android widget is nothing how user interface done with device, for example textbox, button.
Android Button
- Android Button are push-button. The android.widget.Button is subclass of TextView class and CompoundButton is the subclass of Button class.different types of buttons in android such as RadioButton, ToggleButton, CompoundButton.
example,
<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/editText2"
android:layout_centerHorizontal="true"
android:layout_marginTop="109dp"
android:text="ADD"
tools:layout_editor_absoluteX="148dp"
tools:layout_editor_absoluteY="266dp" />
various properties for button like id, width, height, position, margin, text, layout . you can also switch to design view to more clear to how button is looking
Android Toast
- display information for the short period of time. A toast contains message to be displayed quickly and disappears after sometime.example,
Toast.makeText(getApplicationContext(),"Hello Mayur",Toast.LENGTH_SHORT).show();
Custom Toast
customize the toast, such as we can display image on the toast
example,
Toast toast = new Toast(getApplicationContext());
toast.setDuration(Toast.LENGTH_SHORT);
toast.setGravity(Gravity.CENTER_VERTICAL, 0, 0);
toast.setView(layout);//setting the view of custom toast layout
toast.show();
ToggleButton
It has two states ON/OFF.
example,
<ToggleButton
android:id="@+id/toggleButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="8dp"
android:layout_marginTop="80dp"
android:text="ToggleButton"
android:textOff="Off"
android:textOn="On"
app:layout_constraintEnd_toStartOf="@+id/toggleButton2"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
here you can set text for on off both condition for example, notification on or off
CheckBox
to check on specific box, useful in filter, searching
example,
<CheckBox
android:id="@+id/checkBox"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="144dp"
android:layout_marginTop="68dp"
android:text="Pizza"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
this widget has also similar property like width, margin, layout
AlertDialog
it displays a alert dialog containing the message with OK and Cancel buttons.
closeButton = (Button) findViewById(R.id.button);
builder = new AlertDialog.Builder(this);
closeButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
builder.setMessage(R.string.dialog_message) .setTitle(R.string.dialog_title);
builder.setMessage("Do you want to close this application ?")
.setCancelable(false)
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
finish();
Toast.makeText(getApplicationContext(),"you choose yes action for alertbox",
Toast.LENGTH_SHORT).show();
}
})
.setNegativeButton("No", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// Action for 'NO' Button
dialog.cancel();
Toast.makeText(getApplicationContext(),"you choose no action for alertbox",
Toast.LENGTH_SHORT).show();
}
});
//Creating dialog box
AlertDialog alert = builder.create();
//Setting the title manually
alert.setTitle("trial message");
alert.show();
}
});
Spinner
Spinner displays the multiple options, but only one can be selected at a time.
its same to dropdown box
<Spinner
android:id="@+id/spinner"
android:layout_width="149dp"
android:layout_height="40dp"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.502"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.498" />
in above spinner add item from activity
AutoCompleteTextView
- when user type some suggestion comes<AutoCompleteTextView
android:id="@+id/autoCompleteTextView"
android:layout_width="200dp"
android:layout_height="wrap_content"
android:layout_marginLeft="92dp"
android:layout_marginTop="144dp"
android:text=""
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
add array string into activity which fetch suggestion into above textview
String[] language ={"html","php","js","jquery","ajax","mysql","sqlite"};
RatingBar
RatingBar displays the rating bar.
<RatingBar
android:id="@+id/ratingBar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="72dp"
android:layout_marginTop="60dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
DatePicker
Datepicker displays the datepicker dialog that can be used to pick the date.
<DatePicker
android:id="@+id/datePicker"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/textView1"
android:layout_centerHorizontal="true"
android:layout_marginBottom="36dp" />
to pick date from calender use this widget
TimePicker
to pick the time.
<TimePicker
android:id="@+id/timePicker"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/textView1"
android:layout_centerHorizontal="true"
android:layout_marginBottom="36dp" />
ProgressBar
ProgressBar displays progress task example downloading file, analyzing status of work, updating
directly add in activity
progressBar = new ProgressDialog(v.getContext());
progressBar.setCancelable(true);
progressBar.setMessage("File downloading ...");
progressBar.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
progressBar.setProgress(0);
progressBar.setMax(100);
progressBar.show();
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