[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