android控制密码显示与隐藏

private ImageView ivNewpw;
private EditText etPhone;


ivNewpw = (ImageView) findViewById(R.id.iv_newpw);
etPhone = (EditText) findViewById(R.id.et_phone);
ivNewpw.setonClickListener(new View.onClickListener() {
            @Override
            public void onClick(View v) {
                TransformationMethod method = etPhone.getTransformationMethod();
                if (method == HideReturnsTransformationMethod.getInstance()) {
                    etPhone.setTransformationMethod(PasswordTransformationMethod.getInstance());
                    ivNewpw.setBackgroundResource(R.mipmap.uneye);
                } else {
                    etPhone.setTransformationMethod(HideReturnsTransformationMethod.getInstance());
                    ivNewpw.setBackgroundResource(R.mipmap.eye);
                }
            }
        });