CODEWITHSUNDEEP
androidlistview
suraj
suraj

Reputation: 1898

ListView not getting displayed?

I have a activity which uses a listview element as follows 

public class List1 extends Activity
{

Context context=this;

@Override
        public void onCreate(Bundle savedInstanceState)
        {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.listview);

        try{
                        //DB

           final SQLiteDatabase db;
            db = openOrCreateDatabase(
                "Secret.db"
                , SQLiteDatabase.CREATE_IF_NECESSARY
                , null
                );
            db.setVersion(1);
            db.setLocale(Locale.getDefault());
            db.setLockingEnabled(true);



            Cursor cur = db.query("tbl_user",null,null,null,null,null,null);



            //DB Over


         ListView listView = (ListView) findViewById(R.id.mylist);
         listView.setTextFilterEnabled(true);



         final String[] values = new String[50];
         int i=0;
         while(cur.moveToNext())
         {

                    values[i]=Integer.toString(cur.getInt(0))+":"+cur.getString(1)+":"+cur.getString(2);     
          i++;
         }

        cur.close();

         ArrayAdapter<String> adapter = new ArrayAdapter<String>(context,R.layout.list_item,values);


            listView.setAdapter(adapter);
            listView.setVisibility(0);



               listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {

              public void onItemClick(AdapterView<?> parent, View view, int position,long id)
                //public void onItemClick(ListView<?> listview, View view, int position,long id)
                {



                  try
                  {
                     Intent i=new Intent(List1.this,Form1.class);
                     i.putExtra("uid","85");
                     startActivity(i);
                     finish();
                  }
                  catch(Exception e)
                  {
                      String insert2="insert into login values("+"\""+e.toString()+"\""+");";
                        db.execSQL(insert2);

                  }


                }
            });

               db.close();
            //required
            }
       catch(Exception e)
       {
        Toast.makeText(getApplicationContext(), e.toString(), Toast.LENGTH_LONG).show();}
       }
}

This is my listview.xml file

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >
     <ListView
        android:id="@+id/mylist"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" >
    </ListView> 

  </RelativeLayout>

This is my list_item.xml file which has the required textview

  <?xml version="1.0" encoding="utf-8"?>
    <TextView xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" 
        android:id="@+id/tv1"
        android:padding="10dp"
        android:background="@drawable/textview1"
        style="@style/textview_text"
        android:textSize="16dp">


</TextView>

But the ListView is not working. I mean after coming to this activity the app is showing error showing "APP_NAME is stopped unexpectedly". The same code works for one or two times and then shows the above error continuously after that. May I kno why is it happening?
EDIT
This is logcat file

W/dalvikvm( 2694): threadid=3: thread exiting with uncaught exception (group=0x4
001b188)
E/AndroidRuntime( 2694): Uncaught handler: thread main exiting due to uncaught e
xception
E/AndroidRuntime( 2694): java.lang.NullPointerException
E/AndroidRuntime( 2694):        at android.widget.ArrayAdapter.createViewFromRes
ource(ArrayAdapter.java:355)
E/AndroidRuntime( 2694):        at android.widget.ArrayAdapter.getView(ArrayAdap
ter.java:323)
E/AndroidRuntime( 2694):        at android.widget.AbsListView.obtainView(AbsList
View.java:1274)
E/AndroidRuntime( 2694):        at android.widget.ListView.makeAndAddView(ListVi
ew.java:1668)
E/AndroidRuntime( 2694):        at android.widget.ListView.fillDown(ListView.jav
a:637)
E/AndroidRuntime( 2694):        at android.widget.ListView.fillFromTop(ListView.
java:694)
E/AndroidRuntime( 2694):        at android.widget.ListView.layoutChildren(ListVi
ew.java:1521)
E/AndroidRuntime( 2694):        at android.widget.AbsListView.onLayout(AbsListVi
ew.java:1113)
E/AndroidRuntime( 2694):        at android.view.View.layout(View.java:6830)
E/AndroidRuntime( 2694):        at android.widget.RelativeLayout.onLayout(Relati
veLayout.java:900)
E/AndroidRuntime( 2694):        at android.view.View.layout(View.java:6830)
E/AndroidRuntime( 2694):        at android.widget.FrameLayout.onLayout(FrameLayo
ut.java:333)
E/AndroidRuntime( 2694):        at android.view.View.layout(View.java:6830)
E/AndroidRuntime( 2694):        at android.widget.LinearLayout.setChildFrame(Lin
earLayout.java:1119)
E/AndroidRuntime( 2694):        at android.widget.LinearLayout.layoutVertical(Li
nearLayout.java:998)
E/AndroidRuntime( 2694):        at android.widget.LinearLayout.onLayout(LinearLa
yout.java:918)
E/AndroidRuntime( 2694):        at android.view.View.layout(View.java:6830)
E/AndroidRuntime( 2694):        at android.widget.FrameLayout.onLayout(FrameLayo
ut.java:333)
E/AndroidRuntime( 2694):        at android.view.View.layout(View.java:6830)
E/AndroidRuntime( 2694):        at android.view.ViewRoot.performTraversals(ViewR
oot.java:996)
E/AndroidRuntime( 2694):        at android.view.ViewRoot.handleMessage(ViewRoot.
java:1633)
E/AndroidRuntime( 2694):        at android.os.Handler.dispatchMessage(Handler.ja
va:99)
E/AndroidRuntime( 2694):        at android.os.Looper.loop(Looper.java:123)
E/AndroidRuntime( 2694):        at android.app.ActivityThread.main(ActivityThrea
d.java:4363)
E/AndroidRuntime( 2694):        at java.lang.reflect.Method.invokeNative(Native
Method)
E/AndroidRuntime( 2694):        at java.lang.reflect.Method.invoke(Method.java:5
21)
E/AndroidRuntime( 2694):        at com.android.internal.os.ZygoteInit$MethodAndA
rgsCaller.run(ZygoteInit.java:860)
E/AndroidRuntime( 2694):        at com.android.internal.os.ZygoteInit.main(Zygot
eInit.java:618)
E/AndroidRuntime( 2694):        at dalvik.system.NativeStart.main(Native Method)

