private Button mBtnPassword;

    private EditText mEtPassword;

    private boolean mbDisplayFlg = false;

    /** Called when the activity is first created. */

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

        mEtPassword = (EditText)findViewById(R.id.password);

        mBtnPassword = (Button)findViewById(R.id.btnPassword);

        mBtnPassword.setOnClickListener(new OnClickListener() {

            @Override

            public void onClick(View v) {

                // TODO Auto-generated method stub

                Log.d("AndroidTest", "mbDisplayFlg = " + mbDisplayFlg);

                if (!mbDisplayFlg) {

                    // display password text, for example "123456"

                    mEtPassword.setTransformationMethod(HideReturnsTransformationMethod.getInstance());

                } else {

                    // hide password, display "."

                    mEtPassword.setTransformationMethod(PasswordTransformationMethod.getInstance());

                }

                mbDisplayFlg = !mbDisplayFlg;

                mEtPassword.postInvalidate();

            }

        });

    }