android - Buttons not working in calculator app

android - Buttons not working in calculator app - android

I have built a calculator app which uses EditTexts for you to insert the two values, and then I also have 4 Buttons each with an operation (eg.+,-,/,x). It seems though as if the buttons aren't doing its function assigned to it, No value is being sent to the TextView. Could you please help me in making those buttons do its operation?
Here is my code below:
package com.example.user.zidcalculator;
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 {
int enter1;
int enter2;
int newHeight;
EditText et1;
EditText et2;
TextView tv;
Button bt1;
Button bt2;
Button bt3;
Button bt4;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
et1 = (EditText) findViewById(R.id.edittext1);
et2 = (EditText) findViewById(R.id.edittext2);
tv = (TextView) findViewById(R.id.tvans);
bt1 = (Button) findViewById(R.id.button);
bt2 = (Button) findViewById(R.id.button2);
bt3 = (Button) findViewById(R.id.button3);
bt4 = (Button) findViewById(R.id.button4);
newHeight = et2.getHeight();
tv.setHeight(newHeight);
bt1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
enter1 = Integer.parseInt(et1.getText().toString());
enter2 = Integer.parseInt(et2.getText().toString());
int answer = enter1 + enter2;
tv.setText(String.valueOf(answer));
}
});
bt2.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
enter1 = Integer.parseInt(et1.getText().toString());
enter2 = Integer.parseInt(et2.getText().toString());
int answer = enter1 - enter2;
tv.setText(String.valueOf(answer));
}
});
bt3.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
enter1 = Integer.parseInt(et1.getText().toString());
enter2 = Integer.parseInt(et2.getText().toString());
int answer = enter1 * enter2;
tv.setText(String.valueOf(answer));
}
});
bt4.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
enter1 = Integer.parseInt(et1.getText().toString());
enter2 = Integer.parseInt(et2.getText().toString());
int answer = enter1 / enter2;
tv.setText(String.valueOf(answer));
}
});
}
}
Layout File
<?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:id="#+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_alignParentTop="true"
android:layout_alignParentStart="true"
android:layout_alignParentLeft="true">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Enter two numbers below and perform an operation to see the output"
android:gravity="center_horizontal"
android:textSize="20sp" />
<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="Enter first number here -->"
android:textSize="18sp" />
<EditText
android:id="#+id/edittext1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center_vertical|center_horizontal"
android:inputType="numberSigned"/>
</LinearLayout>
<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="Enter second number here -->"
android:textSize="18sp" />
<EditText
android:id="#+id/edittext2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center_vertical|center_horizontal"
android:inputType="numberSigned"/>
</LinearLayout>
<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="Answer -->"
android:textSize="18sp"
android:gravity="center_vertical|center_horizontal" />
<TextView
android:id="#+id/tvans"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center_horizontal" />
</LinearLayout>
</LinearLayout>
<Button
android:text="+"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/button"
android:layout_centerVertical="true"
android:layout_alignParentStart="true" />
<Button
android:text="-"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignTop="#+id/button"
android:layout_centerHorizontal="true"
android:id="#+id/button2" />
<Button
android:text="x"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/button"
android:layout_alignEnd="#+id/button"
android:layout_marginTop="39dp"
android:id="#+id/button3" />
<Button
android:text="/"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignTop="#+id/button3"
android:layout_alignStart="#+id/button2"
android:id="#+id/button4" />
</RelativeLayout>

When you getHeight of et2, it haven't text, so it height is 0. Then, you set height 0 for tv, you can't see it in screen althought it has text.

Try to run the code giving a constant height and width to answerTextView,tvans in your code(for eg: 30 DP height and 30 DP width).
This issue is not related to button. This is due to the invisibility of textView due to 0 height and width
<TextView
android:id="#+id/tvans"
android:layout_width="30dp"
android:layout_height="30dp"
android:gravity="center_horizontal"/>

I removed the Height variable newHeight and everything associated with it.

