Here is my Arrival.java
package one.two;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import android.app.ListActivity;
import android.database.Cursor;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
public class Arrival extends ListActivity
{
private ListView listView;
/** Called when the activity is first created. */
public void onCreate(Bundle savedInstanceState)
{
ArrayList<String> retList = new ArrayList<String>();
System.out.println("Start onCreate Function\n");
super.onCreate(savedInstanceState);
setContentView(R.layout.listview);
System.out.println("In onCreate Function\n");
System.out.println("In of GetData\n");
DBAdapter db = new DBAdapter(this);
System.out.println("DB Open\n");
db.open();
System.out.println("DB Opened\n");
retList = getData();
System.out.println("Out of GetData\n");
// force count no. of records in table
// dump to check index
int cnt = 2;
int i=0;
for (i = 0; i<cnt; i++)
System.out.println(retList.toString());
System.out.println("Array 2 String\n");
Cursor c = db.getCursor();
String[] from = new String[] {DBAdapter.status};
int[] to = new int[] {R.id.txt1};
SimpleCursorAdapter mAdapter = new SimpleCursorAdapter(this, R.layout.listtext, c, from, to);
this.setListAdapter(mAdapter);
System.out.println("Show List\n");
db.close();
}
public static ArrayList<String> getData()
{
ArrayList<String> items = DBAdapter.getAllTitles();
System.out.println("Return a LIST titles\n");
return items;
}
}
DBAdapter.java
package one.two;
import java.util.List;
import android.app.ListActivity;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import java.util.ArrayList;
public class DBAdapter
{
public static String status = "status";
public String id = "id";
public String arrival = "arrival";
public String destination = "destination";
public String ferry = "ferry";
private static String DB_PATH = "/data/data/one.two/databases/";
private static final String DATABASE_NAME = "ferry.db";
private static final String DATABASE_TABLE = "port";
public static Context context;
public Cursor c;
public static SQLiteDatabase DbLib;
//overloaded non-null constructor
public DBAdapter(Context context)
{
DbLib = context.openOrCreateDatabase(DATABASE_NAME, SQLiteDatabase.CREATE_IF_NECESSARY,null);
System.out.println("OpenOrCreateDB Done");
}
public class DatabaseHelper extends SQLiteOpenHelper
{
Context context;
DatabaseHelper(Context context)
{
super(context, DATABASE_NAME, null, DATABASE_VERSION);
this.context = context;
}//end constructor DatabaseHelper
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion,
int newVersion)
{
}//end onUpgrade()
@Override
public void onCreate(SQLiteDatabase db)
{
}//end onCreate()
}// end class DatabaseHelper
private static DatabaseHelper DBHelper;
//private static SQLiteDatabase DbLib;
private static final int DATABASE_VERSION = 1;
//// context brought up /////////////
//private final Context context;
/*public void DBAdapter() throws SQLException
{
String myPath = DB_PATH + DATABASE_NAME;
db = SQLiteDatabase.openDatabase(myPath, null,
SQLiteDatabase.OPEN_READONLY);
}//end DBAdapter()*/
public static ArrayList<String> getAllTitles()
{
ArrayList<String> port = new ArrayList<String>();
Cursor c=null;
c = DbLib.query("port",
new String[] { "status", "id", "arrival",
"destination", "ferry" }, null, null,
null, null, null);
try {
if (c!=null) { // start - when there is at least 1 record
System.out.println("Cursor is NOT NULL");
int i =0;
for (c.moveToFirst(); !c.isAfterLast(); c.moveToNext())
{
// Debug Stm
System.out.println("Record No. "+i);
System.out.println(c.getString(0));
System.out.println(c.getString(1));
System.out.println(c.getString(2));
System.out.println(c.getString(3));
System.out.println(c.getString(4));
// Assign database cursor.records to arraylist
port.add(i,c.getString(0));
port.add(i,c.getString(1));
port.add(i,c.getString(2));
port.add(i,c.getString(3));
port.add(i,c.getString(4));
i = i + 1;
}
} // end - where there is at least 1 record
} finally {
if (c!=null) {
c.close();
}
}
return port;
}//end getAllTitles()
public void open() {
//Open the database
String myPath = DB_PATH + DATABASE_NAME;
DbLib = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
