[2017-8-02]Android Learning Day8

自定义动画效果

新建一个customAnim类

 package com.liwenchi.myapplication;

 import android.view.animation.Animation;
 import android.view.animation.Transformation;

 import static java.lang.Math.*;

 /**
  * Created by VULCAN on 2017/8/2.
  */

 public class CustomAnim extends Animation {

     @Override
     protected void applyTransformation(float interpolatedTime, Transformation t) {
         //interpolatedTime代表补间动画时间，从0~1，0代表开始，1代表结束
         //t代表变化对象
         float p = interpolatedTime;
         super.applyTransformation(interpolatedTime, t);
         //System.out.println(interpolatedTime);
         //t.setAlpha(interpolatedTime);设置透明度
         //t.getMatrix().setTranslate(0, -300*p);设置位置
         t.getMatrix().setTranslate((float) (sin(p*2*6.28*p)*50), 0);
     }
 }

其中，重写applyTransformation()方法

MainActivity.java里创建一个CustomAnim动画

 package com.liwenchi.myapplication;

 import android.support.v7.app.AppCompatActivity;
 import android.os.Bundle;
 import android.view.View;
 import android.view.animation.AlphaAnimation;
 import android.view.animation.Animation;
 import android.view.animation.AnimationSet;
 import android.view.animation.AnimationUtils;
 import android.view.animation.RotateAnimation;
 import android.view.animation.ScaleAnimation;
 import android.view.animation.TranslateAnimation;
 import android.widget.Button;
 import android.widget.CheckBox;
 import android.widget.CompoundButton;
 import android.widget.TextView;

 public class MainActivity extends AppCompatActivity {

     private CustomAnim ca;

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
         slove();
     }

     private void slove() {
         ca = new CustomAnim();
         ca.setDuration(1000);
         findViewById(R.id.btn).setOnClickListener(new View.OnClickListener() {

             @Override
             public void onClick(View v) {
                 v.startAnimation(ca);
             }
         });
     }
 }
 //v.startAnimation(AnimationUtils.loadAnimation(MainActivity.this, R.anim.ta));

这样就自定义了一个“摇头”的动画效果