Related

Unable to retrieve values from buttons press in Android Calculator App

Currently trying to get my simple Android Calculator App working. When I try to run on an emulator I get:
java.lang.NullPointerException: Attempt to invoke virtual method 'android.text.Editable android.widget.EditText.getText()' on a null object reference
I'm also having an issue returning the result to the textview. I've tried tvResult.setText(result); but it isn't allowing me to pass in a float to the text.
My Java:
package com.example.justin.calculator;
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;
import javax.xml.transform.Result;
public class MainActivity extends Activity implements OnClickListener {
EditText digit1;
EditText digit2;
TextView tvResult;
Button nine, eight, seven, six, five, four, three, two, one, zero, decimal, plus, minus, divide, multiply, equals;
String s = "0";
char enterDigit = ' ';
String enterOperation;
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//button elements
nine = (Button) findViewById(R.id.button9);
eight = (Button) findViewById(R.id.button8);
seven = (Button) findViewById(R.id.button7);
six = (Button) findViewById(R.id.button6);
five = (Button) findViewById(R.id.button5);
four = (Button) findViewById(R.id.button4);
three = (Button) findViewById(R.id.button3);
two = (Button) findViewById(R.id.button2);
one = (Button) findViewById(R.id.button1);
zero = (Button) findViewById(R.id.button0);
decimal = (Button) findViewById(R.id.buttondecimal);
plus = (Button) findViewById(R.id.buttonadd);
minus = (Button) findViewById(R.id.buttonminus);
divide = (Button) findViewById(R.id.buttondivide);
multiply = (Button) findViewById(R.id.buttonmultiply);
equals = (Button) findViewById(R.id.buttonequals);
tvResult = (TextView) findViewById(R.id.tvResult);
//set listeners
nine.setOnClickListener(this);
eight.setOnClickListener(this);
seven.setOnClickListener(this);
six.setOnClickListener(this);
five.setOnClickListener(this);
four.setOnClickListener(this);
three.setOnClickListener(this);
two.setOnClickListener(this);
one.setOnClickListener(this);
decimal.setOnClickListener(this);
plus.setOnClickListener(this);
minus.setOnClickListener(this);
divide.setOnClickListener(this);
multiply.setOnClickListener(this);
equals.setOnClickListener(this);
tvResult.setOnClickListener(this);
}
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
float num1 = 0;
float num2 = 0;
float result = 0;
num1 = Float.parseFloat(digit1.getText().toString());
num2 = Float.parseFloat(digit2.getText().toString());
switch (v.getId()) {
case R.id.buttonadd:
enterOperation = "+";
result = num1 + num2;
break;
case R.id.buttonminus:
enterOperation = "-";
result = num1 - num2;
break;
case R.id.buttonmultiply:
enterOperation = "*";
result = num1 * num2;
break;
case R.id.buttondivide:
enterOperation = "/";
result = num1 / num2;
break;
default:
break;
}
}
}
My XML:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:id="#+id/tvResult"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="0"
android:gravity="right"
android:textSize="50sp"/>"
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_weight="1"
android:onClick="enterDigit">
<Button
android:id="#+id/button7"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_weight="1"
android:text="7"
android:onClick="enterDigit"/>
<Button
android:id="#+id/button8"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_weight="1"
android:text="8"
android:onClick="enterDigit"/>
<Button
android:id="#+id/button9"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_weight="1"
android:text="9"
android:onClick="enterDigit"/>"
<Button
android:id="#+id/buttondivide"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_weight="1"
android:text="/"
android:onClick="enterOperation"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_weight="1">
<Button
android:id="#+id/button4"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_weight="1"
android:text="4"
android:onClick="enterDigit"/>
<Button
android:id="#+id/button5"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_weight="1"
android:text="5"
android:onClick="enterDigit"/>
<Button
android:id="#+id/button6"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_weight="1"
android:text="6"
android:onClick="enterDigit"/>
<Button
android:id="#+id/buttonmultiply"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_weight="1"
android:text="*"
android:onClick="enterOperation"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_weight="1">
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_weight="1"
android:text="1"
android:onClick="enterDigit"/>
<Button
android:id="#+id/button2"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_weight="1"
android:text="2"
android:onClick="enterDigit"/>
<Button
android:id="#+id/button3"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_weight="1"
android:text="3"
android:onClick="enterDigit"/>
<Button
android:id="#+id/buttonminus"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_weight="1"
android:text="-"
android:onClick="enterOperation"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_weight="1">
<Button
android:id="#+id/button0"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_weight="1"
android:text="0"
android:onClick="enterDigit"/>
<Button
android:id="#+id/buttondecimal"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_weight="1"
android:text="." />
<Button
android:id="#+id/buttonequals"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_weight="1"
android:text="="
android:onClick="calculate"/>
<Button
android:id="#+id/buttonadd"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_weight="1"
android:text="+"
android:onClick="enterOperation"/>
</LinearLayout>
</LinearLayout>

Your EditText widgets do not exist in your xml. They need to be added in your main LinearLayout somewhere. Then, in your onCreate() method, you need to set them up via the findViewById(R.id.digit1)... Also, get rid of the onClick attribute in the LinearLayout; because your linearLayout is not clickable, it is useless.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<LinearLayout
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:orientation="horizontal>
<EditText
android:id="#+id/digit1"
android:layout_height="wrap_content"
android:layout_width="0dip"
android:layout_weight="1" />
<EditText
android:id="#+id/digit2"
android:layout_height="wrap_content"
android:layout_width="0dip"
android:layout_weight="1" />
</LinearLayout>
<TextView
android:id="#+id/tvResult"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="0"
android:gravity="right"
android:textSize="50sp"/>"
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_weight="1">
<Button
android:id="#+id/button7"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_weight="1"
android:text="7"
android:onClick="enterDigit"/>
...
then, in your activity...
#Override
public void onCreate(Bundle sIS){
super.onCreate(sIS);
digit1 = (EditText)findViewById(R.id.digit1);
digit2 = (EditText)findViewById(R.id.digit2);
...
}

you need to init your EditText (digit1 and digit1) firstlg as your buttons do, if not it will lead to NullPointException just like your proplem

