ValueAnimator
是 对 值的平滑过渡动画。什么意思呢。就是对数值在一定时间内进行平滑过渡。
public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ValueAnimator animator = ValueAnimator.ofFloat(0f, 100f); animator.setDuration(5 * 1000); animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator animation) { Log.i("hhhd", "value is"+animation.getAnimatedValue()); } }); animator.start(); }}
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这里注册了一个监听器的回调,每次动画的状态发生改变,都会回调这个方法。我们这里打印出了animation.getAnimatedValue的值,实际上就是fraction的值,也就是完成度,一个动画从开始到结束,完成的百分比。当然fraction值为0-1。一部分日志打印为
ObjectAnimator
与ValueAnimator不同的是,ObjectAnimator是对 对象的属性 进行平滑过渡。
package com.example.administrator.myanimator;import android.animation.Animator;import android.animation.AnimatorInflater;import android.animation.AnimatorListenerAdapter;import android.animation.AnimatorSet;import android.animation.ObjectAnimator;import android.animation.ValueAnimator;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.util.Log;import android.view.View;import android.widget.Button;import android.widget.TextView;import android.widget.Toast;/** * Created by hd on 2015/12/19. */public class MainActivity extends AppCompatActivity implements View.OnClickListener { private Button alpha; private Button rotation; private Button translation; private Button scale; private TextView textView; ObjectAnimator animator; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); alpha = (Button) findViewById(R.id.alphaBtn); rotation = (Button) findViewById(R.id.rotationBtn); translation = (Button) findViewById(R.id.translationBtn); scale = (Button) findViewById(R.id.scale); alpha.setOnClickListener(this); rotation.setOnClickListener(this); translation.setOnClickListener(this); scale.setOnClickListener(this); textView = (TextView) findViewById(R.id.tvTest); } @Override public void onClick(View v) { switch (v.getId()) { case R.id.alphaBtn: animator = ObjectAnimator.ofFloat(textView, "alpha", 1, 0, 1); animator.setDuration(5 * 1000); break; case R.id.rotationBtn: animator = ObjectAnimator.ofFloat(textView, "rotation", 0f, 360f); animator.setDuration(5 * 1000); break; case R.id.translationBtn: float curTranslationx = textView.getTranslationX(); animator = ObjectAnimator.ofFloat(textView, "translationX", curTranslationx, 500f, -500f,curTranslationx); animator.setDuration(5 * 1000); break; case R.id.scale: animator = ObjectAnimator.ofFloat(textView, "scaleY", 1f, 5f, 4f, 3f, 1f); animator.setDuration(5 * 1000); break; } animator.start(); }}
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<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent"> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal" android:layout_alignParentTop="true"> <Button android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:id="@+id/alphaBtn" android:text="alpha"/> <Button android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:id="@+id/rotationBtn" android:text="totation"/> <Button android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:id="@+id/translationBtn" android:text="translation"/> <Button android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:id="@+id/scale" android:text="scale"/> </LinearLayout> <TextView android:id="@+id/tvTest" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:text="Hello World!" android:textSize="30dp" /></RelativeLayout>