Yeah so basically I set out to make an android app that saves and displays contacts on the phone using SQLite and everything. I am a total newbie at this and have had no formal training in Android Application Developemnt. The contact manager app is a part of a bigger app idea that has been brewing in my mind. The basic thing that I want to create first is a feature to save contacts and view them in same fragment activity using the side-scrolling pager. The thing is, the pager worked fine until I put some code to save and display contacts in the FragmentActivities. When I used test Fragment Activities, everything worked fine and smoothly. Please have a look at the Following code try to tell me what's wring with my code. Also, I am using an actual phone to run the apps (Nokia X), so tell me if that could be a factor too?
package com.example.nikhil.test1;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
/**
* Created by nikhil on 22-10-2015.
*/
public class ContactEdit extends Fragment {
MyDatabaseHelper databaseHelper = new MyDatabaseHelper(this.getActivity());
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
ViewGroup rootView = (ViewGroup) inflater.inflate(
R.layout.fragment_contact_edit, container, false);
Button SaveBTN = (Button) getActivity().findViewById(R.id.BtnSave);
SaveBTN.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
EditText _Name = (EditText) getView().findViewById(R.id.textName);
EditText _Mobile = (EditText) getView().findViewById(R.id.textMobile);
EditText _Home = (EditText) getView().findViewById(R.id.textHome);
EditText _Address = (EditText) getView().findViewById(R.id.textAddress);
String name = _Name.getText().toString();
String mobile = _Mobile.getText().toString();
String home = _Home.getText().toString();
String address = _Address.getText().toString();
databaseHelper.addFriend(name, address, mobile, home);
}
});
return rootView;
}
}
package com.example.nikhil.test1;
import android.app.LoaderManager;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.widget.SimpleCursorAdapter;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.support.v4.app.LoaderManager.LoaderCallbacks;
import android.support.v4.content.CursorLoader;
import android.support.v4.content.Loader;
public class ContactList extends Fragment implements LoaderCallbacks<Cursor> {
SimpleCursorAdapter adapter;
private LoaderManager supportLoaderManager;
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
ViewGroup rootView = (ViewGroup) inflater.inflate(
R.layout.contact_row, container, false);
MyDatabaseHelper dbHelper = new MyDatabaseHelper(this.getActivity());
final Cursor cursor = dbHelper.getAllFriends();
String [] from = new String[] {"name","phonenumber"};
int[] to = { R.id.name, R.id.phonenumber};
ListAdapter adapter=new SimpleCursorAdapter(this.getActivity(),android.R.layout.simple_list_item_2, cursor, from, to);
ListView myList=(ListView) getView().findViewById(R.id.list);
myList.setAdapter(adapter);
//setListAdapter(new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_1));
return rootView;
}
@Override
public Loader<Cursor> onCreateLoader(int arg0, Bundle arg1) {
Uri uri = Contacts.CONTENT_URI;
return new CursorLoader(this.getActivity(), uri, null, null, null, null);
}
public void onLoadFinished(Loader<Cursor> arg0, Cursor arg1) {
adapter.swapCursor(arg1);
}
public void onLoaderReset(Loader<Cursor> arg0) {
adapter.swapCursor(null);
}
}
import android.content.ContentProvider;
import android.content.ContentValues;
import android.content.UriMatcher;
import android.database.Cursor;
import android.net.Uri;
public class Contacts extends ContentProvider {
public static final String PROVIDER_NAME = "com.example.nikhil.test1.Contacts";
public static final Uri CONTENT_URI = Uri.parse("content://" + PROVIDER_NAME + "/contacts" );
private static final int Contacts = 1;
private static final UriMatcher uriMatcher ;
static {
uriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
uriMatcher.addURI(PROVIDER_NAME, "contacts", Contacts);
}
MyDatabaseHelper mMyDataBaseHelper;
@Override
public boolean onCreate() {
mMyDataBaseHelper = new MyDatabaseHelper(getContext());
return true;
}
@Override
public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) {
return null;
}
@Override
public String getType(Uri uri) {
return null;
}
@Override
public Uri insert(Uri uri, ContentValues values) {
if(uriMatcher.match(uri)==Contacts){
return (Uri) mMyDataBaseHelper.getAllFriends();
}else{
return null;
}
}
@Override
public int delete(Uri uri, String selection, String[] selectionArgs) {
return 0;
}
@Override
public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
return 0;
}
}
I have only given the relevant codes. Also here is my Android Manifest
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.nikhil.test1" >
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".FirstSplashScreen"
android:label="@string/title_activity_first_splash_screen" >
<intent-filter>
<action android:name="com.example.nikhil.test1.FirstSplashScreen" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<provider
android:name=".Contacts"
android:authorities="com.example.nikhil.test1.Contacts"
android:exported="false" />
</application>
</manifest>
