Android ValueAnimator和ObjectAnimator的高级用法（代码实现）

2024-03-13 19:08
文章标签 代码 实现 android 用法 高级 objectanimator valueanimator

本文主要是介绍Android ValueAnimator和ObjectAnimator的高级用法（代码实现），希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

参考文章：http://blog.csdn.net/guolin_blog/article/details/43816093

一、ValueAnimator的高级用法

1.MainActivity.java

public class MainActivity extends  Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);//两个Point对象，现在需要将Point1通过动画平滑过度到Point2Point point1 = new Point(0, 0);  Point point2 = new Point(300, 300);  ValueAnimator anim = ValueAnimator.ofObject(new PointEvaluator(), point1, point2);  anim.setDuration(5000);  anim.start();  }}

2.MyAnimView.java 

public class MyAnimView extends View {  public static final float RADIUS = 50f;  private Point currentPoint;  private Paint mPaint;  public MyAnimView(Context context, AttributeSet attrs) {  super(context, attrs);  mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);  mPaint.setColor(Color.BLUE);  }  @Override  protected void onDraw(Canvas canvas) {  if (currentPoint == null) {  currentPoint = new Point(RADIUS, RADIUS);  drawCircle(canvas);  startAnimation();  } else {  drawCircle(canvas);  }  }  private void drawCircle(Canvas canvas) {  float x = currentPoint.getX();  float y = currentPoint.getY();  canvas.drawCircle(x, y, RADIUS, mPaint);  }  private void startAnimation() {  Point startPoint = new Point(RADIUS, RADIUS);  Point endPoint = new Point(getWidth() - RADIUS, getHeight() - RADIUS);  ValueAnimator anim = ValueAnimator.ofObject(new PointEvaluator(), startPoint, endPoint);  anim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {  @Override  public void onAnimationUpdate(ValueAnimator animation) {  currentPoint = (Point) animation.getAnimatedValue();  invalidate();  }  });  anim.setDuration(5000);  anim.start();  }  }

3.Point.java 

public class Point {  private float x;  private float y;  public Point(float x, float y) {  this.x = x;  this.y = y;  }  public float getX() {  return x;  }  public float getY() {  return y;  }  
}

4.PointEvaluator.java 

public class PointEvaluator implements TypeEvaluator{  @Override  public Object evaluate(float fraction, Object startValue, Object endValue) {  Point startPoint = (Point) startValue;  Point endPoint = (Point) endValue;  float x = startPoint.getX() + fraction * (endPoint.getX() - startPoint.getX());  float y = startPoint.getY() + fraction * (endPoint.getY() - startPoint.getY());  Point point = new Point(x, y);  return point;  }  }

5.布局文件：activity_main.xml 

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:layout_width="match_parent"  android:layout_height="match_parent"  >  <com.th.animationtest2.MyAnimView  android:layout_width="match_parent"  android:layout_height="match_parent" />  </RelativeLayout>


二、ObjectAnimator的高级用法

1.MainActivity.java

public class MainActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);//两个Point对象，现在需要将Point1通过动画平滑过度到Point2Point point1 = new Point(0, 0);  Point point2 = new Point(300, 300);  ValueAnimator anim = ValueAnimator.ofObject(new PointEvaluator(), point1, point2);  anim.setDuration(5000);  anim.start();  }}

2.Point.java 

public class Point {  private float x;  private float y;  public Point(float x, float y) {  this.x = x;  this.y = y;  }  public float getX() {  return x;  }  public float getY() {  return y;  }  
}

