我的textview有问题。滚动页面时，textview始终隐藏在Actionbar后面，但我希望它保持在屏幕顶部。
有图片示例：Screenshot
以下是activity_main.xml和MainActivity.java文件中的代码。
activity_main.xml中
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
android:fitsSystemWindows="true"
android:layout_height="280dip"
app:elevation="0dip"
android:background="@color/colorLightGreen"
app:expanded="true">
<android.support.design.widget.CollapsingToolbarLayout
android:id="@+id/collapsing_toolbar"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:contentScrim="#76BC18"
app:layout_scrollFlags="scroll|exitUntilCollapsed"
app:titleEnabled="false"
app:statusBarScrim="@color/colorLightGreen">
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="centerCrop"
android:background="@drawable/salmon"
android:id="@+id/profile_id"
app:layout_collapseMode="parallax"/>
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="56dip"
app:layout_collapseMode="pin" />
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:text="@string/food"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/textView"
android:textAppearance="@style/expandedappbar"
android:background="@color/colorLightGreen" />
</LinearLayout>
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="30dip"
android:paddingTop="35dip"
android:paddingLeft="15dip"
android:background="@android:color/background_light">
<LinearLayout
android:orientation="horizontal"
android:layout_width="wrap_content"
android:layout_height="match_parent">
<TextView
android:text="@string/cena_pro_studenta"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/textView3"
android:layout_weight="1"
android:textAppearance="@style/collapsedappbar"/>
<TextView
android:text="37 Kč"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/textView2"
android:layout_weight="1"
android:paddingLeft="7dip"
android:textAppearance="@style/collapsedappbar" />
</LinearLayout>
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:text="@string/alergeny"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/textView5"
android:textAppearance="@style/collapsedappbar"
android:layout_marginTop="10dip" />
<ListView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/listView"
android:layout_marginTop="15dip"
android:divider="@null"
android:dividerHeight="0dip"
android:layout_marginLeft="0dip" />
</LinearLayout>
</LinearLayout>
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingTop="30dip"
android:background="#ECEFF0"
android:paddingBottom="15dip"
android:paddingLeft="15dip">
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:layout_height="match_parent"
app:srcCompat="@drawable/smile"
android:id="@+id/imageView"
android:scaleType="fitStart"
android:layout_width="45dip" />
<TextView
android:text="@string/Prumer"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/textView4"
android:layout_weight="1"
android:textAppearance="@style/collapsedappbar"
android:layout_marginLeft="15dip" />
</LinearLayout>
<LinearLayout
android:orientation="horizontal"
android:layout_width="wrap_content"
android:layout_height="match_parent">
<Button
android:text="@string/hodnotenie"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/button2"
android:layout_weight="1"
android:background="@android:color/transparent"
android:theme="@style/AppTheme.Button"
android:layout_marginTop="5dip" />
<Button
android:text="@string/pridej_foto"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/button"
android:layout_weight="1"
android:background="@android:color/transparent"
android:theme="@style/AppTheme.Button"
android:layout_marginLeft="15dip"
android:layout_marginTop="5dip" />
</LinearLayout>
</LinearLayout>
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="30dip"
android:paddingTop="30dip"
android:paddingLeft="15dip"
android:background="@android:color/background_light">
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
app:srcCompat="@drawable/alert"
android:id="@+id/imageView2"
android:layout_height="25dip"
android:layout_width="45dip"
android:scaleType="fitStart"/>
<TextView
android:text="@string/OpravaText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/textView6"
android:layout_weight="1"
android:textAppearance="@style/collapsedappbar"
android:layout_marginLeft="15dip" />
</LinearLayout>
<LinearLayout
android:orientation="horizontal"
android:layout_width="wrap_content"
android:layout_height="match_parent">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/button3"
android:layout_weight="1"
android:text="@string/nahlasit_chybu"
android:background="@android:color/transparent"
android:theme="@style/AppTheme.Button"
android:layout_marginLeft="60dip"
android:layout_marginTop="5dip" />
</LinearLayout>
</LinearLayout>
</LinearLayout>
</android.support.v4.widget.NestedScrollView>
</android.support.design.widget.CoordinatorLayout>
MainActivity.java
import android.os.Bundle;
import android.support.design.widget.CollapsingToolbarLayout;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListAdapter;
import android.widget.ListView;
public class MainActivity extends AppCompatActivity {
private CollapsingToolbarLayout collapsingToolbarLayout = null;
private ListView listView;
String[] listItems = {"Obiloviny obsahujíci lepek" , "Podzemnice ojelná (arašidy)"};
Integer[] imgid={
R.drawable.pic1,
R.drawable.pic2,
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
ActionBar actionBar = getSupportActionBar();
actionBar.setDisplayHomeAsUpEnabled(true);
actionBar.setTitle(null);
collapsingToolbarLayout = (CollapsingToolbarLayout) findViewById(R.id.collapsing_toolbar);
CustomAdapter adapter=new CustomAdapter(this, listItems, imgid);
listView = (ListView) findViewById(R.id.listView);
listView.setAdapter(adapter);
setListViewHeightBasedOnChildren(listView);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.menu, menu);
return true;
}
/* Metoda pre zobrazenie celého ListView */
public static void setListViewHeightBasedOnChildren(ListView listView) {
ListAdapter listAdapter = listView.getAdapter();
if (listAdapter == null) {
return;
}
int totalHeight = 0;
for (int i = 0; i < listAdapter.getCount(); i++) {
View listItem = listAdapter.getView(i, null, listView);
listItem.measure(0, 0);
totalHeight += listItem.getMeasuredHeight();
}
ViewGroup.LayoutParams params = listView.getLayoutParams();
params.height = totalHeight
+ (listView.getDividerHeight() * (listAdapter.getCount() - 1));
listView.setLayoutParams(params);
}
}