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<Android>create calculator in android studio (equal button did not work)

I'm creating a simple calculator in Android Studio but the equal button didn't work. When I clicked the equal button, the app crash but it didn't show any error message. Other buttons work fine, I couldn't figure out why my equal button didn't work.
This is my MainActivity.java
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.Button;
import android.widget.EditText;
import android.view.View;
public class MainActivity extends AppCompatActivity {
private EditText showNum;
private Button one;
private Button two;
private Button three;
private Button four;
private Button five;
private Button six;
private Button seven;
private Button eight;
private Button nine;
private Button zero;
private Button divide;
private Button multiple;
private Button minus;
private Button equal;
private Button dot;
private Button plus;
private Button clear;
private Boolean addButton, multipleButton, minusButton, divideButton;
Float value, currentValue;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
showNum=(EditText) findViewById(R.id.editView);
one = (Button)findViewById(R.id.button1);
two = (Button)findViewById(R.id.button2);
three = (Button)findViewById(R.id.button3);
four = (Button)findViewById(R.id.button4);
five = (Button)findViewById(R.id.button5);
six = (Button)findViewById(R.id.button6);
seven = (Button)findViewById(R.id.button7);
eight = (Button)findViewById(R.id.button8);
nine = (Button)findViewById(R.id.button9);
zero = (Button)findViewById(R.id.button0);
divide = (Button)findViewById(R.id.buttonDivide);
multiple = (Button)findViewById(R.id.buttonMultiple);
minus = (Button)findViewById(R.id.buttonMinus);
equal = (Button)findViewById(R.id.buttonEqual);
dot = (Button)findViewById(R.id.buttonDot);
plus = (Button)findViewById(R.id.buttonPlus);
clear = (Button)findViewById(R.id.buttonC);
clear.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v){
showNum.setText("");
}
});
zero.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v){
showNum.setText(showNum.getText()+"0");
}
});
one.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v){
showNum.setText(showNum.getText()+"1");
}
});
two.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v){
showNum.setText(showNum.getText()+"2");
}
});
three.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v){
showNum.setText(showNum.getText()+"3");
}
});
four.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v){
showNum.setText(showNum.getText()+"4");
}
});
five.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v){
showNum.setText(showNum.getText()+"5");
}
});
six.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v){
showNum.setText(showNum.getText()+"6");
}
});
seven.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v){
showNum.setText(showNum.getText()+"7");
}
});
eight.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v){
showNum.setText(showNum.getText()+"8");
}
});
nine.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v){
showNum.setText(showNum.getText()+"9");
}
});
dot.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v){
showNum.setText(showNum.getText()+".");
}
});
divide.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v){
value = Float.parseFloat(showNum.getText()+"");
divideButton=true;
showNum.setText(null);
}
});
multiple.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v){
if(showNum==null){
showNum.setText("");
}
else{
value = Float.parseFloat(showNum.getText()+"");
multipleButton=true;
showNum.setText(null);
}
}
});
plus.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v){
value = Float.parseFloat(showNum.getText()+"");
addButton=true;
showNum.setText(null);
}
});
minus.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v){
value = Float.parseFloat(showNum.getText()+"");
minusButton=true;
showNum.setText(null);
}
});
equal.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v){
currentValue = Float.parseFloat(showNum.getText()+"");
if (divideButton) {
showNum.setText(value / currentValue + "");
divideButton = false;
Log.i("gina", "b"+divideButton);
}
if (multipleButton){
showNum.setText(value * currentValue + "");
multipleButton = false;
}
if (addButton){
showNum.setText(value+currentValue + "");
addButton = false;
}
if (minusButton){
showNum.setText(value-currentValue + "");
minusButton = false;
}
}
});
}
}
Below is my 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"
tools:context="com.iu.hsiaoyuanwang.proficiency2.MainActivity">
<EditText
android:id="#+id/editView"
android:layout_alignParentTop="true"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text=""
android:padding="35dp"
android:textSize="30sp"
android:gravity="top|center" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="#+id/editView"
android:orientation="vertical"
android:id="#+id/linear1">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1">
<Button
android:id="#+id/button7"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="7"
android:textSize="20dp" />
<Button
android:id="#+id/button8"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="8"
android:textSize="20dp"
/>
<Button
android:id="#+id/button9"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:textSize="20dp"
android:text="9" />
<Button
android:id="#+id/buttonDivide"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="÷"
android:textSize="20dp" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1">
<Button
android:id="#+id/button4"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="4"
android:textSize="20dp" />
<Button
android:id="#+id/button5"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="5"
android:textSize="20dp"
/>
<Button
android:id="#+id/button6"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:textSize="20dp"
android:text="6" />
<Button
android:id="#+id/buttonMultiple"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="x"
android:textSize="20dp" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1">
<Button
android:id="#+id/button1"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="1"
android:textSize="20dp" />
<Button
android:id="#+id/button2"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="2"
android:textSize="20dp"
/>
<Button
android:id="#+id/button3"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:textSize="20dp"
android:text="3" />
<Button
android:id="#+id/buttonMinus"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="-"
android:textSize="20dp" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1">
<Button
android:id="#+id/button0"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="0"
android:textSize="20dp" />
<Button
android:id="#+id/buttonDot"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="."
android:textSize="20dp"
/>
<Button
android:id="#+id/buttonEqual"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:textSize="20dp"
android:text="=" />
<Button
android:id="#+id/buttonPlus"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="+"
android:textSize="20dp" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1">
<Button
android:id="#+id/buttonC"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="C"
android:textSize="20dp" />
</LinearLayout>
</LinearLayout>
</RelativeLayout>

