将视图从0dp宽度动画化为MATCH_PARENT

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <View
        android:id="@+id/myView"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:background="#FF0000" />

</LinearLayout>

View myView = findViewById(R.id.myView);
ValueAnimator animator = ValueAnimator.ofInt(0, ViewGroup.LayoutParams.MATCH_PARENT);
animator.setDuration(1000); // 设置动画持续时间
animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
    @Override
    public void onAnimationUpdate(ValueAnimator animation) {
        int value = (int) animation.getAnimatedValue();
        ViewGroup.LayoutParams layoutParams = myView.getLayoutParams();
        layoutParams.width = value;
        myView.setLayoutParams(layoutParams);
    }
});
animator.start(); // 启动动画