Develop Reference

Retrieve image names from sqlite

I have a database and I have two columns
Name of the first column: Img
Name of the second column: Name
I want to show them in Listview
There is no problem displaying names
But there is a problem with displaying pictures What is the solution?
ِAdbter Listview
public class adbter_listview extends ArrayAdapter<String> {
Activity activity;
ArrayList<Integer> icons;
ArrayList<String> name;
public adbter_listview(Activity activity, ArrayList<Integer> icons, ArrayList<String> name) {
super(activity, R.layout.custom_listview, name);
this.activity = activity;
this.icons = icons;
this.name = name;
}
#NonNull
#Override
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = activity.getLayoutInflater();
View v = inflater.inflate(R.layout.custom_listview, parent, false);
ImageView iv = (ImageView) v.findViewById(R.id.imageView);
TextView tv = (TextView) v.findViewById(R.id.textView);
iv.setImageResource(icons.get(position));
tv.setText(name.get(position));
return v;
}
}
MainActivity
public class MainActivity extends AppCompatActivity {
ListView con;
ArrayList<String> icons_name = new ArrayList<>();
ArrayList<Integer> icons = new ArrayList<>();
ArrayList<String> name = new ArrayList<>();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
con = (ListView) findViewById(R.id.con);
db connect = new db(MainActivity.this);
SQLiteDatabase read = connect.getReadableDatabase();
Cursor save = read.rawQuery("select image from game",null);
save.moveToFirst();
while(save.isAfterLast()==false)
{
icons_name.add(save.getString(0));
icons.add(R.drawable.user);
save.moveToNext();
}
adbter_listview adb = new adbter_listview(MainActivity.this,icons,name);
con.setAdapter(adb);
}
}
please help me

Get int id of drawable using this line,
int drawableResourceId = this.getResources().getIdentifier("nameOfDrawable", "drawable", this.getPackageName());
In your case
nameOfDrawable = save.getString(0); I guess
then add into icons arrayList,
icons.add(drawableResourceId);
Hope this will work.

Instead of this
icons.add(R.drawable.user);
Use
icons.add(Integer.parseInt(save.getString(1)));
in adapter it should work only if the images are from drawables folder and use it like
R.drawable.icons.get(position)
But first remove the database call from the oncreate mainThread call to a different thread. Either create a new Thread or use asynctask or use loaders. Don't make a sqlitedatabase call in mainthread.

Values are not Populating in Listview [duplicate]

This question already has answers here:
Custom Adapter getView() method is not called
(6 answers)
Closed 7 years ago.
I am trying to develop an android application that can display values from multiple tables.
I have used a Base Adapter to display the values since i just need to display the queried values in a list. But when I try to display the values in the list view it is blank.
I am not sure what I have done wrong.
I am Using the below method to query the data from the database to display only the required values.
public Cursor getAssetInStore()
{
SQLiteDatabase db_database = getReadableDatabase();
Cursor c = db_database.rawQuery("SELECT asset_name,warrenty,AssetImage,asset_status FROM `Assets`,`AseetIssued` WHERE Assets.Assetid = AseetIssued.Assetissuedid AND asset_status =?" ,
new String [] {"In Storage"}, null);
return c;
}
The below methods are used to populate the values onto the list view.
private void populateAssetListView()
{
Cursor c = db_database.getAssetInStore();
AssetListView.setAdapter(new AssetListAdapter(this, c));
}
public class AssetListAdapter extends BaseAdapter
{
private Context mContext;
Cursor cursor;
public AssetListAdapter(Context context, Cursor c) {
super();
mContext = context;
cursor =c ;
}
#Override
public int getCount() {
return 0;
}
#Override
public Object getItem(int position) {
return null;
}
#Override
public long getItemId(int position) {
return 0;
}
#Override
public View getView(int position, View view, ViewGroup parent) {
LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
//The layout is assigned to the custome created created in this case it is customeassetview the cales will be displayed as per this list
view = inflater.inflate(R.layout.assetsinstore_placeholder, null);
cursor.moveToPosition(position);
TextView Assetsstatus = (TextView) view.findViewById(R.id.Assetssatutsstore_view);
int status = cursor.getInt(cursor.getColumnIndex("asset_status"));
Assetsstatus .setText(String.valueOf(status));
TextView Assetsname = (TextView) view.findViewById(R.id.Assetstore_name_view);
String Assetname = cursor.getString(cursor.getColumnIndex("asset_name"));
Assetsname.setText(Assetname);
TextView Warrenty = (TextView) view.findViewById(R.id.Assetstore_Warrenty_view);
String CustDesignation = cursor.getString(cursor.getColumnIndex("warrenty"));
Warrenty .setText(CustDesignation);
ImageView AssetImage = (ImageView) view.findViewById(R.id.list_image);
byte[] bb = cursor.getBlob(cursor.getColumnIndex("AssetImage"));
AssetImage.setImageBitmap(BitmapConver.getPhoto(bb));
return view;
}
}

Try to use a cursor adapter in place of a base adapter. Moreover, beware that the position you're passing to the cursor may not be what you think.

