Animator 動畫第一次播放正常，之後播放都不正常的問題解決

問題描述

　　第一次點選圖檔動畫播放正常，在點選文字之後，圖檔沒有顯示出來，點選空白，播放動畫，顯示文字。

　　寫了一個卡片翻轉的動畫，代碼如下:

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_gravity="center"
    android:background="#F2F2F2">

    <FrameLayout
        android:layout_width="252dp"
        android:layout_height="336dp"
        android:layout_gravity="center">

        <ImageView
            android:id="@+id/activity_main_image_iv"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:src="@mipmap/result" />

        <TextView
            android:id="@+id/activity_main_text_tv"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:background="#247BA0"
            android:gravity="center"
            android:text="确定"
            android:textColor="@android:color/white"
            android:textSize="36sp"
            android:visibility="gone" />

    </FrameLayout>


</FrameLayout>
           

MainActivity.java

package com.zm.animatorerror;

import android.animation.Animator;
import android.animation.AnimatorInflater;
import android.animation.AnimatorListenerAdapter;
import android.animation.AnimatorSet;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    private ImageView iv_image;
    private TextView tv_text;

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

    private void initView() {
        iv_image = (ImageView) findViewById(R.id.activity_main_image_iv);
        tv_text = (TextView) findViewById(R.id.activity_main_text_tv);
        iv_image.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                tv_text.setVisibility(View.VISIBLE);
                AnimatorSet inAnimator = (AnimatorSet) AnimatorInflater.loadAnimator(MainActivity.this, R.animator.rotate_in_anim);
                AnimatorSet outAnimator = (AnimatorSet) AnimatorInflater.loadAnimator(MainActivity.this, R.animator.rotate_out_anim);
                int distance = 16000;
                float scale = getResources().getDisplayMetrics().density * distance;
                iv_image.setCameraDistance(scale);
                tv_text.setCameraDistance(scale);
                outAnimator.setTarget(iv_image);
                inAnimator.setTarget(tv_text);
                outAnimator.start();
                inAnimator.start();
                outAnimator.addListener(new AnimatorListenerAdapter() {
                    @Override
                    public void onAnimationEnd(Animator animation) {
                        super.onAnimationEnd(animation);
                        iv_image.setVisibility(View.GONE);
                    }
                });
            }
        });
        tv_text.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                tv_text.setVisibility(View.GONE);
                iv_image.setVisibility(View.VISIBLE);
            }
        });
    }
}
           

問題原因

　　Animator 動畫會修改控件的屬性值，第一次動畫結束之後，控制的屬性值就是動畫播放完的屬性，是以動畫顯示不正确。

解決方法

　　為動畫設定播放監聽，在動畫結束之後，将控件的屬性值設定為原始狀态。

　　修改代碼如下：

private void initView() {
        iv_image = (ImageView) findViewById(R.id.activity_main_image_iv);
        tv_text = (TextView) findViewById(R.id.activity_main_text_tv);
        iv_image.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                tv_text.setVisibility(View.VISIBLE);
                AnimatorSet inAnimator = (AnimatorSet) AnimatorInflater.loadAnimator(MainActivity.this, R.animator.rotate_in_anim);
                AnimatorSet outAnimator = (AnimatorSet) AnimatorInflater.loadAnimator(MainActivity.this, R.animator.rotate_out_anim);
                int distance = 16000;
                float scale = getResources().getDisplayMetrics().density * distance;
                iv_image.setCameraDistance(scale);
                tv_text.setCameraDistance(scale);
                outAnimator.setTarget(iv_image);
                inAnimator.setTarget(tv_text);
                outAnimator.start();
                inAnimator.start();
                outAnimator.addListener(new AnimatorListenerAdapter() {
                    @Override
                    public void onAnimationEnd(Animator animation) {
                        super.onAnimationEnd(animation);
                        iv_image.setVisibility(View.GONE);
      ***********************************修改部分**************************************
                        iv_image.setAlpha(1.0f);
                        iv_image.setRotationY(0.0f);
      ***********************************修改部分**************************************
                    }
                });
            }
        });
        tv_text.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                tv_text.setVisibility(View.GONE);
                iv_image.setVisibility(View.VISIBLE);
            }
        });
    }