Database Develop

[Q] Setting restriction on editText

Hello, I am new to java and having difficulties trying to set a restriction on one of my editText.
I am trying to develop an app that allows user to fill there information in the application and then send through an email client.
So for my phone number section i am trying to make a restriction for only 11 characters to be entered, also for all the fields to be completed to process through the next stage.
here is my coding:
package com.example.rumel.booking2;
import android.content.Intent;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
public class MainActivity extends ActionBarActivity implements View.OnClickListener {
EditText personName, numberGuests, phoneNumber, date, time;
String name, guests, number, dte, tme;
Button sendEmail;
@override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initializerVars();
sendEmail.setOnClickListener(this);
}
private void initializerVars() {
personName = (EditText) findViewById(R.id.etName);
numberGuests = (EditText) findViewById(R.id.etGuest);
phoneNumber = (EditText) findViewById(R.id.etPhone);
date = (EditText) findViewById(R.id.etDate);
time = (EditText) findViewById(R.id.etTime);
sendEmail = (Button) findViewById(R.id.button);
}
public void onClick (View v) {
// TODO Auto-generated method stub
convertEditTextVarsIntoStringsAndYesThisIsAMethodWeCreated();
String[] to = new String[]{"[email protected]"};
String message = "Name: "
+ name
+ "\n"
+ " Number of Guests: "
+ guests
+ "\n"
+ " Contact Number: "
+ number
+ "\n"
+ " Date: "
+ dte
+ ", Time: "
+ tme
+ "\n"
+ "\n"
+ "Thank you";
Intent emailIntent = new Intent (Intent.ACTION_SEND);
emailIntent.putExtra(Intent.EXTRA_EMAIL, to);
emailIntent.putExtra(Intent.EXTRA_SUBJECT, "Reservation");
emailIntent.putExtra(Intent.EXTRA_TEXT, message);
emailIntent.setType("message/rfc822");//rfc822 email protocol
startActivity(Intent.createChooser(emailIntent,"Email"));
}
private void convertEditTextVarsIntoStringsAndYesThisIsAMethodWeCreated() {
// TODO Auto-generated method stub
name = personName.getText().toString();
guests = numberGuests.getText().toString();
number = phoneNumber.getText().toString();
dte = date.getText().toString();
tme = time.getText().toString();
}
@override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
finish();
}
@override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
Would appreciate any help, thank you

Insert data to database SQlite

I want to insert data to a database I have created. I have created an insert command at the OnCreate class. When viewing the database in SQLite Browser the data do not show. Can anyone help me
DatabaseHelper
Code:
package app.mobiledevicesecurity;
import android.content.ContentValues;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
/**
* Created by Martin on 2015/07/28.
*/
public class DatabaseHelper extends SQLiteOpenHelper {
public static final String DATABASE_NAME = "mobilesec.db";
public static final String TABLE_NAME = "read_table";
public static final String COL_1 = "ID";
public static final String COL_2 = "CATEGORY";
public static final String COL_3 = "HEADING";
public static final String COL_4 = "INFO";
public DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, 1);
SQLiteDatabase db = this.getWritableDatabase();
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("create table " + TABLE_NAME + " (ID INTEGER PRIMARY KEY AUTOINCREMENT, CATEGORY TEXT, HEADING TEXT, INFO TEXT)");
ContentValues cv = new ContentValues();
cv.put(COL_2,"Malware");
cv.put(COL_3,"Virus");
cv.put(COL_4,"Harmfull for device");
db.insert(TABLE_NAME, null, cv);
}
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS "+TABLE_NAME);
onCreate(db);
}
}
MainActivity
Code:
package app.mobiledevicesecurity;
import android.content.Intent;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
public class MainActivity extends ActionBarActivity {
DatabaseHelper myDb;
private static Button readbtn;
private static Button quizbtn;
private static Button scoresbtn;
private static Button settingsbtn;
private static Button helpbtn;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myDb = new DatabaseHelper(this);
OnClickReadButtonListener();
OnClickQuizButtonListener();
OnClickScoresButtonListener();
OnClickSettingsButtonListener();
OnClickHelpButtonListener();
}
public void OnClickReadButtonListener() {
readbtn = (Button) findViewById(R.id.readbutton);
readbtn.setOnClickListener(
new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent("app.mobiledevicesecurity.Read_Category");
startActivity(intent);
}
}
);
}
public void OnClickQuizButtonListener() {
quizbtn = (Button) findViewById(R.id.quizbutton);
quizbtn.setOnClickListener(
new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent("app.mobiledevicesecurity.Quiz");
startActivity(intent);
}
}
);
}
public void OnClickScoresButtonListener() {
scoresbtn = (Button) findViewById(R.id.scoresbutton);
scoresbtn.setOnClickListener(
new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent("app.mobiledevicesecurity.Scores");
startActivity(intent);
}
}
);
}
public void OnClickSettingsButtonListener() {
settingsbtn = (Button) findViewById(R.id.settingsbutton);
settingsbtn.setOnClickListener(
new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent("app.mobiledevicesecurity.Settings");
startActivity(intent);
}
}
);
}
public void OnClickHelpButtonListener() {
helpbtn = (Button) findViewById(R.id.helpbutton);
helpbtn.setOnClickListener(
new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent("app.mobiledevicesecurity.Help");
startActivity(intent);
}
}
);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
when I run the app on the emulator and open Android Device Monitor and get the database file and open it with SQlite Browser. Only the Column names are created the values are not shown. Why is this happening

