Come risolvere NullPointerException

[Carontes]

Salve, sto cercando di fare un app in cui c'è una casella di ricerca, ho scritto il codice, ma quando provo a digitare la prima lettera nell' AutoCompleteTextView, mi da un errore (java.lang.NullPointerException) senza specificare che tipo di errore l'ha causato.

public class Search exten<span class="forTooltip">ds</span> Activity{<br /> AutoCompleteTextView acTV;<br /> ListView lview;<br /> <br /> String[] first = { "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine", "Ten"};<br /> <br /> String[] second = { "Uno", "Due", "Tre", "Quattro", "Cinque", "Sei", "Sette", "<span class="forTooltip">Ot</span>to", "Nove", "Dieci"};<br /> int textlength = 0;<br /> ArrayList<String> first_sort = new ArrayList<String>();<br /> ArrayList<String> second_sort = new ArrayList<String>();<br /> <br /> public void onCreate(Bundle savedInstanceState){<br /> super.onCreate(savedInstanceState);<br /> setContentView(R.layout.mains);<br /> <br /> acTV = (AutoCompleteTextView) findViewById(R.id.acTV);<br /> lview = (ListView) findViewById(R.id.list);<br /> lview.setAdapter(new MyCustomAdapter(first, second));<br /> <br /> lview.setClickable(true);<br /> lview.setOnItemClickListener(new OnItemClickListener() { <br /> public void onItemClick(AdapterView<?> adapter, View view, int position, long id){ <br /> <br /> Intent intent = new Intent(Search.this,Details.class);<br /> startActivity(intent);<br /> }<br /> {<br /> }});<br /> <br /> lview.setTextFilterEnabled(true);<br /> acTV.addTextChangedListener(new TextWatcher(){<br /> <br /> public void afterTextChanged(Editable s){<br /> }<br /> <br /> public void beforeTextChanged(CharSequence s, int start, int count, int after)<br /> {<br /> }<br /> <br /> public void onTextChanged(CharSequence s, int start,<br /> int before, int count)<br /> {<br /> <br /> textlength = acTV.getText().length();<br /> first_sort.clear();<br /> second_sort.clear();<br /> for (int i = 0; i < first.length; i++)<br /> {<br /> if (textlength <= first[i].length())<br /> {<br /> if (acTV.getText().toString().equalsIgnoreCase((String) first[i].subSequence(0, textlength)))<br /> {<br /> first_sort.add(first[i]);<br /> second_sort.add(first[i]);<br /> }<br /> }<br /> }<br /> <br /> lview.setAdapter(new MyCustomAdapter (first_sort, second_sort));<br /> <br /> }<br /> });<br /> }<br /> <br /> class MyCustomAdapter extends BaseAdapter{<br /> <br /> String[] data_first;<br /> String[] data_second;<br /> <br /> {<br /> <br /> }<br /> <br /> MyCustomAdapter(String[] first, String[] second){<br /> data_first = first;<br /> data_second = second;<br /> }<br /> <br /> MyCustomAdapter(ArrayList<String> first, ArrayList<String> second)<br /> {<br /> for(int i=0;i<first.size();i++)<br /> {<br /> data_first[i] = first.get(i);<br /> data_second[i] = second.get(i);<br /> }<br /> <br /> }<br /> <br /> public int getCount()<br /> {<br /> return data_first.length;<br /> }<br /> <br /> public String getItem(int position)<br /> {<br /> return null;<br /> }<br /> <br /> public long getItemId(int position)<br /> {<br /> return position;<br /> }<br /> <br /> public View getView(int position, View convertView, ViewGroup parent)<br /> {<br /> <br /> LayoutInflater inflater = getLayoutInflater();<br /> View row;<br /> <br /> row = inflater.inflate(R.layout.listitem_row, parent, false);<br /> <br /> TextView textview = (TextView) row.findViewById(R.id.textView1);<br /> TextView textview1 = (TextView) row.findViewById(R.id.textView2);<br /> <br /> textview.setText(data_first[position]);<br /> textview1.setText(data_second[position]);<br /> <br /> return (row);<br /> <br /> }<br /> }<br /> }

