android--设置TextView部分文字的颜色和背景(高亮显示)

最新推荐文章于 2021-05-27 16:56:49 发布

iteye_1576

最新推荐文章于 2021-05-27 16:56:49 发布

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分类专栏： android 文章标签： Android OS

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本文介绍了在Android中实现特定文本区域的背景及前景颜色高亮的方法，通过使用`SpannableStringBuilder`结合`BackgroundColorSpan`和`ForegroundColorSpan`来定制TextView内的文字样式。

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设置部分文字背景高亮显示：

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;
    /** 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);

    }

}

显示效果：

[img]http://dl.iteye.com/upload/attachment/352322/10b612bc-0826-3f5c-afa3-f1555c328955.jpg[/img]

同时设置文字和背景高亮显示：

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="我的心太乱了，给我点空白。";
	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);

    }

}

显示效果：

[img]http://dl.iteye.com/upload/attachment/352324/4b5442e1-84aa-3b0e-a4dd-f5b1c1e51e61.jpg[/img]

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。