不同的提示字体样式和键入的文本字体样式android

Question

我想为不同的字体样式提示和字体样式在edittext文本中输入。 例如。可以说，提示字体大小是12和它的正常类型。但是当用户开始在edittext中输入时，输入文本的字体大小应该变为14并且粗体。再次如果用户删除文本提示应该是上述类型。

Answer 1

您可以以编程方式更改提示颜色，使其通过使用下面的代码

editTextId.setHintTextColor(Color.alpha(006666)); 

Answer 2

已经给出的答案是正确的，但目前指定不同的颜色可能也是在在EditText上输入字体样式不同XML文件通过android：textColorHint属性。举例来说，你可以做这样的事情（假设你已经正确定义my_favourite_colour作为一种资源）：

<EditText 
... other properties here ... 
android:textColorHint="@color/my_favourite_colour" 
</EditText> 

Answer 3

可以使用SpannableString和MetricAffectingSpan实现它。您将可以更改提示的字体，大小和样式。

1）创建自定义Hint对象：

import android.graphics.Typeface; 
import android.text.SpannableString; 
import android.text.Spanned; 
import android.text.style.MetricAffectingSpan; 

public class CustomHint extends SpannableString 
{ 
    public CustomHint(final CharSequence source, final int style) 
    { 
     this(null, source, style, null); 
    } 

    public CustomHint(final CharSequence source, final Float size) 
    { 
     this(null, source, size); 
    } 

    public CustomHint(final CharSequence source, final int style, final Float size) 
    { 
     this(null, source, style, size); 
    } 

    public CustomHint(final Typeface typeface, final CharSequence source, final int style) 
    { 
     this(typeface, source, style, null); 
    } 

    public CustomHint(final Typeface typeface, final CharSequence source, final Float size) 
    { 
     this(typeface, source, null, size); 
    } 

    public CustomHint(final Typeface typeface, final CharSequence source, final Integer style, final Float size) 
    { 
     super(source); 

     MetricAffectingSpan typefaceSpan = new CustomMetricAffectingSpan(typeface, style, size); 
     setSpan(typefaceSpan, 0, source.length(), Spanned.SPAN_INCLUSIVE_EXCLUSIVE); 
    } 
} 

2）创建的自定义对象MetricAffectingSpan：

import android.graphics.Typeface; 
import android.text.TextPaint; 
import android.text.style.MetricAffectingSpan; 

public class CustomMetricAffectingSpan extends MetricAffectingSpan 
{ 
    private final Typeface _typeface; 
    private final Float _newSize; 
    private final Integer _newStyle; 

    public CustomMetricAffectingSpan(Float size) 
    { 
     this(null, null, size); 
    } 

    public CustomMetricAffectingSpan(Float size, Integer style) 
    { 
     this(null, style, size); 
    } 

    public CustomMetricAffectingSpan(Typeface type, Integer style, Float size) 
    { 
     this._typeface = type; 
     this._newStyle = style; 
     this._newSize = size; 
    } 

    @Override 
    public void updateDrawState(TextPaint ds) 
    { 
     applyNewSize(ds); 
    } 

    @Override 
    public void updateMeasureState(TextPaint paint) 
    { 
     applyNewSize(paint); 
    } 

    private void applyNewSize(TextPaint paint) 
    { 
     if (this._newStyle != null) 
      paint.setTypeface(Typeface.create(this._typeface, this._newStyle)); 
     else 
      paint.setTypeface(this._typeface); 

     if (this._newSize != null) 
      paint.setTextSize(this._newSize); 
    } 
} 

3）使用：

Typeface newTypeface = Typeface.createFromAsset(getAssets(), "AguafinaScript-Regular.ttf"); 
CustomHint customHint = new CustomHint(newTypeface, "Enter some text", Typeface.BOLD_ITALIC, 60f); 
     //  CustomHint customHint = new CustomHint(newTypeface, "Enter some text", Typeface.BOLD_ITALIC); 
     //  CustomHint customHint = new CustomHint(newTypeface, "Enter some text", 60f); 
     //  CustomHint customHint = new CustomHint("Enter some text", Typeface.BOLD_ITALIC, 60f); 
     //  CustomHint customHint = new CustomHint("Enter some text", Typeface.BOLD_ITALIC); 
     //  CustomHint customHint = new CustomHint("Enter some text", 60f); 

customEditText.setHint(customHint);