Try to commit after you insert a record, also I think you can check what the insert command is returning to see if the insert command was successful or not...

The reason it isn't working is because you probably added the the insert after you had already created your database, so therefore onCreate is not being called anymore.
onUpgrade will only be called if you change the version of your database, so that will not be called either.
you should just make another method that is used to update your table, or explicitly call Oncreate.
what I did while I was testing is in the constructor of my database class, i would call a method that would drop all the tables, and then explicitly call onCreate after that. Remove this code when you are done testing

Pass data from one activity to another

Can you help me. I have developed a app with a quiz. When the quiz is finished a new activity (result) appears showing the score. I want to pass the score to a new activity namely score. Here is my code. What is wrong. The score must be showed in a textview.
Result.java
Code:
package app.mobiledevicesecurity;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class Result extends Activity
{
private static Button playbtn;
private static Button menubutton;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_result);
OnClickPlayButtonListener();
OnClickMenuButtonListener();
TextView textResult = (TextView) findViewById(R.id.textResult);
Bundle b = getIntent().getExtras();
int score = b.getInt("score");
textResult.setText("You scored" + " " + score + " for the quiz.");
Intent i = new Intent(getApplicationContext(), Result.class);
i.putExtra("somevariable",score);
startActivity(i);
}
public void OnClickPlayButtonListener() {
playbtn = (Button) findViewById(R.id.btn);
playbtn.setOnClickListener(
new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent("app.mobiledevicesecurity.Quiz");
startActivity(intent);
}
}
);
}
public void OnClickMenuButtonListener() {
menubutton = (Button) findViewById(R.id.menubtn);
menubutton.setOnClickListener(
new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(getApplicationContext(), MainActivity.class);
startActivity(intent);
}
}
);
}
Scores.java
Code:
package app.mobiledevicesecurity;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;
import android.content.Intent;
public class Scores extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_scores);
Intent intent = getIntent();
String value = intent.getStringExtra("somevariable");
TextView txtScore1 = (TextView) findViewById(R.id.txtScore1);
txtScore1.setText("You scored" + " " + value + " for the quiz.");
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_scores, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}

Try this
In Result.java
i.putExtra("somevariable",score);alter this code like below..
i.putExtra("somevariable", score.toString());
you are passing integer and getting as string..try to pass it as string may help
or simply change this in scores.java
String value = intent.getStringExtra("somevariable")alter this code like below
Int value = intent.getIntExtra("somevariable")
Sent from my SM-N900 using XDA Free mobile app

As noted by taku_coder you are sending and int then you try to extract a String at least be consistent if you want to send an int then extract as an int on your receiving Activity.
Also i noted that the that you are sending the value to Result Activity shouldnt it be the Scores Activity?
Intent i = new Intent(getApplicationContext(), Result.class);
i.putExtra("somevariable",score);
startActivity(i);
Shouldnt it be like this?
Intent i = new Intent(getApplicationContext(), Scores.class);
i.putExtra("somevariable",score);
startActivity(i);

In Result.java
intent.putExtra("KeyName",X.toString());
you are passing as string, you can get it by using
intent.getextra("KeyName")

Intent i = new Intent(getApplicationContext(), Result.class);
i.putExtra("somevariable",score);
startActivity(i);
It seems to be the code above in OnCreate() method of Result make recursive creation of Result class.

