运算符“+”不能应用于 android.text.SpannableString

Question

enter code here我正在创建一个小型 Android 应用程序。我想在文本视图中显示一个文本，其中包含多个要单击的部分。为此，我正在使用 android.text.SpannableString。这是我的代码：

public class MainActivity extends ActionBarActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);



        final Spannable sd = new SpannableString("Android Multiple clickable strings in textview");
        final ClickableSpan clickableSpan3 = new ClickableSpan() {


            @Override
            public void onClick(View textView) {
                Toast toast1 = Toast.makeText(getApplicationContext(), "first", Toast.LENGTH_SHORT);
                toast1.setGravity(Gravity.CENTER, 0, 0);
                toast1.show();
            }
        };
        final ClickableSpan clickableSpan4 = new ClickableSpan() {
            @Override
            public void onClick(View textView) {

                Toast toast2 = Toast.makeText(getApplicationContext(), "second", Toast.LENGTH_SHORT);
                toast2.setGravity(Gravity.CENTER, 0, 0);
                toast2.show();
            }

        };
        sd.setSpan(clickableSpan3, 8, 16, SPAN_POINT_POINT);
        sd.setSpan(clickableSpan4, 17, 26,Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

        TextView textView = (TextView) findViewById(R.id.hello);
        textView.setText(sd);
        textView.setMovementMethod(new LinkMovementMethod());


    }

它工作正常，但是如果我更改代码以将新词添加到 TextView

mTextView.setText(sd**+"my words"**); mTextView.setMovementMethod(LinkMovementMethod.getInstance());

所有跨越的选择都消失了。如何避免？

Answer 1

使用TextUtils.concat(CharSequence... text)方法。
来自文档：

Returns a CharSequence concatenating the specified CharSequences, retaining their spans if any.

代码应该是这样的：

mTextView.setText(TextUtils.concat(sd,"my words"));

运算符“+”不能应用于 android.text.SpannableString

Operator "+" cannot be aplied to android.text.SpannableString

android

spannablestring