13 Use content providers and permissions by implementing read
phonebook contacts with content providers and display in the list.
res->layout->activity_contact_display.xml
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<ListView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/listView"
></ListView>
</RelativeLayout>
ContactDisplay.java
package com.example.contactdisplay;
import android.os.Bundle;
import android.provider.Contacts.People;
import android.provider.ContactsContract;
import android.provider.ContactsContract.CommonDataKinds.Phone;
import android.provider.ContactsContract.PhoneLookup;
import android.app.Activity;
import android.database.Cursor;
import android.view.Menu;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;
public class ContactDisplay extends Activity {
ListView list = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_contact_display);
list=(ListView)findViewById(R.id.listView);
Cursor people =
getContentResolver().query(ContactsContract.Contacts.CONTENT_URI, null,
null,
null, null);
Cursor cursor = getContentResolver().query(Phone.CONTENT_URI, null,
null,null, null);
String contact = "Name
Number"+"\n";
while(people.moveToNext() && cursor.moveToNext()) {
int nameFieldColumnIndex =
people.getColumnIndex(PhoneLookup.DISPLAY_NAME);
contact = contact + people.getString(nameFieldColumnIndex);
contact = contact+" --- " +
cursor.getString(cursor.getColumnIndex(Phone.NUMBER))+"\n";
}
String final_array[] = contact.split("\n");
ArrayAdapter<String> array = new
ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,final_array);
list.setAdapter(array);
}
}
14 Create an application to call a phone number entered by the user
the Edit Text.
strings.xml
<resources>
<string name="app_name">CallingDemo</string>
<string name="hello_world">Hello world!</string>
<string name="menu_settings">Settings</string>
<string name="title_activity_calling_demo">CallingDemo</string>
<string name="lblNum">Enter Mobile Number</string>
<string name="call">CALL</string>
</resources>
res->layout->activity_calling_demo.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="@string/lblNum"
/>
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/txt"
android:inputType="number"
/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/btn"
android:text="@string/call"
/>
</LinearLayout>
CallingDemo.java
package com.example.callingdemo;
import android.net.Uri; import
android.os.Bundle; import
android.app.Activity; import
android.content.Intent; import
android.view.View; import
android.widget.Button;
public class CallingDemo extends Activity implements View.OnClickListener{
Button btn = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_calling_demo);
btn = (Button)findViewById(R.id.btn);
btn.setOnClickListener(this);
}
public void onClick(View v) {
Intent callIntent = new Intent(Intent.ACTION_CALL);
callIntent.setData(Uri.parse("tel:0377778888"));
startActivity(callIntent);
}
}
15 Create an application that will create database to store username
and password.
res->layout-> activity_database_demo.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" >
</RelativeLayout>
DatabaseDemo.java
package com.example.database12exercise;
import android.os.Bundle;
import android.widget.Toast;
import android.app.Activity;
import android.database.sqlite.SQLiteDatabase;
public class DatabaseDemo extends Activity {
SQLHelper helper = null;
SQLiteDatabase database = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_database_demo);
helper = new SQLHelper(this);
database = helper.getWritableDatabase();
String userName = "abc";
String password = "123";
String query = "insert into user_login
values('"+userName+"','"+password+"');";
database.execSQL(query);
Toast.makeText(this,"Record Insert Successfully...!!!",
Toast.LENGTH_LONG).show();
}
}
SQLHelper.java
package com.example.database12exercise;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
public class SQLHelper extends SQLiteOpenHelper
static final String DATABASE_NAME = "login.db";
static final int DATABASE_VERSION = 1;
public SQLHelper(Context context) {
super(context,DATABASE_NAME,null,DATABASE_VERSION);
}
public void onCreate(SQLiteDatabase db) {
String query = "create table user_login(usernme varchar(20), password
varchar(30))";
db.execSQL(query);
}
public void onUpgrade(SQLiteDatabase arg0, int arg1, int arg2) {
}
}
16 Create an application to insert, update and delete a record from the
database.
