为什么我不能扩展我的布局高度大于＆＃39; MATCH_PARENT＆＃39;

Question

我希望自己的应用能够倾听＆＃39;点击＆＃39;事件然后隐藏头部并扩展身体。

但似乎我只能将身体扩展到＆＃39; MATCH_PARENT＆＃39;最多。 当我将内容扩展到小于＆＃39; MATCH_PARENT＆＃39;的高度时，代码可以正常工作，但如果高度大于＆＃39; MATCH_PARENT＆＃39;，那么它就无法正常工作。

这是我的布局XML文件：

<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="#000">

<RelativeLayout
    android:id="@+id/header"
    android:layout_width="match_parent"
    android:layout_height="100dp"
    android:background="#e67e22"></RelativeLayout>
<RelativeLayout
    android:id="@+id/content"
    android:layout_below="@id/header"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#e74c3c"
    ></RelativeLayout>
</RelativeLayout>

这是我的活动：

公共类MainActivity扩展了ActionBarActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    final RelativeLayout header = (RelativeLayout) findViewById(R.id.header);
    final RelativeLayout content = (RelativeLayout) findViewById(R.id.content);

    content.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            header.animate().translationY(-header.getMeasuredHeight());
            content.animate().translationY(-header.getMeasuredHeight());
//          content.measure(RelativeLayout.LayoutParams.MATCH_PARENT, RelativeLayout.LayoutParams.MATCH_PARENT);
            final int originalHeight = content.getMeasuredHeight();
            final int targetHeight = content.getMeasuredHeight() + header.getMeasuredHeight();

            Animation a = new Animation()
            {
                @Override
                protected void applyTransformation(float interpolatedTime, Transformation t) {
                    content.getLayoutParams().height = interpolatedTime == 1
                            ? targetHeight
                            : (int)(header.getMeasuredHeight()*interpolatedTime + originalHeight);
                    content.requestLayout();
                }

                @Override
                public boolean willChangeBounds() {
                    return true;
                }
            };

            a.setDuration(500);
            content.startAnimation(a);
        }
    });
}

点击之前

：

点击后

：

Answer 1

是的，用LinearLayout替换外部RelativeLayout解决了我的问题。