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POAndroid ListView with 2 TextViews and 1 Button
 

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  1. POAndroid ListView with 2 TextViews and 1 Button
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    <p>I'm trying to create a ListView with 2 TextViews and 1 Button. When the users click in the button the activity will finish(); and pass the result to another view. I followed <a href="http://techdroid.kbeanie.com/2009/07/custom-listview-for-android.html" rel="nofollow">this tutorial </a>. But for some reason when i click to start that activity my application crashes! Here is the 3 files from my app that are relevant. </p> <p>List Structure Data:</p> <pre><code>public class formulasListData { private String formulasName; private String formulasDefinition; public formulasListData(String formulasName, String formulasDefinition) { super(); this.formulasName = formulasName; this.formulasDefinition = formulasDefinition; } public String getFormulasName() { return formulasName; } public void setFormulasName(String formulasName) { this.formulasName = formulasName; } public String getFormulasDefinition() { return formulasDefinition; } public void setFormulasDefinition(String formulasDefinition) { this.formulasDefinition = formulasDefinition; } } </code></pre> <p>The List Adapter:</p> <pre><code>public class formulasListAdapter extends BaseAdapter implements OnClickListener { private Context context; private List&lt;formulasListData&gt; formulasList; public formulasListAdapter(Context context, List&lt;formulasListData&gt; formulasList) { this.context = context; this.formulasList = formulasList; } @Override public int getCount() { return formulasList.size(); } @Override public Object getItem(int position) { return formulasList.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View rowView, ViewGroup parent) { formulasListData entry = formulasList.get(position); if(rowView == null) { LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); rowView = inflater.inflate(R.layout.formulas_row, null); } TextView formulasName = (TextView) rowView.findViewById(R.id.formulas_name); formulasName.setText(entry.getFormulasName()); TextView formulasDefinition = (TextView) rowView.findViewById(R.id.formulas_definition); formulasDefinition.setText(entry.getFormulasDefinition()); Button btnSelect = (Button) rowView.findViewById(R.id.selectFormula); btnSelect.setFocusableInTouchMode(false); btnSelect.setFocusable(false); btnSelect.setOnClickListener(this); btnSelect.setTag(entry); return rowView; } @Override public void onClick(View view) { formulasListData entry = (formulasListData) view.getTag(); } } </code></pre> <p>And the activity that should display the list.</p> <pre><code>public class FormulasList extends Activity { private static final int FORMULA_0 = 0; private static final int FORMULA_1 = 1; private static final int FORMULA_2 = 2; private static final int FORMULA_3 = 3; private static final int FORMULA_4 = 4; private static final int FORMULA_5 = 5; private static final int FORMULA_6 = 6; // private static final int FORMULA_7 = 7; public void onCreate(Bundle savedInstance) { super.onCreate(savedInstance); ListView formulasListView = (ListView) findViewById(R.id.formulas_list); formulasListView.setClickable(true); final List&lt;formulasListData&gt; formulasList = new ArrayList&lt;formulasListData&gt;(); final String[] formulasName = new String[] {"Circunference of a Circle:", "Area of a Circle:", "Volume of a Sphere:", "Area Triangle:", "Area Square:", "Volume of a Cube:", "Pithagorean Theorem:"}; final String[] formulasDefinition = new String[] {"2 × π × r", "π × r²", "(4/3) × π × r³", "(b × h)/2", "side²", "side³", "a² + b² = c²"}; // formulasList.add(new formulasListData(formulasName, formulasDefinition)); formulasList.add(new formulasListData(formulasName[0], formulasDefinition[0])); formulasList.add(new formulasListData(formulasName[1], formulasDefinition[1])); formulasList.add(new formulasListData(formulasName[2], formulasDefinition[2])); formulasList.add(new formulasListData(formulasName[3], formulasDefinition[3])); formulasList.add(new formulasListData(formulasName[4], formulasDefinition[4])); formulasList.add(new formulasListData(formulasName[5], formulasDefinition[5])); formulasList.add(new formulasListData(formulasName[6], formulasDefinition[6])); SharedPreferences settings = getSharedPreferences(SettingsActivity.PREF_NAME, MODE_PRIVATE); SettingsActivity.newTheme = settings.getInt("themeCustom", 0); if(SettingsActivity.newTheme == SettingsActivity.THEME_DARK) { setTheme(R.style.DarkTheme); } else if(SettingsActivity.newTheme == SettingsActivity.THEME_LIGHT){ setTheme(R.style.LightTheme); } else if(SettingsActivity.newTheme == SettingsActivity.THEME_COLORS) { setTheme(R.style.ColorsTheme); } else { setTheme(R.style.AppTheme); } setContentView(R.layout.activity_formulas); formulasListAdapter adapter = new formulasListAdapter(this, formulasList); formulasListView.