Android notifyDatasetChange with SQLite cursor how to?

So I have 2 activities.
The first (ActivityOne) displays a listview with data from SQLite cursor, and a button.
On click of that button, I want to add an item to the listview, so I display the second activity (ActivityTwo), that contains a number of editTexts and a save Button, that does the saving in the Database.
But what I want is:
after saving the new item to the DB, the ActivityTwo should close and the ActivityOne should be displayed with the refreshed content from the DB
.
This seems a reasonable workflow. How do I achieve it?
Code for ActivityOne:
public class ActivityOne extends Activity {
private ArrayList<String> idclient = new ArrayList<String>();
private ArrayList<String> numeclient = new ArrayList<String>();
private ArrayList<String> tipclient = new ArrayList<String>();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
ListView mylist = (ListView) findViewById(R.id.lv_clienti);
LoadList();
Button btnex = (Button) findViewById(R.id.btnNewCli);
btnex.setOnClickListener(
new View.OnClickListener()
{
public void onClick(View aView)
{
Toast.makeText(getApplicationContext(), "Add new client... " , Toast.LENGTH_SHORT).show();
Intent toAnotherActivity = new Intent(aView.getContext(), NewClientActivity.class);
startActivity(toAnotherActivity);
}
}
);
}
public void LoadList(){
SQLiteDatabase db = new myDbHelper(getApplicationContext()).getWritableDatabase();
Cursor mCursor = db.rawQuery("select idclient,nameclient,typeclient from clienti order by numeclient" , null);
idclient.clear();
numeclient.clear();
tipclient.clear();
if (mCursor.moveToFirst()) {
do {
idclient.add(Integer.toString(mCursor.getInt(0)));
nameclient.add(mCursor.getString(1));
typeclient.add(mCursor.getString(2));
} while (mCursor.moveToNext());
}
DisplayClientiAdapter disadpt = new DisplayClientiAdapter(ClientiActivity.this,idclient,nameclient, typeclient);
ListView lv = (ListView) findViewById(R.id.lv_clienti);
lv.setAdapter(disadpt);
mCursor.close();
db.close();
}
}
And in the ActivityTwo, I have in a button click:
db.execSQL("insert into clients (idclient, nameclient,typeclient,...");
DisplayClientiAdapter da = new DisplayClientiAdapter(getApplicationContext());
da.notifyDataSetChanged();
finish();
Also the displayAdapter is something like:
public class DisplayClientiAdapter extends BaseAdapter {
private Context mContext;
private ArrayList<String> idclient;
private ArrayList<String> numeclient;
private ArrayList<String> tipclient;
public DisplayClientiAdapter(Context c){
this.mContext = c;
}
public DisplayClientiAdapter(Context c, ArrayList<String> idclient, ArrayList<String> numeclient, ArrayList<String> tipclient) {
this.mContext = c;
this.idclient = idclient;
this.numeclient = numeclient;
this.tipclient = tipclient;
}
public int getCount() {
return idclient.size();
}
public Object getItem(int position) {
return null;
}
public long getItemId(int position) {
return 0;
}
public View getView(int pos, View child, ViewGroup parent) {
Holder mHolder;
LayoutInflater layoutInflater;
if (child == null) {
layoutInflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
child = layoutInflater.inflate(R.layout.clienti_item, null);
mHolder = new Holder();
mHolder.txt_idclient = (TextView) child.findViewById(R.id.tv_cl_id);
mHolder.txt_numeclient = (TextView) child.findViewById(R.id.tv_cl_nume);
mHolder.txt_tipclient = (TextView) child.findViewById(R.id.tv_cl_tip);
child.setTag(mHolder);
} else {
mHolder = (Holder) child.getTag();
}
mHolder.txt_idclient.setText(idclient.get(pos));
mHolder.txt_numeclient.setText(numeclient.get(pos));
mHolder.txt_tipclient.setText(tipclient.get(pos));
return child;
}
public class Holder {
TextView txt_idclient;
TextView txt_numeclient;
TextView txt_tipclient;
}
Of course it does not work like this. The list is not refreshed... I assume it has to do with the displayAdapter !?!?!
I cannot call the LoadList method since it is static or something like that...
Please help.
Thank you

Its not a problem with your adapter. You have to call Loadlist() in onresume method instead of oncreate method in ActivityOne. It will work then.

