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06-28 21:08:36.339: E/AndroidRuntime(2401): FATAL EXCEPTION: main
06-28 21:08:36.339: E/AndroidRuntime(2401): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.hypermart.namespace/com.hypermart.namespace.RegisterActivity}: java.lang.NullPointerException
06-28 21:08:36.339: E/AndroidRuntime(2401): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
06-28 21:08:36.339: E/AndroidRuntime(2401): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
06-28 21:08:36.339: E/AndroidRuntime(2401): at android.app.ActivityThread.access$600(ActivityThread.java:123)
06-28 21:08:36.339: E/AndroidRuntime(2401): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
06-28 21:08:36.339: E/AndroidRuntime(2401): at android.os.Handler.dispatchMessage(Handler.java:99)
06-28 21:08:36.339: E/AndroidRuntime(2401): at android.os.Looper.loop(Looper.java:137)
06-28 21:08:36.339: E/AndroidRuntime(2401): at android.app.ActivityThread.main(ActivityThread.java:4424)
06-28 21:08:36.339: E/AndroidRuntime(2401): at java.lang.reflect.Method.invokeNative(Native Method)
06-28 21:08:36.339: E/AndroidRuntime(2401): at java.lang.reflect.Method.invoke(Method.java:511)
06-28 21:08:36.339: E/AndroidRuntime(2401): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
06-28 21:08:36.339: E/AndroidRuntime(2401): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
06-28 21:08:36.339: E/AndroidRuntime(2401): at dalvik.system.NativeStart.main(Native Method)
06-28 21:08:36.339: E/AndroidRuntime(2401): Caused by: java.lang.NullPointerException
06-28 21:08:36.339: E/AndroidRuntime(2401): at com.hypermart.namespace.RegisterActivity.onCreate(RegisterActivity.java:28)
06-28 21:08:36.339: E/AndroidRuntime(2401): at android.app.Activity.performCreate(Activity.java:4465)
06-28 21:08:36.339: E/AndroidRuntime(2401): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
06-28 21:08:36.339: E/AndroidRuntime(2401): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
06-28 21:08:36.339: E/AndroidRuntime(2401): ... 11 more
basically the application stops in the emulator when the button is click...
here is the code
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.login_form);
btnLinkToRegister=(Button)findViewById(R.id.btnRegister);
b = (Button)findViewById(R.id.btnLogin);
et = (EditText)findViewById(R.id.loginUsername);
pass= (EditText)findViewById(R.id.loginPassword);
tv = (TextView)findViewById(R.id.login_error);
b.setonclickListener(new onclickListener() {
public void onclick(View v) {
dialog = ProgressDialog.show(MobileHyperMartActivity.this, "",
"Validating user...", true);
new Thread(new Runnable() {
public void run() {
try{
httpclient=new DefaultHttpClient();
httppost= new HttpPost("http://10.0.2.2/Webservice/Connections.php"); // make sure the url is correct.
//add your data
nameValuePairs = new ArrayList<NameValuePair>(2);
// Always use the same variable name for posting i.e the android side variable name and php side variable name should be similar,
nameValuePairs.add(new BasicNameValuePair("username",et.getText().toString().trim())); // $Edittext_value = $_POST['Edittext_value'];
nameValuePairs.add(new BasicNameValuePair("password",pass.getText().toString().trim()));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
//Execute HTTP Post Request
response=httpclient.execute(httppost);
ResponseHandler<String> responseHandler = new BasicResponseHandler();
final String response = httpclient.execute(httppost, responseHandler);
System.out.println("Response : " + response);
runOnUiThread(new Runnable() {
public void run() {
tv.setText("Response from PHP : " + response);
dialog.dismiss();
}
});
if(response.equalsIgnoreCase("User Found")){
runOnUiThread(new Runnable() {
public void run() {
Toast.makeText(MobileHyperMartActivity.this,"Login Success", Toast.LENGTH_SHORT).show();
}
});
startActivity(new Intent(MobileHyperMartActivity.this, dashboard.class));
}else{
showAlert();
}
}catch(Exception e){
dialog.dismiss();
System.out.println("Exception : " + e.getMessage());
}
}
}).start();
}
});
// Link to Register Screen
btnLinkToRegister.setonclickListener(new View.onclickListener() {
public void onclick(View v) {
Intent i = new Intent(MobileHyperMartActivity.this,
RegisterActivity.class);
startActivity(i);
startActivityForResult(i, 0);
finish();
}
});
}
public void showAlert(){
MobileHyperMartActivity.this.runOnUiThread(new Runnable() {
public void run() {
AlertDialog.Builder builder = new AlertDialog.Builder(MobileHyperMartActivity.this);
builder.setTitle("Login Error.");
builder.setMessage("User not Found.")
.setCancelable(false)
.setPositiveButton("OK", new DialogInterface.onclickListener() {
public void onclick(DialogInterface dialog, int id) {
}
});
AlertDialog alert = builder.create();
alert.show();
}
});
}
even if there is no code in the register onclick the application stops..
This post has been edited by polens: 28 June 2012 - 06:18 AM
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