在我的应用程序中，我想根据自动完成中输入的文本过滤名称和编号，但它返回我的空指针异常，我的应用程序关闭。我使用相同的适配器列表视图和autocompletetextview.how得到列表项以用户输入的文本开头。请提出建议....
MainActivity
public class MainActivity extends Activity implements OnItemClickListener,
OnItemSelectedListener {
SearchView mSearchView;
AutoCompleteTextView searchText;
ArrayList<String> name1 = new ArrayList<String>();
ArrayList<String> phno1 = new ArrayList<String>();
String[] cellArray = null;
String contacts;
static int check1;
ListView lv;
String phoneNumber, name;
StringBuilder b = new StringBuilder();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
ActionBar actionBar = getActionBar();
actionBar.setDisplayHomeAsUpEnabled(true);
ColorDrawable colorDrawable = new ColorDrawable(
Color.parseColor("#00aef0"));
actionBar.setBackgroundDrawable(colorDrawable);
setContentView(R.layout.get);
// mStatusView = (TextView) findViewById(R.id.text1);
getAllCallLogs(this.getContentResolver());
searchText = (AutoCompleteTextView) findViewById(R.id.autocomplete);
lv = (ListView) findViewById(R.id.lv);
ma = new MyAdapter();
searchText.setThreshold(1);
searchText.setAdapter(ma);
lv.setAdapter(ma);
lv.setOnItemClickListener(this);
lv.setItemsCanFocus(false);
lv.setTextFilterEnabled(true);
}
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// TODO Auto-generated method stub
switch (item.getItemId()) {
case android.R.id.home:
StringBuilder checkedcontacts = new StringBuilder();
System.out.println(".............." + ma.mCheckStates.size());
for (int i = 0; i < name1.size(); i++)
{
if (ma.mCheckStates.get(i) == true) {
// phno0.add(name1.get(i).toString());
phno0.add(phno1.get(i).toString());
checkedcontacts.append(name1.get(i).toString());
checkedcontacts.append("\n");
} else {
System.out.println("..Not Checked......"
+ name1.get(i).toString());
}
}
Intent returnIntent = new Intent();
returnIntent.putStringArrayListExtra("name", phno0);
setResult(RESULT_OK, returnIntent);
finish();
break;
case R.id.addPage:
break;
case R.id.action_search:
searchText.setVisibility(View.VISIBLE);
//String text_To_search= searchText.getText().toString().trim();
searchText.addTextChangedListener(new TextWatcher() {
public void onTextChanged(CharSequence s, int start, int before, int count) { // TODO Auto-generated method stub
ma.getFilter().filter(s);
}
@Override
public void afterTextChanged(Editable s) {
// TODO Auto-generated method stub
}
@Override
public void beforeTextChanged(CharSequence s, int start,
int count, int after) {
// TODO Auto-generated method stub
}
});
break;
}
return super.onOptionsItemSelected(item);
}
ma.toggle(position);
//
}
public void getAllCallLogs(ContentResolver cr) {
mPeopleList.clear();
Cursor phones = cr.query(
ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null, null,
null, ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME
+ " ASC");
while (phones.moveToNext()) {
phoneNumber = phones
.getString(phones
.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
name = phones
.getString(phones
.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
System.out.println(phoneNumber);
name1.add(name);
phno1.add(phoneNumber);
// meMap.put("name1","phno1");
// mPeopleList.add(name);
// mPeopleList.add(phoneNumber);
}
phones.close();
}
class MyAdapter extends BaseAdapter implements Filterable,
CompoundButton.OnCheckedChangeListener {
public SparseBooleanArray mCheckStates;
// public ListFilter listFilter;
LayoutInflater mInflater;
TextView tv1, tv;
CheckBox cb;
MyAdapter() {
mCheckStates = new SparseBooleanArray(name1.size());
mInflater = (LayoutInflater) MainActivity.this
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public View getView(final int position, View convertView,
