如何在Edittext Android中展开所选文本？

Question

我正在使用编辑文本来支持粗体,斜体和下划线的属性.在选择文本并使其变为粗体后,我获得了成功.现在我想在点击Normal按钮后删除粗体.

Typeface.NORMAL在这里不起作用.任何人都可以建议其他选择.

Button btnBold = (Button) findViewById(R.id.btnBold);
        btnBold.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                startSelection = etx.getSelectionStart();
                endSelection = etx.getSelectionEnd();


                Spannable s = etx.getText();
                s.setSpan(new StyleSpan(android.graphics.Typeface.BOLD), startSelection, endSelection, 0);
            }
        });


Button btnNormal = (Button) findViewById(R.id.btnNormal );
        btnNormal .setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                **//What I have to do here.**
            }
        });

Answer 1

Button btnNormal = (Button) findViewById(R.id.btnNormal );
        btnNormal .setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
               Spannable str = etx.getText();
               StyleSpan[] ss = str.getSpans(selectionStart, selectionEnd, StyleSpan.class);

       for (int i = 0; i < ss.length; i++) {
           if (ss[i].getStyle() == android.graphics.Typeface.BOLD){
            str.removeSpan(ss[i]);          
           }
       }
    etx.setText(str);

    }
});