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POonTextChanged android NullPointerException
 

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  1. POonTextChanged android NullPointerException
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    <p>I am writing an android application, but I am getting onTextChanged error, my application is currency converter, when I want to enter the amount of money on the text, the application crashes.</p> <p>here is my code :</p> <pre><code>public class Currency_convert extends Activity { /** Called when the activity is first created. */ float inputValue; Handler h; static int decimalsize = 2; public DecimalFormat df = new DecimalFormat(); String US = "USD";//us dollar String EURO = "EUR"; String INR = "INR";//Indian rupee String AUD = "AUD";//australian dollar String GBP = "GBP";//Pound sterling String ILS = "ILS"; String TRY = "TRY"; String RUB = "RUB"; String JPY = "JPY"; String MYR = "MYR"; public Double dUS;// = 0.0; public Double dEURO;// = 1.0; public Double dINR;// = 0.0; public Double dAUD;// = 0.0; public Double dGBP;// = 0.0; public Double dILS;// = 0.0; public Double dTRY; public Double dRUB; public Double dJPY; public Double dMYR; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.currency); // setHeader(getString(R.string.currency), true); boolean rateupdate = false; AbsoluteLayout al = (AbsoluteLayout) findViewById(R.id.AbsoluteLayout01); al.setBackgroundColor(Color.LTGRAY);// final EditText amount = (EditText) findViewById(R.id.txt1); final EditText etResult = (EditText) findViewById(R.id.txt2); final Spinner sp1=(Spinner) findViewById(R.id.spinerr1); final Spinner sp2=(Spinner) findViewById(R.id.spinerr2); final InputMethodManager imm = (InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE); ArrayAdapter adapter = ArrayAdapter.createFromResource(this, R.array.currency, android.R.layout.simple_spinner_item); final Button btn = (Button) findViewById(R.id.bb1); amount.setText("0.0"); adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); sp1.setAdapter(adapter); sp2.setAdapter(adapter); rateupdate = getRate(); if(rateupdate) btn.setText("Currency Rate updated"); else btn.setText("Updated Currency Rate "); //btn.setText(Boolean.toString(rateupdate)); OnClickListener ltouch = new OnClickListener() { public void onClick(View v) { // TODO Auto-generated method stub //getRate(); } };;; btn.setOnClickListener(ltouch ); OnItemClickListener itemClick = new OnItemClickListener() { @Override public void onItemClick(AdapterView&lt;?&gt; parent, View view, int position,long id) { int curr1 = (int) sp1.getSelectedItemId(); int curr2 = (int) sp2.getSelectedItemId(); double result = Convert(curr1, curr2, amount.getText().toString()); etResult.setText(Double.toString(result)); } }; OnItemSelectedListener ItemSelectListener = new OnItemSelectedListener() { @Override public void onItemSelected(AdapterView&lt;?&gt; parent, View view,int position, long id) { try { int curr1 = (int) sp1.getSelectedItemId(); int curr2 = (int) sp2.getSelectedItemId(); double result = Convert(curr1, curr2, amount.getText().toString()); etResult.setText(Double.toString(result)); } catch(Exception e) { } } @Override public void onNothingSelected(AdapterView&lt;?&gt; arg0) { // TODO Auto-generated method stub } }; sp1.setOnItemSelectedListener(ItemSelectListener); sp2.setOnItemSelectedListener(ItemSelectListener); amount.addTextChangedListener(new TextWatcher() { @Override public void onTextChanged(CharSequence s, int start, int before, int count) { int length = s.length(); if(length == 0) //amount.setText("0.0"); s = "0.0"; int curr1 = (int) sp1.getSelectedItemId(); int curr2 = (int) sp2.getSelectedItemId(); //double result = Convert(curr1, curr2, amount.getText().toString()); double result = Convert(curr1, curr2, s.toString()); etResult.setText(Double.toString(result)); } @Override public void beforeTextChanged(CharSequence s, int start, int count,int after) { } @Override public void afterTextChanged(Editable s) { // TODO Auto-generated method stub } }); OnTouchListener l = new OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { // TODO Auto-generated method stub imm.hideSoftInputFromWindow(amount.getWindowToken(),0);// return true; } }; al.setOnTouchListener(l); sp1.setSelection(4); sp2.setSelection(0); } protected Double Convert(int currency_from_index, int currency_to_index, String s_amount) { // TODO Auto-generated method stub Double result = 0.0; Double amount = Double.parseDouble(s_amount); Double source = 0.0; Double destination = 0.0; if((dUS * dAUD * dINR * dGBP * dEURO * dTRY * dRUB * dJPY * dMYR) == 0) { result = 0.0; return result; } else { switch (currency_from_index) { case 0: source = dUS; break; case 1: source = dAUD; break; case 2: source = dINR; break; case 3: source = dGBP; break; case 4: source = dEURO; break; case 5: source = dILS; break; case 6: source = dTRY; break; case 7: source = dRUB; break; case 8: source = dJPY; break; case 9: source = dMYR; break; default: break; } switch (currency_to_index) { case 0: destination = dUS; break; case 1: destination = dAUD; break; case 2: destination = dINR; break; case 3: destination = dGBP; break; case 4: destination = dEURO; break; case 5: destination =dILS; break; case 6: destination =dTRY; break; case 7: destination =dRUB; break; case 8: destination =dJPY; break; case 9: destination =dMYR; break; default: break; } result = amount*destination/source; Math.round(result); try { df.setMaximumFractionDigits(decimalsize); df.setMinimumFractionDigits(decimalsize); String str_result = df.format(result); result = Double.parseDouble(str_result); } catch(Exception e) { } return result; } } public boolean getRate() { //ConversionRate cr = new ConversionRate(); try { //URL url = new URL(eText.getText().toString()); String path = "http://www.ecb.int/stats/eurofxref/eurofxref-daily.xml"; URL url = new URL(path); URLConnection conn = url.openConnection(); // Get the response BufferedReader rd = new BufferedReader(new InputStreamReader(conn.getInputStream())); XmlPullParserFactory factory = XmlPullParserFactory.newInstance(); factory.setNamespaceAware(true); XmlPullParser xpp = factory.newPullParser(); //xpp.setInput( new StringReader ( "&lt;foo&gt;Hello World!&lt;/foo&gt;" ) ); xpp.setInput(rd); int eventType = xpp.getEventType(); while (eventType != XmlPullParser.END_DOCUMENT) { if(eventType == XmlPullParser.START_DOCUMENT) { //System.out.println("Start document"); //tView.append("Start document"); } else if(eventType == XmlPullParser.END_DOCUMENT) { //System.out.println("End document"); //tView.append("End document"); } else if(eventType == XmlPullParser.START_TAG) { //System.out.println("Start tag "+xpp.getName()); //tView.append("Start tag "+xpp.getName()); //tView.append("Attribute Count = " + xpp.getAttributeCount()); if(xpp.getAttributeCount() &gt; 1) { /*tView.append("Currency = " + xpp.getAttributeValue(0) + "\t"); tView.append("Rate = " + xpp.getAttributeValue(1)); tView.append("\n");*/ //cr.setName(xpp.getAttributeValue(0)); //cr.setRate(Double.parseDouble(xpp.getAttributeValue(1))); if(xpp.getAttributeValue(0).equals(US))// toString()== US) Currency_convert.this.dUS = Double.parseDouble(xpp.getAttributeValue(1)); else if(xpp.getAttributeValue(0).equals(INR))// .toString() == "INR") dINR = Double.parseDouble(xpp.getAttributeValue(1)); else if(xpp.getAttributeValue(0).equals(GBP))// .toString() == "GBP") dGBP = Double.parseDouble(xpp.getAttributeValue(1)); else if(xpp.getAttributeValue(0).equals(AUD))// .toString() == "AUD") dAUD = Double.parseDouble(xpp.getAttributeValue(1)); else if(xpp.getAttributeValue(0).equals(ILS)) dILS = Double.parseDouble(xpp.getAttributeValue(1)); else if(xpp.getAttributeValue(0).equals(TRY)) dTRY = Double.parseDouble(xpp.getAttributeValue(1)); else if(xpp.getAttributeValue(0).equals(RUB)) dRUB = Double.parseDouble(xpp.getAttributeValue(1)); else if(xpp.getAttributeValue(0).equals(JPY)) dJPY = Double.parseDouble(xpp.getAttributeValue(1)); else if(xpp.getAttributeValue(0).equals(MYR)) dMYR = Double.parseDouble(xpp.getAttributeValue(1)); } } else if(eventType == XmlPullParser.END_TAG) { //System.out.println("End tag "+xpp.getName()); //tView.append("End tag "+xpp.getName()); } else