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Asked: 2026-06-16T12:48:40+00:00

I’m creating a simple android app, which has and editText field and a textView

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I’m creating a simple android app, which has and editText field and a textView field, the values within these fields are only numeric.

I have created a button which on selecting, I would like the value of the edit text and text view to be added together, I would then like the editText to change to a value of ‘0’ and teh total to be displayed in the textView.

For example if the editText has a value of 10 and the textView has a value of 20 on pressing the button the total of 30 is displayed in the textView and the value of the editText displays 0.

Here is my code so far, when I press the button at the moment the app crashes so I am not confident that I have coded correctly. I am new to java. Any help would be greatly appreciated.

public class durood extends Activity{

TextView txtCount;
TextView totalCount;
EditText enteramount;
Button btnCount;
Button addtotal1;
Button addtotal2;
Button cleartotal;
static int count=0;
double x=0;
double y=0;
double z=0;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// The activity is being created.
setContentView(R.layout.durood);

enteramount = (EditText)findViewById(R.id.enteramount);
totalCount = (TextView)findViewById(R.id.totalCount);
addtotal1=(Button)findViewById(R.id.addtototal1);
addtotal2=(Button)findViewById(R.id.addtototal2);


//add to total 1
addtotal1.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {

x=Double.parseDouble(enteramount.getText().toString());
y=Double.parseDouble(totalCount.getText().toString());
z=x+y;
totalCount.setText(Double.toString(z));
}


});

