlertDialog. Its syntax is given below
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this);
Now you have to set the positive (yes) or negative (no) button using the object of the AlertDialogBuilder class. Its syntax is
alertDialogBuilder.setPositiveButton(CharSequence text, DialogInterface.OnClickListener listener) alertDialogBuilder.setNegativeButton(CharSequence text, DialogInterface.OnClickListener listener)
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