android中的动画视图高度

Question

我有一个带有按钮的视图持有者，可以在同一布局中切换其他视图的可见性（我用 id locals_additional_filters切换视图的可见性） 。 现在通过使视图可见，父布局高度（ id 是host_filter_holder ）正在改变，我的问题是如何为父布局高度设置动画？

这是我的 xml：

<LinearLayout
        android:id="@+id/host_filter_holder"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@drawable/red_borders_btn"
        android:orientation="vertical">

        <Button
            android:id="@+id/find_host_filter"
            android:layout_width="match_parent"
            android:layout_height="45dp"
            android:text="@string/more_filters"
            android:background="@null"
            android:textColor="@color/red_borders"
            android:textSize="16sp" />

        <LinearLayout
            android:id="@+id/locals_additional_filters"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="10dp"
            android:orientation="vertical"
            android:padding="10dp"
            android:animateLayoutChanges="true"
            android:visibility="gone">

            <RadioGroup
                android:id="@+id/locals_gender_group"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="horizontal">

                <RadioButton
                    android:id="@+id/female"
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:layout_weight="1"
                    android:checked="true"
                    android:text="Female"
                    android:textColor="@color/black" />

                <RadioButton
                    android:id="@+id/male"
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:layout_weight="1"
                    android:text="Male"
                    android:textColor="@color/black" />
            </RadioGroup>

            <EditText
                style="@style/NoBottomLineEditText"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginBottom="10dp"
                android:clickable="true"
                android:drawableEnd="@drawable/ic_arrow"
                android:drawableRight="@drawable/ic_arrow"
                android:hint="Search your friends in 2km" />

            <TextView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="@string/interests"
                android:textColor="@color/dark_gray"
                android:textSize="14sp" />

            <android.support.v7.widget.RecyclerView
                android:id="@+id/locals_filter_recycle"
                android:layout_width="match_parent"
                android:layout_height="40dp" />
        </LinearLayout>

    </LinearLayout>

Answer 1

使用 Value animator 非常简单，您可以这样做：

myView.animate().scaleY( anyValue ).setDuration( durationInMills );

Answer 2

使用 ValueAnimator 或 ObjectAnimator：

LinearLayout container = findViewById(R.id.host_filter_holder);
Button btn = findViewById(find_host_filter);
LinearLayout changeBox = findViewById(R.id.locals_additional_filters);
 ValueAnimator animator = ValueAnimator.ofInt(btn.getHeight() + 
                changeBox.getHeight(),btn.getHeight()); 


animator.setTarget(container );  
animator.setDuration(1000).start();  
animator.addUpdateListener(new AnimatorUpdateListener()  
{  
    @Override  
    public void onAnimationUpdate(ValueAnimator animation)  
    {   
        LayoutParams layoutparams = container.getLayoutParams();
        layoutparams.height = animation.getAnimatedValue();
        container.setLayoutParams(layoutparams );
    }  
});