Android 动画ObjectAnimator中height和translationY

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:

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();    }}

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