4个组件 TextView,Button,TextEdit,ImageView依次纵向线性布局。
点击Button可以在手机底部弹出消息显示TextEidt的内容,并切换图片。
AndroidManifext.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.myui">
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/Theme.MyUI">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
UI界面XML:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id ="@+id/textview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!" />
<Button
android:id ="@+id/button1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text ="@string/click_me" />
<EditText
android:id ="@+id/editText1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint ="@string/input_something"
android:inputType="text"
android:autofillHints="text" />
<ImageView
android:id ="@+id/imageView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src ="@drawable/cats"/>
</LinearLayout>
MainActivity的kotlin源码:
package com.example.myui
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.View
import android.widget.Toast
import kotlinx.android.synthetic.main.activity_main.*
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
imageView.setTag(R.drawable.cats)
button1.setOnClickListener{
val inputText = editText1.text.toString()
Toast.makeText(this,inputText, Toast.LENGTH_SHORT).show()
when(imageView.getTag()){
R.drawable.cats->{
imageView.setImageResource(R.drawable.xq)
imageView.setTag(R.drawable.xq)
}
R.drawable.xq->{
imageView.setImageResource(R.drawable.cats)
imageView.setTag(R.drawable.cats)
}
}
}
}
}
build.gradle
plugins {
id 'com.android.application'
id 'kotlin-android'
id 'kotlin-android-extensions'
}
android {
compileSdkVersion 30
buildToolsVersion "30.0.3"
defaultConfig {
applicationId "com.example.myui"
minSdkVersion 29
targetSdkVersion 30
versionCode 1
versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
kotlinOptions {
jvmTarget = '1.8'
}
}
dependencies {
implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
implementation 'androidx.core:core-ktx:1.3.2'
implementation 'androidx.appcompat:appcompat:1.2.0'
implementation 'com.google.android.material:material:1.2.1'
implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
testImplementation 'junit:junit:4.+'
androidTestImplementation 'androidx.test.ext:junit:1.1.2'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
}
注:Android Studio 版本是4.1.1。ImageView的图片须保存在工作目录下的drawable文件夹。
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