}
public Cursor getCursor(){
return c;
}
public void close()
{
DbLib.close();
}
}//end class DBAdapter
main.xml
<?xml version="1.0" encoding="utf-8"?>
<AbsoluteLayout
android:id="@+id/widget0"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android"
>
<TextView
android:id="@+id/widget32"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Ferry Hub"
android:textSize="25sp"
android:textStyle="bold"
android:textColor="#ff009999"
android:layout_x="97px"
android:layout_y="15px"
>
</TextView>
<TextView
android:id="@+id/widget35"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Arrival Time"
android:layout_x="116px"
android:layout_y="48px"
>
</TextView>
<TextView
android:id="@+id/Text1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=""
android:layout_x="200px"
android:layout_y="90px"
>
</TextView>
<Button
android:id="@+id/widget36"
android:layout_width="96px"
android:layout_height="40px"
android:text="Back"
android:layout_x="101px"
android:layout_y="299px"
>
</Button>
<ListView
android:layout_width="wrap_content"
android:layout_y="132dip"
android:layout_x="150dip"
android:id="@android:id/list"
android:layout_height="wrap_content">
</ListView>
</AbsoluteLayout>
Error from logcat:
07-23 07:00:45.625: ERROR/AndroidRuntime(725): Uncaught handler: thread main exiting due to uncaught exception
07-23 07:00:45.654: ERROR/AndroidRuntime(725): java.lang.RuntimeException: Unable to start activity ComponentInfo{one.two/one.two.Departure}: java.lang.ClassCastException: java.util.ArrayList
07-23 07:00:45.654: ERROR/AndroidRuntime(725): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2268)
07-23 07:00:45.654: ERROR/AndroidRuntime(725): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2284)
07-23 07:00:45.654: ERROR/AndroidRuntime(725): at android.app.ActivityThread.access$1800(ActivityThread.java:112)
07-23 07:00:45.654: ERROR/AndroidRuntime(725): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1692)
07-23 07:00:45.654: ERROR/AndroidRuntime(725): at android.os.Handler.dispatchMessage(Handler.java:99)
07-23 07:00:45.654: ERROR/AndroidRuntime(725): at android.os.Looper.loop(Looper.java:123)
07-23 07:00:45.654: ERROR/AndroidRuntime(725): at android.app.ActivityThread.main(ActivityThread.java:3948)
07-23 07:00:45.654: ERROR/AndroidRuntime(725): at java.lang.reflect.Method.invokeNative(Native Method)
07-23 07:00:45.654: ERROR/AndroidRuntime(725): at java.lang.reflect.Method.invoke(Method.java:521)
07-23 07:00:45.654: ERROR/AndroidRuntime(725): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:782)
07-23 07:00:45.654: ERROR/AndroidRuntime(725): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:540)
07-23 07:00:45.654: ERROR/AndroidRuntime(725): at dalvik.system.NativeStart.main(Native Method)
07-23 07:00:45.654: ERROR/AndroidRuntime(725): Caused by: java.lang.ClassCastException: java.util.ArrayList
07-23 07:00:45.654: ERROR/AndroidRuntime(725): at one.two.Departure.onCreate(Departure.java:27)
07-23 07:00:45.654: ERROR/AndroidRuntime(725): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1123)
07-23 07:00:45.654: ERROR/AndroidRuntime(725): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2231)
07-23 07:00:45.654: ERROR/AndroidRuntime(725): ... 11 more
May i know why isn’t there any data being shown on my ListView?
There are two errors in your code that I can spot at the moment. The first one should not be a problem. You are creating two ListAdapters and Setting them both.
The next thing is the way you define your SimpleCursorAdapter:
As seen in the Documentatio the SimpleCursorAdapter expects a id for a layout that will be used as a cell in the List. You are supplying the id of the list itself. The Adapter will now look for a layout file in your project that has the same id as the android list and then try to inflate this layout and find the views that are mentioned in the to array and set the values of the cursor to this values. That can not work. There should be an error visible in Logcat at least.
Also the to id that you are supplying should not be in your main layout but in the row layout itself. If this isn’t showing an Error are you sure that there is data in your Cursor at all?