26
2017
09

Kotlin实现一个简单的登录界面

  刚接触Kotlin的第一天,仿照QQ的登录界面,先写一个简单的登录界面,虽然笔者用的不是很熟,还在慢慢摸索,但是Kotlin是真的很简洁,笔者的实现效果如下:
这里写图片描述


登录界面代码如下:

class LoginActivity : AppCompatActivity(), View.OnClickListener {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        //setContentView(R.layout.activity_login)
        LoginUi().setContentView(this@LoginActivity)
    }

    lateinit var et_account: EditText
    lateinit var et_password: EditText

    inner class LoginUi : AnkoComponent<LoginActivity> {
        override fun createView(ui: AnkoContext<LoginActivity>) = with(ui) {
            verticalLayout {
                backgroundColor = context.resources.getColor(android.R.color.white)
                gravity = Gravity.CENTER_HORIZONTAL
                imageView(R.drawable.touxiang).lparams {
                    width = dip(100)
                    height = dip(100)
                    topMargin = dip(64)
                }

                linearLayout {
                    gravity = Gravity.CENTER_VERTICAL
                    orientation = HORIZONTAL
                    backgroundResource = R.drawable.bg_frame_corner
                    imageView {
                        image = resources.getDrawable(R.mipmap.ic_username)
                    }.lparams(width = wrapContent, height = wrapContent) {
                        leftMargin = dip(12)
                        rightMargin = dip(15)
                    }
                    et_account = editText {
                        hint = "登录账户"
                        hintTextColor = Color.parseColor("#666666")
                        textSize = 14f
                        background = null
                    }.lparams {
                        topMargin = dip(5)
                    }
                }.lparams(width = dip(300), height = dip(40)) {
                    topMargin = dip(30)
                }

                linearLayout {
                    gravity = Gravity.CENTER_VERTICAL
                    orientation = HORIZONTAL
                    backgroundResource = R.drawable.bg_frame_corner
                    imageView {
                        image = resources.getDrawable(R.mipmap.ic_password)
                    }.lparams(width = wrapContent, height = wrapContent) {
                        leftMargin = dip(12)
                        rightMargin = dip(15)
                    }
                    et_password = editText {
                        hint = "账户密码"
                        hintTextColor = Color.parseColor("#666666")
                        textSize = 14f
                        background = null
                    }.lparams {
                        topMargin = dip(5)
                    }
                }.lparams {
                    width = dip(300)
                    height = dip(40)
                    topMargin = dip(10)
                }

                button("登录") {
                    gravity = Gravity.CENTER
                    background = resources.getDrawable(R.drawable.bg_login_btn)
                    textColor = Color.parseColor("#ffffff")
                    textSize = 18f
                    onClick {
                        if (et_account.text.toString().isNotEmpty() && et_password.text.toString().isNotEmpty())
                            startActivity<MainActivity>() else toast("请输入账户或者密码")
                    }
                }.lparams(width = dip(300), height = dip(44)) {
                    topMargin = dip(18)
                }

                linearLayout {
                    orientation = HORIZONTAL
                    gravity = Gravity.CENTER_VERTICAL
                    checkBox("记住密码") {
                        textColor = Color.parseColor("#666666")
                        textSize = 16f
                        leftPadding = dip(5)
                    }
                    textView("新用户注册") {
                        textColor = Color.parseColor("#1783e3")
                        gravity = Gravity.RIGHT
                        textSize = 16f
                    }.lparams(width = matchParent)
                }.lparams(width = dip(300)) {
                    topMargin = dip(18)
                }

                textView("Copyright © Henry") {
                    textSize = 14f
                    gravity = Gravity.CENTER or Gravity.BOTTOM

                }.lparams {
                    bottomMargin = dip(35)
                    weight = 1f
                }
            }
        }
    }

    override fun onClick(v: View) {
        when (v.id) {
        }
    }
}

  实现出来的效果和我们设置布局文件所实现的效果一样,但是相比使用布局文件来说,使用Kotlin将会更加的简洁明了,省去了定义变量和查找布局文件的操作,大大解放了我们程序员;
  下面的代码所示是笔者使用布局文件实现的布局效果,和上面的效果一样,但是会复杂很多,大家可以自己自己体会一下;

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_gravity="center_horizontal" android:background="#ffffff" android:orientation="vertical" android:padding="40dp">

    <de.hdodenhof.circleimageview.CircleImageView  xmlns:app="http://schemas.android.com/apk/res-auto" android:id="@+id/profile_image" android:layout_width="96dp" android:layout_height="96dp" android:layout_gravity="center_horizontal" android:src="@drawable/touxiang" app:civ_border_color="#FF000000" app:civ_border_width="2dp" />

    <LinearLayout  android:id="@+id/lin_count" android:layout_width="300dp" android:layout_height="40dp" android:layout_marginTop="45dp" android:background="@drawable/bg_frame_corner" android:gravity="center_vertical" android:orientation="horizontal">

        <ImageView  android:layout_width="wrap_content" android:layout_height="25dp" android:layout_marginLeft="12dp" android:layout_marginRight="15dp" android:src="@drawable/count" />

        <EditText  android:id="@+id/loginAccount" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="@null" android:hint="登录账户" android:maxLength="11" android:textSize="16sp" />
    </LinearLayout>

    <LinearLayout  android:id="@+id/lin_password" android:layout_width="300dp" android:layout_height="40dp" android:layout_marginTop="10dp" android:background="@drawable/bg_frame_corner" android:gravity="center_vertical" android:orientation="horizontal">

        <ImageView  android:layout_width="wrap_content" android:layout_height="25dp" android:layout_marginLeft="12dp" android:layout_marginRight="15dp" android:src="@drawable/password"/>

        <EditText  android:id="@+id/loginPassword" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="@null" android:hint="账户密码" android:password="true" android:maxLength="11" android:textSize="16sp"/>
    </LinearLayout>

    <Button  android:id="@+id/login_button" android:layout_width="300dp" android:layout_height="44dp" android:layout_gravity="center" android:background="@drawable/bg_login_btn" android:layout_marginTop="18dp" android:text="登录" android:textColor="#ffffff" android:textSize="18sp" />

    <LinearLayout  android:id="@+id/lin_remember" android:layout_width="300dp" android:layout_height="wrap_content" android:layout_marginTop="18dp" android:gravity="center_vertical" android:orientation="horizontal">

        <CheckBox  android:id="@+id/rem_pas_check" android:layout_width="wrap_content" android:layout_height="wrap_content" android:paddingLeft="5dp" android:text="记住密码" android:textColor="#666666" android:textSize="16sp" />

        <TextView  android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="right" android:text="新用户注册" android:textColor="#1783e3" android:textSize="16sp" />
    </LinearLayout>

    <TextView  android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginBottom="35dp" android:layout_weight="1" android:gravity="bottom|center" android:text="Copyright © Henry" android:textSize="14sp" />

</LinearLayout>

提示:若是读者还没使用过Kotlin,可以看一下下面这篇文章;有什么问题还可以留言,大家交流讨论;

Android Studio中安装Kotlin插件及如何使用

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