​x

 

1

public class Search extends Activity{

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AutoCompleteTextView acTV;

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ListView lview;

4

​

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String[] first = { "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight",     "Nine", "Ten"};

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​

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String[] second = { "Uno", "Due", "Tre", "Quattro", "Cinque", "Sei", "Sette", "Otto",  "Nove", "Dieci"};

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int textlength = 0;

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ArrayList<String> first_sort = new ArrayList<String>();

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ArrayList<String> second_sort = new ArrayList<String>();

11

​

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public void onCreate(Bundle savedInstanceState){

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super.onCreate(savedInstanceState);

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setContentView(R.layout.mains);

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​

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acTV = (AutoCompleteTextView) findViewById(R.id.acTV);

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lview = (ListView) findViewById(R.id.list);

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lview.setAdapter(new MyCustomAdapter(first, second));

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​

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lview.setClickable(true);

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lview.setOnItemClickListener(new OnItemClickListener() {  

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public void onItemClick(AdapterView<?> adapter, View view, int position, long id){  

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​

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        Intent intent = new Intent(Search.this,Details.class);

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        startActivity(intent);

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    }

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{

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}});

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​

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lview.setTextFilterEnabled(true);

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acTV.addTextChangedListener(new TextWatcher(){

32

​

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public void afterTextChanged(Editable s){

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}

35

​

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public void beforeTextChanged(CharSequence s, int start, int count, int after)

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{

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}

39

​

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public void onTextChanged(CharSequence s, int start,

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int before, int count)

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{

43

​

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textlength = acTV.getText().length();

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first_sort.clear();

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second_sort.clear();

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for (int i = 0; i < first.length; i++)

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{

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if (textlength <= first[i].length())

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{

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if (acTV.getText().toString().equalsIgnoreCase((String) first[i].subSequence(0, textlength)))

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{

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first_sort.add(first[i]);

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second_sort.add(first[i]);

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}

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}

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}

58

​

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lview.setAdapter(new MyCustomAdapter (first_sort, second_sort));

60

​

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}

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});

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}

64

​

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class MyCustomAdapter extends BaseAdapter{

66

​

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String[] data_first;

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String[] data_second;

69

​

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{

71

​

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}

73

​

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MyCustomAdapter(String[] first, String[] second){

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data_first = first;

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data_second = second;

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}

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​

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MyCustomAdapter(ArrayList<String> first, ArrayList<String> second)

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{

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for(int i=0;i<first.size();i++)

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{

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data_first[i] = first.get(i);

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data_second[i] = second.get(i);

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}

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​

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}

88

​

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public int getCount()

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{

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return data_first.length;

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}

93

​

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public String getItem(int position)

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{

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return null;

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}

98

​

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public long getItemId(int position)

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{

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return position;

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}

103

​

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public View getView(int position, View convertView, ViewGroup parent)

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{

106

​

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LayoutInflater inflater = getLayoutInflater();

108

View row;

109

​

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row = inflater.inflate(R.layout.listitem_row, parent, false);

111

​

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TextView textview = (TextView) row.findViewById(R.id.textView1);

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TextView textview1 = (TextView) row.findViewById(R.id.textView2);

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​

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textview.setText(data_first[position]);

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textview1.setText(data_second[position]);

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​

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return (row);

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​

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}

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}

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}

Questo è l'errore che mi da:

12-24 02:51:28.761: E/AndroidRuntime(15427): FATAL EXCEPTION: main<br /> 12-24 02:51:28.761: E/AndroidRuntime(15427): java.lang.NullPointerException<br /> 12-24 02:51:28.761: E/AndroidRuntime(15427): at it.gogle.com.Search$MyCustomAdapter.<init>(Search. java:111)<br /> 12-24 02:51:28.761: E/AndroidRuntime(15427): at it.gogle.com.Search$2.onTextChanged(Search.java:85 )<br /> 12-24 02:51:28.761: E/AndroidRuntime(15427): at android.widget.TextView.sendOnTextChanged(TextView .java:6240)<br /> 12-24 02:51:28.761: E/AndroidRuntime(15427): at android.widget.TextView.handleTextChanged(TextView .java:6281)<br /> 12-24 02:51:28.761: E/AndroidRuntime(15427): at android.widget.TextView$ChangeWatcher.onTextChange d(TextView.java:6456)<br /> 12-24 02:51:28.761: E/AndroidRuntime(15427): at android.text.SpannableStringBuilder.sendTextChange (SpannableStringBuilder.java:889)<br /> 12-24 02:51:28.761: E/AndroidRuntime(15427): at android.text.SpannableStringBuilder.change(Spannab leStringBuilder.java:352)<br /> 12-24 02:51:28.761: E/AndroidRuntime(15427): at android.text.SpannableStringBuilder.change(Spannab leStringBuilder.java:269)<br /> 12-24 02:51:28.761: E/AndroidRuntime(15427): at android.text.SpannableStringBuilder.replace(Spanna bleStringBuilder.java:432)<br /> 12-24 02:51:28.761: E/AndroidRuntime(15427): at android.text.SpannableStringBuilder.replace(Spanna bleStringBuilder.java:409)<br /> 12-24 02:51:28.761: E/AndroidRuntime(15427): at android.text.SpannableStringBuilder.replace(Spanna bleStringBuilder.java:28)<br /> 12-24 02:51:28.761: E/AndroidRuntime(15427): at android.view.inputmethod.BaseInputConnection.repla ceText(BaseInputConnection.java:583)<br /> 12-24 02:51:28.761: E/AndroidRuntime(15427): at android.view.inputmethod.BaseInputConnection.commi tText(BaseInputConnection.java:174)<br /> 12-24 02:51:28.761: E/AndroidRuntime(15427): at com.android.internal.widget.EditableInputConnectio n.commitText(EditableInputConnection.java:120)<br /> 12-24 02:51:28.761: E/AndroidRuntime(15427): at com.android.internal.view.IInputConnectionWrapper. executeMessage(IInputConnectionWrapper.java:247)<br /> 12-24 02:51:28.761: E/AndroidRuntime(15427): at com.android.internal.view.IInputConnectionWrapper$ MyHandler.handleMessage(IInputConnectionWrapper.ja va:73)<br /> 12-24 02:51:28.761: E/AndroidRuntime(15427): at android.os.Handler.dispatchMessage(Handler.java:99 )<br /> 12-24 02:51:28.761: E/AndroidRuntime(15427): at android.os.Lo<span class="forTooltip">op</span>er.lo<span class="forTooltip">op</span>(Looper.java:123)<br /> 12-24 02:51:28.761: E/AndroidRuntime(15427): at android.app.ActivityThread.main(ActivityThread.jav a:4627)<br /> 12-24 02:51:28.761: E/AndroidRuntime(15427): at java.lang.reflect.Method.invokeNative(Native Method)<br /> 12-24 02:51:28.761: E/AndroidRuntime(15427): at java.lang.reflect.Method.invoke(Method.java:521)<br /> 12-24 02:51:28.761: E/AndroidRuntime(15427): at com.android.internal.os.ZygoteInit$MethodAndArgsCa ller.run(ZygoteInit.java:858)<br /> 12-24 02:51:28.761: E/AndroidRuntime(15427): at com.android.internal.os.ZygoteInit.main(ZygoteInit .java:616)<br /> 12-24 02:51:28.761: E/AndroidRuntime(15427): at dalvik.system.NativeStart.main(Native Method)

26

 

1

12-24 02:51:28.761: E/AndroidRuntime(15427): FATAL EXCEPTION: main

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12-24 02:51:28.761: E/AndroidRuntime(15427): java.lang.NullPointerException

3

12-24 02:51:28.761: E/AndroidRuntime(15427):         at it.gogle.com.Search$MyCustomAdapter.<init>(Search.  java:111)

