改变textview字体颜色

例子1：

设置部分文字背景高亮显示：

Java代码

public class HighLightActivity extends Activity {

String strs= "我的心太乱了，给我点空白。" ;

TextView textview;  int  start = 3 ;  int  end =  5 ;

@Override  public  void  onCreate(Bundle savedInstanceState) {

super .onCreate(savedInstanceState);

setContentView(R.layout.high_light);

textview=(TextView)findViewById(R.id.textview);

SpannableStringBuilder style= new  SpannableStringBuilder(strs);

style.setSpan( new  BackgroundColorSpan(Color.RED),start,end,Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

textview.setText(style);

}

}

同时设置文字和背景高亮显示：

Java代码

public  class  HighLightActivity  extends  Activity {

String strs= "我的心太乱了，给我点空白。" ;

TextView textview;  int  start = 3 ;  int  end =  5 ;

@Override

public  void  onCreate(Bundle savedInstanceState) {

super .onCreate(savedInstanceState);

setContentView(R.layout.high_light);

textview=(TextView)findViewById(R.id.textview);

SpannableStringBuilder style= new  SpannableStringBuilder(strs);

style.setSpan( new  BackgroundColorSpan(Color.RED),start,end,Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

style.setSpan( new  ForegroundColorSpan(Color.RED), 7 , 9 ,Spannable.SPAN_EXCLUSIVE_INCLUSIVE);

textview.setText(style);

}

}

参数说明：
Spannable.SPAN_EXCLUSIVE_EXCLUSIVE
API里面解释：Spans of type SPAN_EXCLUSIVE_EXCLUSIVE do not expand to include text inserted at either their starting or ending point. They can never have a length of 0 and are automatically removed from the buffer if all the text they cover is removed.
即在原文本头或尾追加新文本的样式不受原文本样式影响，原文本高亮，新追加文本不高亮。

Spannable.SPAN_EXCLUSIVE_INCLUSIVE
API里面解释：Non-0-length spans of type SPAN_INCLUSIVE_EXCLUSIVE expand to include text inserted at their ending point but not at their starting point. When 0-length, they behave like points.
即在原文本尾追加新文本的样式受原文本样式影响，原来文本尾高亮，新追加文本也高亮