As Kuti suggested, its better to keep only one OnClickListener, so keep his advice in mind.
A Boolean is an object, is not true or false, so the sentence if(addButton) when addButton is a Boolean is always false. Try using addButton.booleanValue() or use a boolean instead of a Boolean

Create multiplication table layout

I am trying to generate Multiplication Table of any number that is input by user. I have developed the interface for the application but cannot understand where to start with the logical part(coding). What i want is when a user inputs a number into the EditText then in the TextView (id: printArea) should show the table of the input number in the format as given in image 2. [Just to show you example i used TextView in the printArea part and i do not know what to use instead]
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity"
android:weightSum="1">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="16dp"
android:text="Please Enter a Number: "
android:textSize="20sp" />
<EditText
android:id="#+id/num"
android:layout_width="90dp"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_marginLeft="30dp"
android:textSize="20sp" />
</LinearLayout>
<Button
android:id="#+id/calculate"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_below="#+id/log"
android:onClick="submitNumber"
android:text="Get Table" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1.0"
android:id="#+id/printArea" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<Button
android:id="#+id/clear"
android:layout_width="125dp"
android:layout_height="wrap_content"
android:layout_marginLeft="2dp"
android:layout_marginRight="1dp"
android:text="Clear" />
<Button
android:id="#+id/credits"
android:layout_width="125dp"
android:layout_height="wrap_content"
android:layout_marginLeft="1dp"
android:layout_marginRight="1dp"
android:text="Credits" />
<Button
android:id="#+id/exit"
android:layout_width="125dp"
android:layout_height="wrap_content"
android:layout_marginLeft="1dp"
android:layout_marginRight="2dp"
android:text="Exit" />
</LinearLayout>
</LinearLayout>
and the MainActivity.java is:
package com.example.tara.multiplicationtable;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
EditText num;
Button credits;
Button calculate;
Button clear;
Button exit;
TextView printArea;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
num = new EditText(this);
clear = new Button(this);
calculate = new Button(this);
credits = new Button(this);
calculate = new Button(this);
printArea = new TextView(this);
num = (EditText) findViewById(R.id.num);
credits = (Button) findViewById(R.id.credits);
clear = (Button) findViewById(R.id.clear);
exit = (Button) findViewById(R.id.exit);
printArea = (TextView) findViewById(R.id.printArea);
calculate = (Button) findViewById(R.id.calculate);
calculate.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
//change the integer value into string
int num1 = Integer.parseInt(num.getText().toString());
// Perform action on click
for (int i = 1; i <= 10; i++) {
printArea.setText(num1 + "X" + i + "=" + i * num1);
}
}
});
clear.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
num.setText("");
}
});
credits.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent i = new Intent(MainActivity.this, Credits.class);
startActivity(i);
}
});
exit.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
finish();
System.exit(0);
}
});
}
}
when application is launched it should show like thisThe initial state of application
and i want to make the application show the table like this if user input is 2 The Final Result

