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POAndroid converting integer to string and string to integer
 

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    <p>I need that the each checkbox have own value like 1, 2 or 3, and u can check only 1 of first 3 checkboxes(cb1, cb2, cb3), and only 1 of second 3 checkboxes(cb4, cb5, cb6). But most imortant is to get summary of which checkboxes is cheked. App is crashing, what am I doing wrong? p.s. please excuse my bad English Here is the full source code:</p> <pre><code>public class MainActivity extends Activity { LinearLayout layout; Button bt; CheckBox cb1, cb2, cb3, cb4, cb5, cb6; TextView tv; String a, b, c; int d, e, f, g, h, i; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); layout = new LinearLayout(this); layout.setOrientation(LinearLayout.VERTICAL); cb1 = new CheckBox(this); cb2 = new CheckBox(this); cb3 = new CheckBox(this); cb4 = new CheckBox(this); cb5 = new CheckBox(this); cb6 = new CheckBox(this); bt = new Button(this); tv = new TextView(this); bt.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub a = ""; b = ""; c = ""; d = 1; e = 2; f = 3; if (cb1.isChecked()){ a = Integer.toString(d); }else if (cb2.isChecked()){ a = Integer.toString(e); }else if (cb3.isChecked()){ a = Integer.toString(f); }else if (cb4.isChecked()){ b = Integer.toString(d); }else if (cb5.isChecked()){ b = Integer.toString(e); }else if (cb6.isChecked()){ b = Integer.toString(f); } g = Integer.valueOf(a); h = Integer.valueOf(b); i = g+h; c = Integer.toString(i); tv.setText(c); } }); layout.addView(cb1); layout.addView(cb2); layout.addView(cb3); layout.addView(cb4); layout.addView(cb5); layout.addView(cb6); layout.addView(bt); layout.addView(tv); setContentView(layout); } } </code></pre> <hr> <pre><code>10-20 00:13:15.580: W/dalvikvm(2826): threadid=1: thread exiting with uncaught exception (group=0x40a71930) 10-20 00:13:15.700: E/AndroidRuntime(2826): FATAL EXCEPTION: main 10-20 00:13:15.700: E/AndroidRuntime(2826): java.lang.NullPointerException 10-20 00:13:15.700: E/AndroidRuntime(2826): at com.example.test.MainActivity$1.onClick(MainActivity.java:58) 10-20 00:13:15.700: E/AndroidRuntime(2826): at android.view.View.performClick(View.java:4204) 10-20 00:13:15.700: E/AndroidRuntime(2826): at android.view.View$PerformClick.run(View.java:17355) 10-20 00:13:15.700: E/AndroidRuntime(2826): at android.os.Handler.handleCallback(Handler.java:725) 10-20 00:13:15.700: E/AndroidRuntime(2826): at android.os.Handler.dispatchMessage(Handler.java:92) 10-20 00:13:15.700: E/AndroidRuntime(2826): at android.os.Looper.loop(Looper.java:137) 10-20 00:13:15.700: E/AndroidRuntime(2826): at android.app.ActivityThread.main(ActivityThread.java:5041) 10-20 00:13:15.700: E/AndroidRuntime(2826): at java.lang.reflect.Method.invokeNative(Native Method) 10-20 00:13:15.700: E/AndroidRuntime(2826): at java.lang.reflect.Method.invoke(Method.java:511) 10-20 00:13:15.700: E/AndroidRuntime(2826): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 10-20 00:13:15.700: E/AndroidRuntime(2826): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 10-20 00:13:15.700: E/AndroidRuntime(2826): at dalvik.system.NativeStart.main(Native Method) </code></pre>
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