Android 动画ObjectAnimator中height和translationY

Love The Way You Lie 2022-11-29 13:25 271阅读 0赞

动画实现两种方式：

ObjectAnimator animator1 = ObjectAnimator.ofFloat(tvContent1, View.TRANSLATION\_Y, hFrom, hTo);

ObjectAnimator animator1 = ObjectAnimator.ofInt(wrapper, “height”, hFrom, hTo);

但是效果完全不同：

如下图:  
![在这里插入图片描述][20200821203319991.gif_pic_center]

public class SecondActivity extends AppCompatActivity { 
    
        private TextView tvTitle1, tvTitle2;
        private TextView tvContent1, tvContent2;
        private ViewWrapper wrapper;
        private int height1, height2;
        private boolean isAnimating1, isAnimating2;
    
        @Override
        protected void onCreate(Bundle savedInstanceState) { 
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_second);
            tvTitle1 = (TextView) findViewById(R.id.tv_title);
            tvContent1 = (TextView) findViewById(R.id.tv_content);
            tvTitle2 = (TextView) findViewById(R.id.tv_title2);
            tvContent2 = (TextView) findViewById(R.id.tv_content2);
            wrapper = new ViewWrapper(tvContent2);
            initHeight();
            tvTitle1.setOnClickListener(new View.OnClickListener() { 
                @Override
                public void onClick(View view) { 
                    startAnimator1();
                }
            });
            tvTitle2.setOnClickListener(new View.OnClickListener() { 
                @Override
                public void onClick(View view) { 
                    startAnimator2();
                }
            });
    
        }
    
        private void initHeight() { 
            tvContent1.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() { 
                @Override
                public void onGlobalLayout() { 
                    height1 = tvContent1.getHeight();
                    tvContent1.getViewTreeObserver().removeOnGlobalLayoutListener(this);
                }
            });
            tvContent2.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() { 
                @Override
                public void onGlobalLayout() { 
                    height2 = tvContent2.getHeight();
                    tvContent2.getViewTreeObserver().removeOnGlobalLayoutListener(this);
                }
            });
        }
    
        private void startAnimator1() { 
            if (isAnimating1) return;
            final boolean isExpand = (View.VISIBLE == tvContent1.getVisibility());
            int hFrom = 0, hTo = 0;
            if (!isExpand) { //已显示，需要隐藏
                hFrom = -height1;
            } else { //已隐藏 需要显示
                hTo = -height1;
            }
            ObjectAnimator animator1 = ObjectAnimator.ofFloat(tvContent1, View.TRANSLATION_Y, hFrom, hTo);
            animator1.setDuration(600);
            animator1.setInterpolator(new AccelerateDecelerateInterpolator());
            tvContent1.setVisibility(View.VISIBLE);
            animator1.addListener(new AnimatorListenerAdapter() { 
                @Override
                public void onAnimationStart(Animator animation) { 
                    super.onAnimationStart(animation);
                    isAnimating1 = true;
                }
    
                @Override
                public void onAnimationEnd(Animator animation) { 
                    super.onAnimationEnd(animation);
                    isAnimating1 = false;
                    tvContent1.setVisibility(isExpand ? View.GONE : View.VISIBLE);
                }
            });
            animator1.start();
        }
    
        private void startAnimator2() { 
            if (isAnimating2) return;
            final boolean isExpand = (View.VISIBLE == tvContent2.getVisibility());
            int hFrom = 0, hTo = 0;
            if (isExpand) { //已显示，需要隐藏
                hFrom = height2;
            } else { //已隐藏 需要显示
                hTo = height2;
            }
            ObjectAnimator animator2 = ObjectAnimator.ofInt(wrapper, "height", hFrom, hTo);
            animator2.setDuration(600);
            animator2.setInterpolator(new AccelerateDecelerateInterpolator());
            tvContent2.setVisibility(View.VISIBLE);
            animator2.addListener(new AnimatorListenerAdapter() { 
                @Override
                public void onAnimationStart(Animator animation) { 
                    super.onAnimationStart(animation);
                    isAnimating2 = true;
                }
    
                @Override
                public void onAnimationEnd(Animator animation) { 
                    super.onAnimationEnd(animation);
                    isAnimating2 = false;
                    tvContent2.setVisibility(isExpand ? View.GONE : View.VISIBLE);
                }
            });
            animator2.start();
        }
    }

其中 高度ofInt时 用到属性动画 包装类：

/** * 属性动画view包装类 */
    public class ViewWrapper implements Serializable { 
        private View mTarget;
    
        public ViewWrapper(View target) { 
            mTarget = target;
        }
        
        public int getWidth() { 
            return mTarget.getLayoutParams().width;
        }
        
        public void setWidth(int width) { 
            mTarget.getLayoutParams().width = width;
            mTarget.requestLayout();
        }
        
        public int getHeight() { 
            return mTarget.getLayoutParams().height;
        }
        
        public void setHeight(int height) { 
            mTarget.getLayoutParams().height = height;
            mTarget.requestLayout();
        }
    }

[20200821203319991.gif_pic_center]: /images/20221124/c0848d65ab52400f88cba45aeed93da4.png