您可以根据需要更改它：
public class SampleActivity extends Activity { TextWatcher tt = null; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); final EditText et = (EditText) findViewById(R.id.editText1); final TextView tv = (TextView) findViewById(R.id.textView1); tt = new TextWatcher() {public void afterTextChanged(Editable s){ et.setSelection(s.length());}public void beforeTextChanged(CharSequence s,int start,int count, int after){} public void onTextChanged(CharSequence s, int start, int before, int count) { et.removeTextChangedListener(tt); et.setText(et.getText().toString().replace("A", "C")); et.addTextChangedListener(tt);} }; et.addTextChangedListener(tt); }}
