在我的应用程序中，我使用底部工作表和底部导航栏，其中底部工作表向上滑动（扩展）操作无效，因此需要一些建议才能再次滑动工作。
注意：扩展底部工作表会在按钮单击时以编程方式工作，但它不会在滑动时展开。
这里更新是我的布局 `
<?xml version="1.0" encoding="utf-8"?><!--suppress XmlUnusedNamespaceDeclaration -->
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:map="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent">
<fragment
android:id="@+id/map"
android:name="com.google.android.gms.maps.SupportMapFragment"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<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:fitsSystemWindows="true"
tools:context=".TabActivity">
<android.support.design.widget.BottomNavigationView
android:id="@+id/navigation"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_gravity="bottom"
android:animateLayoutChanges="true"
android:animationCache="true"
android:background="@android:color/white"
android:clickable="true"
android:focusable="true"
android:hapticFeedbackEnabled="true"
android:isScrollContainer="true"
android:overScrollMode="always"
app:menu="@menu/bottom_nav" />
<LinearLayout
android:id="@+id/bottom_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center|bottom"
android:background="@android:color/transparent"
android:orientation="vertical"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
app:behavior_hideable="false"
app:behavior_peekHeight="20dp"
app:elevation="10dp"
app:layout_behavior="@string/bottom_sheet_behavior">
<ImageButton
android:id="@+id/up"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@android:color/transparent"
map:srcCompat="@drawable/ic_up"
android:contentDescription="@string/upwards" />
<android.support.design.widget.TabLayout
android:id="@+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@android:color/white"
android:clickable="true"
android:focusable="true"
app:tabMode="scrollable">
<android.support.design.widget.TabItem
android:id="@+id/tab1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/temples" />
<android.support.design.widget.TabItem
android:id="@+id/tab2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/mosques" />
<android.support.design.widget.TabItem
android:id="@+id/tab3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/church" />
<android.support.design.widget.TabItem
android:id="@+id/tab5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/historic_places" />
</android.support.design.widget.TabLayout>
<android.support.v4.view.ViewPager
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="20dp"
android:background="#e6ffffff"
android:clickable="true"
android:fadeScrollbars="true"
android:fadingEdge="horizontal|vertical"
android:focusable="true"
android:isScrollContainer="true"
app:layout_behavior="@string/appbar_scrolling_view_behavior" />
</LinearLayout>
</android.support.design.widget.CoordinatorLayout>
</android.support.design.widget.CoordinatorLayout>
`
这是java代码 `
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//initializing bottom sheet
View bottomSheet = findViewById(R.id.bottom_layout);
behavior = BottomSheetBehavior.from(bottomSheet);
// Set up the ViewPager with the sections adapter.
ViewPager mViewPager = findViewById(R.id.container);
mViewPager.setAdapter(mSectionsPagerAdapter);
/*if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
mViewPager.setContextClickable(true);
TabLayout tabLayout = findViewById(R.id.tabs);
tabLayout.addOnTabSelectedListener(new TabLayout.ViewPagerOnTabSelectedListener(mViewPager));
}*/
//giving bottom sheet a button and also onclick listener
upSlider = findViewById(R.id.up);
upSlider.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (behavior.getState() == BottomSheetBehavior.STATE_EXPANDED) {
upSlider.setImageDrawable(getResources().getDrawable(R.drawable.ic_up));
behavior.setState(BottomSheetBehavior.STATE_COLLAPSED);
} else {
upSlider.setImageDrawable(getResources().getDrawable(R.drawable.ic_down));
behavior.setState(BottomSheetBehavior.STATE_EXPANDED);
}
}
});
//bottom sheet behavior
behavior.setBottomSheetCallback(new BottomSheetBehavior.BottomSheetCallback() {
@Override
public void onStateChanged(@NonNull View bottomSheet, int newState) {
switch (newState) {
case BottomSheetBehavior.STATE_DRAGGING:
Log.i("BottomSheetCallback", "BottomSheetBehavior.STATE_DRAGGING");
break;
case BottomSheetBehavior.STATE_SETTLING:
Log.i("BottomSheetCallback", "BottomSheetBehavior.STATE_SETTLING");
break;
case BottomSheetBehavior.STATE_EXPANDED:
upSlider.setImageDrawable(getResources().getDrawable(R.drawable.ic_down));
Log.i("BottomSheetCallback", "BottomSheetBehavior.STATE_EXPANDED");
break;
case BottomSheetBehavior.STATE_COLLAPSED:
upSlider.setImageDrawable(getResources().getDrawable(R.drawable.ic_up));
Log.i("BottomSheetCallback", "BottomSheetBehavior.STATE_COLLAPSED");
break;
case BottomSheetBehavior.STATE_HIDDEN:
Log.i("BottomSheetCallback", "BottomSheetBehavior.STATE_HIDDEN");
break;
}
}
@Override
public void onSlide(@NonNull View bottomSheet, float slideOffset) {
Log.i("BottomSheetCallback", "slideOffset: " + slideOffset);
}
});
//initialising bottom Navigation bar
BottomNavigationView bottomNavigationView = findViewById(R.id.navigation);
bottomNavigationView.setOnNavigationItemSelectedListener
(new BottomNavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
new placingMarkers().execute(item.getItemId());
return true;
}
});
}
`
只有向上滑动的手势无法正常工作。