android - listview data from database by using hashmap does not working -

-

this question has answer here:

i tried android project listview.i added values in db using hashmap , display result in listview. couldn't started correctly..pls me solve this...

here java code

package com.example.subitemlistviewdb;  import java.util.arraylist; import java.util.hashmap;  import android.r; import android.os.bundle; import android.app.activity; import android.app.listactivity; import android.view.menu; import android.widget.listadapter; import android.widget.listview; import android.widget.simpleadapter;  public class mainactivity extends listactivity {     dbcontroller dbc=new dbcontroller(this);     listview l;      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_list_item);         l=(listview) findviewbyid(r.id.list);         arraylist<hashmap<string, string>> countrylist=dbc.getinfo();         if(countrylist.size()!=0)         {             l=getlistview();             listadapter adapter=new simpleadapter(mainactivity.this, countrylist, r.layout.list_content, new string [] {"id","cname","capital"}, new int [] {r.id.title,r.id.text1,r.id.text2});             setlistadapter(adapter);         }     }   }

i added data using insert query. want display result in listview. here db class

package com.example.subitemlistviewdb;  import java.util.arraylist; import java.util.hashmap;  import android.content.context; import android.database.cursor; import android.database.sqlite.sqlitedatabase; import android.database.sqlite.sqliteopenhelper; import android.util.log;  public class dbcontroller extends sqliteopenhelper {     private static final string logcat="null";     public dbcontroller(context con)     {         super(con,"sqlite.db",null,1);         log.d(logcat, "created");     }     @override     public void oncreate(sqlitedatabase db)     {          db.execsql("create table country (id integer primary key autoincrement, cname text, capital text)");         db.execsql("insert country (id,'cname','capital') values (1,'india', delhi)");         db.execsql("insert country (id,'cname','capital') values (2,'china', beijing)");         db.execsql("insert country (id,'cname','capital') values (3,'england', london)");         db.execsql("insert country (id,'cname','capital') values (4,'usa', washington)");         db.execsql("insert country (id,'cname','capital') values (5,'sri lanka', columbo)");         db.execsql("insert country (id,'cname','capital') values (6,'afghanisthan', kaabul)");     }     public void onupgrade(sqlitedatabase db,int version_old,int version_new){         db.execsql("drop table exists country");         oncreate(db);     }     public arraylist<hashmap<string, string>> getinfo(){         arraylist<hashmap<string, string>> clist;         clist=new arraylist<hashmap<string,string>>();         string query="select * country";         sqlitedatabase db=this.getwritabledatabase();         cursor c=db.rawquery(query,null);         if(c.movetofirst())         {                         {                 hashmap<string, string> map=new hashmap<string, string>();                 map.put("id", c.getstring(0));                 map.put("cname", c.getstring(1));                 map.put("capital", c.getstring(2));                 clist.add(map);             }while(c.movetonext());         }         return clist;      }  }

i couldn't find error come from.so

now updated logcat output:

08-26 11:30:34.351: e/androidruntime(2138): fatal exception: main 08-26 11:30:34.351: e/androidruntime(2138): java.lang.runtimeexception: unable start activity componentinfo{com.example.subitemlistviewdb/com.example.subitemlistviewdb.mainactivity}: java.lang.runtimeexception: content must have listview id attribute 'android.r.id.list' 08-26 11:30:34.351: e/androidruntime(2138):     @ android.app.activitythread.performlaunchactivity(activitythread.java:2180) 08-26 11:30:34.351: e/androidruntime(2138):     @ android.app.activitythread.handlelaunchactivity(activitythread.java:2230) 08-26 11:30:34.351: e/androidruntime(2138):     @ android.app.activitythread.access$600(activitythread.java:141) 08-26 11:30:34.351: e/androidruntime(2138):     @ android.app.activitythread$h.handlemessage(activitythread.java:1234) 08-26 11:30:34.351: e/androidruntime(2138):     @ android.os.handler.dispatchmessage(handler.java:99) 08-26 11:30:34.351: e/androidruntime(2138):     @ android.os.looper.loop(looper.java:137) 08-26 11:30:34.351: e/androidruntime(2138):     @ android.app.activitythread.main(activitythread.java:5041) 08-26 11:30:34.351: e/androidruntime(2138):     @ java.lang.reflect.method.invokenative(native method) 08-26 11:30:34.351: e/androidruntime(2138):     @ java.lang.reflect.method.invoke(method.java:511) 08-26 11:30:34.351: e/androidruntime(2138):     @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:793) 08-26 11:30:34.351: e/androidruntime(2138):     @ com.android.internal.os.zygoteinit.main(zygoteinit.java:560) 08-26 11:30:34.351: e/androidruntime(2138):     @ dalvik.system.nativestart.main(native method) 08-26 11:30:34.351: e/androidruntime(2138): caused by: java.lang.runtimeexception: content must have listview id attribute 'android.r.id.list' 08-26 11:30:34.351: e/androidruntime(2138):     @ android.app.listactivity.oncontentchanged(listactivity.java:243) 08-26 11:30:34.351: e/androidruntime(2138):     @ com.android.internal.policy.impl.phonewindow.setcontentview(phonewindow.java:273) 08-26 11:30:34.351: e/androidruntime(2138):     @ android.app.activity.setcontentview(activity.java:1881) 08-26 11:30:34.351: e/androidruntime(2138):     @ com.example.subitemlistviewdb.mainactivity.oncreate(mainactivity.java:22) 08-26 11:30:34.351: e/androidruntime(2138):     @ android.app.activity.performcreate(activity.java:5104) 08-26 11:30:34.351: e/androidruntime(2138):     @ android.app.instrumentation.callactivityoncreate(instrumentation.java:1080) 08-26 11:30:34.351: e/androidruntime(2138):     @ android.app.activitythread.performlaunchactivity(activitythread.java:2144) 08-26 11:30:34.351: e/androidruntime(2138):     ... 11 more 08-26 11:35:34.872: i/process(2138): sending signal. pid: 2138 sig: 9 08-26 11:40:04.811: e/trace(2219): error opening trace file: no such file or directory (2) 08-26 11:40:05.691: d/null(2219): created 08-26 11:40:06.791: d/androidruntime(2219): shutting down vm 08-26 11:40:06.791: w/dalvikvm(2219): threadid=1: thread exiting uncaught exception (group=0x40a71930)

