This question already has an answer here:
Error was caused when Im trying to add DataBase to my app.I have SQLHelper.class,MainActivity.class.I want to store data from database and show then in ListView when I haven't the Internet access .Whats wrong? SQLHelper:
public class SqlHelper {
String title;
String description;
String image;
public static final String KEY_ROWID = "_id";
public static final String KEY_TITLE = "title";
public static final String KEY_DESCRIPTION = "description";
public static final String KEY_IMAGE = "image";
private SqlHelper mDb;
private static final String DATABASE_NAME = "DBCategory";
private static final String DATABASE_TABLE = "categoryTable";
private static final int DATABASE_VERSION = 1;
private DbHelper ourHelper;
private final Context ourContext;
private SQLiteDatabase ourDatabase;
public SqlHelper(Context c){
ourContext = c;
}
public SqlHelper open() throws SQLException{
ourHelper = new DbHelper(ourContext);
ourDatabase = ourHelper.getWritableDatabase();
return this;
}
public void close(){
ourHelper.close();
}
private static class DbHelper extends SQLiteOpenHelper{
public DbHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
// TODO Auto-generated constructor stub
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("CREATE TABLE " + DATABASE_TABLE + " (" +
KEY_ROWID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
KEY_TITLE + " TEXT NOT NULL," +KEY_DESCRIPTION +"TEXT NOT NULL ," +KEY_IMAGE + "TEXT NOT NULL );"
);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS " + DATABASE_TABLE);
onCreate(db);
}
}
public long createEntry(String title, String description,String image) {
ContentValues cv = new ContentValues();
cv.put(KEY_TITLE, title);
cv.put(KEY_DESCRIPTION,description);
cv.put(KEY_IMAGE, image);
return ourDatabase.insert(DATABASE_TABLE, null, cv);
}
public ArrayList<HashMap<String, String>> getAllData()
{
ArrayList<HashMap<String, String>> array_list = new ArrayList<HashMap<String, String>>();
//hp = new HashMap();
SQLiteDatabase db = this.ourHelper.getReadableDatabase();
Cursor res = db.rawQuery( "select * from categoryTable", null );
res.moveToFirst();
while(res.isAfterLast() == false){
HashMap<String,String> hashmap = new HashMap<String, String>();
hashmap.put("title", res.getString(res.getColumnIndex(title)));
hashmap.put("description", res.getString(res.getColumnIndex(description)));
hashmap.put("image", res.getString(res.getColumnIndex(image)));
array_list.add(hashmap);
res.moveToNext();
}
return array_list;
}
}
MainActivity:
public class MainActivity extends ListActivity {
private Context context;
SqlHelper dbHelper;
Intent intent;
private static String url = "http://ift.tt/1MiJRNN";
private static final String TITLE = "title";
private static final String DESCRIPTION = "description";
private static final String IMAGE = "image";
ArrayList<HashMap<String,String>> jsonlist = new ArrayList<HashMap<String, String>>();
ArrayList<HashMap<String,String>> bdList;
ListView lv;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
lv=(ListView) findViewById(android.R.id.list);
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
String title1 = jsonlist.get(position).get("title");
String description1 = jsonlist.get(position).get("description");
String url1 = jsonlist.get(position).get("image");
intent = new Intent(MainActivity.this, DetailInfo.class);
new ProgressTask(MainActivity.this).execute();
// bdList = dbHelper.getAllData();
intent.putExtra("title", title1);
intent.putExtra("description", description1);
intent.putExtra("url", url1);
startActivity(intent);
dbHelper = new SqlHelper(MainActivity.this);
try {
dbHelper.open();
} catch (SQLException e) {
e.printStackTrace();
}
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@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.reload) {
new ProgressTask(MainActivity.this).execute();
}
