I have made my simple project using SQLite database. As per my code, app should show Database Created when I click on 'create database' but it shows Database Missing. I have checked logcat but I don't get any error over there.
MainActivity
package com.maka.sujan.sqllitedatabase;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import java.io.File;
public class MainActivity extends ActionBarActivity {
SQLiteDatabase contactsDB = null;
Button createDBButton, addContactButton, deleteContactButton, getContactsButton,
deleteDBButton;
EditText nameEditText, emailEditText, contactListEditText, idEditText;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
createDBButton = (Button) findViewById(R.id.createDBButton);
addContactButton = (Button) findViewById(R.id.addContactButton);
deleteContactButton = (Button) findViewById(R.id.deleteContactButton);
getContactsButton = (Button) findViewById(R.id.getContactsButton);
deleteDBButton = (Button) findViewById(R.id.deleteDBButton);
nameEditText = (EditText) findViewById(R.id.nameEditText);
emailEditText = (EditText) findViewById(R.id.emailEditText);
contactListEditText = (EditText) findViewById(R.id.contactListEditText);
idEditText = (EditText) findViewById(R.id.idEditText);
}
public void createDatabase(View view) {
try{
// Opens a current database or creates it
// Pass the database name, designate that only this app can use it
// and a DatabaseErrorHandler in the case of database corruption
contactsDB = this.openOrCreateDatabase("MyContacts", MODE_PRIVATE, null);
// Execute an SQL statement that isn't select
contactsDB.execSQL("CREATE TABLE IF NOT EXISTS contacts " +
"(id integer primary key, name VARCHAR, email VARCHAR);");
// The database on the file system
File database = getApplicationContext().getDatabasePath("MyContacts.db");
// Check if the database exists
if (database.exists()) {
Toast.makeText(this, "Database Created", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(this, "Database Missing", Toast.LENGTH_SHORT).show();
}
}
catch(Exception e){
Log.e("CONTACTS ERROR", "Error Creating Database");
}
// Make buttons clickable since the database was created
addContactButton.setClickable(true);
deleteContactButton.setClickable(true);
getContactsButton.setClickable(true);
deleteDBButton.setClickable(true);
}
public void addContact(View view) {
// Get the contact name and email entered
String contactName = nameEditText.getText().toString();
String contactEmail = emailEditText.getText().toString();
// Execute SQL statement to insert new data
contactsDB.execSQL("INSERT INTO contacts (name, email) VALUES ('" +
contactName + "', '" + contactEmail + "');");
}
public void getContacts(View view) {
// A Cursor provides read and write access to database results
Cursor cursor = contactsDB.rawQuery("SELECT * FROM contacts", null);
// Get the index for the column name provided
int idColumn = cursor.getColumnIndex("id");
int nameColumn = cursor.getColumnIndex("name");
int emailColumn = cursor.getColumnIndex("email");
// Move to the first row of results
cursor.moveToFirst();
String contactList = "";
// Verify that we have results
if(cursor != null && (cursor.getCount() > 0)){
do{
// Get the results and store them in a String
String id = cursor.getString(idColumn);
String name = cursor.getString(nameColumn);
String email = cursor.getString(emailColumn);
contactList = contactList + id + " : " + name + " : " + email + "\n";
// Keep getting results as long as they exist
}while(cursor.moveToNext());
contactListEditText.setText(contactList);
} else {
Toast.makeText(this, "No Results to Show", Toast.LENGTH_SHORT).show();
contactListEditText.setText("");
}
}
public void deleteContact(View view) {
// Get the id to delete
String id = idEditText.getText().toString();
// Delete matching id in database
contactsDB.execSQL("DELETE FROM contacts WHERE id = " + id + ";");
}
public void deleteDatabase(View view) {
// Delete database
this.deleteDatabase("MyContacts");
}
#Override
protected void onDestroy() {
contactsDB.close();
super.onDestroy();
}
}
activity_main
<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" android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:paddingBottom="#dimen/activity_vertical_margin"
tools:context=".MainActivity">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Create Database"
android:id="#+id/createDBButton"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:onClick="createDatabase"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Add Contact"
android:id="#+id/addContactButton"
android:layout_alignParentTop="true"
android:layout_toRightOf="#+id/createDBButton"
android:layout_toEndOf="#+id/createDBButton"