D/dalvikvm( 2694): GC freed 6621 objects / 343272 bytes in 126ms
I/dalvikvm( 2694): Uncaught exception thrown by finalizer (will be discarded):
I/dalvikvm( 2694): Ljava/lang/IllegalStateException;: Finalizing cursor android.
database.sqlite.SQLiteCursor@44c60cd0 on login that has not been deactivated or
closed
I/dalvikvm( 2694):      at android.database.sqlite.SQLiteCursor.finalize(SQLiteC
ursor.java:596)
I/dalvikvm( 2694):      at dalvik.system.NativeStart.run(Native Method)
I/dalvikvm( 2694): Uncaught exception thrown by finalizer (will be discarded):
I/dalvikvm( 2694): Ljava/lang/IllegalStateException;: Finalizing cursor android.
database.sqlite.SQLiteCursor@44c58028 on login that has not been deactivated or
closed
I/dalvikvm( 2694):      at android.database.sqlite.SQLiteCursor.finalize(SQLiteC
ursor.java:596)
I/dalvikvm( 2694):      at dalvik.system.NativeStart.run(Native Method)
I/dalvikvm( 2694): Uncaught exception thrown by finalizer (will be discarded):
I/dalvikvm( 2694): Ljava/lang/IllegalStateException;: Finalizing cursor android.
database.sqlite.SQLiteCursor@44c37fa0 on login that has not been deactivated or
closed
I/dalvikvm( 2694):      at android.database.sqlite.SQLiteCursor.finalize(SQLiteC
ursor.java:596)
I/dalvikvm( 2694):      at dalvik.system.NativeStart.run(Native Method)
I/Process (   52): Sending signal. PID: 2694 SIG: 3
I/dalvikvm( 2694): threadid=7: reacting to signal 3
I/dalvikvm( 2694): Wrote stack trace to '/data/anr/traces.txt'
I/Process ( 2694): Sending signal. PID: 2694 SIG: 9
I/ActivityManager(   52): Process com.notification (pid 2694) has died.
I/WindowManager(   52): WIN DEATH: Window{44d90538 com.notification/com.notifica
tion.List1 paused=false}
I/UsageStats(   52): Unexpected resume of com.android.launcher while already res
umed in com.notification
W/InputManagerService(   52): Window already focused, ignoring focus gain of: co
m.android.internal.view.IInputMethodClient$Stub$Proxy@44d933c8
I/ActivityManager(   52): Start proc com.notification for broadcast com.notifica
tion/.AlarmReceiver: pid=2706 uid=10034 gids={3003}
D/ddm-heap( 2706): Got feature list request
D/dalvikvm( 1152): GC freed 194 objects / 8728 bytes in 88ms
I/ActivityManager(   52): Starting activity: Intent { act=android.intent.action.
MAIN cat=[android.intent.category.LAUNCHER] flg=0x10200000 cmp=com.notification/
.NotificationActivity }
I/ActivityManager(   52): Starting activity: Intent { cmp=com.notification/.Back
ground }
I/ActivityManager(   52): Displayed activity com.notification/.Background: 262 m
s (total 8081 ms)
D/dalvikvm(  234): GC freed 44 objects / 2064 bytes in 134ms
D/AndroidRuntime( 2718):
D/AndroidRuntime( 2718): >>>>>>>>>>>>>> AndroidRuntime START <<<<<<<<<<<<<<
D/AndroidRuntime( 2718): CheckJNI is ON
D/AndroidRuntime( 2718): --- registering native functions ---
D/ddm-heap( 2718): Got feature list request
D/PackageParser(   52): Scanning package: /data/app/vmdl67950.tmp
I/PackageManager(   52): Removing non-system package:com.notification
D/PackageManager(   52): Removing package com.notification
D/PackageManager(   52):   Services: com.notification.BackService
D/PackageManager(   52):   Receivers: com.notification.AlarmReceiver
D/PackageManager(   52):   Activities: com.notification.NotificationActivity com
.notification.Form1 com.notification.Background com.notification.Bg com.notifica
tion.List1
W/InputManagerService(   52): Window already focused, ignoring focus gain of: co
m.android.internal.view.IInputMethodClient$Stub$Proxy@44eb1868
D/PackageManager(   52): Scanning package com.notification
I/PackageManager(   52): /data/app/vmdl67950.tmp changed; unpacking
D/installd(   32): DexInv: --- BEGIN '/data/app/vmdl67950.tmp' ---
D/dalvikvm( 2724): DexOpt: load 40ms, verify 159ms, opt 2ms
D/installd(   32): DexInv: --- END '/data/app/vmdl67950.tmp' (success) ---
D/PackageManager(   52):   Services: com.notification.BackService
D/PackageManager(   52):   Receivers: com.notification.AlarmReceiver
D/PackageManager(   52):   Activities: com.notification.NotificationActivity com
.notification.Form1 com.notification.Background com.notification.Bg com.notifica
tion.List1
D/ActivityManager(   52): Uninstalling process com.notification
D/ActivityManager(   52): Force removing process ProcessRecord{44e9eb48 2706:com
.notification/10034} (com.notification/10034)
I/Process (   52): Sending signal. PID: 2706 SIG: 9
D/ActivityManager(   52): Received spurious death notification for thread androi
d.os.BinderProxy@44eec8b8
I/installd(   32): move /data/dalvik-cache/data@[email protected]@classes.dex ->
 /data/dalvik-cache/data@[email protected]@classes.dex
D/PackageManager(   52): New package installed in /data/app/com.notification.apk

