我正在尝试使用Fragment 这是我的活动课：
var body: some View {
VStack {
Spacer()
ZStack(alignment: .center) {
RoundedRectangle(cornerRadius: 10).foregroundColor(Color.white)
VStack {
Text("Add your Income").font(Fonts.mediumFont)
HStack(alignment: .center, spacing: 0) {
CustomTextField(placeHolderLabel: "Amount", val: $amount, keyboardType: UIKeyboardType.decimalPad).padding()
HStack {
Button("\(currency.rawValue)"){
self.show_currencyActionsheet = true
}
.font(Fonts.callout)
.foregroundColor(Colors.textFieldFloatingLabel)
.actionSheet(isPresented: self.$show_currencyActionsheet) {self.actionSheetCurrency}
Image(systemName: "chevron.down")
.imageScale(.small)
}.padding()
}.padding([.leading,.trailing])
Button(action: {
self.callBack()
}) {
Text(" Add Income ").font(Fonts.callout).foregroundColor(Color.white)
}
.padding()
.background(Colors.darkGreen)
.clipShape(Capsule())
}
}.frame(minHeight: 150, idealHeight: 182, maxHeight: 200)
.padding()
Spacer()
}.background(VisualEffectView(effect: UIBlurEffect(style: .dark))
.edgesIgnoringSafeArea(.all))
}
struct VisualEffectView: UIViewRepresentable {
var effect: UIVisualEffect?
func makeUIView(context: UIViewRepresentableContext<Self>) -> UIVisualEffectView { UIVisualEffectView() }
func updateUIView(_ uiView: UIVisualEffectView, context: UIViewRepresentableContext<Self>) { uiView.effect = effect }
}
ViewPagerFragmentAdapter看起来像这样：
public class InterfaceAct extends FragmentActivity implements View.OnClickListener {
private ViewPager mViewPager;
private List<Fragment> datas;
private ViewPagerFragmentAdapter viewPagerFragmentAdapter;
private LinearLayout mLLHome,mLLTimer,mLLEdit,mLLAbout;
private ImageView mImageViewHome,mImageViewTimer,mImageViewEdit,mImageViewAbout;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activiy_interface);
initDatas();// Init Data For Fragments
initView();// Init Component
initEvent();// Sign for Click Listener
viewPagerFragmentAdapter=new ViewPagerFragmentAdapter(getSupportFragmentManager(),datas);// Init Adpater Class
mViewPager.setAdapter(viewPagerFragmentAdapter);
}
private void initDatas() {
datas=new ArrayList<Fragment>();
datas.add(new MyFragment1());
datas.add(new MyFragment2());
datas.add(new MyFragment3());
datas.add(new MyFragment4());
}
private void initEvent() {
mLLHome.setOnClickListener(this);
mLLTimer.setOnClickListener(this);
mLLEdit.setOnClickListener(this);
mLLAbout.setOnClickListener(this);
mViewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {//ViewPager Scrolling Switch Listner
@Override
public void onPageSelected(int arg0) {
int currentItem=mViewPager.getCurrentItem();
resetImag();
switch (currentItem) {
case 0:
mImageViewHome.setImageResource(R.drawable.home_yes);
break;
case 1:
mImageViewTimer.setImageResource(R.drawable.timer_yes);
break;
case 2:
mImageViewEdit.setImageResource(R.drawable.edit_yes);
break;
case 3:
mImageViewAbout.setImageResource(R.drawable.about_yes);
break;
default:
break;
}
}
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
}
@Override
public void onPageScrollStateChanged(int arg0) {
}
});
}
private void initView() {
mViewPager = (ViewPager) findViewById(R.id.viewpager);
mLLHome = (LinearLayout) findViewById(R.id.ll_home);
mLLTimer = (LinearLayout) findViewById(R.id.ll_timer);
mLLEdit = (LinearLayout) findViewById(R.id.ll_edit);
mLLAbout = (LinearLayout) findViewById(R.id.ll_about);
mImageViewHome = (ImageView) findViewById(R.id.img_home);
mImageViewTimer = (ImageView) findViewById(R.id.img_timer);
mImageViewEdit = (ImageView) findViewById(R.id.img_edit);
mImageViewAbout = (ImageView) findViewById(R.id.img_about);
}
@Override
public void onClick(View v) {
resetImag();
switch (v.getId()) {
case R.id.ll_home:
mViewPager.setCurrentItem(0);
mImageViewHome.setImageResource(R.drawable.home_yes);
break;
case R.id.ll_timer:
mViewPager.setCurrentItem(1);
mImageViewTimer.setImageResource(R.drawable.timer_yes);
break;
case R.id.ll_edit:
mViewPager.setCurrentItem(2);
