android--設置TextView部分文字的顏色和背景(高亮顯示)

設置部分文字背景高亮顯示：

public class HighLightActivity extends Activity {
    String strs="我的心太亂了，給我點空白。";
    TextView textview;
    int start =3;
    int end = 5;
    /** Called when the activity is first created. */
    @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);

    }

}

public class HighLightActivity extends Activity {
	String strs="我的心太亂了，給我點空白。";
	TextView textview;
	int start =3;
	int end = 5;
    /** Called when the activity is first created. */
    @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);
        
    }

}

顯示效果：



同時設置文字和背景高亮顯示：

package com.justel.contact;

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

public class HighLightActivity extends Activity {
    String strs="我的心太亂了，給我點空白。";
    TextView textview;
    int start =3;
    int end = 5;
    /** Called when the activity is first created. */
    @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);

    }

}

package com.justel.contact;

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

public class HighLightActivity extends Activity {
	String strs="我的心太亂了，給我點空白。";
	TextView textview;
	int start =3;
	int end = 5;
    /** Called when the activity is first created. */
    @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);
        
    }

}

顯示效果：



參數說明：
Spannable.SPAN_EXCLUSIVE_EXCLUSIVE
API裏面解釋：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.
即在原文本頭或尾追加新文本的樣式不受原文本樣式影響，原文本高亮，新追加文本不高亮。

Spannable.SPAN_EXCLUSIVE_INCLUSIVE
API裏面解釋：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樣式受原文本樣式影響，原來文本尾高亮，新追加文本也高亮。