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POGet IP Address in Android
 

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    <p>I'm implementing application for getting the IP Address of my device/mobile in my android app from PHP. I'm using httpGet() method for getting the Ip Address. I got NullPointerException in my logcat. </p> <p>Here is my code.</p> <pre><code>public class Code_Demo extends Activity { Button btnSubmitCode; EditText editText_Code; TextView textView_ReadCode; String pref_filename="code_file"; String strReadFile; HttpClient httpclient; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.code); editText_Code=(EditText)findViewById(R.id.edText_Code); textView_ReadCode=(TextView)findViewById(R.id.textView_ReadCode); btnSubmitCode=(Button)findViewById(R.id.button_Submit); btnSubmitCode.setOnClickListener(new OnClickListener() { @Override public void onClick(View arg0) { // TODO Auto-generated method stub String strCode = editText_Code.getText().toString().trim(); create_File(strCode); if(editText_Code.getText().toString().isEmpty()) { Toast.makeText(getApplicationContext(),"Please Enter Code", Toast.LENGTH_SHORT).show(); } SharedPreferences sharedPref1 =getSharedPreferences(pref_filename, 0); SharedPreferences.Editor editor = sharedPref1.edit(); editor.putString("code",strCode); Log.e("Editor Num 1:", strCode); editor.commit(); //readFile(); try { getIp_Address(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } Intent intent_CodeDemo = new Intent(Code_Demo.this , Gsk_Demo.class); startActivity(intent_CodeDemo); } }); } // onCreate() method end here //Get Ip Address public void getIp_Address() throws IOException { HttpGet httppost1 = new HttpGet("http://api.externalip.net/ip"); HttpResponse response = null; try { response = httpclient.execute(httppost1); } catch (ClientProtocolException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } HttpEntity ht = response.getEntity(); BufferedHttpEntity buf = new BufferedHttpEntity(ht); InputStream is = buf.getContent(); BufferedReader r = new BufferedReader(new InputStreamReader(is)); StringBuilder total = new StringBuilder(); String ipaddress = r.readLine(); Log.e("ipaddress",ipaddress); } } </code></pre> <p>Here Is My LogCat which i got nullPointerException</p> <pre><code>11-13 15:51:04.245: W/KeyCharacterMap(1077): No keyboard for id 0 11-13 15:51:04.245: W/KeyCharacterMap(1077): Using default keymap: /system/usr/keychars/qwerty.kcm.bin 11-13 15:51:05.631: E/Editor Num 1:(1077): gskhmjd 11-13 15:51:05.662: D/AndroidRuntime(1077): Shutting down VM 11-13 15:51:05.662: W/dalvikvm(1077): threadid=1: thread exiting with uncaught exception (group=0x40015560) 11-13 15:51:05.671: E/AndroidRuntime(1077): FATAL EXCEPTION: main 11-13 15:51:05.671: E/AndroidRuntime(1077): java.lang.NullPointerException 11-13 15:51:05.671: E/AndroidRuntime(1077): at com.gsk.Code_Demo.getIp_Address(Code_Demo.java:94) 11-13 15:51:05.671: E/AndroidRuntime(1077): at com.gsk.Code_Demo$1.onClick(Code_Demo.java:71) 11-13 15:51:05.671: E/AndroidRuntime(1077): at android.view.View.performClick(View.java:2485) 11-13 15:51:05.671: E/AndroidRuntime(1077): at android.view.View$PerformClick.run(View.java:9080) 11-13 15:51:05.671: E/AndroidRuntime(1077): at android.os.Handler.handleCallback(Handler.java:587) 11-13 15:51:05.671: E/AndroidRuntime(1077): at android.os.Handler.dispatchMessage(Handler.java:92) 11-13 15:51:05.671: E/AndroidRuntime(1077): at android.os.Looper.loop(Looper.java:123) 11-13 15:51:05.671: E/AndroidRuntime(1077): at android.app.ActivityThread.main(ActivityThread.java:3683) 11-13 15:51:05.671: E/AndroidRuntime(1077): at java.lang.reflect.Method.invokeNative(Native Method) 11-13 15:51:05.671: E/AndroidRuntime(1077): at java.lang.reflect.Method.invoke(Method.java:507) 11-13 15:51:05.671: E/AndroidRuntime(1077): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 11-13 15:51:05.671: E/AndroidRuntime(1077): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 11-13 15:51:05.671: E/AndroidRuntime(1077): at dalvik.system.NativeStart.main(Native Method) </code></pre>
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    1. UStazeenmulani
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    1. COPlease avoid HTTP-Tasks in the UI-Thread! Use a AsyncTask instead. I think you get a NetworkOnMainThread Exception before so your response is null
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    2. COAnd please post your LogCat and highlight the Line where your NullPointer is thrown.
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    3. COhttp://stackoverflow.com/questions/6064510/how-to-get-ip-address-of-the-device
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      1. USdiordna
 

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