An alert dialog with an image will appear once LinearLayout is clicked

Symptoms.java
package com.example.des;
import java.util.ArrayList;
import com.example.des.R;
import com.example.des.Symptoms;
import com.example.des.Learn_Dengue;
import android.os.Bundle;
import android.os.Handler;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Intent;
import android.view.Gravity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.Toast;
public class Symptoms extends Activity implements OnClickListener{
//set variables
CheckBox q1; CheckBox q2; CheckBox q3; CheckBox q4; CheckBox q5; CheckBox q6;
CheckBox q7; CheckBox q8; CheckBox q9 ;CheckBox q10; CheckBox q11; CheckBox q12;
LinearLayout sas1; LinearLayout sas2; LinearLayout sas3; LinearLayout sas4; LinearLayout sas5; LinearLayout sas6;
LinearLayout sas7; LinearLayout sas8; LinearLayout sas9; LinearLayout sas10; LinearLayout sas11; LinearLayout sas12;
Button btndone;
Button btnlearn;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.question);
q1 = (CheckBox)findViewById(R.id.q1a); //Question number 1--main symptom
q2 = (CheckBox)findViewById(R.id.q2a);
q3 = (CheckBox)findViewById(R.id.q3a);
q4 = (CheckBox)findViewById(R.id.q4a);
q5 = (CheckBox)findViewById(R.id.q5a);
q6 = (CheckBox)findViewById(R.id.q6a);
q7 = (CheckBox)findViewById(R.id.q7a);
q8 = (CheckBox)findViewById(R.id.q8a);
q9 = (CheckBox)findViewById(R.id.q9a);
q10 = (CheckBox)findViewById(R.id.q10a);
q11 = (CheckBox)findViewById(R.id.q11a);
q12 = (CheckBox)findViewById(R.id.q12a);
sas1 = (LinearLayout)findViewById(R.id.sas1view);
sas2 = (LinearLayout)findViewById(R.id.sas2view);
sas3 = (LinearLayout)findViewById(R.id.sas3view);
sas4 = (LinearLayout)findViewById(R.id.sas4view);
sas5 = (LinearLayout)findViewById(R.id.sas5view);
sas6 = (LinearLayout)findViewById(R.id.sas6view);
sas7 = (LinearLayout)findViewById(R.id.sas7view);
sas8 = (LinearLayout)findViewById(R.id.sas8view);
sas9 = (LinearLayout)findViewById(R.id.sas9view);
sas10 = (LinearLayout)findViewById(R.id.sas10view);
sas11 = (LinearLayout)findViewById(R.id.sas11view);
sas12 = (LinearLayout)findViewById(R.id.sas12view);
btndone = (Button) findViewById(R.id.done);
btndone.setOnClickListener(this);
btnlearn = (Button) findViewById(R.id.learn);
btnlearn.setOnClickListener(this);
}
#Override
public void onClick(View v) {
// When button "Result" is pressed
switch (v.getId()) {
case R.id.done:
ArrayList<CheckBox> cbList = new ArrayList<CheckBox>();
// Array CheckBox 2 - 12 inside an Array (sub symptoms)
cbList.add((CheckBox)findViewById(R.id.q2a));
cbList.add((CheckBox)findViewById(R.id.q3a));
cbList.add((CheckBox)findViewById(R.id.q4a));
cbList.add((CheckBox)findViewById(R.id.q5a));
cbList.add((CheckBox)findViewById(R.id.q6a));
cbList.add((CheckBox)findViewById(R.id.q7a));
cbList.add((CheckBox)findViewById(R.id.q8a));
cbList.add((CheckBox)findViewById(R.id.q9a));
cbList.add((CheckBox)findViewById(R.id.q10a));
cbList.add((CheckBox)findViewById(R.id.q11a));
cbList.add((CheckBox)findViewById(R.id.q12a));
// Starts Looping if CheckBox number 1 is selected and the others (result SUSPICIOUS)
if (q1.isChecked()) {
int count = 0;
for (CheckBox cb : cbList) {
if (cb.isChecked()) {
count++;
}
}
if (count == 2 || count == 1 || count == 0) {
new AlertDialog.Builder(this).setMessage(R.string.suspicious).show();
}
}
// START Looping if CheckBox number 1 is selected but 11 and 12 are not (result MOST LIKELY)
if (q1.isChecked()) {
int count = 0;
for (CheckBox cb : cbList) {
if (cb.isChecked()) {
count++;
}
}
if (count >= 3 && count < 11) {
new AlertDialog.Builder(this).setMessage(R.string.most_likely).show();
}
}
// START Looping if all CheckBox are selected(result POSITIVE)
if (q1.isChecked() && q2.isChecked() && q3.isChecked() && q4.isChecked() &&
q5.isChecked() && q6.isChecked() && q7.isChecked() && q8.isChecked() &&
q9.isChecked() && q10.isChecked() && q11.isChecked() && q12.isChecked()) {
int count = 0;
for (CheckBox cb : cbList) {
if (cb.isChecked()) {
count++;
}
}
if (count == 11) {
new AlertDialog.Builder(this).setMessage(R.string.positive).show();
}
}
// Starts Looping if CheckBox number 1 is not selected and the others are checked
if (!q1.isChecked()) {
int count = 0;
for (CheckBox cb : cbList) {
if (cb.isChecked()) {
count++;
}
}
if (count <= 1 || count > 1) {
//this Toast will show when only 1 or more check box will be checked(excluding check box #1)