android:layout_marginLeft="10dp"
android:onClick="addContact"
android:clickable="false" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Delete Contact"
android:id="#+id/deleteContactButton"
android:layout_below="#+id/createDBButton"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:onClick="deleteContact"
android:clickable="false"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Get Contacts"
android:id="#+id/getContactsButton"
android:layout_below="#+id/createDBButton"
android:layout_toRightOf="#+id/deleteContactButton"
android:layout_toEndOf="#+id/deleteContactButton"
android:layout_marginLeft="10dp"
android:onClick="getContacts"
android:clickable="false"/>
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/nameEditText"
android:layout_below="#+id/deleteContactButton"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:hint="Name"
android:layout_marginTop="5dp"/>
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/emailEditText"
android:layout_below="#+id/nameEditText"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:hint="Email"
android:layout_marginTop="5dp"
android:inputType="textEmailAddress"/>
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="number"
android:ems="10"
android:id="#+id/idEditText"
android:layout_below="#+id/emailEditText"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:hint="ID to Delete"
android:layout_marginTop="5dp"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Delete Database"
android:id="#+id/deleteDBButton"
android:onClick="deleteDatabase"
android:layout_below="#+id/idEditText"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:clickable="false" />
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="textMultiLine"
android:ems="10"
android:id="#+id/contactListEditText"
android:lines="8"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
</RelativeLayout>
put the extension in the line :
contactsDB = this.openOrCreateDatabase("MyContacts", MODE_PRIVATE, null);
to
contactsDB = this.openOrCreateDatabase("MyContacts.db", MODE_PRIVATE, null);
Your call to openOrCreateDatabase() create a database with the file name MyContacts.
Your call to getDatabasePath() searches for a file with a different name, i.e., MyContacts.db.
Related
I have a form like below image and I want to add a new a contact by click on button add and using ContentProviderOperation for this
How can I do this ? Thanks you so much!!
And this is my onlick method
btnAdd.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
edtName = (EditText) findViewById(R.id.edtName);
edtPhone = (EditText) findViewById(R.id.edtPhone);
edtEmail = (EditText) findViewById(R.id.edtEmail);
}
});
Before adding a contact you have to enable permission into the manifest file.
Android Manifest:
<uses-permission android:name="android.permission.WRITE_CONTACTS" />
after adding permission.I have created one activity for adding contacts.
AddPhoneContactActivity.java file
import android.content.ContentUris;
import android.content.ContentValues;
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.Toast;
import com.test.example.R;
public class AddPhoneContactActivity extends AppCompatActivity {
private EditText displayNameEditor;
private EditText phoneNumberEditor;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_addcontact);
setTitle("dev2qa.com - Android Add Phone Contact Example.");
displayNameEditor = (EditText)findViewById(R.id.add_phone_contact_display_name);
phoneNumberEditor = (EditText)findViewById(R.id.add_phone_contact_number);
// Initialize phone type dropdown spinner.
final Spinner phoneTypeSpinner = (Spinner)findViewById(R.id.add_phone_contact_type);
String phoneTypeArr[] = {"Mobile", "Home", "Work"};
ArrayAdapter<String> phoneTypeSpinnerAdaptor = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, phoneTypeArr);
phoneTypeSpinner.setAdapter(phoneTypeSpinnerAdaptor);
// Click this button to save user input phone contact info.
Button savePhoneContactButton = (Button)findViewById(R.id.add_phone_contact_save_button);
savePhoneContactButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
// Get android phone contact content provider uri.
//Uri addContactsUri = ContactsContract.CommonDataKinds.Phone.CONTENT_URI;
// Below uri can avoid java.lang.UnsupportedOperationException: URI: content://com.android.contacts/data/phones error.
Uri addContactsUri = ContactsContract.Data.CONTENT_URI;
// Add an empty contact and get the generated id.
long rowContactId = getRawContactId();
// Add contact name data.
String displayName = displayNameEditor.getText().toString();
insertContactDisplayName(addContactsUri, rowContactId, displayName);
// Add contact phone data.
