textview 中间的字变色并可点击

public class MainActivity extends AppCompatActivity {
    private TextView tv1 ;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tv1 = (TextView) findViewById( R.id.tv1 );
        String url1 =  "这是测试";
        String url2 = "点击一下试试看";
        String url = url1 + url2;
        SpannableStringBuilder style = new SpannableStringBuilder(url1 + url2);
        TextViewURLSpan myURLSpan = new TextViewURLSpan();
        style.setSpan(myURLSpan, url1.length(), url.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
        style.setSpan(new StyleSpan(Typeface.NORMAL ), url1.length(), url.length(), Spannable.SPAN_INCLUSIVE_EXCLUSIVE);
        style.setSpan(new UnderlineSpan(), url1.length(), url.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
        style.setSpan(new ForegroundColorSpan(getResources().getColor(R.color.colorPrimaryDark)), url1.length(), url.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
        //  style.setSpan(new BackgroundColorSpan(getResources().getColor(R.color.colorAccent)), url1.length(),url.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
        tv1.setText(style);

        //设置超链接为可点击状态
        tv1.setMovementMethod(LinkMovementMethod.getInstance());


    }

    class TextViewURLSpan extends ClickableSpan {
        @Override
        public void updateDrawState(TextPaint ds) {
            ds.setColor(getResources().getColor(R.color.colorAccent));
            ds.setUnderlineText(false); //去掉下划线
        }

        @Override
        public void onClick(View widget) {//点击事件
            Toast.makeText( MainActivity.this, "点击了", Toast.LENGTH_SHORT).show();
        }
    }

}