我遇到以下错误:方法getApplicationContext()未定义对于类型Fragment1],未定义方法findViewById(int)
这些错误似乎在我的班级扩展到一个活动而不是一个片段时被消除了,但是将这个活动保留为一个片段很重要,所以我不太确定如何解决这个问题。
任何帮助将不胜感激。预先感谢。
下面是代码
public class Fragment1 extends Fragment { private String currentUserId; private ArrayAdapter<String> namesArrayAdapter; private ArrayList<String> names; private ListView usersListView; private Button logoutButton; String userGender = ParseUser.getCurrentUser().getString("Gender"); String activityName = ParseUser.getCurrentUser().getString("ActivityName"); Number maxDistance = ParseUser.getCurrentUser().getNumber("Maximum_Distance"); String userLookingGender = ParseUser.getCurrentUser().getString("Looking_Gender"); Number minimumAge = ParseUser.getCurrentUser().getNumber("Minimum_Age"); Number maximumAge = ParseUser.getCurrentUser().getNumber("Maximum_Age"); Number userage = ParseUser.getCurrentUser().getNumber("Age"); @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // TODO Auto-generated method stub if (container == null){ return null; } return (LinearLayout)inflater.inflate(R.layout.fragment1_layout, container,false); logoutButton = (Button) findViewById(R.id.logoutButton); logoutButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { ParseUser.logOut(); Intent intent = new Intent(getApplicationContext(), LoginActivity.class); startActivity(intent); } }); setConversationsList(); } private void setConversationsList() { currentUserId = ParseUser.getCurrentUser().getObjectId(); names = new ArrayList<String>(); // String userActivitySelectionName = null; ParseQuery<ParseUser> query = ParseUser.getQuery(); // query.whereEqualTo("ActivityName",userActivitySelectionName); query.whereNotEqualTo("objectId", ParseUser.getCurrentUser().getObjectId()); // users with Gender = currentUser.Looking_Gender query.whereEqualTo("Gender", userLookingGender); // users with Looking_Gender = currentUser.Gender query.whereEqualTo("Looking_Gender", userGender); query.setLimit(1); query.whereEqualTo("ActivityName", activityName); query.whereGreaterThanOrEqualTo("Minimum_Age", minimumAge).whereGreaterThanOrEqualTo("Age", userage); query.whereLessThanOrEqualTo("Maximum_Age", maximumAge).whereLessThanOrEqualTo("Age", userage); // query.whereWithinKilometers("Maximum_Distance", point, maxDistance) query.findInBackground(new FindCallback<ParseUser>() { public void done(List<ParseUser> userList, ParseException e) { if (e == null) { for (int i=0; i<userList.size(); i++) { names.add(userList.get(i).get("Name").toString()); names.add(userList.get(i).get("Headline").toString()); names.add(userList.get(i).get("Age").toString()); // names.add(userList.get(i).getParseObject("ProfilePicture").; } usersListView = (ListView)findViewById(R.id.usersListView); namesArrayAdapter = new ArrayAdapter<String>(getApplicationContext(), R.layout.user_list_item, names); usersListView.setAdapter(namesArrayAdapter); usersListView.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> a, View v, int i, long l) { openConversation(names, i); } }); } else { Toast.makeText(getApplicationContext(), "Error loading user list", Toast.LENGTH_LONG).show(); } } }); } public void openConversation(ArrayList<String> names, int pos) { ParseQuery<ParseUser> query = ParseUser.getQuery(); query.whereEqualTo("Name", names.get(pos)); query.findInBackground(new FindCallback<ParseUser>() { public void done(List<ParseUser> user, ParseException e) { if (e == null) { Intent intent = new Intent(getApplicationContext(), MessagingActivity.class); intent.putExtra("RECIPIENT_ID", user.get(0).getObjectId()); startActivity(intent); } else { Toast.makeText(getApplicationContext(), "Error finding that user", Toast.LENGTH_SHORT).show(); } } }); } }
更新setConversationList的代码无法到达错误
@Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // TODO Auto-generated method stub if (container == null){ return null; } return (LinearLayout)inflater.inflate(R.layout.fragment1_layout, container,false); setConversationsList(); } private void setConversationsList() { currentUserId = ParseUser.getCurrentUser().getObjectId(); names = new ArrayList<String>(); // String userActivitySelectionName = null; ParseQuery<ParseUser> query = ParseUser.getQuery();
更新
启动活动后,我收到以下消息:
08-15 14:52:16.365: E/AndroidRuntime(3332): FATAL EXCEPTION: main 08-15 14:52:16.365: E/AndroidRuntime(3332): Process: com.dooba.beta, PID: 3332 08-15 14:52:16.365: E/AndroidRuntime(3332): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.dooba.beta/com.dooba.beta.usermatch}: java.lang.NullPointerException 08-15 14:52:16.365: E/AndroidRuntime(3332): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195) 08-15 14:52:16.365: E/AndroidRuntime(3332): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245) 08-15 14:52:16.365: E/AndroidRuntime(3332): at android.app.ActivityThread.access$800(ActivityThread.java:135) 08-15 14:52:16.365: E/AndroidRuntime(3332): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196) 08-15 14:52:16.365: E/AndroidRuntime(3332): at android.os.Handler.dispatchMessage(Handler.java:102) 08-15 14:52:16.365: E/AndroidRuntime(3332): at android.os.Looper.loop(Looper.java:136) 08-15 14:52:16.365: E/AndroidRuntime(3332): at android.app.ActivityThread.main(ActivityThread.java:5017) 08-15 14:52:16.365: E/AndroidRuntime(3332): at java.lang.reflect.Method.invokeNative(Native Method) 08-15 14:52:16.365: E/AndroidRuntime(3332): at java.lang.reflect.Method.invoke(Method.java:515) 08-15 14:52:16.365: E/AndroidRuntime(3332): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779) 08-15 14:52:16.365: E/AndroidRuntime(3332): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595) 08-15 14:52:16.365: E/AndroidRuntime(3332): at dalvik.system.NativeStart.main(Native Method) 08-15 14:52:16.365: E/AndroidRuntime(3332): Caused by: java.lang.NullPointerException 08-15 14:52:16.365: E/AndroidRuntime(3332): at com.dooba.beta.usermatch.initialisePaging(usermatch.java:32) 08-15 14:52:16.365: E/AndroidRuntime(3332): at com.dooba.beta.usermatch.onCreate(usermatch.java:20) 08-15 14:52:16.365: E/AndroidRuntime(3332): at android.app.Activity.performCreate(Activity.java:5231) 08-15 14:52:16.365: E/AndroidRuntime(3332): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087) 08-15 14:52:16.365: E/AndroidRuntime(3332): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159) 08-15 14:52:16.365: E/AndroidRuntime(3332): ... 11 more
下面是需要该片段的活动页面
以下是我在logcat中收到的消息import java.util.List; import java.util.Vector; import android.app.Activity; import android.os.Bundle; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentActivity; import android.support.v4.view.ViewPager; import android.view.Menu; import android.view.MenuItem; public class usermatch extends FragmentActivity { private PageAdapter mPagerAdapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.viewpager_layout); initialisePaging(); } private void initialisePaging() { // TODO Auto-generated method stub List<Fragment> fragments = new Vector<Fragment>(); fragments.add(Fragment.instantiate(this, Fragment1.class.getName())); fragments.add(Fragment.instantiate(this, Fragment2.class.getName())); fragments.add(Fragment.instantiate(this, Fragment3.class.getName())); mPagerAdapter = new PageAdapter(this.getSupportFragmentManager(), fragments); ViewPager pager = (ViewPager) findViewById(R.id.viewpager); pager.setAdapter(mPagerAdapter); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.mood, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); } }
更新2
08-15 17:42:28.863: E/AndroidRuntime(4974): FATAL EXCEPTION: main
08-15 17:42:28.863: E/AndroidRuntime(4974): Process: com.dooba.beta, PID: 4974
08-15 17:42:28.863: E/AndroidRuntime(4974): java.lang.NullPointerException
08-15 17:42:28.863: E/AndroidRuntime(4974): at com.dooba.beta.Fragment1$1.done(Fragment1.java:108)
08-15 17:42:28.863: E/AndroidRuntime(4974): at com.parse.FindCallback.internalDone(FindCallback.java:45)
08-15 17:42:28.863: E/AndroidRuntime(4974): at com.parse.FindCallback.internalDone(FindCallback.java:1)
08-15 17:42:28.863: E/AndroidRuntime(4974): at com.parse.Parse$6$1.run(Parse.java:888)
08-15 17:42:28.863: E/AndroidRuntime(4974): at android.os.Handler.handleCallback(Handler.java:733)
08-15 17:42:28.863: E/AndroidRuntime(4974): at android.os.Handler.dispatchMessage(Handler.java:95)
08-15 17:42:28.863: E/AndroidRuntime(4974): at android.os.Looper.loop(Looper.java:136)
08-15 17:42:28.863: E/AndroidRuntime(4974): at android.app.ActivityThread.main(ActivityThread.java:5017)
08-15 17:42:28.863: E/AndroidRuntime(4974): at java.lang.reflect.Method.invokeNative(Native Method)
08-15 17:42:28.863: E/AndroidRuntime(4974): at java.lang.reflect.Method.invoke(Method.java:515)
08-15 17:42:28.863: E/AndroidRuntime(4974): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
08-15 17:42:28.863: E/AndroidRuntime(4974): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
08-15 17:42:28.863: E/AndroidRuntime(4974): at dalvik.system.NativeStart.main(Native Method)
我遇到以下错误:未定义类型Fragment1的方法getApplicationContext()未找到方法findViewById(int)当我的班级时,似乎消除了这些错误...