mImageViewEdit.setImageResource(R.drawable.edit_yes);
break;
case R.id.ll_about:
mViewPager.setCurrentItem(3);
mImageViewAbout.setImageResource(R.drawable.about_yes);
break;
default:
break;
}
}
private void resetImag() {// Reset Picture
mImageViewHome.setImageResource(R.drawable.home_no);
mImageViewTimer.setImageResource(R.drawable.timer_no);
mImageViewEdit.setImageResource(R.drawable.edit_no);
mImageViewAbout.setImageResource(R.drawable.about_no);
}
}
页面的布局，它包括一个viewpager和一个线性布局的菜单栏：
public class ViewPagerFragmentAdapter extends FragmentStatePagerAdapter {
private List<Fragment> datas;
public ViewPagerFragmentAdapter(FragmentManager fm,List<Fragment> datas) {
super(fm);
this.datas=datas;
}
@Override
public Fragment getItem(int position) {// Return View Object
return datas.get(position);
}
@Override
public int getCount() {// Return View Num
return datas.size();
}
@Override
public Object instantiateItem(ViewGroup container, int position) {// Init View
return super.instantiateItem(container, position);
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {// Destroy View
super.destroyItem(container, position, object);
}
}
这是片段之一：
?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v4.view.ViewPager
android:id="@+id/viewpager"
android:layout_width="match_parent"
android:layout_height="449dp"
android:layout_weight="1"></android.support.v4.view.ViewPager>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="70dp"
android:background="#ffffffff"
android:orientation="horizontal" >
<LinearLayout
android:id="@+id/ll_home"
android:layout_width="0dp"
android:layout_height="fill_parent"
android:layout_weight="1"
android:gravity="center"
android:orientation="vertical" >
<ImageView
android:id="@+id/img_home"
android:layout_width="40dp"
android:layout_height="40dp"
android:background="#0000"
android:src="@drawable/home_yes" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Home"
android:textColor="#b6b3b3" />
</LinearLayout>
<LinearLayout
android:id="@+id/ll_timer"
android:layout_width="0dp"
android:layout_height="fill_parent"
android:layout_weight="1"
android:gravity="center"
android:orientation="vertical" >
<ImageView
android:id="@+id/img_timer"
android:layout_width="40dp"
android:layout_height="40dp"
android:background="#0000"
android:src="@drawable/timer_no" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Timer"
android:textColor="#b6b3b3" />
</LinearLayout>
<LinearLayout
android:id="@+id/ll_edit"
android:layout_width="0dp"
android:layout_height="fill_parent"
android:layout_weight="1"
android:gravity="center"
android:orientation="vertical" >
<ImageView
android:id="@+id/img_edit"
android:layout_width="40dp"
android:layout_height="40dp"
android:background="#0000"
android:src="@drawable/edit_no" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Edit"
android:textColor="#b6b3b3" />
</LinearLayout>
<LinearLayout
android:id="@+id/ll_about"
android:layout_width="0dp"
android:layout_height="fill_parent"
android:layout_weight="1"
android:gravity="center"
android:orientation="vertical" >
<ImageView
android:id="@+id/img_about"
android:layout_width="40dp"
android:layout_height="40dp"
android:background="#0000"
android:src="@drawable/about_no" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="About"
android:textColor="#b6b3b3" />
</LinearLayout>
</LinearLayout>
</LinearLayout>
我为viewpager准备了四个片段（它们基本上是相同的，但布局不同），这是tab1布局的样子：
public class MyFragment1 extends Fragment {
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.tab1,null);
}
}
运行菜单时，我只有菜单栏，没有设置viewpager，也不知道为什么
答案 0 :(得分：0)
删除android：layout_weight =“ 1” <Viewpager>并将android:orientation="vertical"添加到线性布局
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:orientation="vertical"
android:layout_height="match_parent">
<android.support.v4.view.ViewPager
android:id="@+id/viewpager"
android:layout_width="match_parent"
android:layout_height="449dp"
></android.support.v4.view.ViewPager>
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