I don't see any initialization of barometricPressure (the EditText member variable).
-- Kostya Vasilyev -- http://kmansoft.wordpress.com 12.02.2011 1:34 пользователь "Kevsy" <[email protected]> написал: > I am getting a java.lang.NullPointerException error on line 41 > (setText) when I execute the following code. > > I have seen EditText boxes being set with this line before and I do > not understand what I am doing wrong. > > I have no experience with eclipse or java but I am trying to learn. > Please help! > > Code: > > package Psychrometric.Calculator; > > import android.app.Activity; > import android.app.AlertDialog; > import android.util.Log; > import android.view.View; > import android.view.View.OnClickListener; > import android.widget.Button; > import android.widget.EditText; > import android.widget.TextView; > import android.text.TextUtils; > import android.os.Bundle; > > public class Calculator extends Activity { > > private EditText altitude; > private EditText barometricPressure; > > /** Called when the activity is first created. */ > @Override > public void onCreate(Bundle savedInstanceState) { > super.onCreate(savedInstanceState); > setContentView(R.layout.main); > > Button calcButton = (Button) findViewById(R.id.calcButton); > > calcButton.setOnClickListener(new OnClickListener() { > public void onClick(View arg0) { > > altitude = (EditText) findViewById(R.id.altitude); > > > if (altitude.getText().length() != 0) > { > > double altitudeDouble = new > Double(altitude.getText().toString()); > > double barometricPressureDouble = 29.92 * > java.lang.Math.pow((1 - 0.0000068753 * altitudeDouble), 5.259); > > altitude.setText(Double.toString(altitudeDouble)); > > barometricPressure.setText(Double.toString(barometricPressureDouble)); > > } > > } > > }); > > } > > } > > XML: > <?xml version="1.0" encoding="utf-8"?> > > <ScrollView > xmlns:android="http://schemas.android.com/apk/res/android"; > android:id="@+id/ScrollView01" > android:layout_width="wrap_content" > android:layout_height="wrap_content" >> > > <TableLayout > android:id="@+id/widget27" > android:layout_width="320px" > android:layout_height="825px" > xmlns:android="http://schemas.android.com/apk/res/android"; > android:orientation="vertical" > android:stretchColumns="1" >> > > <TableRow > android:id="@+id/firstRow" > android:layout_width="fill_parent" > android:layout_height="75px" > xmlns:android="http://schemas.android.com/apk/res/android"; > android:orientation="horizontal" >> > > <Button > android:id="@+id/calcButton" > android:layout_width="185px" > android:layout_height="75px" > android:text="Calculate" >> > </Button> > </TableRow> > > <TableRow > android:id="@+id/widget45" > android:layout_width="fill_parent" > android:layout_height="50px" > xmlns:android="http://schemas.android.com/apk/res/android"; > android:orientation="horizontal" >> > > > <TextView > android:id="@+id/widget221" > android:layout_width="wrap_content" > android:layout_height="50px" > android:text="Altitude" >> > </TextView> > <EditText > android:id="@+id/altitude" > android:layout_width="wrap_content" > android:layout_height="50px" > android:textSize="18sp" > android:numeric="decimal" >> > </EditText> > <TextView > android:id="@+id/widget454" > android:layout_width="wrap_content" > android:layout_height="50px" > android:text="ft" >> > </TextView> > </TableRow> > <TableRow > android:id="@+id/widget32" > android:layout_width="fill_parent" > android:layout_height="50px" > xmlns:android="http://schemas.android.com/apk/res/android"; > android:orientation="horizontal" >> > <TextView > android:id="@+id/widget222" > android:layout_width="wrap_content" > android:layout_height="50px" > android:text="Barometric Pressure" >> > </TextView> > <EditText > android:id="@+id/barometricPressure" > android:layout_width="wrap_content" > android:layout_height="50px" > android:textSize="18sp" > android:numeric="decimal" >> > </EditText> > <TextView > android:id="@+id/widget455" > android:layout_width="wrap_content" > android:layout_height="50px" > android:text="in. Hg" >> > </TextView> > </TableRow> > </TableLayout> > </ScrollView> > > LogCat: > 02-11 12:49:02.334: DEBUG/AndroidRuntime(11161): Shutting down VM > 02-11 12:49:02.334: WARN/dalvikvm(11161): threadid=1: thread exiting > with uncaught exception (group=0x400259f8) > 02-11 12:49:02.394: ERROR/AndroidRuntime(11161): FATAL EXCEPTION: main > 02-11 12:49:02.394: ERROR/AndroidRuntime(11161): > java.lang.NullPointerException > 02-11 12:49:02.394: ERROR/AndroidRuntime(11161): at > Psychrometric.Calculator.Calculator$1.onClick(Calculator.java:41) > 02-11 12:49:02.394: ERROR/AndroidRuntime(11161): at > android.view.View.performClick(View.java:2408) > 02-11 12:49:02.394: ERROR/AndroidRuntime(11161): at > android.view.View$PerformClick.run(View.java:8817) > 02-11 12:49:02.394: ERROR/AndroidRuntime(11161): at > android.os.Handler.handleCallback(Handler.java:587) > 02-11 12:49:02.394: ERROR/AndroidRuntime(11161): at > android.os.Handler.dispatchMessage(Handler.java:92) > 02-11 12:49:02.394: ERROR/AndroidRuntime(11161): at > android.os.Looper.loop(Looper.java:144) > 02-11 12:49:02.394: ERROR/AndroidRuntime(11161): at > android.app.ActivityThread.main(ActivityThread.java:4937) > 02-11 12:49:02.394: ERROR/AndroidRuntime(11161): at > java.lang.reflect.Method.invokeNative(Native Method) > 02-11 12:49:02.394: ERROR/AndroidRuntime(11161): at > java.lang.reflect.Method.invoke(Method.java:521) > 02-11 12:49:02.394: ERROR/AndroidRuntime(11161): at > com.android.internal.os.ZygoteInit > $MethodAndArgsCaller.run(ZygoteInit.java:868) > 02-11 12:49:02.394: ERROR/AndroidRuntime(11161): at > com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) > 02-11 12:49:02.394: ERROR/AndroidRuntime(11161): at > dalvik.system.NativeStart.main(Native Method) > 02-11 12:49:02.404: WARN/ActivityManager(220): Force finishing > activity Psychrometric.Calculator/.Calculator > > -- > You received this message because you are subscribed to the Google > Groups "Android Developers" group. > To post to this group, send email to [email protected] > To unsubscribe from this group, send email to > [email protected] > For more options, visit this group at > http://groups.google.com/group/android-developers?hl=en -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
