android_5 修改一个textview中的字符串的颜色

例：Hello World, 欢迎观看《android教程》哈哈!

要求把《android教程》变红，其他为绿

给textView定义一个id，定义id的方法：android:id="@+id/tv"

android:autoLink="all" 表示web/mail/map之类的都加链接

修改main.xml：

<TextView 
      android:id="@+id/tv"
      android:layout_width="fill_parent"
      android:layout_height="wrap_content"
      android:textSize="20sp"
      android:textColor="#00ff00"
      android:text="@string/say"
      />

 String.xml：

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="hello">Hello World, TextVitwDemoActivity!</string>
    <string name="say">Hello World, 欢迎观看《android教程》哈哈!</string>
    <string name="app_name">TextViewDemo</string>

</resources>

TextVitwDemoActivity.java：

package com.mhm.textView;

import android.app.Activity;
import android.os.Bundle;
import android.text.Html;
import android.widget.TextView;

public class TextVitwDemoActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        TextView tv = (TextView)findViewById(R.id.tv);
        String text = tv.getText().toString();
        int tb = text.indexOf("《");
        int te = text.indexOf("》") + 1;
        String text_b = text.substring(0, tb);
        String text_m = text.substring(tb, te);
        String text_e = text.substring(te, text.length());
        tv.setText(Html.fromHtml(text_b + "<font color=red>" + text_m + "</font>" + text_e));
    }
}

也可以这样写：

package com.mhm.textView;

import android.R.color;
import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.text.Html;
import android.text.Spannable;
import android.text.SpannableStringBuilder;
import android.text.style.ForegroundColorSpan;
import android.widget.TextView;

public class TextVitwDemoActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        TextView tv = (TextView)findViewById(R.id.tv);
        String text = tv.getText().toString();
        int tb = text.indexOf("《");
        int te = text.indexOf("》") + 1;
        SpannableStringBuilder style = new SpannableStringBuilder(text);
        style.setSpan(new ForegroundColorSpan(Color.GREEN), 0, tb, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
        style.setSpan(new ForegroundColorSpan(Color.RED), tb, te, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
        style.setSpan(new ForegroundColorSpan(Color.GREEN), te, text.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
        tv.setText(style);
    }
}

 这里有个奇怪的地方，int te = text.indexOf("》") + 1

+1必须写在这里，写在下面就不行。。。啥原因？

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