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

Calculation from user input

I work at a casting company & sometimes have to calculate weights. I am building a simple app in android studio to do this & was hoping someone could help as im struggling. I have 3 user inputs set, but I want to take those inputs & run them through a calculation & the have the result displayed at the end. I want to set a button so when I have the 3 imputs & can click go, & the result gets displayed. This is my code at present.
Code:
package com.example.nealu.myapplication;
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 {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void onButtonClick(View V) {
EditText e1 = (EditText)findViewById(R.id.editText);
EditText e2 = (EditText)findViewById(R.id.editText2);
EditText e3 = (EditText)findViewById(R.id.editText3);
TextView t1 = (TextView) findViewById(R.id.textView);
}
@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);
}
}
I think im going wrong on the edit text bit but I have searched around & tried taking bits out of code for a calculator, but I need to do a little more than 10*5 etc when working a weight of a casting out so need to take the input & run it through a formula.
Any help would be greatly appreciated.
Thanks.

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 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.

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?