4

12-24 02:51:28.761: E/AndroidRuntime(15427):         at it.gogle.com.Search$2.onTextChanged(Search.java:85  )

5

12-24 02:51:28.761: E/AndroidRuntime(15427):         at android.widget.TextView.sendOnTextChanged(TextView  .java:6240)

6

12-24 02:51:28.761: E/AndroidRuntime(15427):         at android.widget.TextView.handleTextChanged(TextView  .java:6281)

7

12-24 02:51:28.761: E/AndroidRuntime(15427):         at android.widget.TextView$ChangeWatcher.onTextChange  d(TextView.java:6456)

8

12-24 02:51:28.761: E/AndroidRuntime(15427):         at android.text.SpannableStringBuilder.sendTextChange  (SpannableStringBuilder.java:889)

9

12-24 02:51:28.761: E/AndroidRuntime(15427):         at android.text.SpannableStringBuilder.change(Spannab  leStringBuilder.java:352)

10

12-24 02:51:28.761: E/AndroidRuntime(15427):         at android.text.SpannableStringBuilder.change(Spannab  leStringBuilder.java:269)

11

12-24 02:51:28.761: E/AndroidRuntime(15427):         at android.text.SpannableStringBuilder.replace(Spanna  bleStringBuilder.java:432)

12

12-24 02:51:28.761: E/AndroidRuntime(15427):         at android.text.SpannableStringBuilder.replace(Spanna  bleStringBuilder.java:409)

13

12-24 02:51:28.761: E/AndroidRuntime(15427):         at android.text.SpannableStringBuilder.replace(Spanna  bleStringBuilder.java:28)

14

12-24 02:51:28.761: E/AndroidRuntime(15427):         at android.view.inputmethod.BaseInputConnection.repla  ceText(BaseInputConnection.java:583)

15

12-24 02:51:28.761: E/AndroidRuntime(15427):         at android.view.inputmethod.BaseInputConnection.commi  tText(BaseInputConnection.java:174)

16

12-24 02:51:28.761: E/AndroidRuntime(15427):         at com.android.internal.widget.EditableInputConnectio  n.commitText(EditableInputConnection.java:120)

17

12-24 02:51:28.761: E/AndroidRuntime(15427):         at com.android.internal.view.IInputConnectionWrapper.  executeMessage(IInputConnectionWrapper.java:247)

18

12-24 02:51:28.761: E/AndroidRuntime(15427):         at com.android.internal.view.IInputConnectionWrapper$  MyHandler.handleMessage(IInputConnectionWrapper.ja  va:73)

19

12-24 02:51:28.761: E/AndroidRuntime(15427):         at android.os.Handler.dispatchMessage(Handler.java:99  )

20

12-24 02:51:28.761: E/AndroidRuntime(15427):         at android.os.Looper.loop(Looper.java:123)

21

12-24 02:51:28.761: E/AndroidRuntime(15427):         at android.app.ActivityThread.main(ActivityThread.jav  a:4627)

22

12-24 02:51:28.761: E/AndroidRuntime(15427):         at java.lang.reflect.Method.invokeNative(Native Method)

23

12-24 02:51:28.761: E/AndroidRuntime(15427):         at java.lang.reflect.Method.invoke(Method.java:521)

24

12-24 02:51:28.761: E/AndroidRuntime(15427):         at com.android.internal.os.ZygoteInit$MethodAndArgsCa  ller.run(ZygoteInit.java:858)

25

12-24 02:51:28.761: E/AndroidRuntime(15427):         at com.android.internal.os.ZygoteInit.main(ZygoteInit  .java:616)

26

12-24 02:51:28.761: E/AndroidRuntime(15427):         at dalvik.system.NativeStart.main(Native Method)

La riga incriminata è questa:
lview.setAdapter(new MyCustomAdapter (first_sort, second_sort));

1

 

1

lview.setAdapter(new MyCustomAdapter (first_sort, second_sort));

Come faccio a risolvere questo errore? Qualcuno saprebbe gentilmente aiutarmi? Grazie mille.