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