LogCat

12-30 23:52:11.098: W/Trace(615): Unexpected value from nativeGetEnabledTags: 0
12-30 23:52:11.129: E/ActivityThread(615): Service com.android.exchange.ExchangeService has leaked ServiceConnection com.android.emailcommon.service.ServiceProxy$ProxyConnection@40d332e8 that was originally bound here
12-30 23:52:11.129: E/ActivityThread(615): android.app.ServiceConnectionLeaked: Service com.android.exchange.ExchangeService has leaked ServiceConnection com.android.emailcommon.service.ServiceProxy$ProxyConnection@40d332e8 that was originally bound here
12-30 23:52:11.129: E/ActivityThread(615):  at android.app.LoadedApk$ServiceDispatcher.<init>(LoadedApk.java:969)
12-30 23:52:11.129: E/ActivityThread(615):  at android.app.LoadedApk.getServiceDispatcher(LoadedApk.java:863)
12-30 23:52:11.129: E/ActivityThread(615):  at android.app.ContextImpl.bindService(ContextImpl.java:1418)
12-30 23:52:11.129: E/ActivityThread(615):  at android.app.ContextImpl.bindService(ContextImpl.java:1407)
12-30 23:52:11.129: E/ActivityThread(615):  at android.content.ContextWrapper.bindService(ContextWrapper.java:473)
12-30 23:52:11.129: E/ActivityThread(615):  at com.android.emailcommon.service.ServiceProxy.setTask(ServiceProxy.java:157)
12-30 23:52:11.129: E/ActivityThread(615):  at com.android.emailcommon.service.ServiceProxy.setTask(ServiceProxy.java:145)
12-30 23:52:11.129: E/ActivityThread(615):  at com.android.emailcommon.service.AccountServiceProxy.getDeviceId(AccountServiceProxy.java:116)
12-30 23:52:11.129: E/ActivityThread(615):  at com.android.exchange.ExchangeService.getDeviceId(ExchangeService.java:1249)
12-30 23:52:11.129: E/ActivityThread(615):  at com.android.exchange.ExchangeService$7.run(ExchangeService.java:1856)
12-30 23:52:11.129: E/ActivityThread(615):  at com.android.emailcommon.utility.Utility$2.doInBackground(Utility.java:551)
12-30 23:52:11.129: E/ActivityThread(615):  at com.android.emailcommon.utility.Utility$2.doInBackground(Utility.java:549)
12-30 23:52:11.129: E/ActivityThread(615):  at android.os.AsyncTask$2.call(AsyncTask.java:287)
12-30 23:52:11.129: E/ActivityThread(615):  at java.util.concurrent.FutureTask.run(FutureTask.java:234)
12-30 23:52:11.129: E/ActivityThread(615):  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
12-30 23:52:11.129: E/ActivityThread(615):  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
12-30 23:52:11.129: E/ActivityThread(615):  at java.lang.Thread.run(Thread.java:856)
12-30 23:52:11.238: E/StrictMode(615): null
12-30 23:52:11.238: E/StrictMode(615): android.app.ServiceConnectionLeaked: Service com.android.exchange.ExchangeService has leaked ServiceConnection com.android.emailcommon.service.ServiceProxy$ProxyConnection@40d332e8 that was originally bound here
12-30 23:52:11.238: E/StrictMode(615):  at android.app.LoadedApk$ServiceDispatcher.<init>(LoadedApk.java:969)
12-30 23:52:11.238: E/StrictMode(615):  at android.app.LoadedApk.getServiceDispatcher(LoadedApk.java:863)
12-30 23:52:11.238: E/StrictMode(615):  at android.app.ContextImpl.bindService(ContextImpl.java:1418)
12-30 23:52:11.238: E/StrictMode(615):  at android.app.ContextImpl.bindService(ContextImpl.java:1407)
12-30 23:52:11.238: E/StrictMode(615):  at android.content.ContextWrapper.bindService(ContextWrapper.java:473)
12-30 23:52:11.238: E/StrictMode(615):  at com.android.emailcommon.service.ServiceProxy.setTask(ServiceProxy.java:157)
12-30 23:52:11.238: E/StrictMode(615):  at com.android.emailcommon.service.ServiceProxy.setTask(ServiceProxy.java:145)
12-30 23:52:11.238: E/StrictMode(615):  at com.android.emailcommon.service.AccountServiceProxy.getDeviceId(AccountServiceProxy.java:116)
12-30 23:52:11.238: E/StrictMode(615):  at com.android.exchange.ExchangeService.getDeviceId(ExchangeService.java:1249)
12-30 23:52:11.238: E/StrictMode(615):  at com.android.exchange.ExchangeService$7.run(ExchangeService.java:1856)
12-30 23:52:11.238: E/StrictMode(615):  at com.android.emailcommon.utility.Utility$2.doInBackground(Utility.java:551)
12-30 23:52:11.238: E/StrictMode(615):  at com.android.emailcommon.utility.Utility$2.doInBackground(Utility.java:549)
12-30 23:52:11.238: E/StrictMode(615):  at android.os.AsyncTask$2.call(AsyncTask.java:287)
12-30 23:52:11.238: E/StrictMode(615):  at java.util.concurrent.FutureTask.run(FutureTask.java:234)
12-30 23:52:11.238: E/StrictMode(615):  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
12-30 23:52:11.238: E/StrictMode(615):  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
