Android Widgets

Some Android Widgets

For each widget, only attributes and methods used for information access and modification are shown, not attributes used for styling and positioning.

TextView

java.lang.Object
   android.view.View
      android.widget.TextView

TextView Reference in Android Developer Website

XML data access attribute:
```
android:text
```

Java methods:

// Get text from widget.
textView1.getText( ).toString( );

// Set text in widget.
textView1.setText(s);

Button

java.lang.Object
   android.view.View
      android.widget.TextView
          android.widget.Button

Button Reference in Android Developer Website

XML data access attribute:
```
android:text
```

Java methods:

// Get text from widget.
textView1.getText( ).toString( );

// Set text in widget.
textView1.setText(s);

EditText

java.lang.Object
   android.view.View
      android.widget.TextView
          android.widget.EditText

EditText Reference in Android Developer Website

XML data access attribute:
```
android:inputText

android:text
```
The value we have seen for the attribute android:inputText is text.
See this reference on the Android Developer site for other inputText values.

Java methods:

// Get text from widget.
textView1.getText( ).toString( );

// Set text in widget.
textView1.setText(s);

Checkbox

java.lang.Object
   android.view.View
      android.widget.TextView
         android.widget.Button
            android.widget.CompoundButton
               android.widget.CheckBox

CheckBox Reference in Android Developer Website

XML data access attributes:
```
android:checked
android:text
```

Java methods:

// Check if checkbox is checked.
boolean flag = checkBox1.isChecked( );

// Set checkbox to checked (when boolVal == true)
// or to unchecked (when boolVal == false).
checkBox1.setChecked(boolVal);

Switch

java.lang.Object
   android.view.View
      android.widget.TextView
         android.widget.Button
            android.widget.CompoundButton
               android.widget.Switch

Switch Reference in Android Developer Website

XML data access attribute:
```
android:checked
```

Java methods:

// Check if checkbox is checked.
boolean flag = checkBox1.isChecked( );

// Set checkbox to checked (when boolVal == true)
// or to unchecked (when boolVal == false).
checkBox1.setChecked(boolVal);

RadioButton

java.lang.Object
   android.view.View
      android.widget.TextView
         android.widget.Button
            android.widget.CompoundButton
               android.widget.RadioButton

XML data access attribute:
```
android:checked
```

Java methods:

// Determine if checkbox is checked.
boolean flag = radioButton1.isChecked( );

// Set radio button to the inverse of its
// current state.
radioButton1.toggle( );

RadioButton Group

Radio buttons can be placed into radio button groups like the following. At a given time, only one radiobutton can be checked in a group.

<RadioGroup xmlns:
    android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">

    <RadioButton android:id="@+id/yes"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/no"
        android:onClick="onRadioButtonClicked"/>

    <RadioButton android:id="@+id/no"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/no"
        android:onClick="onRadioButtonClicked"/>

    <RadioButton android:id="@+id/maybe
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/maybe"
        android:onClick="onRadioButtonClicked"/>

</RadioGroup>