res->values->strings.xml
<resources>
<string name="app_name">SQLHelperDemo</string>
<string name="hello_world">Hello world!</string>
<string name="menu_settings">Settings</string>
<string name="title_activity_main">MainActivity</string>
<string name="enter_no">Enter Number</string>
<string name="enter_name">Enter Name</string>
<string name="btn_add">ADD</string>
<string name="btn_delete">DELETE</string>
<string name="update">UPDATE</string>
<string name="btn_clear">CLEAR ALL RECORDS</string>
<string name="btnUpdate">UPDATE</string>
</resources>
res->layout->activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="@string/enter_no"
/>
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/txtNum"
android:inputType="number"
/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="@string/enter_name"
/>
<EditText
android:layout_width="match_parent”
android:layout_height="wrap_content"
android:id="@+id/txtName"
android:inputType="text"
/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/btnAdd"
android:text="@string/btn_add"
/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/btnDelete"
android:text="@string/btn_delete"
/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/btnUpdate"
android:text="@string/btnUpdate"
/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/btnClr"
android:text="@string/btn_clear"
/>
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/showRecord"
android:inputType="textMultiLine"
android:lines="10"
/>
</LinearLayout>
SQLHelper.java
package com.example.sqlhelperdemo;
mport android.content.Context;
mport android.database.sqlite.SQLiteDatabase;
mport android.database.sqlite.SQLiteOpenHelper;
public class SQLHelper extends SQLiteOpenHelper
static final String DATABASE_NAME = "student.db";
static final int DATABASE_VERSION = 1;
public SQLHelper(Context context) {
super(context,DATABASE_NAME,null,DATABASE_VERSION);
}
public void onCreate(SQLiteDatabase db) {
String query = "create table std_info(no integer(5), name varchar(30))";
db.execSQL(query);
}
public void onUpgrade(SQLiteDatabase arg0, int arg1, int arg2) {
}
}
MainActivity.java
package com.example.sqlhelperdemo;
import android.os.Bundle;
import android.view.View; import
android.widget.Button; import
android.widget.EditText; import
android.widget.Toast; import
android.app.Activity; import
android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
public class MainActivity extends Activity implements View.OnClickListener{
SQLHelper helper = null;
SQLiteDatabase database = null;
String final_str = null;
Cursor c = null;
Button btnAdd = null;
Button btnDelete = null;
Button btnUpdate = null;
Button btnClear = null;
EditText txtNo = null;
EditText txtName = null;
EditText txtShow = null;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main)
btnAdd = (Button)findViewById(R.id.btnAdd);
btnDelete = (Button)findViewById(R.id.btnDelete);
btnUpdate = (Button)findViewById(R.id.btnUpdate);
btnClear = (Button)findViewById(R.id.btnClr);
btnAdd.setOnClickListener(this);
btnDelete.setOnClickListener(this);
btnUpdate.setOnClickListener(this);
btnClear.setOnClickListener(this);
txtNo = (EditText)findViewById(R.id.txtNum);
txtName = (EditText)findViewById(R.id.txtName);
txtShow = (EditText)findViewById(R.id.showRecord);
helper = new SQLHelper(this);
database = helper.getWritableDatabase();
}
public void onClick(View v) {
if(v.getId()==R.id.btnAdd){
addRecord();
clearFields();
showRecord();
}else if(v.getId()==R.id.btnDelete){
deleteRecord();
clearFields();
showRecord();
}else if(v.getId()==R.id.btnUpdate){
updateRecord();
clearFields();
showRecord();
}else if(v.getId()==R.id.btnClr){
clearAllRecord();
txtShow.setText("");
}
}
////////////// function for add records //////////////////
public void addRecord(){
String no = txtNo.getText().toString();
String name = txtName.getText().toString();
int number = Integer.parseInt(no);
String query = "insert into std_info values("+number+",'"+name+"');";
database.execSQL(query);
Toast.makeText(this,"Record Insert Successfully...!!!", Toast.LENGTH_LONG).show()
}
////////////// function for delete records //////////////////
public void deleteRecord(){
String no = txtNo.getText().toString();
int number = Integer.parseInt(no);
database.execSQL("delete from std_info where no = "+number);
Toast.makeText(this,"Record Delete Successfully...!!!", Toast.LENGTH_LONG).show();
}
////////////// function for update records //////////////////
public void updateRecord(){
String no = txtNo.getText().toString();
int number = Integer.parseInt(no);
String name = txtName.getText().toString();
database.execSQL("update std_info set name='"+name+"' where no = "+number);
Toast.makeText(this,"Record Update Successfully...!!!", Toast.LENGTH_LONG). show();
}
////////////// function for show records in text area //////////
public void showRecord(){
final_str = "NUMBER
NAME \n";
c = database.rawQuery("select * from std_info",null);
if(c!=null){
int no_index = c.getColumnIndex("no");
int name_index = c.getColumnIndex("name");
c.moveToFirst();
String std_no;
String std_name;
do{
std_no = c.getString(no_index);
std_name = c.getString(name_index);
final_str = final_str + std_no + "
"+std_name+"\n";
}while(c.moveToNext());
}
txtShow.setText(final_str);
}
////////////// function for clear all records //////////////////
public void clearAllRecord(){
database.execSQL("delete from std_info");
Toast.makeText(this,"All Records Are Clear...!!!", Toast.LENGTH_LONG).show();
}
////////////// function for clear fields //////////////////
public void clearFields(){
txtNo.setText("");
txtName.setText("");
}
}