从Fragment意图启动活动将启动空白活动 [英] Starting Activity by intent from Fragment starts blank Activity

问题描述

我找不到我的问题的答案，所以我提出了一个新问题.

I could not find an answer to my problem, so I make a new Question.

我的MainActivity中有一个带有TabLayout(+ ViewPagerAdapter)的Android应用，每个选项卡都是一个Fragment.现在，我想从我的片段开始一个带有意图的新活动.一次，我想在按FAB时打开一个活动，而另一次想在按新闻源中的FeedItem时打开另一个活动.现在，每当我按一些东西时，它就会打开一个完全空白的页面.

I have an Android app with a TabLayout (+ ViewPagerAdapter) in my MainActivity and every Tab is a Fragment. Now I want to start a new Activity with Intent from my Fragment. Once I want to open an Activity when pressing a FAB, and another time I want to open another Activity when pressing a FeedItem from my Newsfeed. Now everytime i press something, it opens a completely blank Page.

我在两个Activity的onCreate()上的setContentView上都放在了正确的Layout上，当我直接在Tab中显示它们时，两个Activity(+ layout)都可以正常工作.

I do the setContentView in both Activities' onCreate() onto the right Layout, and both Activities (+layout) are working fine on their own when i display them directly in a Tab.

我将要调用的两个活动和片段放在下面，如果您需要其他任何内容，请告诉我.

I will put the two Activities I want to call and the Fragment from where I call below, if you need anything else please let me know.

如果有人能帮助我，我将感到非常高兴，我在我的最后一个学校项目中需要它:)

I would be really glad if someone could help me, I need this for my final school project :)

NewsFragment(我的新闻提要和FAB所在的位置):

NewsFragment (where my Newsfeed and FAB is):

public class NewsFragment extends ListFragment 
           implements NumberPicker.OnValueChangeListener{

@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {

    ViewGroup v = (ViewGroup)inflater.inflate(R.layout.fragment_news,container,false);

    ... 

    Context con = v.getContext();

    //FAB
    FloatingActionButton fab = (FloatingActionButton) v.findViewById(R.id.fab);
    fab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            // Click action
            Intent intent = new Intent(con, OfferActivity.class);
            getActivity().startActivity(intent);
        }
    });
}

//Here I watch the Newsfeed Click
@Override
public void onListItemClick(ListView l, View v, int position, long id) {
    super.onListItemClick(l, v, position, id);

    FeedItem item = (FeedItem) adapter.getItem(position);

    Intent intent = new Intent(getActivity(), BookActivity.class);
    intent.putExtra("item", item);
    intent.putExtra("rideid", rideidArray.get(position));
    intent.putExtra("seats", seatsArray.get(position));
    startActivity(intent);
}
}

这是FAB所说的活动:

This is the Activity I call by the FAB:

public class OfferActivity extends AppCompatActivity {

@Override
public void onCreate(Bundle savedInstanceState, PersistableBundle persistentState) {
        super.onCreate(savedInstanceState, persistentState);
    setContentView(R.layout.activity_offer);
    ...
}

然后我通过单击ListView项来调用活动":

And the Activity I call by clicking a ListView item:

public class DetailsActivity extends AppCompatActivity implements NumberPicker.OnValueChangeListener{

@Override
public void onCreate(Bundle savedInstanceState, PersistableBundle persistentState) {
    super.onCreate(savedInstanceState, persistentState);
    setContentView(R.layout.dialog_ride_details);
    ...
}

这是当我按下FAB时进入Android监视器的内容.我发出了此Log调用:

Here is what i get in the Android Monitor when i press the FAB. I made this Log call:

Log.d("onClick: ", getActivity().toString()+ " "+OfferActivity.class.toString());

得到这个

D/onClick:: at.friendlyride.friendlyride.main.MainActivity@bc040c9 class at.friendlyride.friendlyride.main.OfferActivity  
D/OpenGLRenderer: endAllStagingAnimators on 0x7f978af000 (RippleDrawable) with handle 0x7f98e11d40

这是MainActivity xml文件，其中有TabLayout:

And here is the MainActivity xml file, where I have the TabLayout:

<android.support.design.widget.CoordinatorLayout 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"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
tools:context=".MainActivity">

<!--<include-->
    <!--android:id="@+id/tool_bar"-->
    <!--layout="@layout/tool_bar"-->
    <!--/>-->

<android.support.design.widget.AppBarLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:background="?attr/colorPrimary"
        app:layout_scrollFlags="scroll|enterAlways"
        app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />

    <android.support.design.widget.TabLayout
        android:id="@+id/tabs"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:tabMode="fixed"
        app:tabGravity="fill"
        app:tabIndicatorColor="@color/white"/>
</android.support.design.widget.AppBarLayout>

<android.support.v4.view.ViewPager
    android:id="@+id/viewpager"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"  />

推荐答案

替换:

 @Override 
public void onCreate(Bundle savedInstanceState, PersistableBundle persistentState) {
    super.onCreate(savedInstanceState, persistentState);
    setContentView(R.layout.dialog_ride_details);
    ... 
} 

使用:

 @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.dialog_ride_details);
        ....
}

在您的DetailsActivity类中

in your DetailsActivity class

refer http://developer.android.com/reference/android/app/Activity.html

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