i have some problem, i want to make my application OAuth with twitter account<\/p>\n
This is my Main.xml file<\/p>\n
\n\n \n\n \n\n\n<\/code><\/pre>\nAnd this is my Main.java File<\/p>\n
package com.test.twitteroauth;\n\nimport oauth.signpost.OAuth;\nimport oauth.signpost.commonshttp.CommonsHttpOAuthConsumer;\nimport oauth.signpost.commonshttp.CommonsHttpOAuthProvider;\nimport oauth.signpost.exception.OAuthCommunicationException;\nimport oauth.signpost.exception.OAuthExpectationFailedException;\nimport oauth.signpost.exception.OAuthMessageSignerException;\nimport oauth.signpost.exception.OAuthNotAuthorizedException;\nimport android.net.Uri;\nimport android.os.Bundle;\nimport android.app.Activity;\nimport android.app.Dialog;\nimport android.content.Intent;\nimport android.util.Log;\nimport android.view.Menu;\nimport android.view.View;\nimport android.view.View.OnClickListener;\nimport android.widget.ImageButton;\n\n\n\npublic class MainActivity extends Activity {\n\n private static final String CONSUMER_KEY = \"CONSUMER KEY GOES HERE\";\n private static final String CONSUMER_SECRET = \"CONSUMER SECRET GOES HERE\";\n\n private static String ACCESS_KEY = null;\n private static String ACCESS_SECRET = null;\n\n\n private static final String REQUEST_URL = \"http:\/\/twitter.com\/oauth\/request_token\";\n private static final String ACCESS_TOKEN_URL = \"http:\/\/twitter.com\/oauth\/access_token\";\n private static final String AUTH_URL = \"http:\/\/twitter.com\/oauth\/authorize\";\n private static final String CALLBACK_URL = \"OauthTwitter:\/\/twitt\";\n private static final String PREFERENCE_FILE = \"twitter_oauth.prefs\";\n\n private static CommonsHttpOAuthConsumer consumer = new CommonsHttpOAuthConsumer(CONSUMER_KEY, CONSUMER_SECRET);\n private static CommonsHttpOAuthProvider provider = new CommonsHttpOAuthProvider(REQUEST_URL, ACCESS_TOKEN_URL, AUTH_URL);\n\n\n @Override\n public void onCreate(Bundle savedInstanceState) {\n\n ImageButton btnTwitterConnect = (ImageButton) findViewById(R.id.btnTwitterConnect);\n btnTwitterConnect.setOnClickListener(new OnClickListener() {\n\n public void onClick(View v) {\n \/\/ TODO Auto-generated method stub\n\n try {\n String authURL = provider.retrieveRequestToken(consumer, CALLBACK_URL);\n Log.d(\"OAuthTwitter\", authURL);\n startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse(authURL)));\n } catch (OAuthMessageSignerException e) {\n e.printStackTrace();\n } catch (OAuthNotAuthorizedException e) {\n e.printStackTrace();\n } catch (OAuthExpectationFailedException e) {\n e.printStackTrace();\n } catch (OAuthCommunicationException e) {\n e.printStackTrace();\n }\n }\n }); \n }\n\n @Override\n public void onResume() {\n super.onResume();\n Uri uri = this.getIntent().getData();\n\n if (uri != null && uri.toString().startsWith(CALLBACK_URL)) {\n Log.d(\"OAuthTwitter\", uri.toString());\n String verifier = uri.getQueryParameter(OAuth.OAUTH_VERIFIER);\n Log.d(\"OAuthTwitter\", verifier);\n try {\n provider.retrieveAccessToken(consumer, verifier);\n ACCESS_KEY = consumer.getToken();\n ACCESS_SECRET = consumer.getTokenSecret();\n\n Log.d(\"OAuthTwitter\", ACCESS_KEY);\n Log.d(\"OAuthTwitter\", ACCESS_SECRET);\n\n } catch (OAuthMessageSignerException e) {\n e.printStackTrace();\n } catch (OAuthNotAuthorizedException e) {\n e.printStackTrace();\n } catch (OAuthExpectationFailedException e) {\n e.printStackTrace();\n } catch (OAuthCommunicationException e) {\n e.printStackTrace();\n }\n }\n }\n\n @Override\n public boolean onCreateOptionsMenu(Menu menu) {\n getMenuInflater().inflate(R.menu.main, menu);\n return true;\n }\n\n\n}\n<\/code><\/pre>\nI just followed the tutorial here: http:\/\/blog.copyninja.info\/2010\/09\/android-oauth-authentication-with.html<\/p>\n
But the android application is always Crashed<\/p>\n
LogCat Details:<\/p>\n
