怎么在Android中使用Kotlin实现一个登录界面？很多新手对此不是很清楚，为了帮助大家解决这个难题，下面小编将为大家详细讲解，有这方面需求的人可以来学习下，希望你能有所收获。
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>看完上述内容是否对您有帮助呢？如果还想对相关知识有进一步的了解或阅读更多相关文章，请关注编程网行业资讯频道，感谢您对编程网的支持。