String phoneNumber = phoneNumberEditor.getText().toString();
String phoneTypeStr = (String)phoneTypeSpinner.getSelectedItem();
insertContactPhoneNumber(addContactsUri, rowContactId, phoneNumber, phoneTypeStr);
Toast.makeText(getApplicationContext(),"New contact has been added, go back to previous page to see it in contacts list." , Toast.LENGTH_LONG).show();
finish();
}
});
}
// This method will only insert an empty data to RawContacts.CONTENT_URI
// The purpose is to get a system generated raw contact id.
private long getRawContactId()
{
// Inser an empty contact.
ContentValues contentValues = new ContentValues();
Uri rawContactUri = getContentResolver().insert(ContactsContract.RawContacts.CONTENT_URI, contentValues);
// Get the newly created contact raw id.
long ret = ContentUris.parseId(rawContactUri);
return ret;
}
// Insert newly created contact display name.
private void insertContactDisplayName(Uri addContactsUri, long rawContactId, String displayName)
{
ContentValues contentValues = new ContentValues();
contentValues.put(ContactsContract.Data.RAW_CONTACT_ID, rawContactId);
// Each contact must has an mime type to avoid java.lang.IllegalArgumentException: mimetype is required error.
contentValues.put(ContactsContract.Data.MIMETYPE, ContactsContract.CommonDataKinds.StructuredName.CONTENT_ITEM_TYPE);
// Put contact display name value.
contentValues.put(ContactsContract.CommonDataKinds.StructuredName.GIVEN_NAME, displayName);
getContentResolver().insert(addContactsUri, contentValues);
}
private void insertContactPhoneNumber(Uri addContactsUri, long rawContactId, String phoneNumber, String phoneTypeStr)
{
// Create a ContentValues object.
ContentValues contentValues = new ContentValues();
// Each contact must has an id to avoid java.lang.IllegalArgumentException: raw_contact_id is required error.
contentValues.put(ContactsContract.Data.RAW_CONTACT_ID, rawContactId);
// Each contact must has an mime type to avoid java.lang.IllegalArgumentException: mimetype is required error.
contentValues.put(ContactsContract.Data.MIMETYPE, ContactsContract.CommonDataKinds.Phone.CONTENT_ITEM_TYPE);
// Put phone number value.
contentValues.put(ContactsContract.CommonDataKinds.Phone.NUMBER, phoneNumber);
// Calculate phone type by user selection.
int phoneContactType = ContactsContract.CommonDataKinds.Phone.TYPE_HOME;
if("home".equalsIgnoreCase(phoneTypeStr))
{
phoneContactType = ContactsContract.CommonDataKinds.Phone.TYPE_HOME;
}else if("mobile".equalsIgnoreCase(phoneTypeStr))
{
phoneContactType = ContactsContract.CommonDataKinds.Phone.TYPE_MOBILE;
}else if("work".equalsIgnoreCase(phoneTypeStr))
{
phoneContactType = ContactsContract.CommonDataKinds.Phone.TYPE_WORK;
}
// Put phone type value.
contentValues.put(ContactsContract.CommonDataKinds.Phone.TYPE, phoneContactType);
// Insert new contact data into phone contact list.
getContentResolver().insert(addContactsUri, contentValues);
}
// ListPhoneContactsActivity use this method to start this activity.
public static void start(Context context)
{
Intent intent = new Intent(context, AddPhoneContactActivity.class);
context.startActivity(intent);
}
}
activity_addcontact.xml
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:padding="1dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:width="0dp"
android:layout_weight="1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Display Name : "
android:gravity="right"/>
<EditText
android:id="#+id/add_phone_contact_display_name"
android:layout_weight="2"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:width="0dp"
android:layout_weight="1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Phone Number : "
android:gravity="right" />
<EditText
android:id="#+id/add_phone_contact_number"
android:layout_weight="2"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:width="0dp"
android:layout_weight="1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Phone Type : "
android:gravity="right" />
<Spinner
android:id="#+id/add_phone_contact_type"
android:layout_weight="1.3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:spinnerMode="dropdown"/>
</LinearLayout>
<Button
android:id="#+id/add_phone_contact_save_button"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Save Phone Contact"/>
I want to validate the mobile number user enters. I have two edit texts one for the code i.e. +91,0 etc and another for the phone number.
