我正在尝试为我的家乡制作一个基本的旅游应用程序。我在listView上设置了onItemClickListener。我的目标是，当单击列表项时，我想打开一个新活动，向用户显示有关所选项目的更多信息（地址，电话号码，GPS位置等）。在发送intent之前，我在片段中设置了所有textview，因此，当我setContentView时，它应该显示已经填充的所有准确信息。
问题是，单击列表视图时，活动会启动空白活动。没有错误消息，logCat显示文本视图已正确更新，但它们无法正确显示布局。
我已经在这方面工作了好几天，并且感谢任何人都能给予的任何帮助。提前致谢。代码如下。
**这是包含要显示的信息的arrayList的片段。
public class FoodFragment extends Fragment {
public FoodFragment() {
// Required empty public constructor
}
public TourSite currentSite;
@Override
public View onCreateView(final LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.sites_listview, container, false);
// Create an ArrayList of TourSite objects for main tab lists
final ArrayList<TourSite> tourSites = new ArrayList<TourSite>();
tourSites.add(new TourSite(R.string.ginasAddress, R.string.ginasNumber, R.string.ginasGPS,
R.string.ginasWeblink, R.drawable.pizza_100, R.string.ginasName));
tourSites.add(new TourSite(R.string.ninosAddress, R.string.ninosnumber, R.string.ninosGPS,
R.string.ninosWeblink, R.drawable.pizza_100, R.string.ninosName));
tourSites.add(new TourSite(R.string.topsAddress, R.string.topsDinerNumber,
R.string.topsDinerGPS, R.string.topsWeblink, R.drawable.restaurant_100,
R.string.topsName));
tourSites.add(new TourSite(R.string.goldenEagleAddress, R.string.goldenEagleNumber,
R.string.goldenEagleGPS, R.drawable.noodles_100, R.string.goldenEagleName));
//Creates adapter that displays tourSites on tabs
TourSiteListAdapter adapter = new TourSiteListAdapter(getActivity(), tourSites);
//finds the listview that were using to display the images and names
ListView listview = (ListView) rootView.findViewById(R.id.siteList);
listview.setAdapter(adapter);
//attaches Listener to listView in order to open new activity with further
// information about the toursite
listview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
//finds the selected list item
currentSite = tourSites.get(position);
//inflates the layout we want to display using the intent below
LayoutInflater inflater1 = (LayoutInflater) getContext().getSystemService
(Context.LAYOUT_INFLATER_SERVICE);
View root = inflater1.inflate(R.layout.list_item_info, null, true);
//finds the textViews in the layout that we want to update before
// displaying in activity
TextView addressView = (TextView) root.findViewById(R.id.addressView);
TextView numberView = (TextView) root.findViewById((R.id.numberView));
TextView gpsView = (TextView) root.findViewById(R.id.gpsView);
TextView weblinkView = (TextView) root.findViewById(R.id.weblinkView);
//some toursites dont have phone numbers or websites. This handles that
// while also updateding the content to be displayed
if (currentSite.hasAddress()) {
addressView.setText(currentSite.getmAddress());
addressView.setVisibility(View.VISIBLE);
} else {
addressView.setVisibility(View.GONE);
}
if (currentSite.hasPhone()) {
numberView.setText(currentSite.getmPhone());
numberView.setVisibility(View.VISIBLE);
} else {
numberView.setVisibility(View.GONE);
}
gpsView.setText(currentSite.getmGPSlink());
gpsView.setMovementMethod(LinkMovementMethod.getInstance());
if (currentSite.hasWeblink()) {
weblinkView.setText(currentSite.getmWeblink());
weblinkView.setVisibility(View.VISIBLE);
weblinkView.setMovementMethod(LinkMovementMethod.getInstance());
} else {
weblinkView.setVisibility(View.GONE);
}
//used these logs to make sure the textviews were being updated correctly
Log.d("addressView = ", addressView.getText().toString());
Log.d("numberView = ", numberView.getText().toString());
Log.d("gpsView = ", "" + gpsView.getText().toString());
Log.d("weblinkView = ", weblinkView.getText().toString());
//starts new activity that displays tourSite info
Intent showInfo = new Intent(getContext(), TourSiteInfo.class);
startActivity(showInfo);
}
});
return rootView;
}
}
**这是应该显示布局的活动，但是空白
public class TourSiteInfo extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.list_item_info);
}
}
**这是应该显示的XML布局
<LinearLayout
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:orientation="vertical"
android:padding="24dp"
android:id="@+id/infoLayout">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
tools:text="123 Main Ave, Newark, New Jersey"
android:id="@+id/addressView"
android:padding="16dp"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
tools:text="123 Main Ave, Newark, New Jersey"
android:id="@+id/numberView"
android:padding="16dp"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
tools:text="123 Main Ave, Newark, New Jersey"
android:id="@+id/gpsView"
android:padding="16dp"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
tools:text="123 Main Ave, Newark, New Jersey"
android:id="@+id/weblinkView"
android:padding="16dp"/>
</LinearLayout>
***这是包含viewPager和tabLayout
的mainActivity javapublic class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ViewPager viewpager = (ViewPager) findViewById(R.id.viewpager);
CategoryAdapter adapter = new CategoryAdapter(this, getSupportFragmentManager());
viewpager.setAdapter(adapter);
TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewpager);
}
}
** mainAcivity XML
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:id="@+id/mainLayout">
<android.support.design.widget.TabLayout
android:id="@+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<android.support.v4.view.ViewPager
android:id="@+id/viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</LinearLayout>
***当应用程序启动并单击列表项时，LogCat
01/25 14:37:31: Launching app
D/ViewRootImpl: ViewPostImeInputStage processPointer 0
D/ViewRootImpl: ViewPostImeInputStage processPointer 1
D/addressView =: 503 Frank E Rodgers Blvd N, Harrison, NJ 07029
D/numberView =: (973) 482-4883
D/gpsView =: (correct google link displays but stack overflow won't allow it)
D/weblinkView =: ginaspizzanj.com
I/Timeline: Timeline:Activity_launch_requestid
:com.example.android.tourguide
time:222869939
D/SecWifiDisplayUtil: Metadata value : none
D/ViewRootImpl: #1 mView =
com.android.internal.policy.
PhoneWindow$DecorView{d9020d4 I.E...... R.....ID 0,0-0,0}
D/ViewRootImpl: MSG_RESIZED_REPORT:
ci=Rect(0, 96 - 0, 0) vi=Rect(0, 96 - 0, 0) or=1
W/DisplayListCanvas: DisplayListCanvas is started on unbinded
RenderNode (without mOwningView)
I/Timeline: Timeline: Activity_idle id:
android.os.BinderProxy@5ab3627 time:222870123
V/ActivityThread: updateVisibility : ActivityRecord{5e11572
token=android.os.BinderProxy@3d0da23
{com.example.android.tourguide/com.example.android.tourguide.MainActivity}} show : true
我几天来一直在研究和尝试不同的解决方案，但还没有任何工作。
答案 0 :(得分：0)
所以，我认为你需要在TourSiteInfo类中进行UI初始化。在onItemClick中充气和设置值并不合理。它只会创建一个新视图，并且会在创建后很快GC创建，在那里创建的视图与TourSiteInfo活动没有任何关系。
所以这就是你需要做的。
Intent showInfo = new Intent(getContext(), TourSiteInfo.class);。在此之后，您需要将所有站点信息设置为此意图作为额外值。您可以参考this。
从TourSiteInfo.onCreate中的意图中提取信息，并将值设置为控件。代码与您在onItemClick中的代码完全相同。