I have absolutely no idea why I am getting a nullpointerexception here because almost this same exact code worked in a different program. I hope it's something simple.
Here is the logcat:
04-09 08:18:57.903: ERROR/AndroidRuntime(14378): java.lang.NullPointerException
04-09 08:18:57.903: ERROR/AndroidRuntime(14378): at com.prattia.webs.cheaterphysics.Vectors.storeInfo(Vectors.java:216)
04-09 08:18:57.903: ERROR/AndroidRuntime(14378): at com.prattia.webs.cheaterphysics.Vectors$2.onClick(Vectors.java:67)
04-09 08:18:57.903: ERROR/AndroidRuntime(14378): at android.view.View.performClick(View.java:2465)
04-09 08:18:57.903: ERROR/AndroidRuntime(14378): at android.view.View$PerformClick.run(View.java:8907)
04-09 08:18:57.903: ERROR/AndroidRuntime(14378): at android.os.Handler.handleCallback(Handler.java:587)
04-09 08:18:57.903: ERROR/AndroidRuntime(14378): at android.os.Handler.dispatchMessage(Handler.java:92)
04-09 08:18:57.903: ERROR/AndroidRuntime(14378): at android.os.Looper.loop(Looper.java:123)
Counter is as int initialized at 0 that keeps track of how many times next has been clicked in order to store vAnd here is part of the code with lines 67 and 216 marked:
next.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
error.setText("");
if(value.toString().length()==0||angle.toString().length()==0)
error.setText("Must enter both value and angle");
else{
storeInfo(); //67
counter++;
}
}
});
public void storeInfo(){
Doublify(value);
Doublify(angle);
//216 info[counter].value = Double.parseDouble(value.getText().toString());
info[counter].angle = Double.parseDouble(angle.getText().toString());
info[counter].radian = rad.isChecked();
if(q1.isChecked())
info[counter].quad=1;
if(q2.isChecked())
info[counter].quad=2;
if(q3.isChecked())
info[counter].quad=3;
if(q4.isChecked())
info[counter].quad=4;
angle.setText("");
value.setText("");
}
On line 64 you use toString
on the 'value' object which is likely to return the default implementation of the TextView toString()
and probably not a 0 length
value.toString()
but on line 216 you use the correct way to get the text value, and since you didn't test for it it is possible to be null:
value.getText().toString()
Change on line 64 to something like this:
if(value.getText() == null || value.getText().toString().length() == 0)
(and similar for the angle
value )
If JScoobyCed answer isnt the null pointer, then it might be the array.
info[counter].value // might be null because array's start at 0 not 1
maybe you want:
info[counter - 1].value
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