Question

I am trying to implement TextWatcher on EditText. I used an EditText in my app and watch it through TextWatcher.

When I type a alphabet like “a” in EditText bar my Cursor works but when I write next alphabet like “ab*” the cursor not works at all and on removing these letters errors occurred and my app crashes. I am unable to figure out what I am missing.

Here is my code:

TextWatcher myTextWatcher = new TextWatcher() {

    @Override
    public void onTextChanged(CharSequence s, int start, int before,
    int count) {

        if (start == 0) {


            SearchWordString.clear();

            Cursor cursor = managedQuery(DictionaryProvider.CONTENT_URI, null, null,
            new String[] {(search.getText().toString())}, null);



            while(cursor.isAfterLast()==false)
            {




                SearchWordString.add(cursor.getString(1)); 



                cursor.moveToNext();
            }



            listAdapter.notifyDataSetChanged();

            viewFlipper.showNext();
        } else {

        }

        listAdapter.notifyDataSetChanged();
    }

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

    }

    @Override
    public void afterTextChanged(Editable s) {





    }
};

And this is my LogCAT

01-15 04:54:25.080: W/dalvikvm(29324): threadid=1: thread exiting with uncaught exception (group=0x40b811f8)
01-15 04:54:25.103: E/AndroidRuntime(29324): FATAL EXCEPTION: main
01-15 04:54:25.103: E/AndroidRuntime(29324): java.lang.NullPointerException
01-15 04:54:25.103: E/AndroidRuntime(29324):    at com.ilmasoft.GPD.Start$2.onTextChanged(Start.java:1432)
01-15 04:54:25.103: E/AndroidRuntime(29324):    at android.widget.TextView.sendOnTextChanged(TextView.java:8085)
01-15 04:54:25.103: E/AndroidRuntime(29324):    at android.widget.TextView.handleTextChanged(TextView.java:8132)
01-15 04:54:25.103: E/AndroidRuntime(29324):    at android.widget.TextView$ChangeWatcher.onTextChanged(TextView.java:8495)
01-15 04:54:25.103: E/AndroidRuntime(29324):    at android.text.SpannableStringBuilder.sendTextChange(SpannableStringBuilder.java:892)
01-15 04:54:25.103: E/AndroidRuntime(29324):    at android.text.SpannableStringBuilder.change(SpannableStringBuilder.java:389)
01-15 04:54:25.103: E/AndroidRuntime(29324):    at android.text.SpannableStringBuilder.change(SpannableStringBuilder.java:266)
01-15 04:54:25.103: E/AndroidRuntime(29324):    at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:443)
01-15 04:54:25.103: E/AndroidRuntime(29324):    at android.text.SpannableStringBuilder.delete(SpannableStringBuilder.java:216)
01-15 04:54:25.103: E/AndroidRuntime(29324):    at android.text.SpannableStringBuilder.delete(SpannableStringBuilder.java:29)
01-15 04:54:25.103: E/AndroidRuntime(29324):    at android.text.method.BaseKeyListener.backspaceOrForwardDelete(BaseKeyListener.java:90)
01-15 04:54:25.103: E/AndroidRuntime(29324):    at android.text.method.BaseKeyListener.backspace(BaseKeyListener.java:45)
01-15 04:54:25.103: E/AndroidRuntime(29324):    at android.text.method.BaseKeyListener.onKeyDown(BaseKeyListener.java:151)
01-15 04:54:25.103: E/AndroidRuntime(29324):    at android.text.method.QwertyKeyListener.onKeyDown(QwertyKeyListener.java:352)
01-15 04:54:25.103: E/AndroidRuntime(29324):    at android.text.method.TextKeyListener.onKeyDown(TextKeyListener.java:132)
01-15 04:54:25.103: E/AndroidRuntime(29324):    at android.widget.TextView.doKeyDown(TextView.java:5716)
01-15 04:54:25.103: E/AndroidRuntime(29324):    at android.widget.TextView.onKeyDown(TextView.java:5531)
01-15 04:54:25.103: E/AndroidRuntime(29324):    at android.view.KeyEvent.dispatch(KeyEvent.java:2608)
01-15 04:54:25.103: E/AndroidRuntime(29324):    at android.view.View.dispatchKeyEvent(View.java:5547)
01-15 04:54:25.103: E/AndroidRuntime(29324):    at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1246)
01-15 04:54:25.103: E/AndroidRuntime(29324):    at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1246)
01-15 04:54:25.103: E/AndroidRuntime(29324):    at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1246)
01-15 04:54:25.103: E/AndroidRuntime(29324):    at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1246)
01-15 04:54:25.103: E/AndroidRuntime(29324):    at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchKeyEvent(PhoneWindow.java:2021)
01-15 04:54:25.103: E/AndroidRuntime(29324):    at com.android.internal.policy.impl.PhoneWindow.superDispatchKeyEvent(PhoneWindow.java:1382)
01-15 04:54:25.103: E/AndroidRuntime(29324):    at android.app.Activity.dispatchKeyEvent(Activity.java:2324)
01-15 04:54:25.103: E/AndroidRuntime(29324):    at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:1948)
01-15 04:54:25.103: E/AndroidRuntime(29324):    at android.view.ViewRootImpl.deliverKeyEventPostIme(ViewRootImpl.java:3360)
01-15 04:54:25.103: E/AndroidRuntime(29324):    at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2618)
01-15 04:54:25.103: E/AndroidRuntime(29324):    at android.os.Handler.dispatchMessage(Handler.java:99)
01-15 04:54:25.103: E/AndroidRuntime(29324):    at android.os.Looper.loop(Looper.java:137)
01-15 04:54:25.103: E/AndroidRuntime(29324):    at android.app.ActivityThread.main(ActivityThread.java:4511)
01-15 04:54:25.103: E/AndroidRuntime(29324):    at java.lang.reflect.Method.invokeNative(Native Method)
01-15 04:54:25.103: E/AndroidRuntime(29324):    at java.lang.reflect.Method.invoke(Method.java:511)
01-15 04:54:25.103: E/AndroidRuntime(29324):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:790)
01-15 04:54:25.103: E/AndroidRuntime(29324):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557)
01-15 04:54:25.103: E/AndroidRuntime(29324):    at dalvik.system.NativeStart.main(Native Method)

Answer 1

It is my understanding that start is the first point in s that there is a change. Try not doing a check to see if start is 0