TextView之你不知道的使用技巧

作为程序员，对自己写的代码要尽可能做到优化，但是，往往最简单的却最容易被忽视，比如，今天要给大家说的（只会说平时会被忽略的属性或者技巧，最常用的属性不介绍），TextView的使用奇技淫巧，且听我慢慢道来。

无图无真相（有点丑）：

这里写图片描述

下面就是代码（注释很详细）

public class MainActivity extends AppCompatActivity {

    private TextView tv1, tv2, tv3, tv4, tv5, tv6, tv8;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        initView();
    }

    private void initView() {
        setContentView(R.layout.activity_main);
        tv1 = (TextView) findViewById(R.id.tv1);
        tv1.setText(getString(R.string.xliff_1, "code小生", "Android爱好者"));

        tv2 = (TextView) findViewById(R.id.tv2);
        tv2.setTypeface(Typeface.createFromAsset(getAssets(), "simkai.ttf"));

        tv3 = (TextView) findViewById(R.id.tv3);
        setTextSpannable(tv3);

        // 定制超链接
        tv4 = (TextView) findViewById(R.id.tv4);
        tv4.setText(getClickableSpan(tv4));
        //设置该句使设置了链接的文本的超连接起作用
        tv4.setMovementMethod(LinkMovementMethod.getInstance());

        // 设置多种颜色字体
        tv5 = (TextView) findViewById(R.id.tv5);
        String str1 = "<font color=\"#404f50\">年轻的我们,</font>";
        String str2 = "<font color=\"#ff0000\">即将奔赴战场</font>";
        tv5.setText(Html.fromHtml(str1 + str2));

        // 加载html中的图片
        tv6 = (TextView) findViewById(R.id.tv6);
        setHtmlBitmap(tv6);

        tv8 = (TextView) findViewById(R.id.tv8);
        String text = String.format("¥%1$s 门市价：¥%2$s", "88.8", "150");
        int index = text.indexOf("门");
        SpannableStringBuilder span = new SpannableStringBuilder(text);
        span.setSpan(new ForegroundColorSpan(Color.parseColor("#00ff00")), 0, index - 1, Spanned.SPAN_EXCLUSIVE_INCLUSIVE);
        span.setSpan(new AbsoluteSizeSpan(28), index, text.length(), Spanned.SPAN_EXCLUSIVE_INCLUSIVE);
        span.setSpan(new ForegroundColorSpan(Color.parseColor("#afafaf")), index, text.length(), Spanned.SPAN_EXCLUSIVE_INCLUSIVE);
        tv8.setText(span);
    }
    //http://www.jcodecraeer.com/a/anzhuokaifa/androidkaifa/2015/0120/2335.html

    /**
     *
     * 设置TextView中的某个词突出显示
     *
     * @param textView
     */
    private void setTextSpannable(TextView textView) {
        String text = textView.getText().toString().trim();
        int start = text.indexOf('5');
        int end = text.length();
        Spannable textSpan = new SpannableStringBuilder(text);
        textSpan.setSpan(new AbsoluteSizeSpan(30), 0, start, Spannable.SPAN_INCLUSIVE_INCLUSIVE);
//        textSpan.setSpan(new AbsoluteSizeSpan(45), start, end - 3, Spannable.SPAN_INCLUSIVE_INCLUSIVE);
        // 设置文字颜色
        textSpan.setSpan(new ForegroundColorSpan(Color.BLUE), start, end - 3, Spannable.SPAN_INCLUSIVE_INCLUSIVE);
        textSpan.setSpan(new AbsoluteSizeSpan(30), end - 3, end, Spannable.SPAN_INCLUSIVE_INCLUSIVE);
        textView.setText(textSpan);
    }

    //给指定文本设置超链接
    private SpannableString getClickableSpan(TextView textView) {
        String text = textView.getText().toString().trim();
        final SpannableString spanStr = new SpannableString(text);
        spanStr.setSpan(new UnderlineSpan(), 16, 20, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
        //设置文字的单击事件
        spanStr.setSpan(new ClickableSpan() {
            @Override
            public void onClick(View widget) {
                Toast.makeText(MainActivity.this, "服务条款", Toast.LENGTH_SHORT).show();
            }
        }, 16, 20, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
        spanStr.setSpan(new ForegroundColorSpan(Color.BLUE), 16, 20, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
        // 取消点击时的默认背景色
        spanStr.setSpan(new BackgroundColorSpan(Color.WHITE), 16, 20, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

        spanStr.setSpan(new UnderlineSpan(), 21, 25, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
        //设置文字的单击事件
        spanStr.setSpan(new ClickableSpan() {
            @Override
            public void onClick(View widget) {
                Toast.makeText(MainActivity.this, "隐私政策", Toast.LENGTH_SHORT).show();
            }
        }, 21, 25, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
        spanStr.setSpan(new ForegroundColorSpan(Color.GREEN), 21, 25, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
        spanStr.setSpan(new BackgroundColorSpan(Color.WHITE), 21, 25, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

        return spanStr;
    }

    /**
     * TextView加载html/xml中的图片和文字
     *
     * @param textView
     */
    private void setHtmlBitmap(TextView textView) {
        String imgStr = "<b>this is html text</b><br><img src=\"" + R.mipmap.ic_launcher + "\"/>";
        Html.ImageGetter imageGetter = new Html.ImageGetter() {
            @Override
            public Drawable getDrawable(String source) {
                int id = Integer.parseInt(source);
                Drawable draw = getResources().getDrawable(id);
                draw.setBounds(0, 0, 200, 200);
                return draw;
            }
        };
        textView.append(Html.fromHtml(imgStr, imageGetter, null));
    }
}

除了代码实现的某些功能外，有一些是在strings.xml中实现的，完整代码已上传至github，关注公众号“code小生”查看地址。