ViewGroup parent) {
// TODO Auto-generated method stub
View vi = convertView;
if (convertView == null)
vi = mInflater.inflate(R.layout.row, null);
tv = (TextView) vi.findViewById(R.id.textView1);
tv1 = (TextView) vi.findViewById(R.id.textView2);
cb = (CheckBox) vi.findViewById(R.id.checkBox1);
tv.setText(name1.get(position));
tv1.setText(phno1.get(position));
cb.setTag(position);
cb.setChecked(mCheckStates.get(position, false));
cb.setOnCheckedChangeListener(this);
return vi;
}
public boolean isChecked(int position) {
return mCheckStates.get(position, false);
}
public void setChecked(int position, boolean isChecked) {
mCheckStates.put(position, isChecked);
}
public void toggle(int position) {
setChecked(position, !isChecked(position));
}
@Override
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
// TODO Auto-generated method stub
mCheckStates.put((Integer) buttonView.getTag(), isChecked);
}
@Override
public Filter getFilter() {
// TODO Auto-generated method stub
return null;
}
}
}
logcat的
04-01 14:29:36.318: E/AndroidRuntime(12166): FATAL EXCEPTION: main
04-01 14:29:36.318: E/AndroidRuntime(12166): java.lang.NullPointerException
04-01 14:29:36.318: E/AndroidRuntime(12166): at com.example.smscampaign.MainActivity$1.onTextChanged(MainActivity.java:193)
04-01 14:29:36.318: E/AndroidRuntime(12166): at android.widget.TextView.sendOnTextChanged(TextView.java:8366)
04-01 14:29:36.318: E/AndroidRuntime(12166): at android.widget.TextView.handleTextChanged(TextView.java:8428)
04-01 14:29:36.318: E/AndroidRuntime(12166): at android.widget.TextView$ChangeWatcher.onTextChanged(TextView.java:10367)
04-01 14:29:36.318: E/AndroidRuntime(12166): at android.text.SpannableStringBuilder.sendTextChanged(SpannableStringBuilder.java:962)
04-01 14:29:36.318: E/AndroidRuntime(12166): at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:496)
04-01 14:29:36.318: E/AndroidRuntime(12166): at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:435)
04-01 14:29:36.318: E/AndroidRuntime(12166): at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:30)
04-01 14:29:36.318: E/AndroidRuntime(12166): at android.view.inputmethod.BaseInputConnection.replaceText(BaseInputConnection.java:676)
04-01 14:29:36.318: E/AndroidRuntime(12166): at android.view.inputmethod.BaseInputConnection.setComposingText(BaseInputConnection.java:435)
04-01 14:29:36.318: E/AndroidRuntime(12166): at com.android.internal.view.IInputConnectionWrapper.executeMessage(IInputConnectionWrapper.java:333)
04-01 14:29:36.318: E/AndroidRuntime(12166): at com.android.internal.view.IInputConnectionWrapper$MyHandler.handleMessage(IInputConnectionWrapper.java:77)
04-01 14:29:36.318: E/AndroidRuntime(12166): at android.os.Handler.dispatchMessage(Handler.java:99)
04-01 14:29:36.318: E/AndroidRuntime(12166): at android.os.Looper.loop(Looper.java:137)
04-01 14:29:36.318: E/AndroidRuntime(12166): at android.app.ActivityThread.main(ActivityThread.java:5283)
04-01 14:29:36.318: E/AndroidRuntime(12166): at java.lang.reflect.Method.invokeNative(Native Method)
04-01 14:29:36.318: E/AndroidRuntime(12166): at java.lang.reflect.Method.invoke(Method.java:511)
04-01 14:29:36.318: E/AndroidRuntime(12166): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)
04-01 14:29:36.318: E/AndroidRuntime(12166): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)
04-01 14:29:36.318: E/AndroidRuntime(12166): at dalvik.system.NativeStart.main(Native Method)
答案 0 :(得分：0)
NPE：
ma.getFilter().filter(s);
并且您的getFilter()会返回null：
@Override
public Filter getFilter() {
// TODO Auto-generated method stub
return null;
}
所以在filter()上调用null会导致NPE。
您必须实际实施未实现的方法。