Customize the size of hint text in EditText in Android

Today, colleagues in the work encountered a problem, that is, the text in the EditText after the size, hint text because too long caused in the edittext can not complete display, so asked whether there is a separate option to set the hint text size. There is no introduction to this in the Internet. So I looked at the source of the next TextView (EditText inherited from TextView), found some clues, as follows:

publicfinal voidsetHint(CharSequence hint) {

mHint = TextUtils.stringOrSpannedString(hint);

if(mLayout != null) {

checkForRelayout();

}

if(mText.length() == 0) {

invalidate();

}

// Invalidate display list if hint is currently used

if(mEditor != null && mText.length() == 0&& mHint != null) {

mEditor.invalidateTextDisplayList();

}

}

At the beginning of the method is the conversion of the hint text. Since hint is a charsequence type, it is possible to add some custom properties, and we'll look at textutils.stringorspannedstring this method:

publicstaticCharSequence stringOrSpannedString(CharSequence source) {

if(source == null)

returnnull;

if(source instanceofSpannedString)

returnsource;

if(source instanceofSpanned)

returnnewSpannedString(source);

returnsource.toString();

}

So the question is, can we keep the custom properties of the text as long as the incoming hint is a spannedstring or spanned type? The answer is YES! Directly on the code:

EditText editText = (EditText) rootView.findViewById(R.id.et);

// 新建一个可以添加属性的文本对象

SpannableString ss = newSpannableString("喝酒就要喝一斤!");

// 新建一个属性对象,设置文字的大小

AbsoluteSizeSpan ass = newAbsoluteSizeSpan(8,true);

// 附加属性到文本

ss.setSpan(ass, 0, ss.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

// 设置hint

editText.setHint(newSpannedString(ss)); // 一定要进行转换,否则属性会消失

Note The final step, be sure to convert, the type is not converted to a string object, so the custom amount property will be lost.

The following are the final effects:

In addition to changing the size of the hint, other properties can be changed, the specific spaned type can refer to this link: Android in various types of span comprehensive system research

Note: This article belongs to [email protected] Jiangnan Yi Original, reproduced please indicate the source http://www.jiangnane.com/

e-mail: [email protected]

Customize the size of hint text in EditText in Android