I have a question that how to stop entering the numbers in edit text if more than 10 numbers being entered by the user. Also it should get validated with code and the number.
I tried the validation with this code.
private boolean isValidMobile(String phone)
{
return android.util.Patterns.PHONE.matcher(phone).matches();
}
else if (!isValidMobile(code.getText().toString()+mobileNo.getText().toString()))
{
Toast.makeText(RegisterActivity.this,"Please enter correct Mobile No.",Toast.LENGTH_LONG).show();
}
But it dose not return true for the number. Always returns false i.e. please enter the correct number.
edit texts for number :
<EditText
android:layout_width="30dp"
android:layout_height="match_parent"
android:ems="10"
android:id="#+id/editText_code"
android:layout_marginLeft="20dp"
android:background="#android:color/transparent"
android:hint="+91"
android:textSize="14sp"
android:phoneNumber="true" />
<EditText
android:layout_width="match_parent"
android:layout_height="40dp"
android:hint="MOBILE NO"
android:singleLine="false"
android:layout_below="#+id/linearLayoutFirstName"
android:layout_toRightOf="#+id/linearLayoutFirstName"
android:layout_toEndOf="#+id/linearLayoutFirstName"
android:background="#android:color/transparent"
android:layout_gravity="center"
android:textSize="12sp"
android:layout_marginLeft="05dp"
android:id="#+id/mobileNo"
android:phoneNumber="true" />
</LinearLayout>
How to do this? Thank you.
Try this Example...
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<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"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context=".MainActivity">
<EditText
android:id="#+id/edtCountryCode"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="phone"
android:hint="country_code"/>
<EditText
android:id="#+id/edtPhoneNumber"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/edtCountryCode"
android:inputType="phone"
android:hint="phone_no"/>
<TextView
android:id="#+id/tvIsValidPhone"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/edtPhoneNumber"
android:layout_marginTop="10dp"
android:layout_marginBottom="10dp"/>
<Button
android:id="#+id/btnValidate"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/tvIsValidPhone"
android:text="validate"/>
</RelativeLayout>
MainActivity.java
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.text.TextUtils;
import android.util.Patterns;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import com.google.i18n.phonenumbers.NumberParseException;
import com.google.i18n.phonenumbers.PhoneNumberUtil;
import com.google.i18n.phonenumbers.Phonenumber;
public class MainActivity extends AppCompatActivity {
TextView tvIsValidPhone;
EditText edtPhone;
EditText edtCountryCode;
Button btnValidate;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tvIsValidPhone = (TextView) findViewById(R.id.tvIsValidPhone);
edtCountryCode = (EditText) findViewById(R.id.edtCountryCode);
edtPhone = (EditText) findViewById(R.id.edtPhoneNumber);
btnValidate = (Button) findViewById(R.id.btnValidate);
btnValidate.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String countryCode = edtCountryCode.getText().toString().trim();
String phoneNumber = edtPhone.getText().toString().trim();
if(countryCode.length() > 0 && phoneNumber.length() > 0){
if(isValidPhoneNumber(phoneNumber)){
boolean status = validateUsing_libphonenumber(countryCode, phoneNumber);
if(status){
tvIsValidPhone.setText("Valid Phone Number (libphonenumber)");
} else {
tvIsValidPhone.setText("Invalid Phone Number (libphonenumber)");
}
}
else {
tvIsValidPhone.setText("Invalid Phone Number (isValidPhoneNumber)");
}
} else {
Toast.makeText(getApplicationContext(), "Country Code and Phone Number is required", Toast.LENGTH_SHORT).show();
}
}
});
}
private boolean isValidPhoneNumber(CharSequence phoneNumber) {
if (!TextUtils.isEmpty(phoneNumber)) {
return Patterns.PHONE.matcher(phoneNumber).matches();
}
return false;
}
private boolean validateUsing_libphonenumber(String countryCode, String phNumber) {
PhoneNumberUtil phoneNumberUtil = PhoneNumberUtil.getInstance();
String isoCode = phoneNumberUtil.getRegionCodeForCountryCode(Integer.parseInt(countryCode));
Phonenumber.PhoneNumber phoneNumber = null;
try {
//phoneNumber = phoneNumberUtil.parse(phNumber, "IN"); //if you want to pass region code
phoneNumber = phoneNumberUtil.parse(phNumber, isoCode);
} catch (NumberParseException e) {
System.err.println(e);
}
boolean isValid = phoneNumberUtil.isValidNumber(phoneNumber);
if (isValid) {
String internationalFormat = phoneNumberUtil.format(phoneNumber, PhoneNumberUtil.PhoneNumberFormat.INTERNATIONAL);
Toast.makeText(this, "Phone Number is Valid " + internationalFormat, Toast.LENGTH_LONG).show();
return true;
} else {
Toast.makeText(this, "Phone Number is Invalid " + phoneNumber, Toast.LENGTH_LONG).show();
return false;
}
}}
Download jar file and add in libs folder from below link..
