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POInsert JSON data into the SQLite database in android
 

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  1. POInsert JSON data into the SQLite database in android
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    <p>I want to insert the data from JSON array into the SQLite database. I have created two classes CategoryHelper.java and AndroidJSONParsingActivity.java to get the java response. When I run the code got the exception in <code>databaseHelper.saveCategoryRecord(id,name);</code> My API is working fine and giving me the data.</p> <p>My code is below:</p> <p>CategoryHelper.java </p> <pre><code>package com.androidhive.jsonparsing; import android.content.ContentValues; import android.content.Context; import android.database.Cursor; import android.database.sqlite.SQLiteDatabase; import android.database.sqlite.SQLiteOpenHelper; public class CategoryHelper { private static final int DATABASE_VERSION = 2; private static final String DATABASE_NAME = "category.db"; private static final String TABLE_NAME = "tbcategory"; public static final String CATEGORY_COLUMN_ID = "_id"; public static final String CATEGORY_COLUMN_NAME = "name"; Category openHelper; private SQLiteDatabase database; public CategoryHelper(Context context){ openHelper = new Category(context); database = openHelper.getWritableDatabase(); } public void saveCategoryRecord(String id, String name) { ContentValues contentValues = new ContentValues(); contentValues.put(CATEGORY_COLUMN_ID, id); contentValues.put(CATEGORY_COLUMN_NAME, name); database.insert(TABLE_NAME, null, contentValues); } public Cursor getTimeRecordList() { return database.rawQuery("select * from " + TABLE_NAME, null); } private class Category extends SQLiteOpenHelper { public Category(Context context) { // TODO Auto-generated constructor stub super(context, DATABASE_NAME, null, DATABASE_VERSION); } @Override public void onCreate(SQLiteDatabase db) { // TODO Auto-generated method stub db.execSQL("CREATE TABLE " + TABLE_NAME + "( " + CATEGORY_COLUMN_ID + " INTEGER PRIMARY KEY, " + CATEGORY_COLUMN_NAME + " TEXT )" ); } @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { // TODO Auto-generated method stub db.execSQL("DROP TABLE IF EXISTS"+ TABLE_NAME); onCreate(db); } } } </code></pre> <p>AndroidJSONParsingActivity.java</p> <pre><code>package com.androidhive.jsonparsing; import java.util.ArrayList; import java.util.HashMap; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; import android.app.ListActivity; import android.content.Intent; import android.database.sqlite.SQLiteDatabase; import android.os.Bundle; import android.util.Log; import android.view.View; import android.widget.AdapterView; import android.widget.AdapterView.OnItemClickListener; import android.widget.ListAdapter; import android.widget.ListView; import android.widget.SimpleAdapter; import android.widget.TextView; public class AndroidJSONParsingActivity extends ListActivity { // url to make request private static String url="API TO GET THE DATA"; // JSON Node names private static final String TAG_CATEGORY = "categories"; private static final String TAG_CATEGORY_ID = "category_id"; private static final String TAG_NAME = "name"; private static final String TAG_IS_ACTIVE = "is_active"; // contacts JSONArray JSONArray contacts = null; private CategoryHelper databaseHelper; //private SQLiteDatabase mydatabase = null; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); // Hashmap for ListView ArrayList&lt;HashMap&lt;String, String&gt;&gt; contactList = new ArrayList&lt;HashMap&lt;String, String&gt;&gt;(); // Creating JSON Parser instance JSONParser jParser = new JSONParser(); // getting JSON string from URL JSONObject json = jParser.getJSONFromUrl(url); try { // Getting Array of Contacts contacts = json.getJSONArray(TAG_CATEGORY); // looping through All Contacts for(int i = 0; i &lt; contacts.length(); i++){ JSONObject c = contacts.getJSONObject(i); // Storing each json item in variable String id = c.getString(TAG_CATEGORY_ID); String name = c.getString(TAG_NAME); String is_active = c.getString(TAG_IS_ACTIVE); databaseHelper.saveCategoryRecord(id,name); // creating