/*Toast toast= Toast.makeText(getApplicationContext(), getString(R.string.negative), Toast.LENGTH_LONG);
toast.setGravity(Gravity.CENTER, 0, 0);
toast.show();
*/
new AlertDialog.Builder(this).setMessage(R.string.negative).show();
}
}
break;
// When button "Learn More" is pressed
case R.id.learn:
Intent q = new Intent(this, Learn_Dengue.class);
startActivity(q);
break;
}
Here start my question.
sas1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//Alert Dialog with image
}
});
sas2.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//Alert Dialog with image
}
});
sas3.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//Alert Dialog with image
}
});
sas4.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//Alert Dialog with image
}
});
sas5.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//Alert Dialog with image
}
});
sas6.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//Alert Dialog with image
}
});
sas7.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//Alert Dialog with image
}
});
sas8.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//Alert Dialog with image
}
});
sas9.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//Alert Dialog with image
}
});
sas10.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//Alert Dialog with image
}
});
sas11.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//Alert Dialog with image
}
});
sas12.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//Alert Dialog with image
}
});
}
}
questions.xml
<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/scrollView1"
style="#style/styleName"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<TextView
android:id="#+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/warning"
android:textAppearance="?android:attr/textAppearanceMedium" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<CheckBox
android:id="#+id/q1a"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<LinearLayout
android:layout_marginTop="15dp"
android:id="#+id/sas1view"
android:layout_width="match_parent"
android:layout_height="30dp" >
<TextView
android:id="#+id/sas1"
android:layout_width="wrap_content"
android:layout_height="30dp"
android:text="#string/sas1"
android:textAppearance="?android:attr/textAppearanceSmall"
android:textColor="#000000"
android:textSize="15sp"
android:textStyle="bold" />
</LinearLayout>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<CheckBox
android:id="#+id/q2a"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<LinearLayout
android:layout_marginTop="15dp"
android:id="#+id/sas2view"
android:layout_width="match_parent"
android:layout_height="30dp" >
<TextView
android:id="#+id/sas2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/sas2"
android:textAppearance="?android:attr/textAppearanceSmall"
android:textColor="#000000"
android:textSize="15sp"
android:textStyle="bold" />
</LinearLayout>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<CheckBox
android:id="#+id/q3a"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<LinearLayout
android:layout_marginTop="15dp"
android:id="#+id/sas3view"
android:layout_width="match_parent"
android:layout_height="30dp" >
<TextView
android:id="#+id/sas3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/sas3"
android:textAppearance="?android:attr/textAppearanceSmall"
android:textColor="#000000"
android:textSize="15sp"
android:textStyle="bold" />
</LinearLayout>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<CheckBox
android:id="#+id/q4a"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<LinearLayout
android:layout_marginTop="15dp"
android:id="#+id/sas4view"
android:layout_width="match_parent"
android:layout_height="30dp" >
<TextView
android:id="#+id/sas4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/sas4"
android:textAppearance="?android:attr/textAppearanceSmall"
android:textColor="#000000"
android:textSize="15sp"
android:textStyle="bold" />
</LinearLayout>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<CheckBox
android:id="#+id/q5a"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<LinearLayout
android:layout_marginTop="15dp"
android:id="#+id/sas5view"
android:layout_width="match_parent"
android:layout_height="30dp" >
<TextView
android:id="#+id/sas5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/sas5"
android:textAppearance="?android:attr/textAppearanceSmall"
android:textColor="#000000"
android:textSize="15sp"
android:textStyle="bold" />
</LinearLayout>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<CheckBox
