Keyframe类-动画中关键帧概念

package com.loaderman.customviewdemo;

import android.animation.Animator;
import android.animation.Keyframe;
import android.animation.ObjectAnimator;
import android.animation.PropertyValuesHolder;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.ImageView;

public class MainActivity extends AppCompatActivity {
    ImageView mImg;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mImg = (ImageView) findViewById(R.id.img);

        findViewById(R.id.start_anim).setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {

                /**
                 * 左右震动效果
                 */
                Keyframe frame0 = Keyframe.ofFloat(0f, 0);
                Keyframe frame1 = Keyframe.ofFloat(0.1f, -20f);
                Keyframe frame2 = Keyframe.ofFloat(0.2f, 20f);
                Keyframe frame3 = Keyframe.ofFloat(0.3f, -20f);
                Keyframe frame4 = Keyframe.ofFloat(0.4f, 20f);
                Keyframe frame5 = Keyframe.ofFloat(0.5f, -20f);
                Keyframe frame6 = Keyframe.ofFloat(0.6f, 20f);
                Keyframe frame7 = Keyframe.ofFloat(0.7f, -20f);
                Keyframe frame8 = Keyframe.ofFloat(0.8f, 20f);
                Keyframe frame9 = Keyframe.ofFloat(0.9f, -20f);
                Keyframe frame10 = Keyframe.ofFloat(1, 0);
                PropertyValuesHolder frameHolder1 = PropertyValuesHolder.ofKeyframe("rotation", frame0, frame1, frame2, frame3, frame4, frame5, frame6, frame7, frame8, frame9, frame10);

                /**
                 * scaleX放大1.1倍
                 */
                Keyframe scaleXframe0 = Keyframe.ofFloat(0f, 1);
                Keyframe scaleXframe1 = Keyframe.ofFloat(0.1f, 1.1f);
                Keyframe scaleXframe9 = Keyframe.ofFloat(0.9f, 1.1f);
                Keyframe scaleXframe10 = Keyframe.ofFloat(1, 1);
                PropertyValuesHolder frameHolder2 = PropertyValuesHolder.ofKeyframe("ScaleX", scaleXframe0, scaleXframe1, scaleXframe9, scaleXframe10);

                /**
                 * scaleY放大1.1倍
                 */
                Keyframe scaleYframe0 = Keyframe.ofFloat(0f, 1);
                Keyframe scaleYframe1 = Keyframe.ofFloat(0.1f, 1.1f);
                Keyframe scaleYframe9 = Keyframe.ofFloat(0.9f, 1.1f);
                Keyframe scaleYframe10 = Keyframe.ofFloat(1, 1);
                PropertyValuesHolder frameHolder3 = PropertyValuesHolder.ofKeyframe("ScaleY", scaleYframe0, scaleYframe1, scaleYframe9, scaleYframe10);

                /**
                 * 构建动画
                 */
                Animator animator = ObjectAnimator.ofPropertyValuesHolder(mImg, frameHolder1, frameHolder2, frameHolder3);
                animator.setDuration(1000);
                animator.start();
            }
        });
    }
}

效果: