Database Users

[Q] SQLite Force Close - first app

Hey everyone,
I'm trying to get started with SQLite. My app keeps force closing on this activity:
Code:
public class ViewActivity extends Activity {
private TextView company;
private BillMeDB dh;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.all);
company = (TextView) findViewById(R.id.Company1);
BillMeDB db = new BillMeDB(this);
db.open();
long id;
id = db.insertEntry("Power", "AEP", "item", "2010.9.15", "w2", "2010.9.24", "2011.1.1", 75.77);
id = db.insertEntry("Cell Phone", "Verizon", "item", "2010.9.15", "w2", "2010.9.24", "2011.1.1", 185.45);
Cursor c = db.getEntry(1);
if (c.moveToFirst())
company.setText(c.getString(1));
db.close();
// Cursor c = BillMeLoad.database.fetchAllEntries();
company.setText(this.dh.getEntry(0).toString());
}
}
I can't figure out why though. It blows up(I think) when it starts creating a DB. Here's my DB file - I have no idea where I've gone wrong, but apparently something isn't right. Can someone give me a hand?
My DB File:
Code:
package com.caleb.billme;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
public class BillMeDB {
public static final String KEY_BILLNAME = "billname";
public static final String KEY_COMPANY = "company";
public static final String KEY_ROWID = "_id";
public static final String KEY_ITEM = "item";
public static final String KEY_DUEDATE = "duedate";
public static final String KEY_REMFREQ = "remfreq";
public static final String KEY_REMDATE = "remdate";
public static final String KEY_ENDDATE = "enddate";
public static final String KEY_DUEAMNT = "dueamnt";
private static final String TAG = "BillMeDB";
private DatabaseHelper DBHelper;
private SQLiteDatabase db;
private static final String DATABASE_CREATE =
"CREATE TABLE BillTable (_id integer primary key autoincrement, "
+ "billname text not null, company text not null, item text not null, " +
"duedate text not null, remfreq text not null, " +
"remdate text not null, enddate text not null, dueamnt double not null)";
private static final String DATABASE_NAME = "Data";
private static final String DATABASE_TABLE = "BillTable";
private static final int DATABASE_VERSION = 2;
private final Context mCtx;
private static class DatabaseHelper extends SQLiteOpenHelper {
DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(DATABASE_CREATE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
Log.w(TAG, "Upgrading database from version " + oldVersion + " to "
+ newVersion + ", which will destroy all old data");
db.execSQL("DROP TABLE IF EXISTS BillTable");
onCreate(db);
}
}
public BillMeDB(Context ctx) {
mCtx = ctx;
}
public BillMeDB open() throws SQLException {
db = DBHelper.getWritableDatabase();
return this;
}
public void close() {
DBHelper.close();
}
public long insertEntry(String billname, String company, String item, String duedate, String remfreq, String remdate, String enddate, double dueamnt ) {
ContentValues initialValues = new ContentValues();
initialValues.put(KEY_BILLNAME, billname);
initialValues.put(KEY_COMPANY, company);
initialValues.put(KEY_ITEM, item);
initialValues.put(KEY_DUEDATE, duedate);
initialValues.put(KEY_REMFREQ, remfreq);
initialValues.put(KEY_REMDATE, remdate);
initialValues.put(KEY_ENDDATE, enddate);
initialValues.put(KEY_DUEAMNT, dueamnt);
return db.insert(DATABASE_TABLE, null, initialValues);
}
public boolean deleteAllEntries() {
return db.delete(DATABASE_TABLE, null, null) > 0;
}
public boolean deleteEntry(long rowId) {
return db.delete(DATABASE_TABLE, KEY_ROWID + "=" + rowId, null) > 0;
}
public Cursor getAllEntries() {
return db.query(DATABASE_TABLE, new String[] {
KEY_ROWID, KEY_BILLNAME,
KEY_COMPANY, KEY_ITEM,
KEY_DUEDATE, KEY_REMFREQ,
KEY_REMDATE, KEY_ENDDATE,
KEY_DUEAMNT},
null, null, null, null, null);
}
public Cursor getEntry(long rowId) throws SQLException{
Cursor c = db.query(DATABASE_TABLE, new String[] {
KEY_ROWID,
KEY_BILLNAME }, KEY_ROWID + "=" + rowId,
null, null, null, null);
if (c != null)
c.moveToFirst();
return c;
}
public boolean updateEntry(long rowId, String billname, String company, String item,
String duedate, String remfreq, String remdate, String enddate, double dueamnt) {
ContentValues args = new ContentValues();
args.put(KEY_BILLNAME, billname);
args.put(KEY_COMPANY, company);
args.put(KEY_ITEM, item);
args.put(KEY_DUEDATE, duedate);
args.put(KEY_REMFREQ, remfreq);
args.put(KEY_REMDATE, remdate);
args.put(KEY_ENDDATE, enddate);
args.put(KEY_DUEAMNT, dueamnt);
return db.update(DATABASE_TABLE, args, KEY_ROWID + "=" + rowId, null) > 0;
}
}

in BillMeDB.java change
Code:
public BillMeDB(Context ctx) {
mCtx = ctx;
}
to
Code:
public BillMeDB(Context ctx) {
mCtx = ctx;
DBHelper = new DatabaseHelper(mCtx);
}
also in ViewActivity.java
Code:
company.setText(this.dh.getEntry(0).toString());
i guess you are trying to display both the KEY_ROWID and KEY_BILLNAME but i think you can't treat a cursor like that. you must first use getEntry(rowId) to get the cursor and then use getString(columnIndex) like you did with getEntry(1). maybe something like
(you must do this before closing the db)
Code:
c = db.getEntry(2);
if (c.moveToFirst())
company.setText(c.getString(0) + "\t" + c.getString(1));

[Q] My App use API of Google Maps but the map is slow

Hello Boys,
I am a new Android developer and I'm developing an app with the API of Google Maps.
Into an area of the map I place many markers.
The application works correctly, but the map scroolling and the map zoom isn't quick, everything goes slow.
The marker that I have included in the map is in the "png" format image, and his weighs is approximately 600 bytes.
it is possible that many marker object cause low map scrool?
this is the code of my APP:
Code:
plublic class IDC extends MapActivity {
private LocationManager locationManager;
private LocationListener locationListener;
private MapController mc;
private MapView mapView;
private String myPosition;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
String errore="";
myPosition="";
try{
mapView = (MapView) findViewById(R.id.mapview);
mc = mapView.getController();
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
locationListener = new GPSLocationListener();
//getMyLocation();
MyDBHelper myDB = new MyDBHelper(IDS.this);
Cursor cursor= myDB.query(new String[] { "x", "y", "y2", "w", "k", "latitude", "longitude"});
//Log.i("NOMI", "TOT. NOMI"+cursor.getCount());
List<Overlay> mapOverlays = mapView.getOverlays();
Drawable drawable = this.getResources().getDrawable(R.drawable.mm_20_blue);
MyItemizedOverlay itemizedoverlay = new MyItemizedOverlay(drawable,IDS.this);
List<Address> address = new ArrayList<Address>();
Log.i("TOT TUPLE", " = "+cursor.getCount());
while(cursor.moveToNext()){
String s= cursor.getString(0);
errore=s;
String nome[]=s.split("-");
// Log.i("Pos Colonna NOME", ""+cursor.getColumnIndex("nome"));
// Log.i("Pos. in Colonna", ""+cursor.getString(0));
//address.addAll(gc.getFromLocationName(nome[1], 1));
//Address a= address.get(address.size()-1);
String la=cursor.getString(5);
String lo=cursor.getString(6);
double latitude= Double.parseDouble(la);
double longitude= Double.parseDouble(lo);
int lan= (int)(latitude*1E6);
int lon= (int)(longitude*1E6);
GeoPoint point = new GeoPoint(lan, lon);
String tel1=cursor.getString(1);
String tel2=cursor.getString(2);
String mail=cursor.getString(4);
String web=cursor.getString(3);
String info[]= {tel1,tel2,nome[1],web,mail};
MyOverlayItem overlayitem = new MyOverlayItem(point, "Hello", nome[0], info);
//mc.animateTo(point);
itemizedoverlay.addOverlay(overlayitem);
mapOverlays.add(itemizedoverlay);
}
mapView.setBuiltInZoomControls(true);
mc.setZoom(6);
}catch (Exception e) {
e.printStackTrace();
}
}
}
Code:
public class MyItemizedOverlay extends ItemizedOverlay {
private ArrayList<OverlayItem> mOverlays = new ArrayList<OverlayItem>();
private Context mContext;
private CustomizeDialog customizeDialog;
public MyItemizedOverlay(Drawable defaultMarker) {
super(boundCenterBottom(defaultMarker));
}
public MyItemizedOverlay(Drawable defaultMarker, Context context) {
super(boundCenterBottom(defaultMarker));
mContext = context;
}
protected boolean onTap(int index)
MyOverlayItem item = (MyOverlayItem) mOverlays.get(index);
customizeDialog = new CustomizeDialog(mContext);
customizeDialog.setPersonalText(item.getSnippet());
String []info= item.getInfo();
customizeDialog.setT1(info[0]);
customizeDialog.setT2(info[1]);
customizeDialog.setA(info[2]);
customizeDialog.setW(info[3]);
customizeDialog.setM(info[4]);
customizeDialog.show();
return true;
}
protected OverlayItem createItem(int i) {
return mOverlays.get(i);
}
public int size() {
return mOverlays.size();
}
public void addOverlay(OverlayItem overlay) {
mOverlays.add(overlay);
populate();
}
}
what is the problem??....PLEASE, HELP ME!!

FC when using interface to launch new fragment form listView

I have an async task that loads a list view of items. I am currently trying to set the onClick to load a new fragment with an "id" that is being retrieved from the list item that is clicked. I have no errors in my code that the Android Studio shows me.
When I run the app and click on the item in the list view I get this FC:
02-13 19:49:56.813 20334-20334/com.beerportfolio.beerportfoliopro E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.NullPointerException
at com.beerportfolio.beerportfoliopro.ReadJSONResult$1.onItemClick(ReadJSONResult.java:140)
at android.widget.AdapterView.performItemClick(AdapterView.java:298)
at android.widget.AbsListView.performItemClick(AbsListView.java:1237)
at android.widget.ListView.performItemClick(ListView.java:4555)
at android.widget.AbsListView$PerformClick.run(AbsListView.java:3037)
at android.widget.AbsListView$1.run(AbsListView.java:3724)
at android.os.Handler.handleCallback(Handler.java:730)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:158)
at android.app.ActivityThread.main(ActivityThread.java:5789)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1027)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:843)
at dalvik.system.NativeStart.main(Native Method)
02-13 19:50:42.112 20864-20870/? E/jdwp﹕ Failed sending reply to debugger: Broken pipe
line 140 in ReadJSONResult is:
listenerBeer.onArticleSelected(idToSend);
That line is part of this whole onClick:
//set up clicks
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@override
public void onItemClick(AdapterView<?> arg0, View arg1,
int arg2, long arg3) {
BeerData beerInfo = beerList.get(arg2);
String idToSend = beerInfo.beerId;
//todo: launch beer fragment
listenerBeer.onArticleSelected(idToSend);
}
});
All the code for ReadJSONResult is:
public class ReadJSONResult extends AsyncTask<String, Void, String> {
Context c;
private ProgressDialog Dialog;
public ReadJSONResult(Context context)
{
c = context;
Dialog = new ProgressDialog(c);
}
//code for on click
OnArticleSelectedListener listenerBeer;
public interface OnArticleSelectedListener{
public void onArticleSelected(String myString);
}
public void setOnArticleSelectedListener(OnArticleSelectedListener listener){
this.listenerBeer = listener;
}
//end code for onClick
@override
protected String doInBackground(String... arg0) {
// TODO Auto-generated method stub
return readJSONFeed(arg0[0]);
}
protected void onPreExecute() {
Dialog.setMessage("Searching Beer Cellar");
Dialog.setTitle("Loading");
Dialog.setCancelable(false);
Dialog.show();
}
protected void onPostExecute(String result){
//decode json here
try{
JSONObject json = new JSONObject(result);
//acces listview
ListView lv = (ListView) ((Activity) c).findViewById(android.R.id.list);
//make array list for beer
final List<BeerData> beerList = new ArrayList<BeerData>();
//get json items
for(int i = 0; i < json.getJSONArray("data").length(); i++) {
String beerId = GetBeerDataFromJSON(i,"id", json);
String beerName = GetBeerDataFromJSON(i,"name", json);
String beerDescription = GetBeerDataFromJSON(i,"description" , json);
String beerAbv = GetBeerDataFromJSON(i,"abv" , json);
String beerIbu = GetBeerDataFromJSON(i,"ibu" , json);
String beerIcon = GetBeerIconsFromJSON(i, "icon",json );
String beerMediumIcon = GetBeerIconsFromJSON(i, "medium",json );
String beerLargeIcon = GetBeerIconsFromJSON(i, "large",json );
String beerGlass = GetBeerGlassFromJSON(i, json );
String beerStyle = GetBeerStyleFromJSON(i,"name", json );
String beerStyleDescription = GetBeerStyleFromJSON(i,"description", json );
String beerBreweryId = GetBeerBreweryInfoFromJSON(i, "id", json );
String beerBreweryName = GetBeerBreweryInfoFromJSON(i, "name", json );
String beerBreweryDescription = GetBeerBreweryInfoFromJSON(i, "description", json );
String beerBreweryWebsite = GetBeerBreweryInfoFromJSON(i, "website", json );
//get long and latt
String beerBreweryLat = GetBeerBreweryLocationJSON(i, "longitude", json );
String beerBreweryLong = GetBeerBreweryLocationJSON(i, "latitude", json );
String beerBreweryYear = GetBeerBreweryInfoFromJSON(i, "established", json );
String beerBreweryIcon = GetBeerBreweryIconsFromJSON(i,"large",json);
//create beer object
BeerData thisBeer = new BeerData(beerName, beerId, beerDescription, beerAbv, beerIbu, beerIcon,
beerMediumIcon,beerLargeIcon, beerGlass, beerStyle, beerStyleDescription, beerBreweryId, beerBreweryName,
beerBreweryDescription, beerBreweryYear, beerBreweryWebsite,beerBreweryIcon, beerBreweryLat, beerBreweryLong);
//add beer to list
beerList.add(thisBeer);
}
//update listview
BeerSearchAdapter adapter1 = new BeerSearchAdapter(c ,R.layout.listview_item_row, beerList);
lv.setAdapter(adapter1);
//set up clicks
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@override
public void onItemClick(AdapterView<?> arg0, View arg1,
int arg2, long arg3) {
BeerData beerInfo = beerList.get(arg2);
String idToSend = beerInfo.beerId;
//todo: launch beer fragment
listenerBeer.onArticleSelected(idToSend);
}
});
}
catch(Exception e){
}
Dialog.dismiss();
}
//todo: all the get functions go here
private String GetBeerDataFromJSON(int position, String whatToGet, JSONObject json ) {
String whatIsTheKeyYouAreLookFor = whatToGet;
int whereInTheJSONArrayForLoopIsTheData = position;
String holder = "";
try{
holder = json.getJSONArray("data").getJSONObject(whereInTheJSONArrayForLoopIsTheData).getString(whatIsTheKeyYouAreLookFor);
} catch (JSONException e) {
holder = "N/A";
}
return holder;
}
//get icons
private String GetBeerBreweryIconsFromJSON(int position, String whatToGet, JSONObject json ) {
String whatIsTheKeyYouAreLookFor = whatToGet;
int whereInTheJSONArrayForLoopIsTheData = position;
String holder = "";
try{
holder = json.getJSONArray("data").getJSONObject(whereInTheJSONArrayForLoopIsTheData).getJSONArray("breweries").getJSONObject(0).getJSONObject("images").getString(whatIsTheKeyYouAreLookFor);;
} catch (JSONException e) {
holder = "N/A";
}
return holder;
}
//get icons
private String GetBeerIconsFromJSON(int position, String whatToGet, JSONObject json ) {
String whatIsTheKeyYouAreLookFor = whatToGet;
int whereInTheJSONArrayForLoopIsTheData = position;
String holder = "";
try{
holder = json.getJSONArray("data").getJSONObject(whereInTheJSONArrayForLoopIsTheData).getJSONObject("labels").getString(whatIsTheKeyYouAreLookFor);
} catch (JSONException e) {
holder = "N/A";
}
return holder;
}
//get style information
private String GetBeerStyleFromJSON(int position, String whatToGet, JSONObject json ) {
String whatIsTheKeyYouAreLookFor = whatToGet;
int whereInTheJSONArrayForLoopIsTheData = position;
String holder = "";
try{
holder = json.getJSONArray("data").getJSONObject(whereInTheJSONArrayForLoopIsTheData).getJSONObject("style").getString(whatIsTheKeyYouAreLookFor);
} catch (JSONException e) {
holder = "N/A";
}
return holder;
}
//get location data
private String GetBeerBreweryLocationJSON(int position, String whatToGet, JSONObject json ) {
String whatIsTheKeyYouAreLookFor = whatToGet;
int whereInTheJSONArrayForLoopIsTheData = position;
String holder = "";
try{
holder = json.getJSONArray("data").getJSONObject(whereInTheJSONArrayForLoopIsTheData).getJSONArray("breweries").getJSONObject(0).getJSONArray("locations").getJSONObject(0).getString(whatIsTheKeyYouAreLookFor);
} catch (JSONException e) {
holder = "N/A";
}
return holder;
}
//get brewery information
//get style information
private String GetBeerBreweryInfoFromJSON(int position, String whatToGet, JSONObject json ) {
String whatIsTheKeyYouAreLookFor = whatToGet;
int whereInTheJSONArrayForLoopIsTheData = position;
String holder = "";
try{
holder = json.getJSONArray("data").getJSONObject(whereInTheJSONArrayForLoopIsTheData).getJSONArray("breweries").getJSONObject(0).getString(whatIsTheKeyYouAreLookFor);
} catch (JSONException e) {
holder = "N/A";
}
return holder;
}
//get glass
private String GetBeerGlassFromJSON(int position, JSONObject json ) {
int whereInTheJSONArrayForLoopIsTheData = position;
String holder = "";
try{
holder = json.getJSONArray("data").getJSONObject(whereInTheJSONArrayForLoopIsTheData).getJSONObject("glass").getString("name");
} catch (JSONException e) {
holder = "N/A";
}
return holder;
}
public String readJSONFeed(String URL) {
StringBuilder stringBuilder = new StringBuilder();
HttpClient httpClient = new DefaultHttpClient();
HttpGet httpGet = new HttpGet(URL);
try {
HttpResponse response = httpClient.execute(httpGet);
StatusLine statusLine = response.getStatusLine();
int statusCode = statusLine.getStatusCode();
if (statusCode == 200) {
HttpEntity entity = response.getEntity();
InputStream inputStream = entity.getContent();
BufferedReader reader = new BufferedReader(
new InputStreamReader(inputStream));
String line;
while ((line = reader.readLine()) != null) {
stringBuilder.append(line);
}
inputStream.close();
} else {
Log.d("JSON", "Failed to download file");
}
} catch (Exception e) {
Log.d("readJSONFeed", e.getLocalizedMessage());
}
return stringBuilder.toString();
}
}
BeerSearchAdapter is:
public class BeerSearchAdapter extends ArrayAdapter<BeerData> {
Context context;
int layoutResourceId;
List<BeerData> data = null;
public BeerSearchAdapter(Context context, int layoutResourceId, List<BeerData> data) {
super(context, layoutResourceId, data);
this.layoutResourceId = layoutResourceId;
this.context = context;
this.data = data;
}
@override
public View getView(int position, View convertView, ViewGroup parent) {
View row = convertView;
beerHolder holder = null;
if(row == null)
{
LayoutInflater inflater = ((Activity)context).getLayoutInflater();
