在登录或者注册的时刻，有些软件中，需求请求暗码可以查看和隐蔽，其实实现起来也很简单。

[img]http://img.blog.csdn.net/20150105175020144?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvbGVuZ2d1b3hpbmc=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center

起首定义构造：

<LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="50.0dip"
        android:layout_marginLeft="15dip"
        android:layout_marginRight="15dip"
        android:background="@drawable/update_password_item_bg_bottom"
        android:gravity="center_vertical"
        android:orientation="horizontal" >

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="fill_parent"
            android:gravity="right|center_vertical"
            android:paddingLeft="5.0dip"
            android:text="@string/login_pwd"
            android:textColor="@android:color/black"
            android:textSize="16.0sp" />

        <EditText
            android:id="@+id/my_lottery_login_page_password"
            android:layout_width="0px"
            android:layout_height="fill_parent"
            android:layout_marginLeft="5.0dip"
            android:layout_marginRight="5.0dip"
            android:layout_weight="3"
            android:background="@android:color/white"
            android:hint="@string/login_imput_pwd"
            android:inputType="textPassword"
            android:maxLength="20"
            android:paddingLeft="5.0dip"
            android:singleLine="true"
            android:textSize="16.0sp" />

        <Button
            android:id="@+id/my_lottery_login_page_show_password"
            android:layout_width="45dip"
            android:layout_height="30dip"
            android:layout_marginRight="3dip"
            android:background="@drawable/btn_yangzhengma_selector"
            android:text="显示"
            android:textColor="#454545"
            android:textSize="14sp" />
    </LinearLayout>

然后监听那个按钮。在java代铝闼楝定义一个标记

private Boolean showPassword = true;
if(showPassword){//显示暗码   
				showPassword = !showPassword;
				login_show_password.setText("隐蔽");
				login_page_password.setTransformationMethod(HideReturnsTransformationMethod.getInstance());
				login_page_password.setSelection(login_page_password.getText().toString().length());
			}else{//隐蔽暗码
				showPassword = !showPassword;
				login_show_password.setText("显示");
				login_page_password.setTransformationMethod(PasswordTransformationMethod.getInstance());
				login_page_password.setSelection(login_page_password.getText().toString().length());
			}