http://www.java2s.com/Code/Jar/l/Downloadlibphonenumber41jar.htm
Try to use isGlobalPhoneNumber() method of PhoneNumberUtils to detect whether a number is valid phone number or not.
I want to make android Contacts app, there is no problem with my code but when I execute the code, the App crush and show a message
"Exavier unfortunately has stopped working "
--Main Activity.java
package com.example.enig.exaviser;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import java.io.File
public class MainActivity extends ActionBarActivity {
SQLiteDatabase contactsDB = null;
Button createDBButton, addContactButton, deleteContactButton, getContactsButton,
deleteDBButton;
EditText nameEditText, emailEditText, contactListEditText, idEditText;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_main);
createDBButton = (Button) findViewById(R.id.createDBButton);
addContactButton = (Button) findViewById(R.id.addContactButton);
deleteContactButton = (Button) findViewById(R.id.deleteContactButton);
getContactsButton = (Button) findViewById(R.id.getContactsButton);
deleteDBButton = (Button) findViewById(R.id.deleteDBButton);
nameEditText = (EditText) findViewById(R.id.nameEditText);
emailEditText = (EditText) findViewById(R.id.emailEditText);
contactListEditText = (EditText) findViewById(R.id.contactListEditText);
idEditText = (EditText) findViewById(R.id.idEditText);
}
public void createDatabase(View view) {
try{
// Opens a current database or creates it
// Pass the database name, designate that only this app can use it
// and a DatabaseErrorHandler in the case of database corruption
contactsDB = this.openOrCreateDatabase("MyContacts", MODE_PRIVATE, null);
// Execute an SQL statement that isn't select
contactsDB.execSQL("CREATE TABLE IF NOT EXISTS contacts " +
"(id integer primary key, name VARCHAR, email VARCHAR);");
// The database on the file system
File database = getApplicationContext().getDatabasePath("MyContacts.db");
// Check if the database exists
if (database.exists()) {
Toast.makeText(this, "Database Created", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(this, "Database Missing", Toast.LENGTH_SHORT).show();
}
}
catch(Exception e){
Log.e("CONTACTS ERROR", "Error Creating Database");
}
// Make buttons clickable since the database was created
addContactButton.setClickable(true);
deleteContactButton.setClickable(true);
getContactsButton.setClickable(true);
deleteDBButton.setClickable(true);
}
public void addContact(View view) {
// Get the contact name and email entered
String contactName = nameEditText.getText().toString();
String contactEmail = emailEditText.getText().toString();
// Execute SQL statement to insert new data
contactsDB.execSQL("INSERT INTO contacts (name, email) VALUES ('" +
contactName + "', '" + contactEmail + "');");
}
public void getContacts(View view) {
// A Cursor provides read and write access to database results
Cursor cursor = contactsDB.rawQuery("SELECT * FROM contacts", null);
// Get the index for the column name provided
int idColumn = cursor.getColumnIndex("id");
int nameColumn = cursor.getColumnIndex("name");
int emailColumn = cursor.getColumnIndex("email");
// Move to the first row of results
cursor.moveToFirst();
String contactList = "";
// Verify that we have results
if(cursor != null && (cursor.getCount() > 0)){
do{
// Get the results and store them in a String
String id = cursor.getString(idColumn);
String name = cursor.getString(nameColumn);
String email = cursor.getString(emailColumn);
contactList = contactList + id + " : " + name + " : " + email + "\n";
// Keep getting results as long as they exist
}while(cursor.moveToNext());
contactListEditText.setText(contactList);
} else {
Toast.makeText(this, "No Results to Show", Toast.LENGTH_SHORT).show();
