我正在使用 phonegap facebook https://github.com/phonegap/phonegap-facebook-plugin插件来构建一个 facebook 应用程序。并按照https://developers.facebook.com/docs/android/getting-started/facebook-sdk-for-android/的说明进行操作。我完成了所有步骤，直到第 2 步 - 个性化，并且一切正常，但现在我的代码中出现了奇怪的错误，并且厌倦了删除这些错误。由于我是新手，所以我不明白如何解决这些错误。我们将非常感谢您的帮助和指导。谢谢这是我的主要活动：package com.tcs.facebook;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.view.Menu;
import android.view.MenuItem;
import com.facebook.Session;
import com.facebook.SessionState;
import com.facebook.UiLifecycleHelper;
public class MainActivity extends FragmentActivity {
private static final int SPLASH = 0;
private static final int SELECTION = 1;
// private static final int FRAGMENT_COUNT = SELECTION +1;
private static final int SETTINGS = 2;
private static final int FRAGMENT_COUNT = SETTINGS + 1;
private MenuItem settings;
private Fragment[] fragments = new Fragment[FRAGMENT_COUNT];
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
// only add the menu when the selection fragment is showing
if (fragments[SELECTION].isVisible()) {
if (menu.size() == 0) {
settings = menu.add(R.string.settings); /* Error : settings cannot be resolved or is not a field*/
}
return true;
} else {
menu.clear();
settings = null;
}
return false;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
uiHelper = new UiLifecycleHelper(this, callback);
uiHelper.onCreate(savedInstanceState);
setContentView(R.layout.main); /*Error : layout cannot be resolved or is not a field*/
FragmentManager fm = getSupportFragmentManager();
fragments[SPLASH] = fm.findFragmentById(R.id.splashFragment); /*Error : id cannot be resolved or is not a field*/
fragments[SELECTION] = fm.findFragmentById(R.id.selectionFragment); /*Error : id cannot be resolved or is not a field*/
fragments[SELECTION] = fm.findFragmentById(R.id.selectionFragment); /*Error : id cannot be resolved or is not a field*/
fragments[SETTINGS] = fm.findFragmentById(R.id.userSettingsFragment); /*Error : id cannot be resolved or is not a field*/
FragmentTransaction transaction = fm.beginTransaction();
for (int i = 0; i < fragments.length; i++) {
transaction.hide(fragments[i]);
}
transaction.commit();
}
private void showFragment(int fragmentIndex, boolean addToBackStack) {
FragmentManager fm = getSupportFragmentManager();
FragmentTransaction transaction = fm.beginTransaction();
for (int i = 0; i < fragments.length; i++) {
if (i == fragmentIndex) {
transaction.show(fragments[i]);
} else {
transaction.hide(fragments[i]);
}
}
if (addToBackStack) {
transaction.addToBackStack(null);
}
transaction.commit();
}
private boolean isResumed = false;
@Override
public void onResume() {
super.onResume();
uiHelper.onResume();
isResumed = true;
}
@Override
public void onPause() {
super.onPause();
uiHelper.onPause();
isResumed = false;
}
@Override
public void onDestroy() {
super.onDestroy();
uiHelper.onDestroy();
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
uiHelper.onSaveInstanceState(outState);
}
@Override
protected void onResumeFragments() {
super.onResumeFragments();
Session session = Session.getActiveSession();
if (session != null && session.isOpened()) {
// if the session is already open,
// try to show the selection fragment
showFragment(SELECTION, false);
} else {
// otherwise present the splash screen
// and ask the person to login.