here xml file

<relativelayout 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"  > <listview      android:id="@android:id/list"     android:layout_width="fill_parent"     android:layout_height="wrap_content">  </listview> </relativelayout>

i use eclipse ide

quoting docs

listactivity has default layout consists of single, full-screen list in center of screen. however, if desire, can customize screen layout setting own view layout setcontentview() in oncreate(). this, own view must contain listview object id "@android:id/list" (or list if it's in code).

so make sure have below listview in xml

  <listview android:id="@android:id/list"

Comments

Post a Comment

Popular posts from this blog

java - activate/deactivate sonar maven plugin by profile? -

-
i use sonar plugin executes if activated in maven profile. sonar runs on every compile. the problem build fail other team members not have sonar application installed locally. pom.xml checked in team members same copy including sonar configuration, don't want them modify purpose of disabling sonar (they might inadvertently check modified copy in). please advise how configure maven (.m2/settings.xml) and/or pom.xml sonar feature can enabled/disabled local profile. here sonar configuration in each project's pom.xml: <plugin> <groupid>org.codehaus.mojo</groupid> <artifactid>sonar-maven-plugin</artifactid> <version>1.0</version> <executions> <execution> <id>make-sonar</id> <phase>compile</phase> <goals> <goal>sonar</goal> </goals> </execution> </executions> ...
Read more

python - TypeError: can only concatenate tuple (not "float") to tuple -

-
i'm new python, question might easy, anyway, patience: as trying call newton-raphson method calculate implied volatility in black-scholes formula call/put option pricing, first thing is, newton method in scipy.optimize seems calculate function's zeros, in black-scholes formula, want function's value option price, not zero. (i'm new here programming, i'm not sure techniques.) should write function things like: def f(sigma, price): return bsformula(s0,k,r,t,q,sigma) - price then, while calling newton method, takes args=() 1 parameter in function, write this: value = newton(bsprice2, 0.5, args=price) but error message: file "bs.py", line 36, in bsimpvol value = newton(bsprice2, 0.5, args=float(price)) file "/usr/lib/python2.7/dist-packages/scipy/optimize/zeros.py", line 143, in newton q0 = func(*((p0,) + args)) typeerror: can concatenate tuple (not "float") tuple could tell me why that? how fix it? apprecia...
Read more

java - What is the difference between String. and String.this. ? -

-
this question has answer here: meaning of .this , .class in java 2 answers i'll straight point. im still learning bit of syntax , want know difference between code is code a: public class buttonz extends jbutton{ public buttonz(){ settext(new string(string.valueof(i))); } } please ignore fact i undeclared, not lost. code b: public class buttonz extends jbutton{ public buttonz(){ settext(new string(string.this.charat(i))); } } what don't yet understand difference in typing string.this , string. i under assumption when use dot operator on class accessing it's static methods(and/or variables if they're not hidden). i have studied little bit , have concluded when using string. accessing string static methods.. when using string.this. i'm accessing methods class buttonz extendi...
Read more