D/AndroidRuntime( 2718): Shutting down VM
D/dalvikvm( 2718): DestroyJavaVM waiting for non-daemon threads to exit
D/dalvikvm( 2718): DestroyJavaVM shutting VM down
D/dalvikvm( 2718): HeapWorker thread shutting down
D/dalvikvm( 2718): HeapWorker thread has shut down
D/jdwp    ( 2718): JDWP shutting down net...
I/dalvikvm( 2718): Debugger has detached; object registry had 1 entries
D/dalvikvm( 2718): VM cleaning up
D/dalvikvm( 2718): LinearAlloc 0x0 used 623916 of 5242880 (11%)
D/ActivityManager(   52): Uninstalling process com.notification
I/dalvikvm( 2718): JNI: AttachCurrentThread (from ???.???)
E/AndroidRuntime( 2718): ERROR: thread attach failed
W/ResourceType(   52): Resources don't contain package for resource number 0x7f0
700e5
W/ResourceType(   52): Resources don't contain package for resource number 0x7f0
20031
W/ResourceType(   52): Resources don't contain package for resource number 0x7f0
20030
W/ResourceType(   52): Resources don't contain package for resource number 0x7f0
50000
W/ResourceType(   52): Resources don't contain package for resource number 0x7f0
60000
W/ResourceType(   52): Resources don't contain package for resource number 0x7f0
60001
D/dalvikvm( 1152): GC freed 139 objects / 5928 bytes in 230ms
D/dalvikvm(   52): GC freed 14606 objects / 863536 bytes in 259ms
W/ResourceType(   52): Resources don't contain package for resource number 0x7f0
700e5
W/ResourceType(   52): Resources don't contain package for resource number 0x7f0
20031
W/ResourceType(   52): Resources don't contain package for resource number 0x7f0
20030
W/ResourceType(   52): Resources don't contain package for resource number 0x7f0
50000
D/dalvikvm(   52): GC freed 425 objects / 17320 bytes in 275ms
W/ResourceType(   52): Resources don't contain package for resource number 0x7f0
60000
W/ResourceType(   52): Resources don't contain package for resource number 0x7f0
60001
D/AndroidRuntime( 2729):
D/AndroidRuntime( 2729): >>>>>>>>>>>>>> AndroidRuntime START <<<<<<<<<<<<<<
D/AndroidRuntime( 2729): CheckJNI is ON
D/AndroidRuntime( 2729): --- registering native functions ---
D/ddm-heap( 2729): Got feature list request
I/ActivityManager(   52): Starting activity: Intent { act=android.intent.action.
MAIN cat=[android.intent.category.LAUNCHER] flg=0x10000000 cmp=com.notification/
.NotificationActivity }
I/ActivityManager(   52): Start proc com.notification for activity com.notificat
ion/.NotificationActivity: pid=2735 uid=10034 gids={3003}
D/AndroidRuntime( 2729): Shutting down VM
D/dalvikvm( 2729): DestroyJavaVM waiting for non-daemon threads to exit
D/dalvikvm( 2729): DestroyJavaVM shutting VM down
D/dalvikvm( 2729): HeapWorker thread shutting down
D/dalvikvm( 2729): HeapWorker thread has shut down
D/jdwp    ( 2729): JDWP shutting down net...
I/dalvikvm( 2729): Debugger has detached; object registry had 1 entries
D/dalvikvm( 2729): VM cleaning up
E/AndroidRuntime( 2729): ERROR: thread attach failed
D/dalvikvm( 2729): LinearAlloc 0x0 used 639500 of 5242880 (12%)
D/dalvikvm(   30): GC freed 299 objects / 11576 bytes in 264ms
D/ddm-heap( 2735): Got feature list request
D/dalvikvm(   30): GC freed 57 objects / 2432 bytes in 160ms
D/dalvikvm(   30): GC freed 2 objects / 48 bytes in 360ms
I/ActivityManager(   52): Displayed activity com.notification/.NotificationActiv
ity: 1204 ms (total 1204 ms)
W/KeyCharacterMap( 2735): No keyboard for id 0
W/KeyCharacterMap( 2735): Using default keymap: /system/usr/keychars/qwerty.kcm.
