设置EditText向左或向右可绘制动画

import android.animation.ObjectAnimator;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.drawable.Drawable;
import android.support.v7.widget.AppCompatEditText;
import android.util.AttributeSet;

public class AnimatedEditText extends AppCompatEditText {
    private Drawable leftDrawable;
    private ObjectAnimator animator;

    public AnimatedEditText(Context context) {
        super(context);
        init();
    }

    public AnimatedEditText(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public AnimatedEditText(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init();
    }

    private void init() {
        // 获取左侧Drawable
        leftDrawable = getCompoundDrawables()[0];
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);

        // 绘制左侧Drawable
        if (leftDrawable != null) {
            leftDrawable.setBounds(0, 0, leftDrawable.getIntrinsicWidth(), leftDrawable.getIntrinsicHeight());
            canvas.save();
            canvas.translate(getPaddingLeft(), getPaddingTop() + (getHeight() - leftDrawable.getIntrinsicHeight()) / 2);
            leftDrawable.draw(canvas);
            canvas.restore();
        }
    }

    public void startAnimation(boolean isLeft) {
        // 根据isLeft参数决定向左或向右的动画效果
        float start = isLeft ? 0 : getWidth() - getPaddingRight() - leftDrawable.getIntrinsicWidth();
        float end = isLeft ? getWidth() - getPaddingRight() - leftDrawable.getIntrinsicWidth() : 0;

        // 创建属性动画
        animator = ObjectAnimator.ofFloat(this, "translationX", start, end);
        animator.setDuration(1000);
        animator.start();
    }

    public void stopAnimation() {
        // 停止动画
        if (animator != null && animator.isRunning()) {
            animator.cancel();
        }
    }
}