android:id="#+id/q6a"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<LinearLayout
android:layout_marginTop="15dp"
android:id="#+id/sas6view"
android:layout_width="match_parent"
android:layout_height="30dp" >
<TextView
android:id="#+id/sas6"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/sas6"
android:textAppearance="?android:attr/textAppearanceSmall"
android:textColor="#000000"
android:textSize="15sp"
android:textStyle="bold" />
</LinearLayout>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<CheckBox
android:id="#+id/q7a"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<LinearLayout
android:layout_marginTop="15dp"
android:id="#+id/sas7view"
android:layout_width="match_parent"
android:layout_height="30dp" >
<TextView
android:id="#+id/sas7"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/sas7"
android:textAppearance="?android:attr/textAppearanceSmall"
android:textColor="#000000"
android:textSize="15sp"
android:textStyle="bold" />
</LinearLayout>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<CheckBox
android:id="#+id/q8a"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<LinearLayout
android:layout_marginTop="15dp"
android:id="#+id/sas8view"
android:layout_width="match_parent"
android:layout_height="30dp" >
<TextView
android:id="#+id/sas8"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/sas8"
android:textAppearance="?android:attr/textAppearanceSmall"
android:textColor="#000000"
android:textSize="15sp"
android:textStyle="bold" />
</LinearLayout>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<CheckBox
android:id="#+id/q9a"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<LinearLayout
android:layout_marginTop="15dp"
android:id="#+id/sas9view"
android:layout_width="match_parent"
android:layout_height="30dp" >
<TextView
android:id="#+id/sas9"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/sas9"
android:textAppearance="?android:attr/textAppearanceSmall"
android:textColor="#000000"
android:textSize="15sp"
android:textStyle="bold" />
</LinearLayout>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<CheckBox
android:id="#+id/q10a"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<LinearLayout
android:layout_marginTop="15dp"
android:id="#+id/sas10view"
android:layout_width="match_parent"
android:layout_height="30dp" >
<TextView
android:id="#+id/sas10"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/sas10"
android:textAppearance="?android:attr/textAppearanceSmall"
android:textColor="#000000"
android:textSize="15sp"
android:textStyle="bold" />
</LinearLayout>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<CheckBox
android:id="#+id/q11a"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<LinearLayout
android:layout_marginTop="15dp"
android:id="#+id/sas11view"
android:layout_width="match_parent"
android:layout_height="30dp" >
<TextView
android:id="#+id/sas11"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/sas11"
android:textAppearance="?android:attr/textAppearanceSmall"
android:textColor="#000000"
android:textSize="15sp"
android:textStyle="bold" />
</LinearLayout>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<CheckBox
android:id="#+id/q12a"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<LinearLayout
android:layout_marginTop="15dp"
android:id="#+id/sas12view"
android:layout_width="match_parent"
android:layout_height="30dp" >
<TextView
android:id="#+id/sas12"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/sas12"
android:textAppearance="?android:attr/textAppearanceSmall"
android:textColor="#000000"
android:textSize="15sp"
android:textStyle="bold" />
</LinearLayout>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="20dp" >
<Button
android:id="#+id/done"
android:layout_width="120dp"
android:layout_height="40dp"
android:layout_marginLeft="35dp"
android:layout_marginTop="20dp"
android:background="#drawable/btn_orange"
android:text="#string/done"
android:textColor="#ffffff"
android:textSize="15sp" />
<Button
android:id="#+id/learn"
android:layout_width="120dp"
android:layout_height="40dp"
android:layout_marginLeft="10dp"
android:layout_marginTop="20dp"
android:background="#drawable/btn_black"
android:text="#string/learn"
android:textColor="#ffffff"
android:textSize="15sp" />
</LinearLayout>
</LinearLayout>
</ScrollView>
here is my full code as you requested #mobie.. the Symptoms.java and the question.xml..dont matter the other code..just on the alert dialog that i asked.

