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Content Provider Example(View Contacts,Add Contacts,Delete Contacts,Update Contacts)

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This is the example of content provider.This example shows how to view ,add,modify and delete contacts.

ContentProvider_Demo.java


import java.util.ArrayList;

import android.app.Activity;

import android.content.ContentProviderOperation;

import android.content.ContentResolver;

import android.content.OperationApplicationException;

import android.database.Cursor;



import android.os.Bundle;

import android.os.RemoteException;

import android.provider.ContactsContract;



import android.util.Log;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.Toast;



public class ContentProvider_Demo extends Activity {





/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);



Button view = (Button)findViewById(R.id.viewButton);

Button add = (Button)findViewById(R.id.createButton);

Button modify = (Button)findViewById(R.id.updateButton);

Button delete = (Button)findViewById(R.id.deleteButton);





view.setOnClickListener(new OnClickListener() {

public void onClick(View v){

displayContacts();

Log.i("NativeContentProvider", "Completed Displaying Contact list");

}

});



add.setOnClickListener(new OnClickListener() {

public void onClick(View v){

createContact("Example Name", "123456789");

Log.i("NativeContentProvider", "Created a new contact, of course hard-coded");

}

});



modify.setOnClickListener(new OnClickListener() {

public void onClick(View v) {

updateContact("Example Name", "987604321");

Log.i("NativeContentProvider", "Completed updating the email id, if applicable");

}

});



delete.setOnClickListener(new OnClickListener() {

public void onClick(View v) {

deleteContact("Example Name");

Log.i("NativeContentProvider", "Deleted the just created contact");

}

});

}



private void displayContacts() {



ContentResolver cr = getContentResolver();

Cursor cur = cr.query(ContactsContract.Contacts.CONTENT_URI,

null, null, null, null);

if (cur.getCount() > 0) {

while (cur.moveToNext()) {

String id = cur.getString(cur.getColumnIndex(ContactsContract.Contacts._ID));

String name = cur.getString(cur.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));

if (Integer.parseInt(cur.getString(

cur.getColumnIndex(ContactsContract.Contacts.HAS_PHONE_NUMBER))) > 0) {

Cursor pCur = cr.query(

ContactsContract.CommonDataKinds.Phone.CONTENT_URI,

null,

ContactsContract.CommonDataKinds.Phone.CONTACT_ID +" = ?",

new String[]{id}, null);

while (pCur.moveToNext()) {

String phoneNo = pCur.getString(pCur.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));

Toast.makeText(ContentProvider_Demo.this, "Name: " + name + ", Phone No: " + phoneNo, Toast.LENGTH_SHORT).show();

}

pCur.close();

}

}

}

}



private void createContact(String name, String phone) {

ContentResolver cr = getContentResolver();



Cursor cur = cr.query(ContactsContract.Contacts.CONTENT_URI,

null, null, null, null);



if (cur.getCount() > 0) {

while (cur.moveToNext()) {

String existName = cur.getString(cur.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));

if (existName.contains(name)) {

Toast.makeText(ContentProvider_Demo.this,"The contact name: " + name + " already exists", Toast.LENGTH_SHORT).show();

return;

}

}

}



ArrayList<ContentProviderOperation> ops = new ArrayList<ContentProviderOperation>();

ops.add(ContentProviderOperation.newInsert(ContactsContract.RawContacts.CONTENT_URI)

.withValue(ContactsContract.RawContacts.ACCOUNT_TYPE, "accountname@gmail.com")

.withValue(ContactsContract.RawContacts.ACCOUNT_NAME, "com.google")

.build());

ops.add(ContentProviderOperation.newInsert(ContactsContract.Data.CONTENT_URI)

.withValueBackReference(ContactsContract.Data.RAW_CONTACT_ID, 0)

.withValue(ContactsContract.Data.MIMETYPE,

ContactsContract.CommonDataKinds.StructuredName.CONTENT_ITEM_TYPE)

.withValue(ContactsContract.CommonDataKinds.StructuredName.DISPLAY_NAME, name)

.build());

ops.add(ContentProviderOperation.newInsert(ContactsContract.Data.CONTENT_URI)

.withValueBackReference(ContactsContract.Data.RAW_CONTACT_ID, 0)

.withValue(ContactsContract.Data.MIMETYPE,

ContactsContract.CommonDataKinds.Phone.CONTENT_ITEM_TYPE)

