TransformationMethod type=edit2.getTransformationMethod();

if (PasswordTransformationMethod.getInstance().equals(type)) {

edit2.setTransformationMethod(HideReturnsTransformationMethod.getInstance());

imb1.setImageResource(R.drawable.black);

} else {

edit2.setTransformationMethod(PasswordTransformationMethod.getInstance());

imb1.setImageResource(R.drawable.blue);

在监听器的内部加上这部分代码就可以了

希望能帮到你