android官方API之EditText

来源：https://developer.android.com/reference/android/widget/EditText

EditText

public class EditText 
extends TextView 

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

Known direct subclasses AutoCompleteTextView, ExtractEditText

Known indirect subclasses MultiAutoCompleteTextView

---

A user interface element for entering and modifying text. When you define an edit text widget, you must specify theR.styleable.TextView_inputType attribute. For example, for plain text input set inputType to "text":

<EditText android:id="@+id/plain_text_input" android:layout_height="wrap_content" android:layout_width="match_parent" android:inputType="text"/>Choosing the input type configures the keyboard type that is shown, acceptable characters, and appearance of the edit text. For example, if you want to accept a secret number, like a unique pin or serial number, you can set inputType to "numericPassword". An inputType of "numericPassword" results in an edit text that accepts numbers only, shows a numeric keyboard when focused, and masks the text that is entered for privacy.

See the Text Fields guide for examples of other R.styleable.TextView_inputType settings.

You also can receive callbacks as a user changes text by adding a TextWatcher to the edit text. This is useful when you want to add auto-save functionality as changes are made, or validate the format of user input, for example. You add a text watcher using the TextView.addTextChangedListener(TextWatcher) method.

This widget does not support auto-sizing text.

XML attributes

See EditText Attributes, TextView Attributes, View Attributes

Summary

Inherited XML attributes
From class android.widget.TextView
From class android.view.View

Inherited constants
From class android.widget.TextView
From class android.view.View

Inherited fields
From class android.view.View

Public constructors
EditText(Context context)
EditText(Context context, AttributeSet attrs)
EditText(Context context, AttributeSet attrs, int defStyleAttr)
EditText(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes)

Public methods
void	extendSelection(int index) Convenience for Selection.extendSelection(Spannable, int).
CharSequence	getAccessibilityClassName() Return the class name of this object to be used for accessibility purposes.
boolean	getFreezesText() Return whether this text view is including its entire text contents in frozen icicles.
Editable	getText() Return the text that TextView is displaying.
void	selectAll() Convenience for Selection.selectAll(Spannable).
void	setEllipsize(TextUtils.TruncateAt ellipsis) Causes words in the text that are longer than the view's width to be ellipsized instead of broken in the middle.
void	setSelection(int start, int stop) Convenience for Selection.setSelection(Spannable, int, int).
void	setSelection(int index) Convenience for Selection.setSelection(Spannable, int).
void	setText(CharSequence text, TextView.BufferType type) Sets the text to be displayed and the TextView.BufferType.

Protected methods
boolean	getDefaultEditable() Subclasses override this to specify that they have a KeyListener by default even if not specifically called for in the XML options.
MovementMethod	getDefaultMovementMethod() Subclasses override this to specify a default movement method.

Inherited methods
From class android.widget.TextView
From class android.view.View
From class java.lang.Object
From interface android.view.ViewTreeObserver.OnPreDrawListener
From interface android.graphics.drawable.Drawable.Callback
From interface android.view.KeyEvent.Callback
From interface android.view.accessibility.AccessibilityEventSource

Public constructors

EditText

added in API level 1

public EditText (Context context)

Parameters
context	Context

EditText

added in API level 1

public EditText (Context context, AttributeSet attrs)

Parameters
context	Context
attrs	AttributeSet

EditText

added in API level 1

public EditText (Context context, AttributeSet attrs, int defStyleAttr)

Parameters
context	Context
attrs	AttributeSet
defStyleAttr	int

EditText

added in API level 21

public EditText (Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes)

Parameters
context	Context
attrs	AttributeSet
defStyleAttr	int
defStyleRes	int

Public methods

extendSelection

added in API level 1

public void extendSelection (int index)

Convenience for Selection.extendSelection(Spannable, int).

Parameters
index	int

getAccessibilityClassName

added in API level 23

public CharSequence getAccessibilityClassName ()

Return the class name of this object to be used for accessibility purposes. Subclasses should only override this if they are implementing something that should be seen as a completely new class of view when used by accessibility, unrelated to the class it is deriving from. This is used to fill in AccessibilityNodeInfo.setClassName.

Returns
CharSequence

getFreezesText

added in API level 1

public boolean getFreezesText ()

Return whether this text view is including its entire text contents in frozen icicles. For EditText it always returns true.

Returns
boolean	Returns true if text is included, false if it isn't.

getText

added in API level 1

public Editable getText ()

Return the text that TextView is displaying. If setText(CharSequence) was called with an argument of BufferType.SPANNABLE or BufferType.EDITABLE, you can cast the return value from this method to Spannable or Editable, respectively.

The content of the return value should not be modified. If you want a modifiable one, you should make your own copy first.

Returns
Editable	The text displayed by the text view.

selectAll

added in API level 1

public void selectAll ()

Convenience for Selection.selectAll(Spannable).

setEllipsize

added in API level 1

public void setEllipsize (TextUtils.TruncateAt ellipsis)

Causes words in the text that are longer than the view's width to be ellipsized instead of broken in the middle. TextUtils.TruncateAt#MARQUEE is not supported.

Parameters
ellipsis	TextUtils.TruncateAt: Type of ellipsis to be applied.

Throws
IllegalArgumentException	When the value of ellipsis parameter is TextUtils.TruncateAt.MARQUEE.

See also:

• TextView.setEllipsize(TextUtils.TruncateAt)

setSelection

added in API level 1

public void setSelection (int start, int stop)

Convenience for Selection.setSelection(Spannable, int, int).

Parameters
start	int
stop	int

setSelection

added in API level 1

public void setSelection (int index)

Convenience for Selection.setSelection(Spannable, int).

Parameters
index	int

setText

added in API level 1

public void setText (CharSequence text, TextView.BufferType type)

Sets the text to be displayed and the TextView.BufferType.

When required, TextView will use Spannable.Factory to create final or intermediate Spannables. Likewise it will useEditable.Factory to create final or intermediate Editables.

Parameters
text	CharSequence: text to be displayed
type	TextView.BufferType: a TextView.BufferType which defines whether the text is stored as a static text, styleable/spannable text, or editable text

Protected methods

getDefaultEditable

added in API level 1

protected boolean getDefaultEditable ()

Subclasses override this to specify that they have a KeyListener by default even if not specifically called for in the XML options.

Returns
boolean

getDefaultMovementMethod

added in API level 1

protected MovementMethod getDefaultMovementMethod ()

Subclasses override this to specify a default movement method.

Returns
MovementMethod