12-30 23:52:11.238: E/StrictMode(615):  at java.lang.Thread.run(Thread.java:856)
12-30 23:52:11.272: W/ActivityManager(290): Unbind failed: could not find connection for android.os.BinderProxy@40fb7e78
12-30 23:52:11.328: E/ActivityThread(615): Service com.android.exchange.ExchangeService has leaked ServiceConnection com.android.emailcommon.service.ServiceProxy$ProxyConnection@40d32ef0 that was originally bound here
12-30 23:52:11.328: E/ActivityThread(615): android.app.ServiceConnectionLeaked: Service com.android.exchange.ExchangeService has leaked ServiceConnection com.android.emailcommon.service.ServiceProxy$ProxyConnection@40d32ef0 that was originally bound here
12-30 23:52:11.328: E/ActivityThread(615):  at android.app.LoadedApk$ServiceDispatcher.<init>(LoadedApk.java:969)
12-30 23:52:11.328: E/ActivityThread(615):  at android.app.LoadedApk.getServiceDispatcher(LoadedApk.java:863)
12-30 23:52:11.328: E/ActivityThread(615):  at android.app.ContextImpl.bindService(ContextImpl.java:1418)
12-30 23:52:11.328: E/ActivityThread(615):  at android.app.ContextImpl.bindService(ContextImpl.java:1407)
12-30 23:52:11.328: E/ActivityThread(615):  at android.content.ContextWrapper.bindService(ContextWrapper.java:473)
12-30 23:52:11.328: E/ActivityThread(615):  at com.android.emailcommon.service.ServiceProxy.setTask(ServiceProxy.java:157)
12-30 23:52:11.328: E/ActivityThread(615):  at com.android.emailcommon.service.ServiceProxy.setTask(ServiceProxy.java:145)
12-30 23:52:11.328: E/ActivityThread(615):  at com.android.emailcommon.service.ServiceProxy.test(ServiceProxy.java:191)
12-30 23:52:11.328: E/ActivityThread(615):  at com.android.exchange.ExchangeService$7.run(ExchangeService.java:1850)
12-30 23:52:11.328: E/ActivityThread(615):  at com.android.emailcommon.utility.Utility$2.doInBackground(Utility.java:551)
12-30 23:52:11.328: E/ActivityThread(615):  at com.android.emailcommon.utility.Utility$2.doInBackground(Utility.java:549)
12-30 23:52:11.328: E/ActivityThread(615):  at android.os.AsyncTask$2.call(AsyncTask.java:287)
12-30 23:52:11.328: E/ActivityThread(615):  at java.util.concurrent.FutureTask.run(FutureTask.java:234)
12-30 23:52:11.328: E/ActivityThread(615):  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
12-30 23:52:11.328: E/ActivityThread(615):  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
12-30 23:52:11.328: E/ActivityThread(615):  at java.lang.Thread.run(Thread.java:856)
12-30 23:52:11.398: E/StrictMode(615): null
12-30 23:52:11.398: E/StrictMode(615): android.app.ServiceConnectionLeaked: Service com.android.exchange.ExchangeService has leaked ServiceConnection com.android.emailcommon.service.ServiceProxy$ProxyConnection@40d32ef0 that was originally bound here
12-30 23:52:11.398: E/StrictMode(615):  at android.app.LoadedApk$ServiceDispatcher.<init>(LoadedApk.java:969)
12-30 23:52:11.398: E/StrictMode(615):  at android.app.LoadedApk.getServiceDispatcher(LoadedApk.java:863)
12-30 23:52:11.398: E/StrictMode(615):  at android.app.ContextImpl.bindService(ContextImpl.java:1418)
12-30 23:52:11.398: E/StrictMode(615):  at android.app.ContextImpl.bindService(ContextImpl.java:1407)
12-30 23:52:11.398: E/StrictMode(615):  at android.content.ContextWrapper.bindService(ContextWrapper.java:473)
12-30 23:52:11.398: E/StrictMode(615):  at com.android.emailcommon.service.ServiceProxy.setTask(ServiceProxy.java:157)
12-30 23:52:11.398: E/StrictMode(615):  at com.android.emailcommon.service.ServiceProxy.setTask(ServiceProxy.java:145)
12-30 23:52:11.398: E/StrictMode(615):  at com.android.emailcommon.service.ServiceProxy.test(ServiceProxy.java:191)
12-30 23:52:11.398: E/StrictMode(615):  at com.android.exchange.ExchangeService$7.run(ExchangeService.java:1850)
12-30 23:52:11.398: E/StrictMode(615):  at com.android.emailcommon.utility.Utility$2.doInBackground(Utility.java:551)
12-30 23:52:11.398: E/StrictMode(615):  at com.android.emailcommon.utility.Utility$2.doInBackground(Utility.java:549)
12-30 23:52:11.398: E/StrictMode(615):  at android.os.AsyncTask$2.call(AsyncTask.java:287)
12-30 23:52:11.398: E/StrictMode(615):  at java.util.concurrent.FutureTask.run(FutureTask.java:234)
12-30 23:52:11.398: E/StrictMode(615):  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
12-30 23:52:11.398: E/StrictMode(615):  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
12-30 23:52:11.398: E/StrictMode(615):  at java.lang.Thread.run(Thread.java:856)
12-30 23:52:11.448: W/ActivityManager(290): Unbind failed: could not find connection for android.os.BinderProxy@40f92598