First of all, have a look at this two articles:
http://www.doubleencore.com/2013/05/layout-inflation-as-intended/
http://www.doubleencore.com/2013/06/context/
You shouldn't inflate your views with null in your inflate method if you have parent view available.
Also, using application context for inflating may cause strange behaviour, as it may not use correct theme you may've set in app manifest for your Activity.
On the other hand - why don't you use CursorAdapter instead of BaseAdapter?
The problem with your adapter is, that you don't set the data in it! :)
///EDIT:
I checked the wrong activity - why do you create second adapter in there?
The easiest solution would be to move the LoadList() to onStart.
If you want to do it right, you should use ContentObserver and (probably) CursorAdapter.

refresh listview after data has changed from custom adapter

I have seen several posts on this but I cannot seem to follow one well enough to fix my problem.
I am trying to refresh my ListView after I update or delete a record. I am currently using notifyDataSetChanged() however it does not refresh upon deletion. I can delete, and then if i back our and reload my history.java it will show the updates because I am reloading all of the data.
here is my HistoryAdapter.java
public class HistoryAdapter extends BaseAdapter {
private Context mContext;
Cursor cursor;
history historyClass = new history();
MySQLiteHelper db;
public HistoryAdapter(Context context, Cursor cur){
super();
mContext = context;
cursor = cur;
db = new MySQLiteHelper(context);
}
public int getCount(){
// return the number of records in cursor
return cursor.getCount();
}
// getView method is called for each item of ListView
public View getView(final int position, View view, ViewGroup parent){
// inflate the layout for each item of listView
LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(R.layout.history_list_item, null);
// move the cursor to required position
cursor.moveToPosition(position);
final String id = cursor.getString(cursor.getColumnIndex("_id"));
final long deleteId = Long.parseLong(id);
// fetch the information for each card
String pricePerGallon = cursor.getString(cursor.getColumnIndex("pricePerGallon"));
String gallons = cursor.getString(cursor.getColumnIndex("gallons"));
String odometer = cursor.getString(cursor.getColumnIndex("odometer"));
String date = cursor.getString(cursor.getColumnIndex("date"));
String filledOrNot = cursor.getString(cursor.getColumnIndex("filledOrNot"));
String comments = cursor.getString(cursor.getColumnIndex("comments"));
//String milesPerGallon = cursor.getString(cursor.getColumnIndex("miledPerGallon"));
String totalSpent = cursor.getString(cursor.getColumnIndex("totalSpent"));
// get the reference of TextViews
TextView textViewPricePerGallon = (TextView) view.findViewById(R.id.cardPrice);
TextView textViewGallons = (TextView) view.findViewById(R.id.cardGallons);
TextView textViewOdometer = (TextView) view.findViewById(R.id.cardOdometer);
TextView textViewDate = (TextView) view.findViewById(R.id.cardDate);
TextView textViewFilledOrNot = (TextView) view.findViewById(R.id.cardFilledOrNot);
TextView textViewComments = (TextView) view.findViewById(R.id.cardComments);
//TextView textViewMilesPerGallon = (TextView) view.findViewById(R.id.mpg);
TextView textViewTotalSpent = (TextView) view.findViewById(R.id.usd);
TextView textViewDeleteButton = (TextView) view.findViewById(R.id.deleteButton);
// Set the data to each TextView
textViewPricePerGallon.setText(pricePerGallon);
textViewGallons.setText(gallons);
textViewOdometer.setText(odometer);
textViewDate.setText(date);
textViewFilledOrNot.setText(filledOrNot);
textViewComments.setText(comments);
//textViewMilesPerGallon.setText(milesPerGallon);
textViewTotalSpent.setText(totalSpent);
final HistoryAdapter historyAdapter = this;
textViewDeleteButton.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Log.d("History Adapter", "" + deleteId);
//need to delete here
deleteRecord(deleteId);
historyAdapter.notifyDataSetChanged();
}
});
return view;
}
public Object getItem(int position){
return position;
}
public long getItemId(int position){
return position;
}
private void deleteRecord(long id){
db.deleteGasLog(id);
}
}
here is my history.java which sets the adapter and creates the listview
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.history);
context = this;
initViews();
cursor = db.getAllLogs();
// Create the Adapter
historyAdapter = new HistoryAdapter(this, cursor);
// Set the adapter to ListView
listContent.setAdapter(historyAdapter);
}

I guess you will need to get a new cursor.
Try moving this
cursor = db.getAllLogs();
into the adapter and call it again before the notifyDataSetChanged() call.