Make a Listview and then in its adapter add your table data.
Make adapter's layout like this:
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="2" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="*" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="2" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="=" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="4" />

Here are the codes that i used to build the Multiplication Table that i imagined to build. The code for activity_main.xml file will be:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:layout_marginEnd="1dp"
android:layout_marginStart="2dp"
android:text="#string/Enter_number"
android:textSize="16sp" />
<EditText
android:id="#+id/num"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:layout_marginEnd="2dp"
android:layout_marginStart="1dp"
android:digits="0123456789"
android:hint="#string/hidden_text"
android:inputType="number"
android:maxLength="3"
android:textSize="16sp" />
</LinearLayout>
<Button
android:id="#+id/calculate"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/calculate"
android:imeOptions="actionDone"
android:textSize="16sp"/>
<!--android:onClick="submitNumber"-->
<TextView
android:id="#+id/printArea"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:textSize="20sp"
android:background="#drawable/backimage" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<Button
android:id="#+id/clear"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:layout_marginEnd="1dp"
android:layout_marginStart="2dp"
android:textSize="16sp"
android:text="#string/clear"
/>
<Button
android:id="#+id/credits"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:layout_marginEnd="1dp"
android:layout_marginStart="1dp"
android:textSize="16sp"
android:text="#string/credits" />
<Button
android:id="#+id/exit"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="2dp"
android:layout_marginStart="1dp"
android:layout_weight="1"
android:textSize="16sp"
android:text="#string/exit" />
</LinearLayout>
</LinearLayout>
The Code for the MainActivity.java file will be:
package com.example.tara.multiplicationtable;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
EditText num;
Button credits;
Button calculate;
Button clear;
Button exit;
TextView printArea;
//private static final String result = MainActivity.class.getSimpleName();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
num = new EditText(this);
clear = new Button(this);
calculate = new Button(this);
credits = new Button(this);
calculate = new Button(this);
printArea = new TextView(this);
num = (EditText) findViewById(R.id.num);
credits = (Button) findViewById(R.id.credits);
clear = (Button) findViewById(R.id.clear);
exit = (Button) findViewById(R.id.exit);
calculate = (Button) findViewById(R.id.calculate);
printArea = (TextView) findViewById(R.id.printArea);
calculate.setOnClickListener(new View.OnClickListener() {
// Perform action on Get Table Button click
public void onClick(View v) {
if (num.getText().length() == 0 ){
printArea.setText(R.string.err_msg);
}
else {
//change the integer value into string
printArea.setText("");
int num1 = Integer.parseInt(num.getText().toString());
String result;
for (int i = 1; i <= 10; i++) {
result = (num1 + " X " + i + " = " + i * num1);
printArea.append("\n" + result);
}
}
}
});
clear.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
num.setText("");
printArea.setText("");
}
});
credits.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
startActivity(new Intent(MainActivity.this, Credits.class));
}
});
exit.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(MainActivity.this, "Good Bye, User!", Toast.LENGTH_SHORT).show();
finish();
}
});
}
}
Thank you everyone for the guidance.

