kotlin for android 之缩放大小
继续昨天的项目，修改fragment_blank.xml文件：<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
>
<!-- TODO: Update blank fragment layout -->
<TextView
android:id="@+id/idtexta"
android:layout_width="match_parent"
android:layout_height="200dp"
android:background="#ffff00"
android:text="@string/hello_blank_fragment" />
<Button
android:id="@+id/idbuttona"
android:text="颜色渐变"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<Button
android:id="@+id/idbuttonb"
android:text="缩放大小"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
这里只是添加了个按钮，然后修改BlankFragment.kt文件：
package com.example.xinwei.fragmentkotlin
import android.app.Fragment
import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.view.animation.AlphaAnimation
import android.view.animation.Animation
import android.view.animation.ScaleAnimation
import android.widget.Button
import android.widget.TextView
import kotlinx.android.synthetic.main.fragment_blank.*
class BlankFragment : Fragment() {
var textView:TextView?=null
var view1:View?=null
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?): View? {
view1=inflater.inflate(R.layout.fragment_blank, container, false)
var animation=AlphaAnimation(0.0f,1.0f)
textView=view1?.findViewById<TextView>(R.id.idtexta)
animation.duration=3000
animation.repeatMode=Animation.REVERSE
var button=view1?.findViewById<Button>(R.id.idbuttona)
button?.setOnClickListener {
textView?.startAnimation(animation)
}
scaleAnimation()
return view1
}
private fun scaleAnimation() {
var button2=view1?.findViewById<Button>(R.id.idbuttonb)
var scale=ScaleAnimation(0.1f,1.0f,0.1f,1.0f,0.5f,0.5f)
scale.duration=3000
scale.repeatMode=Animation.REVERSE
button2?.setOnClickListener {
textView?.startAnimation(scale)
}
}
}
这里面的scaleAnimation()方法就是缩放大小的代码，效果图：
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