Help with grid View

Hello!
i need some help, i am creating a Grid View with this java code:
MainActivity
public class MainActivity extends AppCompatActivity {
private GridView gridView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
gridView = (GridView)findViewById(R.id.gridview);
gridView.setAdapter(new GridAdapter(this));
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
Click to expand...
Click to collapse
Product
public class Product {
private static String nombrePizza;
private static String ingredientesPizza;
private static int imagenPizza;
private static int idThumbnail;
public Product(String nombrePizza, String ingredientesPizza, int imagenPizza){
this.nombrePizza = nombrePizza;
this.ingredientesPizza = ingredientesPizza;
this.imagenPizza = imagenPizza;
}
public String getNombrePizza(){return nombrePizza;}
public String getIngredientesPizza(){return ingredientesPizza;}
public int getImagenPizza(){return imagenPizza;}
public int getId(){return nombrePizza.hashCode();}
public static Product[] Pizzas={
new Product(
"Proscuito",
"Jamon York y queso",
R.drawable.imagenprueba),
new Product(
"Tropical",
"Jamon York, queso y piña",
R.drawable.imagenprueba),
new Product(
"Barbacoa",
"Carne picada, queso y salsa Barbacoa",
R.drawable.imagenprueba),
new Product(
"Romana",
"Jamon York, champiñones y queso",
R.drawable.cubo),
};
public static Product getItem(int id) {
for (Product item : Pizzas) {
if (item.getId() == id) {
return item;
}
}
return null;
}
}
Click to expand...
Click to collapse
Grid Adapter
public class GridAdapter extends BaseAdapter {
private final Context mContext;
public GridAdapter(Context c){
this.mContext = c;
}
@Override
public int getCount(){return Product.Pizzas.length;}
@Override
public Product getItem(int position){return Product.Pizzas[position];}
@Override
public long getItemId(int position){return 0;}
@Override
public View getView(int position, View ConvertView, ViewGroup viewGroup){
if(ConvertView == null){
LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
ConvertView = inflater.inflate(R.layout.grid_item, viewGroup, false);
}
TextView name = (TextView)ConvertView.findViewById(R.id.grid_mainText);
ImageView image = (ImageView) ConvertView.findViewById(R.id.grid_image);
TextView descripcion = (TextView) ConvertView.findViewById(R.id.grid_subText);
final Product item = getItem(position);
image.setImageResource(item.getImagenPizza());
name.setText(item.getNombrePizza());
descripcion.setText(item.getIngredientesPizza());
return ConvertView;
}
}
Click to expand...
Click to collapse
It work fine except for one thing, the app only shows the last product of the java code (Pizza romana)four times
I dont know why my app do this, can somebody help me??
Thank you! :fingers-crossed:

Try and catch for a bmi calculator

Hello, I am new to the app making world and a pretty bad coder while we're at it.
my bmi calculator crashes on launch in the emulator.
here is my code:
package com.gilad_inc.myapplication;
import android.content.Context;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
EditText height, weight;
@override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
makwork();
ConvertDouble();
}
public void makwork()
{
height = (EditText) findViewById(R.id.Height);
weight = (EditText) findViewById(R.id.Weight);
}
public void ConvertDouble()
{
EditText height = this.height;
EditText weight = this.weight;
Double H = Double.parseDouble(height.getText().toString());
Double W = Double.parseDouble(weight.getText().toString());
}
public void buttonOnClick(View v) {
makwork();
ConvertDouble();
float h = Float.valueOf(height.getText().toString());
float w = Float.valueOf(weight.getText().toString());
/***
* Time for math!
* BMI is calculated
* (weigth in kg / (height in meter * height in meter)
* But since we want the user to input in CM, we just
* multiply it with 10 000 to get the correct value.
*/
double BMI = w / (h * h) * 10000;
TextView tvBMI = (TextView) findViewById(R.id.BMI);
tvBMI.setText("" + BMI);
}
@override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
how can I prevent it from crashing?