i need to make a button that opens a custom dialogbox

I'm creating an android app for my school project.
I created the interface normaly.
<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">
<ImageView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="#+id/imageView"
android:background="#drawable/mappic"
android:layout_above="#+id/zoomControls"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<ZoomControls
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/zoomControls"
android:layout_alignParentBottom="true"
android:layout_alignRight="#+id/imageView"
android:layout_alignEnd="#+id/imageView" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Obtenir le PCC"
android:id="#+id/button"
android:layout_alignBottom="#+id/zoomControls"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
</RelativeLayout>
now I want to make it when I click on the button : Obtenir le PCC this dialog box opens up :
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:backgroundTintMode="multiply"
android:backgroundTint="#ff7518ff">
<ImageView
android:id="#+id/image"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toLeftOf="#+id/Suivantbtn"
android:layout_alignLeft="#+id/Suivantbtn"
android:layout_alignStart="#+id/Suivantbtn" />
<TextView
android:id="#+id/textdp"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:text="Taper le poit de départ:"
android:textColor="#ff111124"
android:layout_alignBottom="#+id/Suivantbtn"
android:theme="#style/AppTheme"
android:textSize="30dp"
android:layout_below="#+id/image"
android:layout_marginTop="50dp"
android:layout_marginBottom="50dp"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:layout_marginRight="28dp"
android:layout_marginLeft="28dp" />/>
<Button
android:id="#+id/Suivantbtn"
android:layout_width="100px"
android:layout_height="wrap_content"
android:text="Suivant "
android:layout_centerVertical="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/editText"
android:layout_above="#+id/Suivantbtn"
android:layout_marginBottom="56dp"
android:layout_alignLeft="#+id/textdp"
android:layout_alignStart="#+id/textdp"
android:layout_alignRight="#+id/textdp"
android:layout_alignEnd="#+id/textdp"
android:textAlignment="center"
android:backgroundTint="#ff9eadff" />
</RelativeLayout>
and when I click on Suivant ,, the dialog box goes and another dialogbox appears :
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:backgroundTintMode="multiply"
android:backgroundTint="#ff7518ff">
<ImageView
android:id="#+id/image"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toLeftOf="#+id/Suivantbtn2"
android:layout_alignLeft="#+id/Suivantbtn2"
android:layout_alignStart="#+id/Suivantbtn2" />
<TextView
android:id="#+id/textar"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:text="Taper le poit d'arrivée:"
android:textColor="#ff111124"
android:layout_alignBottom="#+id/Suivantbtn2"
android:theme="#style/AppTheme"
android:textSize="30dp"
android:layout_below="#+id/image"
android:layout_marginTop="50dp"
android:layout_marginBottom="50dp"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:layout_marginRight="28dp"
android:layout_marginLeft="28dp" />/>
<Button
android:id="#+id/Suivantbtn2"
android:layout_width="100px"
android:layout_height="wrap_content"
android:text="Suivant "
android:layout_centerVertical="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/editText"
android:layout_above="#+id/Suivantbtn2"
android:layout_marginBottom="56dp"
android:layout_alignLeft="#+id/textar"
android:layout_alignStart="#+id/textar"
android:layout_alignRight="#+id/textar"
android:layout_alignEnd="#+id/textar"
android:textAlignment="center"
android:backgroundTint="#ff9eadff" />
</RelativeLayout>
the java code :
package artofdev.org.admaps;
import android.app.Activity;
import android.app.Dialog;
import android.content.Context;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
public class MainActivity extends Activity {
private ImageView imageView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
Context context = getApplicationContext();
final Button button = (Button) findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
final Dialog dialog = new Dialog(context);
dialog.setContentView(R.layout.dialog);
Button button2 = (Button) dialog.findViewById(R.id.Suivantbtn);
button2.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
final Dialog dialog2 = new Dialog(context);
dialog2.setContentView(R.layout.dialog2);
Button button3 = (Button)
dialog2.findViewById(R.id.Suivantbtn2);
button3.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
dialog2.dismiss();
}
});
dialog.dismiss();
dialog2.show();
}
});
dialog.show();
}
});
#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);
}
}
And when this appears and I type in and click on next. This dialog box dismisses and another msg box I'll create later shows a msg.
how to do it ?