bin
I/ActivityManager(   52): Starting activity: Intent { cmp=com.notification/.Bg (
has extras) }
I/ActivityManager(   52): Displayed activity com.notification/.Bg: 329 ms (total
 329 ms)
D/dalvikvm( 1152): GC freed 2454 objects / 141000 bytes in 600ms
I/ActivityManager(   52): Starting activity: Intent { cmp=com.notification/.List
1 bnds=[0,152][480,248] }
W/ActivityManager(   52): startActivity called from non-Activity context; forcin
g Intent.FLAG_ACTIVITY_NEW_TASK for: Intent { cmp=com.notification/.List1 bnds=[
0,152][480,248] }
D/AndroidRuntime( 2735): Shutting down VM
W/dalvikvm( 2735): threadid=3: thread exiting with uncaught exception (group=0x4
001b188)
E/AndroidRuntime( 2735): Uncaught handler: thread main exiting due to uncaught e
xception
E/AndroidRuntime( 2735): java.lang.NullPointerException
E/AndroidRuntime( 2735):        at android.widget.ArrayAdapter.createViewFromRes
ource(ArrayAdapter.java:355)
E/AndroidRuntime( 2735):        at android.widget.ArrayAdapter.getView(ArrayAdap
ter.java:323)
E/AndroidRuntime( 2735):        at android.widget.AbsListView.obtainView(AbsList
View.java:1256)
E/AndroidRuntime( 2735):        at android.widget.ListView.measureHeightOfChildr
en(ListView.java:1147)
E/AndroidRuntime( 2735):        at android.widget.ListView.onMeasure(ListView.ja
va:1060)
E/AndroidRuntime( 2735):        at android.view.View.measure(View.java:7964)
E/AndroidRuntime( 2735):        at android.widget.RelativeLayout.measureChild(Re
lativeLayout.java:554)
E/AndroidRuntime( 2735):        at android.widget.RelativeLayout.onMeasure(Relat
iveLayout.java:377)
E/AndroidRuntime( 2735):        at android.view.View.measure(View.java:7964)
E/AndroidRuntime( 2735):        at android.view.ViewGroup.measureChildWithMargin
s(ViewGroup.java:3023)
E/AndroidRuntime( 2735):        at android.widget.FrameLayout.onMeasure(FrameLay
out.java:245)
E/AndroidRuntime( 2735):        at android.view.View.measure(View.java:7964)
E/AndroidRuntime( 2735):        at android.widget.LinearLayout.measureVertical(L
inearLayout.java:464)
E/AndroidRuntime( 2735):        at android.widget.LinearLayout.onMeasure(LinearL
ayout.java:278)
E/AndroidRuntime( 2735):        at android.view.View.measure(View.java:7964)
E/AndroidRuntime( 2735):        at android.view.ViewGroup.measureChildWithMargin
s(ViewGroup.java:3023)
E/AndroidRuntime( 2735):        at android.widget.FrameLayout.onMeasure(FrameLay
out.java:245)
E/AndroidRuntime( 2735):        at android.view.View.measure(View.java:7964)
E/AndroidRuntime( 2735):        at android.view.ViewRoot.performTraversals(ViewR
oot.java:763)
E/AndroidRuntime( 2735):        at android.view.ViewRoot.handleMessage(ViewRoot.
java:1633)
E/AndroidRuntime( 2735):        at android.os.Handler.dispatchMessage(Handler.ja
va:99)
E/AndroidRuntime( 2735):        at android.os.Looper.loop(Looper.java:123)
E/AndroidRuntime( 2735):        at android.app.ActivityThread.main(ActivityThrea
d.java:4363)
E/AndroidRuntime( 2735):        at java.lang.reflect.Method.invokeNative(Native
Method)
E/AndroidRuntime( 2735):        at java.lang.reflect.Method.invoke(Method.java:5
21)
E/AndroidRuntime( 2735):        at com.android.internal.os.ZygoteInit$MethodAndA
rgsCaller.run(ZygoteInit.java:860)
E/AndroidRuntime( 2735):        at com.android.internal.os.ZygoteInit.main(Zygot
eInit.java:618)
E/AndroidRuntime( 2735):        at dalvik.system.NativeStart.main(Native Method)

