动画更改LayoutParams(RelativeLayout)

Question

当我点击RelativeLayout时,它会改变大小.如何将此更改设为动画？所以看起来矩形会变成全屏？

我的布局:

<RelativeLayout 
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" 
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin" 
tools:context=".MainActivity"
android:background="#ff000000">

<RelativeLayout
    android:id="@+id/srLayout"
    android:layout_width="62.5dp"
    android:layout_height="132.5dp"
    android:layout_alignParentTop="true"
    android:layout_alignParentEnd="false"
    android:layout_alignParentRight="true"
    android:layout_marginRight="10dp"
    android:layout_marginEnd="10dp"
    android:layout_marginTop="10dp"
    android:clickable="true"
    android:onClick="sleepRoom"
    android:background="#ffffffff"></RelativeLayout>

</RelativeLayout>

代码:

public void sleepRoom(View view) {
    RelativeLayout sr = (RelativeLayout) findViewById(view.getId());
    RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) sr.getLayoutParams();
    params.height = RelativeLayout.LayoutParams.MATCH_PARENT;
    params.width = RelativeLayout.LayoutParams.MATCH_PARENT;
    sr.setLayoutParams(params);
}

Answer 1

对我有用的简单技巧：

新增：

android:animateLayoutChanges="true"

到您要更改其layoutParams的视图的xml。

然后，在更改参数之前，将以下代码行添加到Java / Kotlin代码中：

Java：

((ViewGroup) sr).getLayoutTransition().enableTransitionType(LayoutTransition.CHANGING);

科特林：

(sr as ViewGroup).layoutTransition.enableTransitionType(LayoutTransition.CHANGING)

Answer 2

要在这种情况下显式动画,您sleepRoom()应该看起来像这样.

public void sleepRoom(View view) {
    final RelativeLayout sr = (RelativeLayout) view;
    RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) sr.getLayoutParams();
    params.height = RelativeLayout.LayoutParams.MATCH_PARENT;
    params.width = RelativeLayout.LayoutParams.MATCH_PARENT;
    sr.setLayoutParams(params);

    PropertyValuesHolder pvhLeft = PropertyValuesHolder.ofInt("left", 0, 1);
    PropertyValuesHolder pvhTop = PropertyValuesHolder.ofInt("top", 0, 1);
    PropertyValuesHolder pvhRight = PropertyValuesHolder.ofInt("right", 0, 1);
    PropertyValuesHolder pvhBottom = PropertyValuesHolder.ofInt("bottom", 0, 1);
    PropertyValuesHolder pvhRoundness = PropertyValuesHolder.ofFloat("roundness", 0, 1);


    final Animator collapseExpandAnim = ObjectAnimator.ofPropertyValuesHolder(sr, pvhLeft, pvhTop,
            pvhRight, pvhBottom, pvhRoundness);
    collapseExpandAnim.setupStartValues();

    sr.getViewTreeObserver().addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {
        @Override
        public boolean onPreDraw() {
            sr.getViewTreeObserver().removeOnPreDrawListener(this);
            collapseExpandAnim.setupEndValues();
            collapseExpandAnim.start();
            return false;
        }
    });
}

但是,通常android:animateLayoutChanges="true"应该工作.

有关Chet Haase男士的详细信息,请参阅:https://www.youtube.com/watch？v = 55wLsaWpQ4g