流程如下:
- 导入一张图片到Android项目中去
- 新建一个welcomeActivity
- 修改ActivityManifest文件
1.导入一张图片到Android项目
找到一张图片,粘贴复制到项目下drawable目录下(注意图片的名字,只能是小写字母、数字和下划线组成)
2.新建welcomeActivity
2.1 修改布局文件activity_welcome.xml(添加一个ImageView)
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".WelcomeActivity">
<ImageView
android:id="@+id/imageView"
android:layout_width="0dp"
android:layout_height="0dp"
android:scaleType="centerCrop"
android:scaleX="1.2"
android:scaleY="1.2"
android:src="@drawable/welcome_image"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
2.1 修改activity文件WelcomeActivity
package com.example.gca
import android.content.Intent
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.View
import androidx.core.view.ViewCompat
import androidx.core.view.ViewPropertyAnimatorListener
import kotlinx.android.synthetic.main.activity_welcome.*
class WelcomeActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_welcome)
//设置图片动画
ViewCompat.animate(imageView).apply {
//缩放,变成1.0倍
scaleX(1.0f)
scaleY(1.0f)
//动画时常1秒
duration = 1000
//动画监听
setListener(object : ViewPropertyAnimatorListener {
override fun onAnimationEnd(view: View?) { //动画结束
//进入主界面,并结束掉该页面
startActivity(Intent(this@WelcomeActivity, MainActivity::class.java))
finish()
}
override fun onAnimationCancel(view: View?) {
}
override fun onAnimationStart(view: View?) {
}
})
}
}
}
3.修改ActivityManifest文件
这里要做的就是新建一个style(全屏)给WelcomeActivity,同时让WelcomeActivity成为启动界面
3.1新建style
在res/values/styles.xml文件内新建一个style(添加以下代码)
<style name="AppTheme.FullScreen"> //style名字
<item name="windowNoTitle">true</item> //不显示标题
<item name="android:windowFullscreen">true</item> //全屏
</style>
完成如下:(添加之后的样子)
<resources>
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<!-- Customize your theme here. -->
<item name="colorPrimary">@color/colorPrimary</item>
<item name="colorPrimaryDark">@color/colorPrimaryDark</item>
<item name="colorAccent">@color/colorAccent</item>
</style>
<style name="AppTheme.FullScreen">
<item name="windowNoTitle">true</item>
<item name="android:windowFullscreen">true</item>
</style>
</resources>
3.1修改ActivityManifest文件
style(全屏)给WelcomeActivity,同时让WelcomeActivity成为启动界面,修改前:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:dist="http://schemas.android.com/apk/distribution"
package="com.example.gca">
<dist:module dist:instant="true" />
<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/AppTheme">
<activity android:name=".WelcomeActivity"></activity>
<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>
修改后:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:dist="http://schemas.android.com/apk/distribution"
package="com.example.gca">
<dist:module dist:instant="true" />
<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/AppTheme">
<activity android:name=".MainActivity"></activity>
<activity android:name=".WelcomeActivity"
android:theme="@style/AppTheme.FullScreen">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
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