Create Layout Like Below for Dialog Box : dialog.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" >
<ImageView
android:id="#+id/image"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="5dp" />
<TextView
android:id="#+id/text"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textColor="#FFF"
android:layout_toRightOf="#+id/image"/>
<Button
android:id="#+id/dialogButtonOK"
android:layout_width="100px"
android:layout_height="wrap_content"
android:text=" Ok "
android:layout_marginTop="5dp"
android:layout_marginRight="5dp"
android:layout_below="#+id/image"
/>
</RelativeLayout>
Then, Where you want to place the Alert, Do like below
final Dialog dialog = new Dialog(context);
dialog.setContentView(R.layout.dialog);
dialog.setTitle("Your Title");
TextView text = (TextView) dialog.findViewById(R.id.text);
text.setText("Text");
ImageView image = (ImageView) dialog.findViewById(R.id.image);
image.setImageResource(R.drawable.ic_launcher);
Button dialogButton = (Button) dialog.findViewById(R.id.dialogButtonOK);
dialogButton.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
dialog.dismiss();
}
});
dialog.show();

I clicked on my clear button and it doesn't work

THANK YOU FOR ALL OF YOUR HELP!! I NEED TO READ A TUTORIAL. :)
I know it's probably elementary and as you can tell I'm a newbie. I compared my code to others and don't see anything wrong. Thanks! When I click the clear Button after entering data, my edit fields are not cleared.
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button clear = (Button)findViewById(R.id.btn_clear);
clear.setOnClickListener(new View.OnClickListener() {
public void onClick(View v)
{
EditText potsize = (EditText) findViewById(R.id.et_pot_size);
EditText tocall = (EditText) findViewById(R.id.et_to_call);
EditText bepercent = (EditText) findViewById(R.id.et_be_per);
potsize.setText("");
tocall.setText("");
bepercent.setText("");
TextView potoddscalc = (TextView)findViewById(R.id.tv_pot_odds_calc);
potoddscalc.setText("5");
}
});
}
XML:
RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<requestFocus />
<TextView
android:id="#+id/tv_be_per"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/tv_to_call"
android:layout_below="#+id/tv_to_call"
android:layout_marginTop="34dp"
android:text="#string/BE_Per"
android:textStyle="bold" />
<TextView
android:id="#+id/tv_to_call"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/tv_pot_size"
android:layout_below="#+id/tv_pot_size"
android:layout_marginTop="33dp"
android:text="#string/to_call"
android:textStyle="bold" />
<TextView
android:id="#+id/tv_pot_size"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginTop="16dp"
android:text="#string/pot_size"
android:textStyle="bold" />
<TextView
android:id="#+id/tv_pot_odds_calc"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/et_be_per"
android:layout_alignTop="#+id/tv_pot_odds"
android:ems="8" />
<EditText
android:id="#+id/et_pot_size"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignTop="#+id/tv_pot_size"
android:layout_marginLeft="18dp"
android:layout_toRightOf="#+id/tv_pot_odds"
android:ems="10" />
<EditText
android:id="#+id/et_to_call"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/et_pot_size"
android:layout_alignTop="#+id/tv_to_call"
android:ems="10" />
<EditText
android:id="#+id/et_be_per"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/et_to_call"
android:layout_alignTop="#+id/tv_be_per"
android:ems="10" />
<TextView
android:id="#+id/tv_pot_odds"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/tv_be_per"
android:layout_below="#+id/et_be_per"
android:layout_marginTop="20dp"
android:text="#string/pot_odds"
android:textStyle="bold" />
<Button
android:id="#+id/btn_clear"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignRight="#+id/tv_pot_odds_calc"
android:layout_below="#+id/tv_pot_odds_calc"
android:layout_marginTop="24dp"
android:text="#string/clear_button" />
<Button
android:id="#+id/btn_calc"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/btn_clear"
android:layout_alignBottom="#+id/btn_clear"
android:layout_alignLeft="#+id/tv_pot_odds_calc"
android:text="#string/calc_button" />

Try this instead. I believe your problem may be arising from creating new EditTexts and TextView objects every time you click the clear button. In the below code, the EditTexts and TextView are declared only once ,in the OnCreate method. Also, getText().clear() is the "official" way of clearing the text from an EditText (not that it really makes a visual difference).
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button clear = (Button)findViewById(R.id.btn_clear);
EditText potsize = (EditText) findViewById(R.id.et_pot_size);
EditText tocall = (EditText) findViewById(R.id.et_to_call);
EditText bepercent = (EditText) findViewById(R.id.et_be_per);
TextView potoddscalc = (TextView)findViewById(R.id.tv_pot_odds_calc);
clear.setOnClickListener(new View.OnClickListener() {
public void onClick(View v)
{
potsize.getText().clear();
tocall.getText().clear();
bepercent.getText().clear();
potoddscalc.setText("5");
}
});
}

// try this way
<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="wrap_content"
android:padding="5dp"
android:orientation="vertical"
tools:context=".MainActivity" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp">
<TextView
android:id="#+id/tv_pot_size"
android:layout_width="0dp"
android:layout_weight="0.20"
android:gravity="right"
android:layout_height="wrap_content"
android:text="pot_size"
android:textStyle="bold" />
<EditText
android:id="#+id/et_pot_size"
android:layout_width="0dp"
android:layout_weight="0.80"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:ems="10" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp">
<TextView
android:id="#+id/tv_to_call"
android:layout_width="0dp"
android:layout_weight="0.20"
android:gravity="right"
android:layout_height="wrap_content"
android:text="to_call"
android:textStyle="bold" />
<EditText
android:id="#+id/et_to_call"
android:layout_width="0dp"
android:layout_weight="0.80"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:ems="10" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp">
<TextView
android:id="#+id/tv_be_per"
android:layout_width="0dp"
android:layout_weight="0.20"
android:gravity="right"
android:layout_height="wrap_content"
android:text="BE_Per"
android:textStyle="bold" />
<EditText
android:id="#+id/et_be_per"
android:layout_width="0dp"
android:layout_weight="0.80"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:ems="10" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:layout_marginTop="10dp">
<TextView
android:id="#+id/tv_pot_odds"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="pot_odds"
android:textStyle="bold" />
<TextView
android:id="#+id/tv_pot_odds_calc"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:ems="8" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:gravity="center">
<Button
android:id="#+id/btn_calc"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="calc_button" />
<Button
android:id="#+id/btn_clear"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:text="clear_button" />
</LinearLayout>
</LinearLayout>
public class MyActivity extends Activity {
private EditText potsize;
private EditText tocall;
private EditText bepercent;
private Button clear;
private Button calc;
private TextView potoddscalc;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
clear = (Button)findViewById(R.id.btn_clear);
calc = (Button)findViewById(R.id.btn_calc);
potsize = (EditText) findViewById(R.id.et_pot_size);
tocall = (EditText) findViewById(R.id.et_to_call);
bepercent = (EditText) findViewById(R.id.et_be_per);
potoddscalc = (TextView)findViewById(R.id.tv_pot_odds_calc);
clear.setOnClickListener(new View.OnClickListener() {
public void onClick(View v)
{
clearOrReset();
}
});
}
private void clearOrReset(){
potsize.setText("");
tocall.setText("");
bepercent.setText("");
potoddscalc.setText("5");
}
}

