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POWhy do i keep getting a nullpointerexception?
 

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  1. POWhy do i keep getting a nullpointerexception?
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    <p>hello this might have been ask before but i couldnt find anything particular. when i go to run my program i come up with a nullpointer exception and program fails to run. im still kinda new to this and not sure where my problem lies.</p> <pre><code>public class MainActivity extends Activity implements OnClickListener { public ArrayList&lt;Short&gt; indexP = new ArrayList&lt;Short&gt;(); public ArrayList&lt;Float&gt; linep = new ArrayList&lt;Float&gt;(); public Float coords = (float) 0; public short p = 0; public TextView info = (TextView) findViewById(R.id.info); public int l = 0; GLSurfaceView ourSurface; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.cad); ourSurface = new GLSurfaceView(this); FrameLayout v = (FrameLayout) findViewById(R.id.display); v.addView(ourSurface); ourSurface.setRenderer(new GLRenderer()); Button line = (Button) findViewById(R.id.line); final Button enter = (Button) findViewById(R.id.enter); EditText cl = (EditText) findViewById(R.id.cl); final String value = cl.getText().toString(); try { coords = Float.parseFloat(value); } catch (NumberFormatException e) { } ; line.setOnClickListener(this); enter.setOnClickListener(this); enter.setOnClickListener(this); } public void onClick(View v) { switch (v.getId()) { case R.id.line: info.setText("Input X"); break; case R.id.enter: switch (l) { case (0): linep.add(coords); l++; break; case (1): linep.add(coords); indexP.add(p); l = 0; p++; } } } @Override protected void onPause() { // TODO Auto-generated method stub super.onPause(); } @Override protected void onResume() { // TODO Auto-generated method stub super.onResume(); } </code></pre> <p>}</p> <p>and heres the logcat info:</p> <pre><code>threadid=1: thread exiting with uncaught exception (group=0x40a961f8) FATAL EXCEPTION: main java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.linecad/com.example.linecad.MainActivity}: java.lang.NullPointerException at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1991) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2092) at android.app.ActivityThread.access$600(ActivityThread.java:126) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1172) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:137) at android.app.ActivityThread.main(ActivityThread.java:4586) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:511) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) at dalvik.system.NativeStart.main(Native Method) Caused by: java.lang.NullPointerException at android.app.Activity.findViewById(Activity.java:1840) at com.example.linecad.MainActivity.&lt;init&gt;(MainActivity.java:20) at java.lang.Class.newInstanceImpl(Native Method) at java.lang.Class.newInstance(Class.java:1319) at android.app.Instrumentation.newActivity(Instrumentation.java:1023) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1982) ... 11 more </code></pre>
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    1. USDavid Christo
    1. USDakota Miller
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