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

[Q] Notiy the user of a variable - Android

Hi y'all. I have recently been trying to make a calculator app in AS. However, the app stops when I click the calculate button. I also wanted to have it notify the user the result contained in the result variable, but the setContentText doesn't want to work. Code:
Code:
package firstapp.stars.com.firstapp;
import android.os.Bundle;
import android.app.Notification;
import android.app.NotificationManager;
import android.support.v4.app.NotificationCompat;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class AddScrn extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_add);
final Button button4;
button4 = (Button) findViewById(R.id.button4);
button4.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
TextView textView4 = (TextView) findViewById(R.id.textView4);
EditText editText7 = (EditText) findViewById(R.id.editText7);
EditText editText8 = (EditText) findViewById(R.id.editText8);
String mynum1=editText7.getText().toString();
String mynum2=editText8.getText().toString();
int result = Integer.parseInt(mynum1) + Integer.parseInt(mynum2);
textView4.setText(Integer.toString(result));
textView4.setText(result);
Notification notification = new Notification.Builder(getApplicationContext())
.setContentTitle("Calculator - Calculation result:")
String content = String.valueOf(result);
.setContentText(content);
NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
// hide the notification after its selected
notification.flags |= Notification.FLAG_AUTO_CANCEL;
notificationManager.notify(0, notification);
}
});
}
@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_add_scrn, 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);
}
}
Help.

Whats-a-username? said:
Hi y'all. I have recently been trying to make a calculator app in AS. However, the app stops when I click the calculate button. I also wanted to have it notify the user the result contained in the result variable, but the setContentText doesn't want to work. Code:
Code:
package firstapp.stars.com.firstapp;
import android.os.Bundle;
import android.app.Notification;
import android.app.NotificationManager;
import android.support.v4.app.NotificationCompat;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class AddScrn extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_add);
final Button button4;
button4 = (Button) findViewById(R.id.button4);
button4.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
TextView textView4 = (TextView) findViewById(R.id.textView4);
EditText editText7 = (EditText) findViewById(R.id.editText7);
EditText editText8 = (EditText) findViewById(R.id.editText8);
String mynum1=editText7.getText().toString();
String mynum2=editText8.getText().toString();
int result = Integer.parseInt(mynum1) + Integer.parseInt(mynum2);
textView4.setText(Integer.toString(result));
textView4.setText(result);
Notification notification = new Notification.Builder(getApplicationContext())
.setContentTitle("Calculator - Calculation result:")
String content = String.valueOf(result);
.setContentText(content);
NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
// hide the notification after its selected
notification.flags |= Notification.FLAG_AUTO_CANCEL;
notificationManager.notify(0, notification);
}
});
}
@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_add_scrn, 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);
}
}
Help.
Click to expand...
Click to collapse
Regarding the following code:
textView4.setText(Integer.toString(result));
textView4.setText(result);
Why you assign the value twice?
The first assignment is OK, but the second one need to removed.
The result variable is an Integer type, and when you assign Integer to TextView, it will look for a sting resource id (in the strings xml).
If the id is not found, it can throw an exception.

Yes, but the app still crashes when the button is clicked and still doesn't want to notify me.

Still Active Errors
1. In the setContentTitle it says" ; expected", but when ; is placed, it highlights everything.
2. "Cannot resolve method setContentText".

Whats-a-username? said:
1. In the setContentTitle it says" ; expected", but when ; is placed, it highlights everything.
2. "Cannot resolve method setContentText".
Click to expand...
Click to collapse
Your code is incorrect.
Change you code to the following:
String content = String.valueOf(result);
Notification notification = new Notification.Builder(this)
.setContentTitle("Calculator - Calculation result:")
.setContentText(content).build();

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

Android Studio Error MainActivity class Help

Hey guys.I am getting these errors in MainActivity java file when I create new project.I am a newbie.
package com.gaama.learnit;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
public class MainActivity extends AppCompatActivity {
@override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@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);
}
}

Okay guys its okay now.Admin you can remove the post

Pass variable from one activity to another

I want to show the result activity on the end of the quiz which is working. And then show the scores activity on press of a button on the main activity
Advice I got is to Create a listener for the scores button on Main Activity and add code to launch the Scores Activity with an intent where you pass the score. And then retrieve the bundle on the onCreate method on your ScoresActivity. Can someone help me on this please regarding the code.
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;
import android.widget.TextView;
import android.widget.Toast;
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);
myDb.insertData();
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);
}
}
Result:
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;
int score;
@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();
score = b.getInt("score");
textResult.setText("You scored" + " " + score + " for the quiz.");
}
public void getScore()
{
Intent intent2 = new Intent(Result.this,
Scores.class);
Bundle bun = new Bundle();
bun.putInt("score", score);
intent2.putExtras(bun);
startActivity(intent2);
finish();
}
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:
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);
Result res = new Result();
res.getScore();
TextView txtScore1 = (TextView) findViewById(R.id.txtScore1);
Bundle bun = getIntent().getExtras();
int score = bun.getInt("score");
txtScore1.setText("Last quiz score:" + " " + score + ".");
}
@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);
}
}

You should never create instances of activity with "new" keyword, because Activity is a part of Android ecosystem, not just a java class. So the line with
Code:
new Result();
is wrong. Then, if you want to pass some data from one activity to another when the latter is being opened after click, you need to put you data in the Intent (like you did it right, but in the wrong place in code)
Code:
scoresbtn.setOnClickListener(
new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent2 = new Intent(Result.this,
Scores.class);
Bundle bun = new Bundle();
bun.putInt("score", score);
intent2.putExtras(bun);
startActivity(intent2);
}
}
);
That's it, your code on fetching the "score" variable out of Intent in Score activity is seemingly right.

svvorf said:
You should never create instances of activity with "new" keyword, because Activity is a part of Android ecosystem, not just a java class. So the line with
Code:
new Result();
is wrong. Then, if you want to pass some data from one activity to another when the latter is being opened after click, you need to put you data in the Intent (like you did it right, but in the wrong place in code)
Code:
scoresbtn.setOnClickListener(
new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent2 = new Intent(Result.this,
Scores.class);
Bundle bun = new Bundle();
bun.putInt("score", score);
intent2.putExtras(bun);
startActivity(intent2);
}
}
);
That's it, your code on fetching the "score" variable out of Intent in Score activity is seemingly right.
Click to expand...
Click to collapse
Can you maybe show me where to put this in my code. And help me with the new Result() part