if(eventType == XmlPullParser.TEXT) { //System.out.println("Text "+xpp.getText()); //tView.append("Text "+xpp.getText()); } eventType = xpp.next(); } return true; } catch(Exception e) { e.printStackTrace(); return false; } } } </code></pre> <p>and here is the logcat I am getting:</p> <pre><code>11-06 05:59:49.208: E/AndroidRuntime(5314): FATAL EXCEPTION: main 11-06 05:59:49.208: E/AndroidRuntime(5314): java.lang.NullPointerException 11-06 05:59:49.208: E/AndroidRuntime(5314): at com.example.dashboard_our.Currency_convert.Convert(Currency_convert.java:209) 11-06 05:59:49.208: E/AndroidRuntime(5314): at com.example.dashboard_our.Currency_convert$4.onTextChanged(Currency_convert.java:171) 11-06 05:59:49.208: E/AndroidRuntime(5314): at android.widget.TextView.sendOnTextChanged(TextView.java:7318) 11-06 05:59:49.208: E/AndroidRuntime(5314): at android.widget.TextView.handleTextChanged(TextView.java:7377) 11-06 05:59:49.208: E/AndroidRuntime(5314): at android.widget.TextView$ChangeWatcher.onTextChanged(TextView.java:9076) 11-06 05:59:49.208: E/AndroidRuntime(5314): at android.text.SpannableStringBuilder.sendTextChanged(SpannableStringBuilder.java:962) 11-06 05:59:49.208: E/AndroidRuntime(5314): at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:496) 11-06 05:59:49.208: E/AndroidRuntime(5314): at android.text.SpannableStringBuilder.delete(SpannableStringBuilder.java:212) 11-06 05:59:49.208: E/AndroidRuntime(5314): at android.text.SpannableStringBuilder.delete(SpannableStringBuilder.java:30) 11-06 05:59:49.208: E/AndroidRuntime(5314): at android.text.method.BaseKeyListener.backspaceOrForwardDelete(BaseKeyListener.java:94) 11-06 05:59:49.208: E/AndroidRuntime(5314): at android.text.method.BaseKeyListener.backspace(BaseKeyListener.java:49) 11-06 05:59:49.208: E/AndroidRuntime(5314): at android.text.method.BaseKeyListener.onKeyDown(BaseKeyListener.java:155) </code></pre> <p>and this the xml file:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;AbsoluteLayout android:id="@+id/AbsoluteLayout01" android:layout_width="fill_parent" android:layout_height="fill_parent" xmlns:android="http://schemas.android.com/apk/res/android"&gt; &lt;EditText android:id="@+id/txt1" android:text="@+id/EditText01" android:layout_height="wrap_content" android:layout_width="wrap_content" android:layout_y="10dip" android:numeric="decimal" android:singleLine="true" android:ems="8" android:hint="Enter amount" android:layout_x="5dip"&gt; &lt;/EditText&gt; &lt;EditText android:id="@+id/txt2" android:layout_height="wrap_content" android:layout_width="wrap_content" android:text="@+id/EditText02" android:editable="false" android:enabled="true" android:singleLine="true" android:layout_x="5dip" android:ems="8" android:layout_y="69dip"&gt; &lt;/EditText&gt; &lt;Button android:layout_height="wrap_content" android:layout_width="wrap_content" android:id="@+id/bb1" android:layout_x="50dip" android:text="Update Currency Rates" android:layout_y="120dip"&gt;&lt;/Button&gt; &lt;Spinner android:id="@+id/spinerr1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_x="182dp" android:layout_y="-14dp" /&gt; &lt;Spinner android:id="@+id/spinerr2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_x="176dp" android:layout_y="47dp" /&gt; &lt;/AbsoluteLayout&gt; </code></pre>
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    1. USruaa.brkat
    1. USruaa.brkat
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
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    2. PO
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    1. This table or related slice is empty.
    1. COWhat line is this Currency_convert.java:209 ?
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      1. POonTextChanged android NullPointerException
      1. USJoucks
    2. CO@Joucks Currency_convert is the name of my activity
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      1. USruaa.brkat
    3. COI know but what is the content of line 209 ? This is where the exception triggers.
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      1. USJoucks
 

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