Debug完成图：

Debug完成图

昨天晚上开始学一下这个揭露动画，准备用在项目中做一个转场，啃完了API之后开始写个小demo，距离跑成功一步之遥的当儿，出了个bug，就怎么点击按钮都没用。

首先上bug图：

bug：怎么点击按钮都没用，每点击一次都会出现下面的报错（2040）：

11-07 19:20:49.665 2454-2454/? I/Finsky: [1] com.google.android.finsky.services.j.a(149): Installation state replication succeeded.11-07 19:20:49.711 7448-7448/? E/hei: 204011-07 19:20:49.718 1350-1371/? W/audio_hw_generic: Not supplying enough data to HAL, expected position 5613338 , only wrote 561312011-07 19:20:50.376 7448-7448/? E/hei: 204011-07 19:20:50.992 7448-7448/? E/hei: 204011-07 19:20:51.591 7448-7448/? E/hei: 204011-07 19:20:54.790 1350-1372/? W/audio_hw_generic: Not supplying enough data to HAL, expected position 6098164 , only wrote 585648011-07 19:20:58.322 7448-7448/? E/hei: 204011-07 19:20:58.328 1350-1371/? W/audio_hw_generic: Not supplying enough data to HAL, expected position 5856667 , only wrote 585648011-07 19:21:01.540 1350-1372/? W/audio_hw_generic: Not supplying enough data to HAL, expected position 6162708 , only wrote 6010560

activity.java全文：

package com.lwp.justtest;import android.animation.Animator;import android.animation.AnimatorListenerAdapter;import android.support.design.widget.FloatingActionButton;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.util.Log;import android.view.View;import android.view.ViewAnimationUtils;public class MainActivity extends AppCompatActivity implements View.OnClickListener {    boolean flag = false;    FloatingActionButton fab;    private View mPuppet;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mPuppet = findViewById(R.id.view_puppet);        fab = (FloatingActionButton)findViewById(R.id.fab);        fab.setOnClickListener(this);    }    @Override    public void onClick(View v) {        doRevealAnimation();    }    private void doRevealAnimation() {        int[] vLocation = new int[2];        fab.getLocationInWindow(vLocation);        int centerX = vLocation[0] + fab.getMeasuredWidth() / 2;        int centerY = vLocation[1] + fab.getMeasuredHeight() / 2;        int height = mPuppet.getHeight();        int width = mPuppet.getWidth();        int maxRradius = (int) Math.hypot(height, width);        Log.e("hei", maxRradius + "");        if (flag) {            Animator animator = ViewAnimationUtils.createCircularReveal(mPuppet, centerX, centerY, maxRradius, 0);            animator.setDuration(1000);            animator.addListener(new AnimatorListenerAdapter() {                @Override                public void onAnimationEnd(Animator animation) {                    super.onAnimationEnd(animation);                    mPuppet.setVisibility(View.GONE);                }            });            animator.start();            flag = false;        } else {            Animator animator = ViewAnimationUtils.createCircularReveal(mPuppet, centerX, centerY, 0, maxRradius);            animator.setDuration(1000);            animator.addListener(new Animator.AnimatorListener() {                @Override                public void onAnimationStart(Animator animation) {                    mPuppet.setVisibility(View.VISIBLE);                }                @Override                public void onAnimationEnd(Animator animation) {                }                @Override                public void onAnimationCancel(Animator animation) {                }                @Override                public void onAnimationRepeat(Animator animation) {                }            });            animator.start();            flag = true;        }    }}

layout.xml全文：

观众朋友们，这个看出毛病了吗。

我想了一下，额，会不会我的View没有设置颜色啊。。好的试了一下，果然是，可以说是很鬼畜了。。

layout.xml里边的View控件改成下面这样子，再次运行程序就成了（发现2040还是会报错，但是动画算是完美跑出来了，所以小伙伴们这里记得设置android:background以及android:visibility噢）：

效果图如下：