.withValue(ContactsContract.CommonDataKinds.Phone.NUMBER, phone)

.withValue(ContactsContract.CommonDataKinds.Phone.TYPE, ContactsContract.CommonDataKinds.Phone.TYPE_HOME)

.build());





try {

cr.applyBatch(ContactsContract.AUTHORITY, ops);

} catch (RemoteException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (OperationApplicationException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}



Toast.makeText(ContentProvider_Demo.this, "Created a new contact with name: " + name + " and Phone No: " + phone, Toast.LENGTH_SHORT).show();



}



private void updateContact(String name, String phone) {

ContentResolver cr = getContentResolver();



String where = ContactsContract.Data.DISPLAY_NAME + " = ? AND " +

ContactsContract.Data.MIMETYPE + " = ? AND " +

String.valueOf(ContactsContract.CommonDataKinds.Phone.TYPE) + " = ? ";

String[] params = new String[] {name,

ContactsContract.CommonDataKinds.Phone.CONTENT_ITEM_TYPE,

String.valueOf(ContactsContract.CommonDataKinds.Phone.TYPE_HOME)};



Cursor phoneCur = managedQuery(ContactsContract.Data.CONTENT_URI, null, where, params, null);



ArrayList<ContentProviderOperation> ops = new ArrayList<ContentProviderOperation>();



if ( (null == phoneCur) ) {

createContact(name, phone);

} else {

ops.add(ContentProviderOperation.newUpdate(ContactsContract.Data.CONTENT_URI)

.withSelection(where, params)

.withValue(ContactsContract.CommonDataKinds.Phone.DATA, phone)

.build());

}



phoneCur.close();



try {

cr.applyBatch(ContactsContract.AUTHORITY, ops);

} catch (RemoteException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (OperationApplicationException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}



Toast.makeText(ContentProvider_Demo.this, "Updated the phone number of 'Example Name' to: " + phone, Toast.LENGTH_SHORT).show();

}



private void deleteContact(String name) {



ContentResolver cr = getContentResolver();

String where = ContactsContract.Data.DISPLAY_NAME + " = ? ";

String[] params = new String[] {name};



ArrayList<ContentProviderOperation> ops = new ArrayList<ContentProviderOperation>();

ops.add(ContentProviderOperation.newDelete(ContactsContract.RawContacts.CONTENT_URI)

.withSelection(where, params)

.build());

try {

cr.applyBatch(ContactsContract.AUTHORITY, ops);

} catch (RemoteException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (OperationApplicationException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}



Toast.makeText(ContentProvider_Demo.this, "Deleted the contact with name '" + name +"'", Toast.LENGTH_SHORT).show();



}

}

main.xml

　

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:orientation="vertical"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

>

<TextView

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="@string/hello"

/>

<Button

android:text="@string/viewButton"

android:id="@+id/viewButton"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_gravity="center_horizontal">

</Button>

<Button

android:text="@string/createButton"

android:id="@+id/createButton"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_gravity="center_horizontal">

</Button>

<Button

android:text="@string/updateButton"

android:id="@+id/updateButton"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_gravity="center_horizontal">

</Button>

<Button

android:text="@string/deleteButton"

android:id="@+id/deleteButton"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_gravity="center_horizontal">

</Button>

</LinearLayout>

string.xml

<?xml version="1.0" encoding="utf-8"?>

<resources>

<string name="hello"> Here is the contacts list</string>

<string name="app_name">ContentProvider_Demo</string>

<string name="viewButton">View Contacts</string>

<string name="createButton">Add Contact</string>

<string name="updateButton">Modify Contact</string>

<string name="deleteButton">Delete Contact</string>

</resources>

manifest.xml

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

android:versionCode="1"

android:versionName="1.0" package="com.example.ContentProvider_Demo">

<application android:icon="@drawable/icon" android:label="@string/app_name">

<activity android:name="com.example.contentprovidernewexample.ContentProvider_Demo"

android:label="@string/app_name">

<intent-filter>

<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />

</intent-filter>

</activity>

</application>

<uses-sdk android:minSdkVersion="8" />

<uses-permission android:name="android.permission.READ_CONTACTS"></uses-permission>

<uses-permission android:name="android.permission.WRITE_CONTACTS"></uses-permission>

</manifest>

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