contactListEditText.setText("");
}
}
public void deleteContact(View view) {
// Get the id to delete
String id = idEditText.getText().toString();
// Delete matching id in database
contactsDB.execSQL("DELETE FROM contacts WHERE id = " + id + ";");
}
public void deleteDatabase(View view) {
// Delete database
this.deleteDatabase("MyContacts");
}
#Override
protected void onDestroy() {
contactsDB.close();
super.onDestroy();
}
}
fragment_main.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" android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:paddingBottom="#dimen/activity_vertical_margin" tools:context=".MainActivity">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Create Database"
android:id="#+id/createDBButton"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:onClick="createDatabase"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Add Contact"
android:id="#+id/addContactButton"
android:layout_alignParentTop="true"
android:layout_toRightOf="#+id/createDBButton"
android:layout_toEndOf="#+id/createDBButton"
android:layout_marginLeft="10dp"
android:onClick="addContact"
android:clickable="false" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Delete Contact"
android:id="#+id/deleteContactButton"
android:layout_below="#+id/createDBButton"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:onClick="deleteContact"
android:clickable="false"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Get Contacts"
android:id="#+id/getContactsButton"
android:layout_below="#+id/createDBButton"
android:layout_toRightOf="#+id/deleteContactButton"
android:layout_toEndOf="#+id/deleteContactButton"
android:layout_marginLeft="10dp"
android:onClick="getContacts"
android:clickable="false"/>
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/nameEditText"
android:layout_below="#+id/deleteContactButton"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:hint="Name"
android:layout_marginTop="5dp"/>
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/emailEditText"
android:layout_below="#+id/nameEditText"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:hint="Email"
android:layout_marginTop="5dp"
android:inputType="textEmailAddress"/>
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="number"
android:ems="10"
android:id="#+id/idEditText"
android:layout_below="#+id/emailEditText"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:hint="ID to Delete"
android:layout_marginTop="5dp"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Delete Database"
android:id="#+id/deleteDBButton"
android:onClick="deleteDatabase"
android:clickable="false"
android:layout_above="#+id/contactListEditText"
android:layout_alignRight="#+id/contactListEditText"
android:layout_alignEnd="#+id/contactListEditText" />
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="textMultiLine"
android:ems="10"
android:id="#+id/contactListEditText"
android:lines="8"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
</RelativeLayout>
How can I fix this problem? thanks in advance
The reason you are having this problem is because the activity is extending ActionBarActivity which requires the AppCompat theme to be applied.
All you need to do is add android:theme="#style/Theme.AppCompat.Light" to your application tag in the AndroidManifest.xml file.
i ve created a project with a single activity in android and i want to add a new record to database by pressing "insert button" as i showed in picture, but i want as soon as the New record saved to database , ListView updates and show the added record to the list in the last position...
when i run this code unexpected error occures and it close
where is the error or any suggestion ...
i put all the codes and layout here...