row = inflater.inflate(layoutResourceId, parent, false);
holder = new beerHolder();
holder.txtBrewery = (TextView)row.findViewById(R.id.beerBreweryNameList);
holder.txtTitle = (TextView)row.findViewById(R.id.beerNameList);
row.setTag(holder);
}
else
{
holder = (beerHolder)row.getTag();
}
BeerData beer = data.get(position);
holder.txtTitle.setText(beer.beerName);
holder.txtBrewery.setText(beer.beerBreweryName);
return row;
}
static class beerHolder
{
TextView txtBrewery;
TextView txtTitle;
}
}
My Search.java where the interface comes form is here:
public class Search extends Fragment implements SearchView.OnQueryTextListener, ReadJSONResult.OnArticleSelectedListener {
private ListView lv;
View v;
@override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
//set layout here
v = inflater.inflate(R.layout.activity_search, container, false);
setHasOptionsMenu(true);
getActivity().setTitle("Search");
//get user information
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getActivity());
String userName = prefs.getString("userName", null);
String userID = prefs.getString("userID", null);
//todo: code body goes here
// Inflate the layout for this fragment
return v;
}
@override
public void onCreateOptionsMenu (Menu menu, MenuInflater inflater) {
// Inflate the menu; this adds items to the action bar if it is present.
super.onCreateOptionsMenu(menu, inflater);
Log.d("click", "inside the on create");
//inflater.inflate(R.menu.main, menu);
SearchView searchView = (SearchView) menu.findItem(R.id.menu_search2).getActionView();
searchView.setIconified(false);
searchView.setOnQueryTextListener(this);
}
public boolean onQueryTextSubmit (String query) {
//toast query
//make json variables to fill
// url to make request
String url = "myURL";
try {
query = URLEncoder.encode(query, "UTF-8");
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
String jsonUrl = url + query;
//todo: get json
new ReadJSONResult(getActivity()).execute(jsonUrl);
return false;
}
@override
public boolean onQueryTextChange(String newText) {
// TODO Auto-generated method stub
return false;
}
@override
public void onArticleSelected(String b){
//code to execute on click
Fragment Fragment_one;
FragmentManager man= getFragmentManager();
FragmentTransaction tran = man.beginTransaction();
//todo: set to beer fragment
Fragment_one = new StylePage2();
final Bundle bundle = new Bundle();
bundle.putString("beerIDSent", b);
Fragment_one.setArguments(bundle);
tran.replace(R.id.main, Fragment_one);//tran.
tran.addToBackStack(null);
tran.commit();
}
}
Let me know if you need any other code, I am stomped on this and could use a second pair of eyes. Thanks.

[Q] How to stop the ball at touch release

hi, its killing me i can't fix it i made this thing because i was learning Canvas and drawing on android !
i included moving animations (smooth) but i removed it
Code:
package com.example.graphics;
import android.content.Context;
import android.view.KeyEvent;
import android.view.MotionEvent;
import java.util.Formatter;
import android.graphics.Typeface;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RectF;
import android.view.View;
public class BouncingBallView extends View {
private int xMin = 0; // This view's bounds
private int xMax;
private int yMin = 0;
private int yMax;
private float ballRadius = 80; // Ball's radius
private float ballX = ballRadius + 20; // Ball's center (x,y)
private float ballY = ballRadius + 40;
private float ballSpeedX = 11; // Ball's speed (x,y)
private float ballSpeedY = 7;
//private RectF ballBounds; // Needed for Canvas.drawOval
private Paint paint; // The paint (e.g. style, color) used for drawing
// Status message to show Ball's (x,y) position and speed.
