I am programming a twitter app. I am making a search bar for usernames\/hashtags, and I am having some trouble adding views generated from XML to the currently existing LinearLayout.<\/p>\n
here is Search.java<\/p>\n
public class Search extends Activity{\n\nString searchType = \"username\";\n\npublic void onCreate(Bundle savedInstanceState) {\n super.onCreate(savedInstanceState);\n setContentView(R.layout.activity_search);\n\n EditText t = (EditText)findViewById(R.id.search_content);\n t.setOnClickListener(onClickSearch);\n t.setWidth(225);\n\n Button b = (Button)findViewById(R.id.search_button_search);\n b.setOnClickListener(onClickButton);\n}\n\n@Override\npublic boolean onCreateOptionsMenu(Menu menu) {\n getMenuInflater().inflate(R.menu.activity_search, menu);\n return true;\n}\n\nOnClickListener onClickSearch = new OnClickListener(){\n\n public void onClick(View v) {\n EditText searchContent = (EditText)findViewById(R.id.search_content);\n EditText clickedContent = (EditText)v;\n if((EditText)findViewById(R.id.search_content) == (EditText)v){\n EditText t = (EditText)v;\n t.setText(\"\");\n }\n\n \/\/EditText searchContent = (EditText)findViewById(R.id.search_content);\n \/\/EditText clickedContent = (EditText)v;\n\n \/*if((Button)v == (Button)findViewById(R.id.search_button_type)){\n EditText t = (EditText)findViewById(R.id.search_content);\n Search.this.searchByUserName(t.getText().toString());\n }\n\n if((Button)v == (Button)findViewById(R.id.search_button_search)){\n\n }*\/\n }\n\n};\n\nOnClickListener onClickButton = new OnClickListener(){\n\n public void onClick(View v) {\n \/\/if((Button)v == (Button)findViewById(R.id.search_button_search)){\n EditText t = (EditText)findViewById(R.id.search_content);\n Search s = new Search();\n s.searchByUserName(t.getText().toString());\n \/\/}\n\n \/\/if((Button)v == (Button)findViewById(R.id.search_button_search)){\n\n \/\/}\n }\n\n};\n\npublic void searchByUserName(String userName){\n \/\/System.out.println(\"beginning->searchByUserName\");\n TwitterHandler handler = new TwitterHandler();\n List views = handler.queryUserName(userName, this);\n\n LinearLayout ll = (LinearLayout)findViewById(R.id.search_panel);\n for(int i = 0; i < views.size(); i++){\n ll.addView(views.get(i));\n }\n}\n<\/code><\/pre>\n}<\/p>\n
here is the XML<\/p>\n
\n \n\n \n \n\n \n\n<\/code><\/pre>\nMy LogCat is telling me there is a NullPointerException, the process is forced to quit on the android virtual device. Please Help!!!<\/p>\n
Here is the TwitterHandler<\/p>\n
public class TwitterHandler extends DefaultHandler{\nprivate final String USER_SEARCH = \"https:\/\/api.twitter.com\/1\/users\/lookup.xml?screen_name=\";\n\npublic List queryUserName(String userName, Context context){\n System.out.println(\"beginning->queryUserName\");\n String url = USER_SEARCH + userName;\n \/\/ListView view = new ListView(context);\n List views = new ArrayList();\n Document doc = null;\n DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();\n try {\n System.out.println(\"in try statement->queryUserName\");\n DocumentBuilder db = dbf.newDocumentBuilder();\n\n InputSource is = new InputSource();\n is.setCharacterStream(new StringReader(url));\n doc = db.parse(is); \n\n NodeList nl = doc.getChildNodes();\n\n for(int i = 0; i < nl.getLength(); i++){\n Element e = (Element)nl.item(i);\n TextView t = new TextView(context);\n\n String name = \"\";\n String screenName = \"\";\n Bitmap bitmap = null;\n\n Node n = (Node)e.getChild(\"name\");\n name = n.getTextContent();\n t.setText(name);\n views.add(t);\n\n t = new TextView(context);\n n = (Node)e.getChild(\"screen_name\");\n screenName = n.getTextContent();\n t.setText(screenName);\n views.add(t);\n\n n = (Node)e.getChild(\"profile_image_url\");\n bitmap = getBitmap(n.getTextContent());\n ImageView imageView = new ImageView(context);\n imageView.setImageBitmap(bitmap);\n views.add(imageView);\n\n }\n\n }catch(Exception e){ }\n return views;\n}\n\nprivate Bitmap getBitmap(String imageUrl) throws IOException{\nInputStream inputStream = null;\n URL u = new URL(imageUrl);\n URLConnection conn = u.openConnection();\n\n try{\n HttpURLConnection httpConn = (HttpURLConnection)conn;\n httpConn.setRequestMethod(\"GET\");\n httpConn.connect();\n\n if (httpConn.getResponseCode() == HttpURLConnection.HTTP_OK) {\n inputStream = httpConn.getInputStream();\n }\n }\n catch (Exception ex) { }\n\nreturn BitmapFactory.decodeStream(inputStream);\n\n}\n\n}\n<\/code><\/pre>\nHere is the Log<\/p>\n
07-26 17:00:24.523: D\/AndroidRuntime(335): Shutting down VM\n07-26 17:00:24.523: W\/dalvikvm(335): threadid=1: thread exiting with uncaught exception (group=0x40015560)\n07-26 17:00:24.533: E\/AndroidRuntime(335): FATAL EXCEPTION: main\n07-26 17:00:24.533: E\/AndroidRuntime(335): java.lang.ClassCastException: java.util.AbstractList$SubAbstractListRandomAccess\n07-26 17:00:24.533: E\/AndroidRuntime(335): at com.example.twitter.viewer.Search.searchByUserName(Search.java:84)\n07-26 17:00:24.533: E\/AndroidRuntime(335): at com.example.twitter.viewer.Search$2.onClick(Search.java:71)\n07-26 17:00:24.533: E\/AndroidRuntime(335): at android.view.View.performClick(View.java:2485)\n07-26 17:00:24.533: E\/AndroidRuntime(335): at android.view.View$PerformClick.run(View.java:9080)\n07-26 17:00:24.533: E\/AndroidRuntime(335): at android.os.Handler.handleCallback(Handler.java:587)\n07-26 17:00:24.533: E\/AndroidRuntime(335): at android.os.Handler.dispatchMessage(Handler.java:92)\n07-26 17:00:24.533: E\/AndroidRuntime(335): at android.os.Looper.loop(Looper.java:123)\n07-26 17:00:24.533: E\/AndroidRuntime(335): at android.app.ActivityThread.main(ActivityThread.java:3683)\n07-26 17:00:24.533: E\/AndroidRuntime(335): at java.lang.reflect.Method.invokeNative(Native Method)\n07-26 17:00:24.533: E\/AndroidRuntime(335): at java.lang.reflect.Method.invoke(Method.java:507)\n07-26 17:00:24.533: E\/AndroidRuntime(335): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)\n07-26 17:00:24.533: E\/AndroidRuntime(335): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)\n07-26 17:00:24.533: E\/AndroidRuntime(335): at dalvik.system.NativeStart.main(Native Method)\n<\/code><\/pre>\n\n- \n
You are trying to make a new Instance Object<\/strong> of your Search Activity<\/code>. In which your contentView<\/code> is not available, so you can not define LinearLayout<\/code> at searchByUserName<\/code> method.<\/p>\nInstead just simple use method name..<\/p>\n
So Replace these lines,<\/p>\n
Search s = new Search();\ns.searchByUserName(t.getText().toString());\n<\/code><\/pre>\nwith only,<\/p>\n
searchByUserName(t.getText().toString());\n<\/code><\/pre>\n<\/li>\n<\/ol>\nOriginally posted 2013-11-16 20:49:07. <\/small><\/p>","protected":false},"excerpt":{"rendered":"
I am programming a twitter app. I am making a search bar for usernames\/hashtags, and I am having some trouble adding views generated from XML to the currently existing LinearLayout. here is Search.java public class Search extends Activity{ String searchType = “username”; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_search); EditText t = (EditText)findViewById(R.id.search_content); t.setOnClickListener(onClickSearch); t.setWidth(225); […]<\/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-1415","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/posts\/1415","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=1415"}],"version-history":[{"count":0,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/posts\/1415\/revisions"}],"wp:attachment":[{"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/media?parent=1415"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/categories?post=1415"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/tags?post=1415"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}