Android之EditText 为密码输入框时,密码的显示与隐藏

实现输入框密码文本的显示与隐藏有两种,一种是通过直接改变android:inputType,一种是通过改变android.text.method.TransformationMethod


方式一:改变android:inputType的值


实现代码如下:

	
	/**
	 * 密码显示或隐藏 (切换)
	 */
	private void showOrHide(EditText etPassword){
		//记住光标开始的位置
		int pos = etPassword.getSelectionStart();
		if(etPassword.getInputType()!= (InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_PASSWORD)){//隐藏密码
			etPassword.setInputType(InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_PASSWORD);
		}else{//显示密码
			etPassword.setInputType(InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD);
		}
		etPassword.setSelection(pos);
		
	}
	

参见:android:inputType

对应的值与描述如下:

Constant Value Description
none 0x00000000 There is no content type. The text is not editable.
text 0x00000001 Just plain old text. Corresponds to TYPE_CLASS_TEXT | TYPE_TEXT_VARIATION_NORMAL.
textCapCharacters 0x00001001 Can be combined with text and its variations to request capitalization of all characters. Corresponds to TYPE_TEXT_FLAG_CAP_CHARACTERS.
textCapWords 0x00002001 Can be combined with text and its variations to request capitalization of the first character of every word. Corresponds to TYPE_TEXT_FLAG_CAP_WORDS.
textCapSentences 0x00004001 Can be combined with text and its variations to request capitalization of the first character of every sentence. Corresponds to TYPE_TEXT_FLAG_CAP_SENTENCES.
textAutoCorrect 0x00008001 Can be combined with text and its variations to request auto-correction of text being input. Corresponds to TYPE_TEXT_FLAG_AUTO_CORRECT.
textAutoComplete 0x00010001 Can be combined with text and its variations to specify that this field will be doing its own auto-completion and talking with the input method appropriately. Corresponds toTYPE_TEXT_FLAG_AUTO_COMPLETE.
textMultiLine 0x00020001 Can be combined with text and its variations to allow multiple lines of text in the field. If this flag is not set, the text field will be constrained to a single line. Corresponds toTYPE_TEXT_FLAG_MULTI_LINE.
textImeMultiLine 0x00040001 Can be combined with text and its variations to indicate that though the regular text view should not be multiple lines, the IME should provide multiple lines if it can. Corresponds toTYPE_TEXT_FLAG_IME_MULTI_LINE.
textNoSuggestions 0x00080001 Can be combined with text and its variations to indicate that the IME should not show any dictionary-based word suggestions. Corresponds to TYPE_TEXT_FLAG_NO_SUGGESTIONS.
textUri 0x00000011 Text that will be used as a URI. Corresponds to TYPE_CLASS_TEXT | TYPE_TEXT_VARIATION_URI.
textEmailAddress 0x00000021 Text that will be used as an e-mail address. Corresponds to TYPE_CLASS_TEXT |TYPE_TEXT_VARIATION_EMAIL_ADDRESS.
textEmailSubject 0x00000031 Text that is being supplied as the subject of an e-mail. Corresponds to TYPE_CLASS_TEXT |TYPE_TEXT_VARIATION_EMAIL_SUBJECT.
textShortMessage 0x00000041 Text that is the content of a short message. Corresponds to TYPE_CLASS_TEXT |TYPE_TEXT_VARIATION_SHORT_MESSAGE.
textLongMessage 0x00000051 Text that is the content of a long message. Corresponds to TYPE_CLASS_TEXT |TYPE_TEXT_VARIATION_LONG_MESSAGE.
textPersonName 0x00000061 Text that is the name of a person. Corresponds to TYPE_CLASS_TEXT |TYPE_TEXT_VARIATION_PERSON_NAME.
textPostalAddress 0x00000071 Text that is being supplied as a postal mailing address. Corresponds to TYPE_CLASS_TEXT |TYPE_TEXT_VARIATION_POSTAL_ADDRESS.
textPassword 0x00000081 Text that is a password. Corresponds to TYPE_CLASS_TEXT | TYPE_TEXT_VARIATION_PASSWORD.
textVisiblePassword 0x00000091 Text that is a password that should be visible. Corresponds to TYPE_CLASS_TEXT |TYPE_TEXT_VARIATION_VISIBLE_PASSWORD.
textWebEditText 0x000000a1 Text that is being supplied as text in a web form. Corresponds to TYPE_CLASS_TEXT |TYPE_TEXT_VARIATION_WEB_EDIT_TEXT.
textFilter 0x000000b1 Text that is filtering some other data. Corresponds to TYPE_CLASS_TEXT |TYPE_TEXT_VARIATION_FILTER.
textPhonetic 0x000000c1 Text that is for phonetic pronunciation, such as a phonetic name field in a contact entry. Corresponds to TYPE_CLASS_TEXT | TYPE_TEXT_VARIATION_PHONETIC.
textWebEmailAddress 0x000000d1 Text that will be used as an e-mail address on a web form. Corresponds to TYPE_CLASS_TEXT |TYPE_TEXT_VARIATION_WEB_EMAIL_ADDRESS.
textWebPassword 0x000000e1 Text that will be used as a password on a web form. Corresponds to TYPE_CLASS_TEXT |TYPE_TEXT_VARIATION_WEB_PASSWORD.
number 0x00000002 A numeric only field. Corresponds to TYPE_CLASS_NUMBER | TYPE_NUMBER_VARIATION_NORMAL.
numberSigned 0x00001002 Can be combined with number and its other options to allow a signed number. Corresponds toTYPE_CLASS_NUMBER | TYPE_NUMBER_FLAG_SIGNED.
numberDecimal 0x00002002 Can be combined with number and its other options to allow a decimal (fractional) number. Corresponds to TYPE_CLASS_NUMBER | TYPE_NUMBER_FLAG_DECIMAL.
numberPassword 0x00000012 A numeric password field. Corresponds to TYPE_CLASS_NUMBER |TYPE_NUMBER_VARIATION_PASSWORD.
phone 0x00000003 For entering a phone number. Corresponds to TYPE_CLASS_PHONE.
datetime 0x00000004 For entering a date and time. Corresponds to TYPE_CLASS_DATETIME |TYPE_DATETIME_VARIATION_NORMAL.
date 0x00000014 For entering a date. Corresponds to TYPE_CLASS_DATETIME | TYPE_DATETIME_VARIATION_DATE.
time 0x00000024 For entering a time. Corresponds to TYPE_CLASS_DATETIME | TYPE_DATETIME_VARIATION_TIME.

This corresponds to the global attribute resource symbol inputType.

方式二:改变android.text.method.TransformationMethod 的值。


实现代码如下:

	
	/**
	 * 显示或隐藏
	 * @param isShow 
	 */
	private void showOrHide(boolean isShow){
		//记住光标开始的位置
		int pos = etPassword.getSelectionStart();
		if(isShow){
			etPassword.setTransformationMethod(HideReturnsTransformationMethod.getInstance());
		}else{
			etPassword.setTransformationMethod(PasswordTransformationMethod.getInstance());
			
		}
		etPassword.setSelection(pos);
	}

参见:android.text.method.TransformationMethod

 

posted @ 2015-12-15 16:24  Jenly  阅读(1615)  评论(0编辑  收藏