private StringBuilder statusMsg = new StringBuilder();
private Formatter formatter = new Formatter(statusMsg); // Formatting the statusMsg
private float previousX;
private float previousY;
private float currentX;
private float currentY;
private float scale;
private int ifdrawcount = 0;
// Constructor
public BouncingBallView(Context context) {
super(context);
//ballBounds = new RectF();
paint = new Paint();
paint.setTypeface(Typeface.MONOSPACE);
paint.setTextSize(25);
setFocusableInTouchMode(true);
//setFocusable(true);
requestFocus();
}
/*public boolean onKeyUp(int keyCode, KeyEvent event) {
switch (keyCode) {
case KeyEvent.KEYCODE_DPAD_RIGHT: // Increase rightward speed
ballSpeedX++;
break;
case KeyEvent.KEYCODE_DPAD_LEFT: // Increase leftward speed
ballSpeedX--;
break;
case KeyEvent.KEYCODE_DPAD_UP: // Increase upward speed
ballSpeedY--;
break;
case KeyEvent.KEYCODE_DPAD_DOWN: // Increase downward speed
ballSpeedY++;
break;
case KeyEvent.KEYCODE_DPAD_CENTER: // Stop
ballSpeedX = 0;
ballSpeedY = 0;
break;
case KeyEvent.KEYCODE_A: // Zoom in
// Max radius is about 90% of half of the smaller dimension
float maxRadius = (xMax > yMax) ? yMax / 2 * 0.9f : xMax / 2 * 0.9f;
if (ballRadius < maxRadius) {
ballRadius *= 1.05; // Increase radius by 5%
}
break;
case KeyEvent.KEYCODE_Z: // Zoom out
if (ballRadius > 20) { // Minimum radius
ballRadius *= 0.95; // Decrease radius by 5%
}
break;
}
return true; // Event handled
}*/
// Called back to draw the view. Also called by invalidate().
@Override
protected void onDraw(Canvas canvas) {
// Draw the ball
//ballBounds.set(ballX-ballRadius, ballY-ballRadius, ballX+ballRadius, ballY+ballRadius);
//paint.setColor(Color.GRAY);
//canvas.drawOval(ballBounds, paint);
//canvas.drawCircle(70, yMax -70, 60, paint);
//canvas.drawCircle(xMax -70, yMax -60, 60, paint);
paint.setColor(Color.GREEN);
canvas.drawCircle(ballX, ballY, ballRadius, paint);
// Draw the status message
paint.setColor(Color.WHITE);
paint.setStrokeWidth(2);
canvas.drawText(statusMsg.toString(), 10, 30, paint);
if(ifdrawcount > 0){
canvas.drawLine(previousX, previousY, currentX, currentY, paint);
paint.setStrokeWidth(10);
paint.setColor(Color.BLACK);
canvas.drawPoint(previousX,previousY,paint);
ifdrawcount--;
}
// Update the position of the ball, including collision detection and reaction.
update();
// Delay
try {
Thread.sleep(16);
} catch (InterruptedException e) { }
invalidate(); // Force a re-draw
}
// Touch-input handler
@Override
public boolean onTouchEvent(MotionEvent event) {
currentX = event.getX();
currentY = event.getY();
ifdrawcount = 10;
//float deltaX, deltaY;
scale = 20.0f / ((xMax > yMax) ? yMax : xMax);
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
previousX = currentX;
previousY = currentY;
case MotionEvent.ACTION_MOVE:
ballSpeedY = (currentY - previousY) * scale;
ballSpeedX = (currentX - previousX) * scale;
case MotionEvent.ACTION_UP:
ballSpeedX = 0;
ballSpeedY = 0;
}
return true; // Event handled
}
// Detect collision and update the position of the ball.