declare all three objects of Edittext in the oncreate method and then try it
enter code here #Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button clear = (Button)findViewById(R.id.btn_clear);
EditText potsize = (EditText) findViewById(R.id.et_pot_size);
EditText tocall = (EditText) findViewById(R.id.et_to_call);
EditText bepercent = (EditText) findViewById(R.id.et_be_per);
TextView potoddscalc = (TextView)findViewById(R.id.tv_pot_odds_calc);
public void onClick(View v)
{
swiech(v.getid())
{
case R.id.btn_clear:
potsize.setText("");
tocall.setText("");
bepercent.setText("");
potoddscalc.setText("5");
}
});
}

Button background not changed base on counter in android

I have made a very simple android program with help of 3 imagebuttons(circle) ,Now i want is after some clicks on that partcular buttons its background images should be changed..i have tried the code as below but its not working:
main.java
package com.esp.therisemethod.ui;
import com.esp.therisemethod.R;
import com.esp.therisemethod.uc.Header;
import com.esp.therisemethod.uc.Menu;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageView;
public class ProgressActivity extends Activity implements OnClickListener {
private ImageView resetall, undo, b1, b2, b3;
int cnt1,cnt2,cnt3;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
b1 = (ImageView) findViewById(R.id.b1);
b2 = (ImageView) findViewById(R.id.b2);
b3 = (ImageView) findViewById(R.id.b3);
resetall = (ImageView) findViewById(R.id.reset_all);
undo = (ImageView) findViewById(R.id.undo);
setContentView(R.layout.activity_progress);
Header header =(Header)findViewById(R.id.header);
header = (Header) findViewById(R.id.header);
b1.setOnClickListener(this);
b2.setOnClickListener(this);
b3.setOnClickListener(this);
header.btn_bak.setVisibility(View.VISIBLE);
header.btn_bak.setVisibility(View.VISIBLE);
Menu menu =(Menu)findViewById(R.id.prog_footer);
menu.setSelectedTab(1);
}
#Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.b1:
cnt1++;
if(cnt1>1 && cnt1<=5)
{
b1.setBackgroundResource(R.drawable.circle_red);
}
else if (cnt1>=6 && cnt1<10) {
b1.setBackgroundResource(R.drawable.circle_orange);
}
else{
b1.setBackgroundResource(R.drawable.circle_green);
}
break;
case R.id.b2:
cnt2++;
if(cnt2<=5)
{
b2.setImageResource(R.drawable.circle_red);
}
else if (cnt2>=6 && cnt2<10) {
b2.setImageResource(R.drawable.circle_orange);
}
else{
b2.setImageResource(R.drawable.circle_green);
}
break;
case R.id.b3:
cnt3++;
if(cnt3<=5)
{
b2.setImageResource(R.drawable.circle_red);
}
else if (cnt3>=6 && cnt3<10) {
b2.setImageResource(R.drawable.circle_orange);
}
else{
b2.setImageResource(R.drawable.circle_green);
}
break;
case R.id.reset_all:
break;
case R.id.undo:
break;
}
}
}
main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<com.esp.therisemethod.uc.Header
android:id="#+id/header"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
<ScrollView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center"
android:layout_below="#+id/header"
android:layout_above="#+id/prog_footer">
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
>
<LinearLayout
android:id="#+id/linearp1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/header"
android:orientation="vertical" >
<com.esp.therisemethod.uc.EspTextView
android:id="#+id/client_name"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:gravity="center"
android:tag="800"
android:text="Welcome Back SAM!"
android:textSize="25dp"
android:textStyle="bold" />
<com.esp.therisemethod.uc.EspTextView
android:id="#+id/make_choice"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:gravity="center"
android:tag="800"
android:text="Please make your choice:"
android:textSize="20dp" />
</LinearLayout>
<RelativeLayout
android:id="#+id/ralativep1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/linearp1"
android:layout_centerVertical="true"
android:layout_marginTop="10dp" >
<ImageView
android:id="#+id/b1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_marginLeft="20dp"
android:src="#drawable/cir_grey1" />
<ImageView
android:id="#+id/b2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_marginRight="20dp"
android:src="#drawable/cir_grey1" />
</RelativeLayout>
<ImageView
android:id="#+id/b3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/ralativep1"
android:layout_gravity="center_horizontal"
android:layout_marginTop="10dp"
android:src="#drawable/cir_grey1" />
<LinearLayout
android:id="#+id/linear2"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/b3"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:layout_marginTop="20dp"
android:layout_marginBottom="30dp"
android:weightSum="2" >
<Button
android:id="#+id/reset_all"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="5dp"
android:layout_weight="1"
android:background="#drawable/btn_med"
android:text="Reset all"
android:textColor="#ffffff" />
<Button
android:id="#+id/undo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="5dp"
android:layout_weight="1"
android:background="#drawable/btn_med"
android:text="Undo"
android:textColor="#ffffff" />
</LinearLayout>
</LinearLayout>
</ScrollView>
<com.esp.therisemethod.uc.Menu
android:id="#+id/prog_footer"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true" />
</RelativeLayout>