09-08 19:11:13.754: D\/AndroidRuntime(566): Shutting down VM\n09-08 19:11:13.754: W\/dalvikvm(566): threadid=1: thread exiting with uncaught exception (group=0x4001d800)\n09-08 19:11:13.785: E\/AndroidRuntime(566): FATAL EXCEPTION: main\n09-08 19:11:13.785: E\/AndroidRuntime(566): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.test.twitteroauth\/com.test.twitteroauth.MainActivity}: java.lang.NullPointerException\n09-08 19:11:13.785: E\/AndroidRuntime(566): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)\n09-08 19:11:13.785: E\/AndroidRuntime(566): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)\n09-08 19:11:13.785: E\/AndroidRuntime(566): at android.app.ActivityThread.access$2300(ActivityThread.java:125)\n09-08 19:11:13.785: E\/AndroidRuntime(566): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)\n09-08 19:11:13.785: E\/AndroidRuntime(566): at android.os.Handler.dispatchMessage(Handler.java:99)\n09-08 19:11:13.785: E\/AndroidRuntime(566): at android.os.Looper.loop(Looper.java:123)\n09-08 19:11:13.785: E\/AndroidRuntime(566): at android.app.ActivityThread.main(ActivityThread.java:4627)\n09-08 19:11:13.785: E\/AndroidRuntime(566): at java.lang.reflect.Method.invokeNative(Native Method)\n09-08 19:11:13.785: E\/AndroidRuntime(566): at java.lang.reflect.Method.invoke(Method.java:521)\n09-08 19:11:13.785: E\/AndroidRuntime(566): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)\n09-08 19:11:13.785: E\/AndroidRuntime(566): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)\n09-08 19:11:13.785: E\/AndroidRuntime(566): at dalvik.system.NativeStart.main(Native Method)\n09-08 19:11:13.785: E\/AndroidRuntime(566): Caused by: java.lang.NullPointerException\n09-08 19:11:13.785: E\/AndroidRuntime(566): at com.test.twitteroauth.MainActivity.onCreate(MainActivity.java:44)\n09-08 19:11:13.785: E\/AndroidRuntime(566): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)\n09-08 19:11:13.785: E\/AndroidRuntime(566): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)\n09-08 19:11:13.785: E\/AndroidRuntime(566): ... 11 more\n<\/code><\/pre>\nI know it’s caused by java.Lang.NullPointerException but where is the errors?<\/p>\n
Thank you<\/p>\n
(Android 2.2, Eclipse 3.7, Java JDK 1.7)<\/p>\n
\n- \n
In addition to the setContentView(...)<\/code>, you should call super.onCreate(savedInstanceState);<\/code> above it, otherwise you’ll end up with a SuperNotCalledException<\/code><\/p>\n@Override\npublic void onCreate(Bundle savedInstanceState) {\n super.onCreate(savedInstanceState);\n setContentView(...);\n\n \/\/ ...\n\n}\n<\/code><\/pre>\n<\/li>\n- \n
Please Add setcontentview(R.layout.main)<\/code> line before ImageButton btnTwitterConnect = (ImageButton) findViewById(R.id.btnTwitterConnect);<\/code>, it will solve your problem.<\/p>\n<\/li>\n- \n
You need to call setContentView(layoutID)<\/code> and pass in the layout the button belongs too before you call findViewById(viewId)<\/code><\/p>\n<\/li>\n<\/ol>\nOriginally posted 2013-11-16 20:52:48. <\/small><\/p>","protected":false},"excerpt":{"rendered":"
i have some problem, i want to make my application OAuth with twitter account This is my Main.xml file And this is my Main.java File package com.test.twitteroauth; import oauth.signpost.OAuth; import oauth.signpost.commonshttp.CommonsHttpOAuthConsumer; import oauth.signpost.commonshttp.CommonsHttpOAuthProvider; import oauth.signpost.exception.OAuthCommunicationException; import oauth.signpost.exception.OAuthExpectationFailedException; import oauth.signpost.exception.OAuthMessageSignerException; import oauth.signpost.exception.OAuthNotAuthorizedException; import android.net.Uri; import android.os.Bundle; import android.app.Activity; import android.app.Dialog; import android.content.Intent; import android.util.Log; import android.view.Menu; […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1436","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/posts\/1436","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/comments?post=1436"}],"version-history":[{"count":0,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/posts\/1436\/revisions"}],"wp:attachment":[{"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/media?parent=1436"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/categories?post=1436"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/tags?post=1436"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}