private void update() {
// Get new (x,y) position
ballX += ballSpeedX;
ballY += ballSpeedY;
/*if(ifdrawcount == 0)
ballSpeedX = 0; ballSpeedY = 0;*/
// Detect collision and react
if (ballX + ballRadius > xMax) {
ballSpeedX = -ballSpeedX;
ballX = xMax-ballRadius;
} else if (ballX - ballRadius < xMin) {
ballSpeedX = -ballSpeedX;
ballX = xMin+ballRadius;
}
if (ballY + ballRadius > yMax) {
ballSpeedY = -ballSpeedY;
ballY = yMax - ballRadius;
} else if (ballY - ballRadius < yMin) {
ballSpeedY = -ballSpeedY;
ballY = yMin + ballRadius;
}
// Build status message
statusMsg.delete(0, statusMsg.length()); // Empty buffer
formatter.format("%3.0f %3.0f || %3.0f %3.0f", ballSpeedX, ballSpeedY,ballX,ballY);
}
// Called back when the view is first created or its size changes.
@Override
public void onSizeChanged(int w, int h, int oldW, int oldH) {
// Set the movement bounds for the ball
xMax = w-1;
yMax = h-1;
}
}
the problem is my ball doesn't move at all, but i see the line, once i remove the line:
Code:
case MotionEvent.ACTION_UP:
ballSpeedX = 0;
ballSpeedY = 0;
it works, but you know, after release it continues with same speed :! its like the ACTION_UP is always the case, !!! any idea why it doesn't work, how to stop the ball once the user releases the screen?

also sorry if this is not the right place. i searched the forums, i got confused i didn't find anyplace to ask this question so i tough this is the best place!

How do I implement a onscroll Listener to my listview?

I have a large data to load from JSON.
I have implemented a custom list view by following a tutorial, now since the data is huge I want it load as the user scrolls.
This is my LoadRestaurant class code which is inside the main activity.
Code:
class LoadRestaurants extends AsyncTask<String, String, String> {
//Show Progress Dialog
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(SearchAll.this);
pDialog.setMessage("Loading All Restaurants...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
protected String doInBackground(String... arg) {
//building parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
//Getting JSON from URL
String json = jsonParser.makeHttpRequest(URL_RESTAURANT_LIST, "GET", params);
//Log Cat Response Check
Log.d("Areas JSON: ", "> " + json);
try {
restaurants = new JSONArray(json);
if (restaurants != null) {
//loop through all restaurants
for (int i = 0; i < restaurants.length(); i++) {
JSONObject c = restaurants.getJSONObject(i);
//Storing each json object in the variable.
String id = c.getString(TAG_ID);
String name = c.getString(TAG_NAME);
String location = c.getString(TAG_LOCATION);
String rating = c.getString(TAG_RATING);
//Creating New Hashmap
HashMap<String, String> map = new HashMap<String, String>();
//adding each child node to Hashmap key
map.put(TAG_ID, id);
map.put(TAG_NAME, name);
map.put(TAG_LOCATION, location);
map.put(TAG_RATING, rating);
//adding HashList to ArrayList
restaurant_list.add(map);
}
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
protected void onPostExecute(String file_url) {
//dismiss the dialog
pDialog.dismiss();
//Updating UI from the Background Thread
runOnUiThread(new Runnable() {
@Override
public void run() {
ListAdapter adapter = new SimpleAdapter(
SearchAll.this, restaurant_list,
R.layout.listview_restaurants, new String[]{
TAG_ID, TAG_NAME, TAG_LOCATION, TAG_RATING}, new int[]{
R.id.login_id, R.id.restaurant_name, R.id.address, R.id.rating});
setListAdapter(adapter);
ListView lv = getListView();
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
// Bundle bundle = new Bundle();
Intent intent = new Intent(SearchAll.this, RestaurantProfile.class);
String loginId = ((TextView) view.findViewById(R.id.login_id)).getText().toString();
intent.putExtra("login_id", loginId);
startActivity(intent);
}
});
}
});
}
}
}
I want to load around 20 restaurants and then it auto loads another 20 as soon as user reaches the end of first 20.
There are lots of tutorials online but its confusing to implement.
Please help me out!

The custom ListView, support for automatic loading you can try https://github.com/chrisbanes/Android-PullToRefresh