Here is a fully working code for you:
Context context = getAplicationContext();
final Button button = (Button) findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
final Dialog dialog = new Dialog(context);
dialog.setContentView(R.layout.your_dialog_layout);
Button button2 = (Button) dialog.findViewById(R.id.Suivantbtn);
button2.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
final Dialog dialog2 = new Dialog(context);
dialog2.setContentView(R.layout.your_second_dialog_layout);
Button button3 = (Button) dialog2.findViewById(R.id.Suivantbtn2);
button3.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
dialog2.dismiss();
}
});
dialog.dismiss();
dialog2.show();
}
});
dialog.show();
}
});
Hope my answer helped!

Button button = (Button) findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener(){
#Override
//On click function
public void onClick(View view) {
//do something - for example open the dialog box you want
final Dialog dialog = new Dialog(getActivity());
dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
dialog.setContentView(R.layout.custom_alert_dialogue);
dialog.show();
}
});

You should add onClickListener to your buttons. For example (this code is for your Activity class):
Button button = (Button) findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener(){
#Override
//On click function
public void onClick(View view) {
//do something - for example open the dialog box you want
}
});

how to get the timer counted value in Android?

How to create an android mobile application that will do a counting in miliseconds (start from 0), and ask user to type"I Like to eat" in EditText and click submit. After user click submit, counting will stop and a dialog box will appear and show the counting result.
package com.example.labex4;
import java.util.Timer;
import java.util.TimerTask;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends Activity implements OnClickListener {
TextView textView1,textView2,textView3,textView4,displayValue;
EditText nameTxt;
Button button1;
int count = 0;
Timer T;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
T=new Timer();
T.scheduleAtFixedRate(new TimerTask() {
#Override
public void run() {
runOnUiThread(new Runnable()
{
#Override
public void run()
{
displayValue.setText("count="+count);
count++;
}
});
}
}, 0, 1);
textView1 = (TextView)findViewById(R.id.textView1);
textView2 = (TextView)findViewById(R.id.textView2);
textView3 = (TextView)findViewById(R.id.textView3);
textView4 = (TextView)findViewById(R.id.textView4);
displayValue = (TextView)findViewById(R.id.displayValue);
nameTxt = (EditText)findViewById(R.id.nameTxt);
button1 = (Button)findViewById(R.id.button1);
button1.setOnClickListener(this);
}
#Override
public void onClick(View v) {
T.cancel();
dialog.editext.setText(""+count);
}
}
***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="match_parent"
android:layout_height="match_parent"
tools:context="${relativePackage}.${activityClass}" >
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:text="(Type Faster)"
android:textAppearance="?android:attr/textAppearanceLarge" />
<TextView
android:id="#+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/textView1"
android:layout_below="#+id/textView1"
android:layout_marginTop="25dp"
android:text="Miliseconds: " />
<TextView
android:id="#+id/displayValue"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="#+id/textView2"
android:layout_toRightOf="#+id/textView2"
android:text="displayvalue" />
<TextView
android:id="#+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/textView2"
android:layout_centerHorizontal="true"
android:layout_marginTop="26dp"
android:text="Type this words: " />
<TextView
android:id="#+id/textView4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/textView3"
android:layout_centerHorizontal="true"
android:layout_marginTop="17dp"
android:text="Frankie Jones Anak Saing"
android:textAppearance="?android:attr/textAppearanceMedium" />
<EditText
android:id="#+id/nameTxt"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_below="#+id/textView4"
android:layout_marginTop="38dp"
android:ems="10" />
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/nameTxt"
android:layout_centerHorizontal="true"
android:layout_marginTop="37dp"
android:text="Check" />
</RelativeLayout>