else if(id == R.id.menu_item_share){
Intent intent = new Intent(Intent.ACTION_SEND);
intent.setType("text/plain");
intent.putExtra(Intent.EXTRA_TEXT, "Put whatever you want");
startActivity(Intent.createChooser(intent,"Share via"));
}
return super.onOptionsItemSelected(item);
}
private class ProgressTask extends AsyncTask<String,Void,Boolean> {
private ProgressDialog dialog;
private ListActivity activity;
private Context context;
public ProgressTask(MainActivity activity) {
this.activity = activity;
context = activity;
dialog = new ProgressDialog(context);
}
protected void onPreExecute(){
this.dialog.setMessage("Progress start");
this.dialog.show();
}
protected void onPostExecute(final Boolean success){
try{
if((this.dialog != null)&& this.dialog.isShowing()){
this.dialog.dismiss();
}
CustomListAdapter adapter = new CustomListAdapter(MainActivity.this,jsonlist, R.layout.list_item,new String[]{TITLE,DESCRIPTION},new int[]{R.id.title,R.id.description});
lv.setAdapter(adapter);
//setListAdapter(adapter);
}catch (final IllegalArgumentException e){e.printStackTrace();}
}
protected Boolean doInBackground(String... args) {
JSONParser jParser = new JSONParser();
JSONArray json = jParser.getJSONFromUrl(url);
for(int i =0;i<json.length();i++) {
try {
JSONObject c = json.getJSONObject(i);
String vtitle = c.getString(TITLE);
String vdescription = c.getString(DESCRIPTION);
String vimage = c.getString(IMAGE);
dbHelper.createEntry(vtitle,vdescription,vimage);
// dbHelper.close();
HashMap<String, String> map = new HashMap<>();
map.put(TITLE, vtitle);
map.put(DESCRIPTION, vdescription);
map.put(IMAGE, vimage);
jsonlist.add(map);
} catch (JSONException e) {
e.printStackTrace();
}
}
return null;
}
}
/*private void displaysavedlv(){
Cursor cursor = dbHelper.fetchAllCountries();
CustomCursorAdapter adapter1 = new CustomCursorAdapter(MainActivity.this,cursor);
lv.setAdapter(adapter1);
}*/
/* private boolean isNetworkConnected() {
ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo ni = cm.getActiveNetworkInfo();
if (ni == null) {
// There are no active networks.
return false;
} else
return true;
}*/
}
Error:
09-24 14:35:16.965 17283-17648/com.example.vnvbnv.myapplication E/AndroidRuntime﹕ FATAL EXCEPTION: AsyncTask #1
java.lang.RuntimeException: An error occured while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:299)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352)
at java.util.concurrent.FutureTask.setException(FutureTask.java:219)
at java.util.concurrent.FutureTask.run(FutureTask.java:239)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
at java.lang.Thread.run(Thread.java:864)
Caused by: java.lang.NullPointerException
at com.example.vnvbnv.myapplication.MainActivity$ProgressTask.doInBackground(MainActivity.java:152)
at com.example.vnvbnv.myapplication.MainActivity$ProgressTask.doInBackground(MainActivity.java:117)
at android.os.AsyncTask$2.call(AsyncTask.java:287)
at java.util.concurrent.FutureTask.run(FutureTask.java:234)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
at java.lang.Thread.run(Thread.java:864)
09-24 14:35:17.315 17283-17283/com.example.vnvbnv.myapplication D/qdmemalloc﹕ ion: Unmapping buffer base:0x54cb6000 size:1536000
09-24 14:35:17.315 17283-17283/com.example.vnvbnv.myapplication D/qdmemalloc﹕ ion: Unmapping buffer base:0x48e5b000 size:4096
09-24 14:35:17.315 17283-17283/com.example.vnvbnv.myapplication D/qdmemalloc﹕ ion: Unmapping buffer base:0x54f5d000 size:1536000
09-24 14:35:17.315 17283-17283/com.example.vnvbnv.myapplication D/qdmemalloc﹕ ion: Unmapping buffer base:0x49151000 size:4096
09-24 14:35:17.315 17283-17283/com.example.vnvbnv.myapplication D/qdmemalloc﹕ ion: Unmapping buffer base:0x550d4000 size:1536000
09-24 14:35:17.325 17283-17283/com.example.vnvbnv.myapplication D/qdmemalloc﹕ ion: Unmapping buffer base:0x5040d000 size:4096