If you have set src attribute in xml, then to update UI use setImageResource()
If you have set background attribute in xml then to update UI use setImageDrawable()
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//First set content view..
setContentView(R.layout.activity_progress);
b1 = (ImageView) findViewById(R.id.b1);
b2 = (ImageView) findViewById(R.id.b2);
b3 = (ImageView) findViewById(R.id.b3);
resetall = (ImageView) findViewById(R.id.reset_all);
undo = (ImageView) findViewById(R.id.undo);
Header header =(Header)findViewById(R.id.header);

If Your onClickListener works correct, in Your case You have to change the source not background, for example:
b2.setImageResource(R.drawable.yourImage);

How to place 2 buttons at the same position in my layout

I have My Table row like below in my xml layout:
<TableRow
android:layout_marginTop="10dp"
>
<SeekBar
android:id="#+id/seekBar1"
android:layout_width="256dp"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/titlename"
android:layout_="#+id/playbtn"
android:layout_marginTop="4dp"
/>
<Button
android:id="#+id/playbtn"
android:layout_width="40dp"
android:layout_height="40dp"
android:layout_alignParentBottom="true"
android:background="#drawable/play"
android:layout_marginBottom="3dp"/>
<Button
android:id="#+id/pausebtn"
android:layout_width="40dp"
android:layout_height="40dp"
android:layout_toTopOf="#+id/playbtn"
android:layout_alignParentBottom="true"
android:background="#drawable/pause"
android:layout_marginBottom="3dp"/>
</TableRow>
and my output is as below,
my requirement is to show play pause buttons at the same position in my layout?
Could any one help?

Use FrameLayout and put one button over another
Like this
<FrameLayout ... >
<Button
android:id="#+id/playbtn"
android:layout_width="40dp"
android:layout_height="40dp"
android:background="#drawable/play"/>
<Button
android:id="#+id/pausebtn"
android:layout_width="40dp"
android:layout_height="40dp"
android:background="#drawable/pause"/>
</FrameLayout>
This will put Pause button over Play Button. Make the necessary button visible and invisible according to your need

Try using this layout. Use combination of LinearLayout and FrameLayout to achieve the desired result.
<TableRow
android:layout_marginTop="10dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<SeekBar
android:id="#+id/seekBar1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:weight="1"
android:layout_alignLeft="#+id/titlename"
android:layout_="#+id/playbtn"
android:layout_marginTop="4dp"
/>
<FrameLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<Button
android:id="#+id/playbtn"
android:layout_width="40dp"
android:layout_height="40dp"
android:background="#drawable/play"/>
<Button
android:id="#+id/pausebtn"
android:layout_width="40dp"
android:layout_height="40dp"
android:background="#drawable/pause"/>
</FrameLayout>
</LinearLayout>
</TableRow>

once Try this:
<TableRow
android:id="#+id/tableRow1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1" >
<SeekBar
android:id="#+id/seekBar1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight=".8" />
<Button
android:id="#+id/play"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight=".2"
/>
</TableRow>
Main Activity
private boolean playing = false;
Button play;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
play=(Button) findViewById(R.id.play);
play.setBackgroundResource(R.drawable.pause);
play.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
if(playing){
playing = false;
play.setBackgroundResource(R.drawable.pause);
}
else {
playing = true;
play.setBackgroundResource(R.drawable.play);
}
}
});
}

Why can't you try merge?
Have a glance of this.
http://android-developers.blogspot.in/2009/03/android-layout-tricks-3-optimize-by.html

You don't need to create two buttons for it. You can do it with single. I have created a sample program. I find this to be a cleaner approach.
Layout for MainActivity
<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"
android:gravity="center">
<Button
android:id="#+id/buttonPlayPause"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</LinearLayout>
Here is MainActivity
package in.live.homam.imagebuttonexample;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
public class MainActivity extends Activity {
private Button buttonPlayPause;
private static final int resourceIdPlay = R.drawable.play;
private static final int resourceIdPause = R.drawable.pause;
private int resourceIdButton = resourceIdPlay;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
buttonPlayPause = (Button) findViewById(R.id.buttonPlayPause);
buttonPlayPause.setBackgroundResource(resourceIdButton);
buttonPlayPause.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if(resourceIdButton == resourceIdPlay) {
resourceIdButton = resourceIdPause;
Log.d("Tag", "Playing");
}
else {
resourceIdButton = resourceIdPlay;
Log.d("Tag", "Paused");
}
buttonPlayPause.setBackgroundResource(resourceIdButton);
}
});
}
}

Develop Reference

The Android operating system is a mobile operating system that was developed by Google (GOOGL?) to be primarily used for touchscreen devices, cell phones, and tablets.

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