Android动画三：使用 Transition 最简单方式实现
2019-09-28 本文已影响0人
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在 android.view.animation.*包下有多种实现动画的方式，有逐帧动画、补间动画、属性动画，可以实现复杂的动画。其实在 android.transition.* 或 androidx.transition.* 下面有非常简单的实现动画方式，同样可以实现复杂的动画，使用方式非常简单。
教程
实现动画的方式非常简单，只需要在改变显示方式之前调用 TransitionManager.beginDelayedTransition 即可，支持改变显示、隐藏、大小修改、位置修改。setDuration() 设置动画的时长。
// 设置动画方式 - 默认
TransitionManager.beginDelayedTransition(rootView)
button.visibility = View.VISIBLE
// 设置动画方式 - 淡入淡出
val fade = Fade().setDuration(1000)
TransitionManager.beginDelayedTransition(rootView, fade)
button.visibility = View.VISIBLE
// 设置动画方式 - 右边滑动
val slide = Slide(Gravity.RIGHT).setDuration(1000)
TransitionManager.beginDelayedTransition(rootView, slide)
button.visibility = View.VISIBLE
// 分离 Explode()
完整代码
TransitionActivity.kt
class TransitionActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
val rootView = LinearLayout(this)
rootView.orientation = LinearLayout.VERTICAL
setContentView(rootView)
val viewGroup1 = getTemplate("无动画", Runnable {
})
val viewGroup2 = getTemplate("默认动画", Runnable {
TransitionManager.beginDelayedTransition(rootView)
})
val viewGroup3 = getTemplate("淡入淡出", Runnable {
TransitionManager.beginDelayedTransition(rootView, Fade().setDuration(1000))
})
val viewGroup4 = getTemplate("滑动动画", Runnable {
TransitionManager.beginDelayedTransition(rootView, Slide().setDuration(1000))
})
val viewGroup5 = getTemplate("滑动动画 - 右边", Runnable {
TransitionManager.beginDelayedTransition(rootView, Slide(Gravity.RIGHT).setDuration(1000))
})
rootView.addView(viewGroup1)
rootView.addView(viewGroup2)
rootView.addView(viewGroup3)
rootView.addView(viewGroup4)
rootView.addView(viewGroup5)
}
private fun getTemplate(text: String, runnable: Runnable): ViewGroup {
val viewGroup = LayoutInflater.from(this).inflate(R.layout.view_transition, null) as ViewGroup
viewGroup.target.text = text
viewGroup.button1.setOnClickListener {
runnable.run()
viewGroup.target.visibility = View.INVISIBLE
}
viewGroup.button2.setOnClickListener {
runnable.run()
viewGroup.target.visibility = View.VISIBLE
}
viewGroup.button3.setOnClickListener {
runnable.run()
val layoutParams = viewGroup.target.layoutParams as LinearLayout.LayoutParams
layoutParams.width = 300
layoutParams.height = 200
layoutParams.topMargin = 100
viewGroup.target.layoutParams = layoutParams
}
viewGroup.button4.setOnClickListener {
runnable.run()
val layoutParams = viewGroup.target.layoutParams as LinearLayout.LayoutParams
layoutParams.width = ViewGroup.LayoutParams.MATCH_PARENT
layoutParams.height = ViewGroup.LayoutParams.WRAP_CONTENT
layoutParams.topMargin = 0
viewGroup.target.layoutParams = layoutParams
}
return viewGroup
}
}
view_transition.xml
<?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:orientation="vertical"
android:padding="10dp">
<Button
android:id="@+id/target"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="默认动画" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="隐藏" />
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="显示" />
<Button
android:id="@+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="放大" />
<Button
android:id="@+id/button4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="缩小" />
</LinearLayout>
</LinearLayout>