Global Variable
int count = 0;
Timer T;
Put the below code in onCreate after setContentView
T=new Timer();
T.scheduleAtFixedRate(new TimerTask() {
#Override
public void run() {
runOnUiThread(new Runnable()
{
#Override
public void run()
{
//myTextView.setText("count="+count);
count++;
}
});
}
}, 0, 1);
At Button OnCLick
UPDATE
T.cancel();
//Open popup or dialog or alert as per your choice and print the count value
//dialog.editext.setText(""+count);
AlertDialog alertDialog = new AlertDialog.Builder(<YourActivityName>this).create(); //Read Update
alertDialog.setTitle("You total time count");
alertDialog.setMessage(String.valueof(count));
alertDialog.setButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// here you can add functions
alertDialog.dismiss();
}
});
alertDialog.show(); //<-- See This!
}
As Per Your Requirement I am pasting the whole class
import android.app.Activity;
import android.app.Dialog;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import java.util.Timer;
import java.util.TimerTask;
public class MainActivity extends Activity implements OnClickListener {
TextView textView1,textView2,textView3,textView4,displayValue;
EditText nameTxt;
Button button1;
int count = 0;
Timer T;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
T=new Timer();
T.scheduleAtFixedRate(new TimerTask() {
#Override
public void run() {
runOnUiThread(new Runnable()
{
#Override
public void run()
{
displayValue.setText("count="+count);
count++;
}
});
}
}, 0, 1);
textView1 = (TextView)findViewById(R.id.textView1);
textView2 = (TextView)findViewById(R.id.textView2);
textView3 = (TextView)findViewById(R.id.textView3);
textView4 = (TextView)findViewById(R.id.textView4);
displayValue = (TextView)findViewById(R.id.displayValue);
nameTxt = (EditText)findViewById(R.id.nameTxt);
button1 = (Button)findViewById(R.id.button1);
button1.setOnClickListener(this);
}
#Override
public void onClick(View v) {
T.cancel();
//Open popup or dialog or alert as per your choice and print the count value
//dialog.editext.setText(""+count);
final Dialog dialog = new Dialog(MainActivity.this);
dialog.setContentView(R.layout.custom_popup);
dialog.setTitle("Typing Result!");
// set the custom dialog components - text, image and button
TextView titletext = (TextView) dialog.findViewById(R.id.titletext);
//titletext.setText("Typing Result!");
titletext.setVisibility(View.GONE);
TextView text = (TextView) dialog.findViewById(R.id.text);
text.setText("Frankie Jones Igat, Your Typing Speed "+String.valueOf(count)+" miliseconds");
Button dialogButtonOK = (Button) dialog.findViewById(R.id.dialogButtonOK);
// if button is clicked, close the custom dialog
dialogButtonOK.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
dialog.dismiss();
}
});
dialog.show();
}
}
And Custom pop up layout in layout folder custom_popup.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#999999"
android:layout_marginTop="10dp">
<TextView
android:id="#+id/titletext"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="title"
android:textSize="18sp"
android:textColor="#android:color/black"/>
<TextView
android:id="#+id/text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/titletext"
android:layout_marginTop="5dp"
android:textSize="16sp"
android:text="titlekiefsjisejefsjeaij"
android:textColor="#android:color/black"
android:layout_centerHorizontal="true"
/>
<Button
android:id="#+id/dialogButtonOK"
android:layout_width="80dp"
android:layout_height="40dp"
android:text=" Ok "
android:layout_marginTop="10dp"
android:layout_marginRight="5dp"
android:layout_below="#+id/text"
android:textSize="18sp"
android:textColor="#android:color/black"
android:layout_centerHorizontal="true"
android:gravity="center"
android:background="#FF0000"
android:layout_marginBottom="10dp"
/>
</RelativeLayout>

