dt1=(EditText)findViewById(R.id.password);   cb1=(CheckBox)findViewById(R.id.checkbox_1); cb1.setOnCheckedChangeListener(new OnCheckedChangeListener() {      @Override   public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {     // TODO Auto-generated method stub     if(cb1.isChecked()){              dt1.setTransformationMethod(HideReturnsTransformationMethod.getInstance()); //如果被選中則顯示密碼       dt1.setSelection(dt1.getText().length());   //TextView默認光標在最左端，這里控制光標在最右端            }else {              dt1.setTransformationMethod(PasswordTransformationMethod.getInstance()); //如果沒選中CheckBox則隱藏密碼     dt1.setSelection(dt1.getText().length());   } } );