MainActivity.java
package com.example.db;
import java.util.ArrayList;
import android.app.Activity;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
import android.widget.Toast;
public class MainActivity extends Activity implements OnClickListener {
Button Btninser;
SQLiteDatabase db;
EditText etName, etPhone;
ListView lv;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
etName = (EditText) findViewById(R.id.etName);
etPhone = (EditText) findViewById(R.id.etPhone);
Btninsert = (Button) findViewById(R.id.btnInsert);
lv = (ListView) findViewById(R.id.listView1);
Btninsert.setOnClickListener(this);
Open_Create();
}
public void Open_Create() {
db = openOrCreateDatabase("MyDB1", MODE_PRIVATE, null);
db.execSQL("CREATE TABLE IF NOT EXISTS MyTable (_id INTEGER PRIMARY KEY AUTOINCREMENT, LastName VARCHAR,Phone VARCHAR);");
}
public void Insert_Info() {
db.execSQL("INSERT INTO MyTable (LastName,Phone) VALUES('" + etName.getText().toString()
+ "','" + etPhone.getText().toString() + "');");
Populate_ListView();
// db.close();
Toast.makeText(this, "Data has been saved!", Toast.LENGTH_LONG).show();
}
public void Populate_ListView() {
Cursor cursor = db.rawQuery("SELECT LastName,Phone FROM MyTable", null);
startManagingCursor(cursor);
String[] from = new String[] { "LastName", "Phone" };
int[] to = new int[] { R.id.tvItemListName, R.id.tvItemListPhone };
SimpleCursorAdapter adapter = new SimpleCursorAdapter(this,
R.layout.item_list, cursor, from, to);
lv.setAdapter(adapter);
}
And here is the XML file
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:text="Name" />
<EditText
android:id="#+id/etName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_toRightOf="#+id/textView1"
android:ems="10" >
<requestFocus />
</EditText>
<TextView
android:id="#+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:text="Phone" />
<EditText
android:id="#+id/etPhone"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_toRightOf="#+id/textView1"
android:ems="10" >
</EditText>
<Button
android:id="#+id/btnInsert"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:text="Insert" />
<ListView
android:id="#+id/listView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="21dp" >
</ListView>
</RelativeLayout>
I ve added the error from DDMS also
as you can see in Error page It mentioned a field "_id" that i never had it!!!! :(
confusing me too much...
If you want to use a Cursor, Android automatically assumes that your tables have a column called _id which acts as the row's unique primary identifier, for more details on that see the "Class Overview" section of the CursorAdapter's documentation which says:
Adapter that exposes data from a Cursor to a ListView widget. The Cursor must include a column named "_id" or this class will not work.
Basically all you need to do is replace your CREATE TABLE call with:
db.execSQL("CREATE TABLE IF NOT EXISTS MyTable (_id INTEGER PRIMARY KEY AUTOINCREMENT, LastName VARCHAR,Phone VARCHAR);");
That should fix your crash. To get it to automatically refresh the list, see my comment regrading notifyDatasetChanged().
And as a sidenote: I'd strongly recommend using a SQLiteOpenHelper instance to handle the opening and creation of your tables, rather than what you are doing now, it's bad form to repeatedly call CREATE TABLE IF NOT EXISTS where you could only call it the one time you know it'd need to be called. Vogella.com has a great guide on that.
Edit: Based on your last edit of your code: You're still not requesting the _id field that you made. If you don't have it in your SELECT statement the cursor can't access it!
Replace your rawQuery in Populate_ListView with SELECT * FROM MyTable so that the _id field is also returned by the cursor.
Have you try to delete Open_Create() call from onClick() method? You have two consecutive call to openOrCreateDatabase() without any close() in the middle. Don't forget the try { ... } catch (SQLiteException) { ... }. You test.
I want to create an android application that can run SQL Query to my SQL Server Database.
Here is my basic idea:
I create an android application with 1 textbox and 1 button.
Users can write the query that they want (e.g. INSERT INTO..,
UPDATE.., DELETE.., or EXEC [store procedure]) in the textbox.
Then users press the button to execute that query to run in my SQL
Server Database.
What I've made so far is an Android Application using phonegap + jQuery Mobile and I can get some data from my WCF Service with JSON that connect to my SQL Server, but now I want to run some query that I write from android application and run it to my database. Is it possible? Can you tell me the recommendation tutorials? Thanks :)
It can be done.
Create an Android application with an EditText and a Button.
Users can type the query to run (e.g. INSERT INTO.., UPDATE.., DELETE.., or EXEC [store procedure]) into the EditText.
You could do this like below to make it more user friendly.
Give users some options for Insert/Update/Delete via buttons.
Add a Spinner with all the table names.
If the user select a table name, show some _EditText_s for all the columns you need to get a value from the user.
Also you can make separate methods to call accordingly, with required inputs. It will be less complex more user friendly.
I don't know if it Is makes any sense.
Yas You can dear ..
i just success with select data from the sql server and i am sure very soon i am defiantly reach to the insert update and delete too.
for now you can also follow this tutorial which is actually in different language but you can go through the android and eclipse is working on english so just follow my steps.