3.MyAnimView.java 

import android.animation.AnimatorSet;
import android.animation.ObjectAnimator;
import android.animation.ValueAnimator;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.View;public class MyAnimView extends View {  public static final float RADIUS = 50f;  private Point currentPoint;  private Paint mPaint;  public MyAnimView(Context context, AttributeSet attrs) {  super(context, attrs);  mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);  mPaint.setColor(Color.BLUE);  }  @Override  protected void onDraw(Canvas canvas) {  if (currentPoint == null) {  currentPoint = new Point(RADIUS, RADIUS);  drawCircle(canvas);  startAnimation();  } else {  drawCircle(canvas);  }  }  private void drawCircle(Canvas canvas) {  float x = currentPoint.getX();  float y = currentPoint.getY();  canvas.drawCircle(x, y, RADIUS, mPaint);  }  /*private void startAnimation() {  Point startPoint = new Point(RADIUS, RADIUS);  Point endPoint = new Point(getWidth() - RADIUS, getHeight() - RADIUS);  ValueAnimator anim = ValueAnimator.ofObject(new PointEvaluator(), startPoint, endPoint);  anim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {  @Override  public void onAnimationUpdate(ValueAnimator animation) {  currentPoint = (Point) animation.getAnimatedValue();  invalidate();  }  });  anim.setDuration(5000);  anim.start();  }  */private void startAnimation() {  Point startPoint = new Point(RADIUS, RADIUS);  Point endPoint = new Point(getWidth() - RADIUS, getHeight() - RADIUS);  ValueAnimator anim = ValueAnimator.ofObject(new PointEvaluator(), startPoint, endPoint);  anim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {  @Override  public void onAnimationUpdate(ValueAnimator animation) {  currentPoint = (Point) animation.getAnimatedValue();  invalidate();  }  });  //从蓝色到红色的动画过度，历时5秒ObjectAnimator anim2 = ObjectAnimator.ofObject(this, "color", new ColorEvaluator(),   "#0000FF", "#FF0000");  AnimatorSet animSet = new AnimatorSet();  animSet.play(anim).with(anim2);  animSet.setDuration(5000);  animSet.start();  }  private String color;  public String getColor() {  return color;  }  public void setColor(String color) {  this.color = color;  mPaint.setColor(Color.parseColor(color));  invalidate();  }  
}

4.PointEvaluator.java 

public class PointEvaluator implements TypeEvaluator{  @Override  public Object evaluate(float fraction, Object startValue, Object endValue) {  Point startPoint = (Point) startValue;  Point endPoint = (Point) endValue;  float x = startPoint.getX() + fraction * (endPoint.getX() - startPoint.getX());  float y = startPoint.getY() + fraction * (endPoint.getY() - startPoint.getY());  Point point = new Point(x, y);  return point;  }  }

5.ColorEvaluator.java 

public class ColorEvaluator implements TypeEvaluator {  private int mCurrentRed = -1;  private int mCurrentGreen = -1;  private int mCurrentBlue = -1;  @Override  public Object evaluate(float fraction, Object startValue, Object endValue) {  String startColor = (String) startValue;  String endColor = (String) endValue;  int startRed = Integer.parseInt(startColor.substring(1, 3), 16);  int startGreen = Integer.parseInt(startColor.substring(3, 5), 16);  int startBlue = Integer.parseInt(startColor.substring(5, 7), 16);  int endRed = Integer.parseInt(endColor.substring(1, 3), 16);  int endGreen = Integer.parseInt(endColor.substring(3, 5), 16);  int endBlue = Integer.parseInt(endColor.substring(5, 7), 16);  // 初始化颜色的值  if (mCurrentRed == -1) {  mCurrentRed = startRed;  }  if (mCurrentGreen == -1) {  mCurrentGreen = startGreen;  }  if (mCurrentBlue == -1) {  mCurrentBlue = startBlue;  }  // 计算初始颜色和结束颜色之间的差值  int redDiff = Math.abs(startRed - endRed);  int greenDiff = Math.abs(startGreen - endGreen);  int blueDiff = Math.abs(startBlue - endBlue);  int colorDiff = redDiff + greenDiff + blueDiff;  if (mCurrentRed != endRed) {  mCurrentRed = getCurrentColor(startRed, endRed, colorDiff, 0,  fraction);  } else if (mCurrentGreen != endGreen) {  mCurrentGreen = getCurrentColor(startGreen, endGreen, colorDiff,  redDiff, fraction);  } else if (mCurrentBlue != endBlue) {  mCurrentBlue = getCurrentColor(startBlue, endBlue, colorDiff,  redDiff + greenDiff, fraction);  }  // 将计算出的当前颜色的值组装返回  String currentColor = "#" + getHexString(mCurrentRed)  + getHexString(mCurrentGreen) + getHexString(mCurrentBlue);  return currentColor;  }  /** * 根据fraction值来计算当前的颜色。 */  private int getCurrentColor(int startColor, int endColor, int colorDiff,  int offset, float fraction) {  int currentColor;  if (startColor > endColor) {  currentColor = (int) (startColor - (fraction * colorDiff - offset));  if (currentColor < endColor) {  currentColor = endColor;  }  } else {  currentColor = (int) (startColor + (fraction * colorDiff - offset));  if (currentColor > endColor) {  currentColor = endColor;  }  }  return currentColor;  }  /** * 将10进制颜色值转换成16进制。 */  private String getHexString(int value) {  String hexString = Integer.toHexString(value);  if (hexString.length() == 1) {  hexString = "0" + hexString;  }  return hexString;  }  }

6.布局文件：activity_main.xml 

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:layout_width="match_parent"  android:layout_height="match_parent"  >  <com.th.objectanimatortest.MyAnimView  android:layout_width="match_parent"  android:layout_height="match_parent" />  </RelativeLayout>


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