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高亮变色显示文本中的关键字

article 2024/11/20 13:25:36

效果

在这里插入图片描述

第一步：按如下所示代码创建一个用来高亮显示文本的工具类：

public class KeywordUtil {
    /**
     * 单个关键字高亮变色
     * @param color   变化的色值
     * @param text    文字
     * @param keyword 文字中的关键字
     * @return
     */
    public static SpannableString highLight(int color, String text, String keyword) {
        SpannableString res = new SpannableString("\t\t\t" + text);
        Pattern pattern = Pattern.compile(keyword);
        Matcher matcher = pattern.matcher(res);
        while (matcher.find()) {
            int start = matcher.start();
            int end = matcher.end();
            res.setSpan(new ForegroundColorSpan(color), start, end, 
				Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
        }
        return res;
    }
    public static SpannableString highLight(int color,String text,String... keyword) {
        SpannableString res = new SpannableString("\t\t\t" + text);
        for (String key : keyword) {
            Pattern pattern = Pattern.compile(key);
            Matcher matcher = pattern.matcher(res);
            while (matcher.find()) {
                int start = matcher.start();
                int end = matcher.end();
                res.setSpan(new ForegroundColorSpan(color), start, end, 
				Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
            }
        }
        return res;
    }
    public static SpannableString highLight(int[] cs,String text,String... keyword) {
        SpannableString res = new SpannableString("\t\t\t" + text);
        for (int i = 0; i < color.length; i++) {
            Pattern pattern = Pattern.compile(keyword[i]);
            Matcher matcher = pattern.matcher(res);
            while (matcher.find()) {
                int start = matcher.start();
                int end = matcher.end();
                res.setSpan(new ForegroundColorSpan(cs[i]), start, end, 
				Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
            }
        }
        return res;
    }
}

第二步：在主布局文件中添加三个id值分别为textView1、textView3、textView3的TextView控件，然后修改MainActivity类的代码如下所示：

public class MainActivity extends AppCompatActivity {
    private android.widget.TextView textView1;
    private android.widget.TextView textView2;
    private android.widget.TextView textView3;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        this.textView2 = (TextView) findViewById(R.id.textView2);
        this.textView1 = (TextView) findViewById(R.id.textView1);
        this.textView3 = (TextView) findViewById(R.id.textView3);
        String text = "随着棉花糖的出现，一种新……度，探讨处理权限请求的方法";
        SpannableString spanStr1 = KeywordUtil.highLight(Color.RED, text, "权限");
        textView1.setText(spanStr1);
        SpannableString spanStr2 = KeywordUtil.highLight(
		Color.RED, text, "棉花糖","权限","安卓");
        textView2.setText(spanStr2);
        SpannableString spanStr3 = KeywordUtil.highLight(
	new int[]{Color.RED,Color.GREEN,Color.BLUE}, text, "棉花糖","权限","安卓");
        textView3.setText(spanStr3);
    }
}