09-24 14:35:17.485 17283-17283/com.example.vnvbnv.myapplication D/qdmemalloc﹕ ion: Unmapping buffer base:0x5547f000 size:307200
09-24 14:35:17.525 17283-17283/com.example.vnvbnv.myapplication D/qdmemalloc﹕ ion: Unmapping buffer base:0x50cd7000 size:4096
09-24 14:35:17.525 17283-17283/com.example.vnvbnv.myapplication D/qdmemalloc﹕ ion: Unmapping buffer base:0x55520000 size:307200
09-24 14:35:17.525 17283-17283/com.example.vnvbnv.myapplication D/qdmemalloc﹕ ion: Unmapping buffer base:0x50d30000 size:4096
09-24 14:35:17.525 17283-17283/com.example.vnvbnv.myapplication D/qdmemalloc﹕ ion: Unmapping buffer base:0x5556b000 size:307200
09-24 14:35:17.525 17283-17283/com.example.vnvbnv.myapplication D/qdmemalloc﹕ ion: Unmapping buffer base:0x5111f000 size:4096
09-24 14:35:18.246 17283-17283/com.example.vnvbnv.myapplication E/WindowManager﹕ Activity com.example.vnvbnv.myapplication.MainActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{415417b0 V.E..... R......D 0,0-456,144} that was originally added here
android.view.WindowLeaked: Activity com.example.vnvbnv.myapplication.MainActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{415417b0 V.E..... R......D 0,0-456,144} that was originally added here
at android.view.ViewRootImpl.<init>(ViewRootImpl.java:458)
at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:216)
at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:94)
at android.app.Dialog.show(Dialog.java:286)
at com.example.vnvbnv.myapplication.MainActivity$ProgressTask.onPreExecute(MainActivity.java:129)
at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:586)
at android.os.AsyncTask.execute(AsyncTask.java:534)
at com.example.vnvbnv.myapplication.MainActivity.onOptionsItemSelected(MainActivity.java:106)
at android.app.Activity.onMenuItemSelected(Activity.java:2609)
at com.android.internal.policy.impl.PhoneWindow.onMenuItemSelected(PhoneWindow.java:1056)
at com.android.internal.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:735)
at com.android.internal.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:149)
at com.android.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:874)
at com.android.internal.view.menu.ActionMenuView.invokeItem(ActionMenuView.java:559)
at com.android.internal.view.menu.ActionMenuItemView.onClick(ActionMenuItemView.java:157)
at android.view.View.performClick(View.java:4231)
at android.view.View$PerformClick.run(View.java:17537)
at android.os.Handler.handleCallback(Handler.java:725)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:158)
at android.app.ActivityThread.main(ActivityThread.java:5751)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1083)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:850)
at dalvik.system.NativeStart.main(Native Method)
09-24 14:35:18.256 17283-17283/com.example.vnvbnv.myapplication I/Choreographer﹕ Skipped 35 frames! The application may be doing too much work on its main thread.
09-24 14:35:18.877 17283-17648/com.example.vnvbnv.myapplication D/Process﹕ killProcess, pid=17283
09-24 14:35:18.947 17283-17648/com.example.vnvbnv.myapplication D/Process﹕ dalvik.system.VMStack.getThreadStackTrace(Native Method)
09-24 14:35:19.067 17283-17648/com.example.vnvbnv.myapplication D/Process﹕ java.lang.Thread.getStackTrace(Thread.java:599)
09-24 14:35:19.067 17283-17648/com.example.vnvbnv.myapplication D/Process﹕ android.os.Process.killProcess(Process.java:1004)
09-24 14:35:19.097 17283-17648/com.example.vnvbnv.myapplication D/Process﹕ com.android.internal.os.RuntimeInit$UncaughtHandler.uncaughtException(RuntimeInit.java:123)
09-24 14:35:19.097 17283-17648/com.example.vnvbnv.myapplication D/Process﹕ java.lang.ThreadGroup.uncaughtException(ThreadGroup.java:693)
09-24 14:35:19.127 17283-17648/com.example.vnvbnv.myapplication D/Process﹕ java.lang.ThreadGroup.uncaughtException(ThreadGroup.java:690)
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