1st make one project and download jtdc driver from this link but make sure the jtdc driver version is "1.2.7"
http://sourceforge.net/projects/jtds/files/jtds/1.2.7/
put this jar file in libs folder and write click on libs folder and build-add jar file and take that from libs folder and press ok which is reference library for sql server never forget this.
Now just follow my code bellow.
Make a xml file "sqlservermain.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"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context=".SqlServerMain" >
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="22dp"
android:text="SQL SERVER" />
<Button
android:id="#+id/btn_enter"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/edt_name"
android:layout_alignBottom="#+id/edt_name"
android:layout_alignParentRight="true"
android:text="Enter" />
<ListView
android:id="#+id/lst_name"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignRight="#+id/btn_enter"
android:layout_below="#+id/btn_enter"
android:layout_marginTop="19dp" >
</ListView>
<EditText
android:id="#+id/edt_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/lst_name"
android:layout_below="#+id/textView1"
android:layout_marginTop="15dp"
android:ems="10" />
</RelativeLayout>
then make one another xml file which is "sql.xml" file
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<TextView
android:id="#+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/textView1"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:background="#000000"
android:text="Medium Text"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="#00BFFF"
android:textStyle="bold" />
<ImageView
android:id="#+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:src="#drawable/ic_launcher" />
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="#+id/imageView1"
android:layout_toRightOf="#+id/imageView1"
android:text="Large Text"
android:textAppearance="?android:attr/textAppearanceLarge" />
</RelativeLayout>
now make one java file which is "sqlservermain.java" file.
package com.sqlserver;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.os.Bundle;
import android.os.StrictMode;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.Toast;
public class SqlServerMain extends Activity {
private Button _btnenter;
private EditText _edtval;
private ListView _lstname;
private Connection connect;
private SimpleAdapter AD;
private void declaration() {
_btnenter = (Button) findViewById(R.id.btn_enter);
_edtval = (EditText) findViewById(R.id.edt_name);
_lstname = (ListView) findViewById(R.id.lst_name);
}
private void Initialization() {
declaration();
_edtval.setText("Select Value");
connect = CONN("user","pass","db","server");
}
#SuppressLint("NewApi")
private Connection CONN(String _user, String _pass, String _DB,
String _server) {
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder()
.permitAll().build();
StrictMode.setThreadPolicy(policy);
Connection conn = null;
String connURL = null;
try {
Class.forName("net.sourceforge.jtds.jdbc.Driver");
connURL = "jdbc:jtds:sqlserver://" + _server + ";"
+ "databaseName=" + _DB + ";user=" + _user + ";password="
+ _pass + ";";
conn = DriverManager.getConnection(connURL);
} catch (SQLException se) {
Log.d("Error", se.getMessage());
// Toast.makeText(this, "Error : " + se,Toast.LENGTH_LONG).show();
} catch (ClassNotFoundException ce) {
Log.d("Error", ce.getMessage());
// Toast.makeText(this, "Error : " + ce,Toast.LENGTH_LONG).show();
} catch (Exception e) {
Log.d("Error", e.getMessage());
// Toast.makeText(this, "Error : " + e, Toast.LENGTH_LONG).show();
}
return conn;
}
public void QuerySQL(String COMANDOSQL) {
ResultSet rs;
try {
Statement statement = connect.createStatement();
rs = statement.executeQuery(COMANDOSQL);
List<Map<String, String>> data = null;
data = new ArrayList<Map<String, String>>();
while (rs.next()) {
Map<String, String> datanum = new HashMap<String, String>();
datanum.put("A", rs.getString("Table Field 1"));
datanum.put("B", rs.getString("Table Field 2"));
data.add(datanum);
}
String[] from = { "A", "B" };
int[] views = { R.id.textView2, R.id.textView1 };
AD = new SimpleAdapter(this, data, R.layout.sql, from, views);
_lstname.setAdapter(AD);
} catch (Exception e) {
// TODO: handle exception
}
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.sqlservermain);
Initialization();
_btnenter.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
QuerySQL(_edtval.getText().toString());
}
});
}
}
And now its time to give some permission in "AndroidManifest.xml"
which is
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
anjoy thats it for retriving.
the data.