I/Process (   52): Sending signal. PID: 2735 SIG: 3
I/dalvikvm( 2735): threadid=7: reacting to signal 3
I/dalvikvm( 2735): Wrote stack trace to '/data/anr/traces.txt'
W/ActivityManager(   52): Launch timeout has expired, giving up wake lock!
W/ActivityManager(   52): Activity idle timeout for HistoryRecord{44dcace0 com.n
otification/.List1}
I/Process ( 2735): Sending signal. PID: 2735 SIG: 9
I/ActivityManager(   52): Process com.notification (pid 2735) has died.
I/WindowManager(   52): WIN DEATH: Window{44d8db78 com.notification/com.notifica
tion.List1 paused=false}
I/UsageStats(   52): Unexpected resume of com.android.launcher while already res
umed in com.notification
I/ActivityManager(   52): Start proc com.notification for broadcast com.notifica
tion/.AlarmReceiver: pid=2745 uid=10034 gids={3003}
W/InputManagerService(   52): Window already focused, ignoring focus gain of: co
m.android.internal.view.IInputMethodClient$Stub$Proxy@44f2e3d8
E/gralloc (   52): [unregister] handle 0x423290 still locked (state=40000001)
D/ddm-heap( 2745): Got feature list request
D/dalvikvm( 1152): GC freed 212 objects / 9560 bytes in 82ms
I/ActivityManager(   52): Starting activity: Intent { act=android.intent.action.
MAIN cat=[android.intent.category.LAUNCHER] flg=0x10200000 cmp=com.notification/
.NotificationActivity }
I/ActivityManager(   52): Starting activity: Intent { cmp=com.notification/.Back
ground }
I/ActivityManager(   52): Displayed activity com.notification/.Background: 240 m
s (total 16387 ms)
D/dalvikvm(  234): GC freed 43 objects / 2024 bytes in 152ms

Upvotes: 0

Views: 454

Answers (3)

MLoydd
MLoydd

Reputation: 56

i think your adapter should know which textViewResourceId it should use. So try this out: ArrayAdapter<String> adapter = new ArrayAdapter<String>(context,R.layout.list_item, R.id.tv1,values);

Upvotes: 2

Blackbelt
Blackbelt

Reputation: 157487

     final String[] values = new String[50];
     int i=0;
     while(cur.moveToNext())
     {

                values[i]=Integer.toString(cur.getInt(0))+":"+cur.getString(1)+":"+cur.getString(2);     
      i++;
     }

    cur.close();

Starting from the this spinet of code.

When the db.query returns you should rewind the cursor before starting to use it in the while loop. What if the query returns more the 50 results? Your app will crash with ArrayOutBoundException

Upvotes: 1

Ragunath Jawahar
Ragunath Jawahar

Reputation: 19743

Change this to

<ListView
    android:id="@+id/mylist"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" >

this

<ListView
    android:id="@+id/mylist"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

And why do you need listView.setVisibility(0)?

Upvotes: 1

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