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POJava - Android SDK - Unfrotunately <project name> has crashed error
 

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  1. POJava - Android SDK - Unfrotunately <project name> has crashed error
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    <p>I Have been working on a small app, which can calculate complex numbers for me (division, subtraction, multiplying etc.). I have no apparent compile errors, but when i run the program I get a bunch of run-time errors which I can't understand or know how to fix. Am i missing something obvious? This is my code: </p> <pre><code> package complex.OliverV; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.TextView; import android.widget.RadioButton; import android.widget.EditText; public class ComplexNumbersActivity extends Activity { Button Check; RadioButton plus, minus, multiply, div; EditText X1,X2,Y1,Y2; TextView Ans; int sign; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Check = (Button) findViewById(R.id.Check); plus = (RadioButton) findViewById(R.id.plus); minus = (RadioButton) findViewById(R.id.minus); multiply = (RadioButton) findViewById(R.id.multiply); div = (RadioButton) findViewById(R.id.div); Ans = (TextView) findViewById(R.id.Ans); plus.setOnClickListener(new View.OnClickListener(){ @Override public void onClick(View v) { // TODO Auto-generated method stub sign=1; } }); minus.setOnClickListener(new View.OnClickListener(){ @Override public void onClick(View v) { // TODO Auto-generated method stub sign=2; } }); multiply.setOnClickListener(new View.OnClickListener(){ @Override public void onClick(View v) { // TODO Auto-generated method stub sign=3; } }); div.setOnClickListener(new View.OnClickListener(){ @Override public void onClick(View v) { // TODO Auto-generated method stub sign=4; } }); Check.setOnClickListener(new View.OnClickListener(){ String xs=X1.getText().toString(); String xss=X2.getText().toString(); String ys=Y1.getText().toString(); String yss=Y2.getText().toString(); double x3,y3; @Override public void onClick(View v) { // TODO Auto-generated method stub if(xs!="" &amp;&amp; xss!="" &amp;&amp; ys!="" &amp;&amp; yss!="") { double x1=Double.parseDouble(xs); double x2=Double.parseDouble(xss); double y1=Double.parseDouble(ys); double y2=Double.parseDouble(yss); switch(sign) { case(1): { x3=x1+x2; y3=y1+y2; } case(2): { x3=x1-x2; y3=y1-y2; } case(3): { x3=(x1*x2-y1*y2); y3=(x2*y1 + x1*y2); } case(4): { if(x2!=0 &amp;&amp; y2!=0) { x3 = (x1 * x2 + y1 * y2) / (x2 * x2 + y2 * y2); y3 = (x2 * y1 - x1 * y2) / (x2 * x2 + y2 * y2); } else { Ans.setText("Enter valid numbers!"); } } } Ans.setText("x="+x3+"y="+y3); } else { Ans.setText("Enter valid numbers!"); } } }); } } </code></pre> <p>I am also adding a screenshot of the errors I get.<img src="https://i.stack.imgur.com/Jlxq8.png" alt="Errors"> Im putting an image, because copying the text looks like a mess. Sorry for the long question and thank you to anyone who can take the time to help me out, I am very grateful for every bit of help. :)</p>
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    1. USOliver
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    1. COthat line you have selected in your screenshot (under caused by) contains the line number of where you NullPointerException is happening. Unfortunately, it is clipped off
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      1. POJava - Android SDK - Unfrotunately <project name> has crashed error
      1. USpetey
    2. COThe important part is the "Caused by" then an exception type, followed by the stack trace. Start at the top, then go down until you find the first line that's in your program. This is where you have a bug. In this case you have a NullPointerException somewhere in onCreate. Unfortunately I can't read more because you pasted an image rather than copy pasted the text.
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      1. POJava - Android SDK - Unfrotunately <project name> has crashed error
      1. USGabe Sechan
    3. COCompiler errors and runtime errors are totally unconnected, since you cannot get the latter without fixing the former.
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      1. POJava - Android SDK - Unfrotunately <project name> has crashed error
      1. USSimon
 

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