I get a forcestop occasionally when I press buttons other than the first

I have 3 buttons in total. And it seemed that, if I don't press the first button, and instead second or third button right after I startup, my application will forcestop.
My code for part1 : http://pastebin.com/udkEdF3E
package project.ernest;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class Part1 extends Activity {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final Button a = (Button) findViewById(R.id.Disclaimer);
a.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent b = new Intent(getBaseContext(), Part2.class);
Part1.this.startActivity(b);
final Button c = (Button) findViewById(R.id.Orientation);
c.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent d = new Intent(getBaseContext(), Part3.class);
Part1.this.startActivity(d);
final Button e = (Button) findViewById(R.id.Course);
e.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent f = new Intent(getBaseContext(), Part4.class);
Part1.this.startActivity(f);
}
});
};
});
};
});
};
}
my code for main.xml : http://pastebin.com/SxfxfJ4a
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#color/myColor" android:weightSum="1">
<LinearLayout android:orientation="vertical" android:id="#+id/linearLayout1" android:weightSum="1" android:layout_width="wrap_content" android:layout_height="404dp">
<TextView android:text="#string/HospName" android:id="#+id/textView1" android:textSize="20mm" android:layout_width="324dp" android:layout_height="142dp"></TextView>
<Button android:text="#string/Disclaimer" android:layout_weight="0.37" android:textSize="5mm" android:layout_height="75dp" android:layout_width="fill_parent" android:id="#+id/Disclaimer" android:drawingCacheQuality="high" android:onClick="#string/DisclaimerHandler"></Button>
<Button android:text="#string/Orientation" android:textSize="5mm" android:layout_height="75dp" android:layout_weight="0.37" android:layout_width="fill_parent" android:id="#+id/Orientation" android:onClick="#string/OrientationHandler"></Button>
<Button android:text="#string/Course" android:textSize="5mm" android:layout_height="75dp" android:layout_weight="0.37" android:layout_width="fill_parent" android:id="#+id/Course" android:onClick="#string/CourseHandler"></Button>
</LinearLayout>
<LinearLayout android:layout_width="match_parent" android:orientation="horizontal" android:layout_weight="0.19" android:layout_height="wrap_content" android:id="#+id/linearLayout2" android:weightSum="1">
<Button android:layout_weight="0.23" android:text="#string/Search" android:textSize="1.9mm" android:layout_height="75dp" android:layout_width="75dp" android:onClick="#string/SearchHandler" android:id="#+id/Search"></Button>
<Button android:layout_weight="0.23" android:text="#string/Contact" android:textSize="1.9mm" android:layout_height="75dp" android:layout_width="75dp" android:onClick="#string/ContactHandler" android:id="#+id/Contact"></Button>
<Button android:onClick="#string/LinkHandler" android:layout_height="75dp" android:layout_width="75dp" android:layout_weight="0.23" android:textSize="1.9mm" android:text="#string/Link" android:id="#+id/Link"></Button>
<Button android:layout_weight="0.23" android:text="#string/Copyright" android:textSize="1.9mm" android:layout_height="75dp" android:layout_width="75dp" android:onClick="#string/CopyrightHandler" android:id="#+id/Copyright"></Button>
</LinearLayout>
</LinearLayout>
The error I get is either:
java.lang.IllegalStateException: Could not find a method CourseHandler(View) in activity class project.ernest.Part1 or...
java.lang.IllegalStateException: Could not find a method OrientationHandler(View) in activity class project.ernest.Part1 or...
Please help me out!

You've placed initialization of buttons 2 and 3 inside the first button's onClickListener(), means they won't be initialized before you click the first button. Fix your code.

this is the format.
public class Part1 extends Activity {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final Button a = (Button) findViewById(R.id.Disclaimer);
a.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent b = new Intent(getBaseContext(), Part2.class);
Part1.this.startActivity(b);
}
});
final Button c = (Button) findViewById(R.id.Orientation);
c.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent d = new Intent(getBaseContext(), Part3.class);
Part1.this.startActivity(d);
}
});
final Button e = (Button) findViewById(R.id.Course);
e.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent f = new Intent(getBaseContext(), Part4.class);
Part1.this.startActivity(f);
}
});
}
}