XML:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:orientation="vertical" >

<LinearLayout
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal" >

 <Button
 android:id="@+id/dmute"
 style="?android:attr/buttonStyleSmall"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_marginLeft="3dp"
 android:minHeight="30dp"
 android:minWidth="48dp"
 android:text="Mute" />

 <Button
 android:id="@+id/dreset"
 style="?android:attr/buttonStyleSmall"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_marginLeft="198dp"
 android:minHeight="30dp"
 android:minWidth="48dp"
 android:text="Reset" />
</LinearLayout>

 <LinearLayout
 android:layout_width="fill_parent"
 android:layout_height="wrap_content"
 android:orientation="horizontal"
 android:paddingTop="20dp" >

 <TextView
 android:id="@+id/dcount"
 android:layout_width="0dip"
 android:layout_height="wrap_content"
 android:layout_weight="90"
 android:gravity="center"
 android:singleLine="true"
 android:text="Numbers"
 android:textSize="25sp" />

 <Button
 android:id="@+id/addtototal1"
 style="?android:attr/buttonStyleSmall"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_weight="5"
 android:text="+ to Total" />

  </LinearLayout>

  <LinearLayout
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:orientation="horizontal"
  android:paddingTop="20dp" >

  <EditText
  android:id="@+id/enteramount"
  android:layout_width="0dip"
  android:layout_height="wrap_content"
  android:layout_gravity="center"
  android:layout_weight="90"
  android:gravity="center"
  android:hint="Enter Amount"
  android:inputType="number"
  android:singleLine="true"
  android:textSize="25sp" />

  <Button
  android:id="@+id/addtototal2"
  style="?android:attr/buttonStyleSmall"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_weight="5"
  android:text="+ to Total" />

 </LinearLayout>

 <LinearLayout
 android:layout_width="fill_parent"
 android:layout_height="wrap_content"
 android:orientation="horizontal"
 android:paddingTop="20dp" >

 <TextView
 android:id="@+id/totalCount"
 android:layout_width="0dip"
 android:layout_height="wrap_content"
 android:layout_gravity="center"
 android:layout_weight="80"
 android:gravity="center"
 android:singleLine="true"
 android:textSize="25sp" />

  <Button
  android:id="@+id/cleartotal"
  style="?android:attr/buttonStyleSmall"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:text="Clear" />

 </LinearLayout>

  <Button
  android:id="@+id/dclick"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_gravity="center"
  android:layout_marginTop="30dp"
  android:height="120dp"
  android:width="250dp" />

</LinearLayout>
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1 Answer

  1. Editorial Team

    You have to initialize Your button addtotal1:

        addtotal1 = (Button)findViewById(R.id.yourButtonId);

    before You could set onClickListener.

    EDIT

    Your xml EditText has only the inputType “number”, so the user can´t put some decimal values. If You want it like this, You don´t need double variables. Instead of double, use int, so Your result is without showing decimal point:

           public class durood extends Activity{

         private TextView txtCount;
         private TextView totalCount;
         private EditText enteramount;
         private Button btnCount;
         private Button addtotal1;
         private Button addtotal2;
         private Button cleartotal;
         private static int count=0;
         private int x=0;
         private int y=0;
         private int z=0;

          @Override
           public void onCreate(Bundle savedInstanceState) {
           super.onCreate(savedInstanceState);
            // The activity is being created.
            setContentView(R.layout.durood);

            enteramount = (EditText)findViewById(R.id.enteramount);
            totalCount = (TextView)findViewById(R.id.totalCount);
            addtotal1=(Button)findViewById(R.id.addtototal1);
            addtotal2=(Button)findViewById(R.id.addtototal2);


            //add to total 1
            addtotal1.setOnClickListener(new View.OnClickListener() {
              public void onClick(View v) {

              x=Integer.parseInt(enteramount.getText().toString());
              y=Integer.parseInt(totalCount.getText().toString());
              z=x+y;
              totalCount.setText(Integer.toString(z));
              //to set value of enteramount to 0
              enteramount.setText("0"); //or enteramaount.setText("") if You want show nothing
            }


           });
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