You are deleting the row but you are never updating or getting a new cursor, which has the result set the adapter uses to layout the list. You need to give the adapter a new cursor after you delete a row, then call notifyDatasetChanged(). If you use SimpleCursorAdapter
instead of BaseAdapter, you can use its swapCursor() method to set the new cursor.

Make sure to call:
registerDataSetObserver(...)
from your BaseAdapter subclass.
Pass it the reference to your DataSetObserver implementation. Possibly through an inner class of HistoryAdapter:
public class HistoryAdapter extends BaseAdapter {
. . .
public class MyDataSetObserver extends DataSetObserver {
public void onChanged() {
// Data Set changed.... do something...
}
public void onValidated() {
// Your implementation here
}
}
. . .
public HistoryAdapter(Context context, Cursor cur) {
. . .
registerDataSetObserver(new MyDataSetObserver());
. . .
}
}
HTH

Using Intent with actions

Right. I have an action that needs to call another activity. As I understand this, I need to use Intents to do so if I want to parse values to this activity.
However, my code fails and im a little lost as to why.
My main activity:
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.main);
final ArrayList<menuItem> AMI = new ArrayList<menuItem>();
/*Menu item: String name, String menu ID*/
/*ToDo: Logic to fecth new menu structure from server*/
menuItem MI1 = new menuItem("menu item 1","1");
menuItem MI2 = new menuItem("menu item 2","2");
AMI.add(MI1);
AMI.add(MI2);
GridView gridview = (GridView) findViewById(R.id.GridView01);
gridview.setAdapter(new menuAdapter(this, AMI));
gridview.setOnItemClickListener(new OnItemClickListener()
{
public void onItemClick(AdapterView<?> parent, View v, int position, long id)
{
//Toast.makeText(Runner.this, AMI.get(position).getMenuID(), Toast.LENGTH_SHORT).show();
Intent myIntent = new Intent(v.getContext(), showMenu.class);
myIntent.putExtra("parentID", AMI.get(position).getMenuID());
startActivityForResult(myIntent, 0);
}
});
The "Toast" works just fine, however when I call the showMenu class it crashes.
The showMenu class looks as follows:
public class showMenu extends Activity{
public String menuParent = "";
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.submenu);
Bundle extras = getIntent().getExtras();
if(extras !=null)
{
menuParent = extras.getString("parentID");
}
/*ToDo: Logic to fecth new menu structure from server*/
final ArrayList<menuItem> AMI = new ArrayList<menuItem>();
menuItem MI1 = new menuItem("submenu 1","1");
menuItem MI2 = new menuItem("submenu 2","2");
AMI.add(MI1);
AMI.add(MI2);
GridView gridview = (GridView) findViewById(R.id.GridView01);
gridview.setAdapter(new subMenuAdapter(this, AMI));
}
public class subMenuAdapter extends BaseAdapter {
private ArrayList<menuItem> MIL = new ArrayList<menuItem>();
public static final int ACTIVITY_CREATE = 10;
public subMenuAdapter(Context c, ArrayList<menuItem> AMI) {
MIL = AMI;
}
public int getCount() {
return MIL.size();
}
public Object getItem(int position) {
return null;
}
public long getItemId(int position) {
return 0;
}
public View getView(int position, View convertView, ViewGroup parent) {
View v;
if (convertView == null) {
LayoutInflater li = getLayoutInflater();
v = (LinearLayout) li.inflate(R.layout.grid_item, null);
TextView tv = (TextView)v.findViewById(R.id.grid_text);
tv.setText(MIL.get(position).getMenuname());
} else {
v = convertView;
}
return v;
}
}
}
Any idea why it crashes?

I think you have to register your Intent in your AndroidManifest.xml
<activity
android:name="Package.Name.showMenu"
android:theme="#android:style/Theme.Light"></activity>

As both activities are from same application, there are some other ways as well to pass data between instead of intents. check the link below:
http://developer.android.com/resources/faq/framework.html#3
If you want to use only intents, can you please specify the error you are facing, so that someone can reply you correctly.

if you want to parse values to another activity,you must use startActivityForResult.This is called sub_activity.