showFragment(SPLASH, false);
}
}
private void onSessionStateChange(Session session, SessionState state,
Exception exception) {
// Only make changes if the activity is visible
if (isResumed) {
FragmentManager manager = getSupportFragmentManager();
// Get the number of entries in the back stack
int backStackSize = manager.getBackStackEntryCount();
// Clear the back stack
for (int i = 0; i < backStackSize; i++) {
manager.popBackStack();
}
if (state.isOpened()) {
// If the session state is open:
// Show the authenticated fragment
showFragment(SELECTION, false);
} else if (state.isClosed()) {
// If the session state is closed:
// Show the login fragment
showFragment(SPLASH, false);
}
}
}
private UiLifecycleHelper uiHelper;
private Session.StatusCallback callback = new Session.StatusCallback() {
@Override
public void call(Session session, SessionState state,
Exception exception) {
onSessionStateChange(session, state, exception);
}
};
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
uiHelper.onActivityResult(requestCode, resultCode, data);
// Session.getActiveSession().onActivityResult(this, requestCode,
// resultCode, data);
}
}
这是我的 SelectionFragment.java 包 com.tcs.facebook；
import android.R; /*Error : Don't include android.R here; use a fully qualified name for each usage instead*/
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import com.facebook.Request;
import com.facebook.Response;
import com.facebook.Session;
import com.facebook.SessionState;
import com.facebook.UiLifecycleHelper;
import com.facebook.model.GraphUser;
import com.facebook.widget.ProfilePictureView;
public class SelectionFragment extends Fragment {
private static final String TAG = "SelectionFragment";
private ProfilePictureView profilePictureView;
private TextView userNameView;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
super.onCreateView(inflater, container, savedInstanceState);
View view = inflater.inflate(R.layout.selection, container, false); /*Error :selection cannot be resolved or is not a field*/
// Check for an open session
Session session = Session.getActiveSession();
if (session != null && session.isOpened()) {
// Get the user's data
makeMeRequest(session);
// Find the user's profile picture custom view
profilePictureView = (ProfilePictureView) /*Error : selection_profile_pic cannot be resolved or is not a field*/ view.findViewById(R.id.selection_profile_pic);
profilePictureView.setCropped(true);
// Find the user's name view
userNameView = (TextView) view.findViewById(R.id.selection_user_name); /*Error : selection_user_name cannot be resolved or is not a field*/
}
return view;
}
private void makeMeRequest(final Session session) {
// Make an API call to get user data and define a
// new callback to handle the response.
Request request = Request.newMeRequest(session,
new Request.GraphUserCallback() {
public void onCompleted1(GraphUser user, Response response) {
// If the response is successful
if (session == Session.getActiveSession()) {
if (user != null) {
// Set the id for the ProfilePictureView
// view that in turn displays the profile
// picture.
profilePictureView.setProfileId(user.getId());
// Set the Textview's text to the user's name.
userNameView.setText(user.getName());
}
}
if (response.getError() != null) {
// Handle errors, will do so later.
}
}
@Override
public void onCompleted(GraphUser user, Response response) {
// TODO Auto-generated method stub
}
});
request.executeAsync();
}
private void onSessionStateChange(final Session session,
SessionState state, Exception exception) {
if (session != null && session.isOpened()) {
// Get the user's data.
makeMeRequest(session);
}
}
private UiLifecycleHelper uiHelper;
private Session.StatusCallback callback = new Session.StatusCallback() {
@Override
public void call(final Session session, final SessionState state,
final Exception exception) {
onSessionStateChange(session, state, exception);
}
};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
uiHelper = new UiLifecycleHelper(getActivity(), callback);
uiHelper.onCreate(savedInstanceState);
}
private static final int REAUTH_ACTIVITY_CODE = 100;
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == REAUTH_ACTIVITY_CODE) {
uiHelper.onActivityResult(requestCode, resultCode, data);
}
}
@Override
public void onResume() {
super.onResume();
uiHelper.onResume();
}
@Override
public void onSaveInstanceState(Bundle bundle) {
super.onSaveInstanceState(bundle);
uiHelper.onSaveInstanceState(bundle);
}
@Override
public void onPause() {
super.onPause();
uiHelper.onPause();
}
@Override
public void onDestroy() {
super.onDestroy();
uiHelper.onDestroy();
}
}
这里是 SplashFragment.java : package com.tcs.facebook;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class SplashFragment extends Fragment{
public class SkipLoginCallback {
public void onSkipLoginPressed() {
// TODO Auto-generated method stub
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.splash, container, false); /*Error : layout cannot be resolved or is not a field*/
return view;
}
}
R.java 自动生成的文件上也有一个红色标记。