[2017-8-02]Android Learning Day8

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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));