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView&lt;?&gt; arg0, View view, int position,long index) { Intent intent= getIntent(); Bundle b = new Bundle(); switch (position) { case FORMULA_0: b.putString("key0", formulasDefinition[0]); intent.putExtras(b); setResult(RESULT_OK, intent); finish(); break; case FORMULA_1: b.putString("key0", formulasDefinition[1]); intent.putExtras(b); setResult(RESULT_OK, intent); finish(); break; case FORMULA_2: b.putString("key0", formulasDefinition[2]); intent.putExtras(b); setResult(RESULT_OK, intent); finish(); break; case FORMULA_3: b.putString("key0", formulasDefinition[3]); intent.putExtras(b); setResult(RESULT_OK, intent); finish(); break; case FORMULA_4: b.putString("key0", formulasDefinition[4]); intent.putExtras(b); setResult(RESULT_OK, intent); finish(); break; case FORMULA_5: b.putString("key0", formulasDefinition[5]); intent.putExtras(b); setResult(RESULT_OK, intent); finish(); break; case FORMULA_6: b.putString("key0", formulasDefinition[6]); intent.putExtras(b); setResult(RESULT_OK, intent); finish(); break; default: break; } } }); formulasListView.setAdapter(adapter); } } </code></pre> <p>Thank you very much!! </p> <p>EDIT: Here is the LogCat</p> <pre><code>05-01 20:06:54.436: D/libEGL(4820): loaded /system/lib/egl/libEGL_tegra.so 05-01 20:06:54.456: D/libEGL(4820): loaded /system/lib/egl/libGLESv1_CM_tegra.so 05-01 20:06:54.466: D/libEGL(4820): loaded /system/lib/egl/libGLESv2_tegra.so 05-01 20:06:54.486: D/OpenGLRenderer(4820): Enabling debug mode 0 05-01 20:06:54.536: D/dalvikvm(4820): GC_CONCURRENT freed 170K, 4% free 7509K/7808K, paused 4ms+10ms, total 38ms 05-01 20:06:59.976: D/AndroidRuntime(4820): Shutting down VM 05-01 20:06:59.976: W/dalvikvm(4820): threadid=1: thread exiting with uncaught exception (group=0x40cde930) 05-01 20:06:59.976: E/AndroidRuntime(4820): FATAL EXCEPTION: main 05-01 20:06:59.976: E/AndroidRuntime(4820): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.gabilheri.marcuscalculatorv2/com.gabilheri.marcuscalculatorv2.FormulasList}: java.lang.NullPointerException 05-01 20:06:59.976: E/AndroidRuntime(4820): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180) 05-01 20:06:59.976: E/AndroidRuntime(4820): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230) 05-01 20:06:59.976: E/AndroidRuntime(4820): at android.app.ActivityThread.access$600(ActivityThread.java:141) 05-01 20:06:59.976: E/AndroidRuntime(4820): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234) 05-01 20:06:59.976: E/AndroidRuntime(4820): at android.os.Handler.dispatchMessage(Handler.java:99) 05-01 20:06:59.976: E/AndroidRuntime(4820): at android.os.Looper.loop(Looper.java:137) 05-01 20:06:59.976: E/AndroidRuntime(4820): at android.app.ActivityThread.main(ActivityThread.java:5041) 05-01 20:06:59.976: E/AndroidRuntime(4820): at java.lang.reflect.Method.invokeNative(Native Method) 05-01 20:06:59.976: E/AndroidRuntime(4820): at java.lang.reflect.Method.invoke(Method.java:511) 05-01 20:06:59.976: E/AndroidRuntime(4820): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 05-01 20:06:59.976: E/AndroidRuntime(4820): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 05-01 20:06:59.976: E/AndroidRuntime(4820): at dalvik.system.NativeStart.main(Native Method) 05-01 20:06:59.976: E/AndroidRuntime(4820): Caused by: java.lang.NullPointerException 05-01 20:06:59.976: E/AndroidRuntime(4820): at com.gabilheri.marcuscalculatorv2.FormulasList.onCreate(FormulasList.java:30) 05-01 20:06:59.976: E/AndroidRuntime(4820): at android.app.Activity.performCreate(Activity.java:5104) 05-01 20:06:59.976: E/AndroidRuntime(4820): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080) 05-01 20:06:59.976: E/AndroidRuntime(4820): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144) 05-01 20:06:59.976: E/AndroidRuntime(4820): ... 11 more </code></pre>
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    1. PO
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    1. PTQuestion
    1. USMarcus Gabilheri
    1. USMarcus Gabilheri
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
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    1. This table or related slice is empty.
    1. COCan we have the logcat printout, to know why the application is crashing
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      1. POAndroid ListView with 2 TextViews and 1 Button
      1. USbrendosthoughts
    2. COEdited with the logcat
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      1. POAndroid ListView with 2 TextViews and 1 Button
      1. USMarcus Gabilheri
 

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