[英]Getting black screen when switching to an activity
如標題所示,嘗試切換到新活動時,我得到了黑屏。 奇怪的是,我能夠毫無問題地切換到另一個(幾乎相同的活動)。 (它正在模擬器上運行。)
我最好的假設是新活動的onCreate()
方法中有某些內容(但其他活動的onCreate
方法或多或少都相同,並且可以正常工作),或者由於某種原因,它試圖一次又一次地運行新活動而未成功內存不足,但我不知道是什么原因。
這是切換到新活動的代碼,第一個嵌套的if語句毫無問題地轉到新活動,第二個則顯示黑屏:
menu.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
@Override
public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {
//check which menu item was pressed
String group = (String)((PBMMenuItem)parent.getExpandableListAdapter().getGroup(groupPosition)).name;
String child = (String)parent.getExpandableListAdapter().getChild(groupPosition, childPosition);
String addSession = getString(R.string.addsession);
//set up intent
Intent intent;
if(group.equals(getString(R.string.cashgames))) {
if(child.equals(getString(R.string.addsession)))
{
intent = new Intent(v.getContext(), AddCashGame.class);
startActivity(intent);
}
else if (child.equals(getString(R.string.viewsessions)))
{
intent = new Intent(v.getContext(), ViewSessions.class);
startActivity(intent);
}
}
//else if(group.equals(getString(R.string.tournaments)))
//{
//
//}
return true;
}
});
這是無法正常啟動的活動的類代碼:
public class ViewSessions extends ActionBarActivity
implements NavigationDrawerFragment.NavigationDrawerCallbacks {
/**Fragment managing the behaviors, interactions and presentation of the navigation drawer.*/
private NavigationDrawerFragment mNavigationDrawerFragment;
/**Used to store the last screen title. For use in {@link #restoreActionBar()}.*/
private CharSequence mTitle;
private final Context C = this;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_view_sessions);
mNavigationDrawerFragment = (NavigationDrawerFragment) getSupportFragmentManager().findFragmentById(R.id.navigation_drawer);
mTitle = getTitle();
// Set up the drawer.
mNavigationDrawerFragment.setUp(R.id.navigation_drawer, (DrawerLayout) findViewById(R.id.drawer_layout));
}
public void openNavDrawer(View view)
{
mNavigationDrawerFragment.getDrawerLayout().openDrawer(Gravity.LEFT);
}
@Override
public void onNavigationDrawerItemSelected(int position) {
// update the main content by replacing fragments
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction()
.replace(R.id.container, PlaceholderFragment.newInstance(position + 1))
.commit();
}
public void onSectionAttached(int number) {
}
public void restoreActionBar() {
ActionBar actionBar = getSupportActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
actionBar.setDisplayShowTitleEnabled(true);
actionBar.setTitle(mTitle);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
if (!mNavigationDrawerFragment.isDrawerOpen()) {
// Only show items in the action bar relevant to this screen
// if the drawer is not showing. Otherwise, let the drawer
// decide what to show in the action bar.
getMenuInflater().inflate(R.menu.view_sessions, menu);
restoreActionBar();
return true;
}
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
/**
* The fragment argument representing the section number for this
* fragment.
*/
private static final String ARG_SECTION_NUMBER = "section_number";
/**
* Returns a new instance of this fragment for the given section
* number.
*/
public static PlaceholderFragment newInstance(int sectionNumber) {
PlaceholderFragment fragment = new PlaceholderFragment();
Bundle args = new Bundle();
args.putInt(ARG_SECTION_NUMBER, sectionNumber);
fragment.setArguments(args);
return fragment;
}
public PlaceholderFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_view_sessions, container, false);
return rootView;
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
((ViewSessions) activity).onSectionAttached(
getArguments().getInt(ARG_SECTION_NUMBER));
}
}
}
這是活動的XML:
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="pokerbankrollmanager.com.pokerbankrollmanager.ViewSessions">
<FrameLayout android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<RelativeLayout
style="@style/pokertable_main"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="match_parent"
android:layout_gravity="center_vertical|right">
</RelativeLayout>
<LinearLayout
style="@style/pokertable_menu"
android:orientation="horizontal"
android:layout_width="10dp"
android:layout_height="match_parent"
android:layout_gravity="left|center_vertical"
android:weightSum="1">
<ImageButton
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/imageButton"
android:layout_gravity="center_vertical"
android:src="@drawable/right_facing_arrow_icon"
android:onClick="openNavDrawer"
android:background="@android:color/transparent" />
</LinearLayout>
</FrameLayout>
<!-- android:layout_gravity="start" tells DrawerLayout to treat
this as a sliding drawer on the left side for left-to-right
languages and on the right side for right-to-left languages.
If you're not building against API 17 or higher, use
android:layout_gravity="left" instead. -->
<!-- The drawer is given a fixed width in dp and extends the full height of
the container. -->
<fragment android:id="@+id/navigation_drawer"
android:layout_width="@dimen/navigation_drawer_width" android:layout_height="match_parent"
android:layout_gravity="start"
android:name="pokerbankrollmanager.com.pokerbankrollmanager.NavigationDrawerFragment"
tools:layout="@layout/fragment_navigation_drawer" />
當我單擊以切換到新活動並出現黑屏時,我的Logcat會瘋狂地打印如下消息:
07/15/21:07:27.092 1511-1522 / pbm.com.pbm I / art:背景部分並發標記清除GC已釋放14484(873KB)AllocSpace對象,61(1464KB)LOS對象,5%的可用空間,33MB / 35MB,暫停1.617ms共109.674ms
07-15 21:07:27.614 1511-1522 / pbm.com.pbm W / art:掛起所有線程:7.923毫秒
07-15 21:07:27.644 1511-1522 / pbm.com.pbm I / art:背景部分並發標記清除GC已釋放8838(541KB)AllocSpace對象,41(984KB)LOS對象,5%已釋放,34MB / 36MB,暫停11.304ms共76.280ms
07-15 21:07:31.270 1511-1518 / pbm.com.pbm W / art:暫停所有線程所花時間:9.136ms
07-15 21:07:31.782 1511-1518 / pbm.com.pbm W / art:暫停所有線程花費:20.296ms
您好yitzih,我認為您的XML文件中的錯誤行在此行中給出了錯誤的上下文
tools:context="pokerbankrollmanager.com.pokerbankrollmanager.AddCashGame">
這應該是
tools:context="pokerbankrollmanager.com.pokerbankrollmanager.ViewSessions">`
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