new HashMap HashMap&lt;String, String&gt; map = new HashMap&lt;String, String&gt;(); // adding each child node to HashMap key =&gt; value map.put(TAG_CATEGORY_ID, id); map.put(TAG_NAME, name); map.put(TAG_IS_ACTIVE, is_active); // adding HashList to ArrayList contactList.add(map); } } catch (JSONException e) { e.printStackTrace(); } /** * Updating parsed JSON data into ListView * */ ListAdapter adapter = new SimpleAdapter(this, contactList, R.layout.list_item, new String[] { TAG_NAME, TAG_IS_ACTIVE, TAG_CATEGORY_ID }, new int[] { R.id.name, R.id.email, R.id.mobile }); setListAdapter(adapter); // selecting single ListView item ListView lv = getListView(); // Launching new screen on Selecting Single ListItem lv.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView&lt;?&gt; parent, View view, int position, long id) { // getting values from selected ListItem String name = ((TextView) view.findViewById(R.id.name)).getText().toString(); String cost = ((TextView) view.findViewById(R.id.email)).getText().toString(); String description = ((TextView) view.findViewById(R.id.mobile)).getText().toString(); // Starting new intent Intent in = new Intent(getApplicationContext(), SingleMenuItemActivity.class); in.putExtra(TAG_NAME, name); in.putExtra(TAG_IS_ACTIVE, cost); in.putExtra(TAG_CATEGORY_ID, description); startActivity(in); } }); } } </code></pre> <p>LOGCAT:</p> <pre><code>01-21 20:13:49.226: E/AndroidRuntime(301): FATAL EXCEPTION: main 01-21 20:13:49.226: E/AndroidRuntime(301): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.androidhive.jsonparsing/com.androidhive.jsonparsing.AndroidJSONParsingActivity}: java.lang.NullPointerException 01-21 20:13:49.226: E/AndroidRuntime(301): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663) 01-21 20:13:49.226: E/AndroidRuntime(301): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679) 01-21 20:13:49.226: E/AndroidRuntime(301): at android.app.ActivityThread.access$2300(ActivityThread.java:125) 01-21 20:13:49.226: E/AndroidRuntime(301): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033) 01-21 20:13:49.226: E/AndroidRuntime(301): at android.os.Handler.dispatchMessage(Handler.java:99) 01-21 20:13:49.226: E/AndroidRuntime(301): at android.os.Looper.loop(Looper.java:123) 01-21 20:13:49.226: E/AndroidRuntime(301): at android.app.ActivityThread.main(ActivityThread.java:4627) 01-21 20:13:49.226: E/AndroidRuntime(301): at java.lang.reflect.Method.invokeNative(Native Method) 01-21 20:13:49.226: E/AndroidRuntime(301): at java.lang.reflect.Method.invoke(Method.java:521) 01-21 20:13:49.226: E/AndroidRuntime(301): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 01-21 20:13:49.226: E/AndroidRuntime(301): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 01-21 20:13:49.226: E/AndroidRuntime(301): at dalvik.system.NativeStart.main(Native Method) 01-21 20:13:49.226: E/AndroidRuntime(301): Caused by: java.lang.NullPointerException 01-21 20:13:49.226: E/AndroidRuntime(301): at com.androidhive.jsonparsing.AndroidJSONParsingActivity.onCreate(AndroidJSONParsingActivity.java:65) 01-21 20:13:49.226: E/AndroidRuntime(301): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 01-21 20:13:49.226: E/AndroidRuntime(301): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627) </code></pre> <p>Please guide me how can I insert the JSON array data into the database or where I am doing wrong. Every response is appreciable. </p>
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    1. COshow me your android manifest file.
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      1. USDawid Sajdak
    2. CO@DawidSajdak this is my manifest http://pastebin.com/Tr2ukz45
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    3. COIt's getting a `NullPointerException` while parsing the JSON, so that means that there is a value missing or a null value somewhere in the JSON. I would log each value you are trying to read into logcat so you know more about what's happening, and maybe look at the JSON string you are trying to read from to compare.
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      1. USChad Campbell
 

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