Frammento non iniziando altri frammenti in Android

Question

Ho un frammento di accesso Quando l'utente arriva la prima volta alla mia applicazione che ho usato per prendere il suo nome utente e una password e salvarlo in SharedPref.so che la prossima volta che non è necessario inserire di nuovo il nome utente e la password.

Ma cosa sta succedendo non sta mostrando alcuna cosa che sta solo mostrando un'attività vuota anche il design del layout che non è mostrato.

Il mio codice di frammentazione login

public class Login extends FragmentActivity {
    public static String url = "";
    public static ProgressDialog progressDialog;
    EditText username, password;
    TextView error;
    ImageView ok;
    static String AppResponse = null;
    ProgressDialog pd;
    private Fragment dashboardFragment;
    View rootView = null;

    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {

        SharedPreferences shared = getSharedPreferences("shared", MODE_PRIVATE);
        dashboardFragment = new DashBoardFragment();
        if (shared.contains("username") && shared.contains("password")) {

            startingActivity();
        } else {
            progressDialog = new ProgressDialog(this);
            progressDialog.setMessage("Please Wait Validating .!!!");
            progressDialog.setIndeterminate(false);
            progressDialog.setProgressStyle(ProgressDialog.THEME_HOLO_DARK);
            progressDialog.setCancelable(false);
            rootView = inflater.inflate(R.layout.activity_login, container,
                    false);
            username = (EditText) rootView.findViewById(R.id.textUserName);
            password = (EditText) rootView.findViewById(R.id.textPassword);
            ok = (ImageView) rootView.findViewById(R.id.btn_login);
            error = (TextView) rootView.findViewById(R.id.error_view);
            pd = new ProgressDialog(this);
            pd.setMessage("Logging In");
            ok.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    String pass = password.getText().toString();
                    String userId = username.getText().toString();
                    boolean isConnected = isNetworkConnected(Login.this);
                    Log.d("Network Status", "Status is " + isConnected);
                    if (userId.equals("") || pass.equals("")) {
                        error.setText("Please provide UserName and Password...!!!!!");
                    } else {
                        if (isConnected) {
                            postHttpRequest(userId, pass, error);
                        } else {
                            Toast.makeText(getApplicationContext(),
                                    "No Network Connection", Toast.LENGTH_LONG)
                                    .show();
                        }
                    }
                }
            });
        }
        return rootView;
    }

.

Startactivity

public void startingActivity() {
        FragmentTransaction fragTran = getSupportFragmentManager()
                .beginTransaction();
        fragTran.replace(R.id.content_frame, dashboardFragment);
        fragTran.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
        fragTran.addToBackStack(null);
        fragTran.commit();
    }

.

DashboardFragment

public class DashBoardFragment extends Fragment {
    GridView gridView;
    static final String[] DASHBOARD_LINKS = new String[] { };
    private Fragment approvalStatusFragment;
    private Fragment pendingApprovalsFragment;
    private Fragment flghtBookingFragment;
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.activity_dash_board,
                container, false);
        gridView = (GridView) rootView.findViewById(R.id.my_grid_view);
        gridView.setAdapter(new ImageAdapter(getActivity(), DASHBOARD_LINKS));

        approvalStatusFragment = new ApprovalStatus();
        pendingApprovalsFragment = new PendingApprovals();
        flghtBookingFragment = new FlightBooking();

        final FragmentTransaction fragTran = getFragmentManager()
                .beginTransaction();

        gridView.setOnItemClickListener(new OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> arg0, View v, int arg2,
                    long arg3) {
                if (DASHBOARD_LINKS[arg2].equals("Approvals")) {
                    fragTran.replace(R.id.content_frame, pendingApprovalsFragment);
                    fragTran.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
                    fragTran.addToBackStack(null);
                    fragTran.commit();
                }
                if (DASHBOARD_LINKS[arg2].equals("Flights")) {
                    fragTran.replace(R.id.content_frame, flghtBookingFragment);
                    fragTran.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
                    fragTran.addToBackStack(null);
                    fragTran.commit();
                }
                if (DASHBOARD_LINKS[arg2].equals("Trips")) {
                    fragTran.replace(R.id.content_frame, approvalStatusFragment);
                    fragTran.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
                    fragTran.addToBackStack(null);
                    fragTran.commit();
                }
            }
        });
        return rootView;
    }
}

.

manifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.iween.newinfiniteapp"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />

    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

   <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.Login"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

.

Sto ricevendo questa eccezione

01-09 11:26:01.162: E/AndroidRuntime(4164): FATAL EXCEPTION: main
01-09 11:26:01.162: E/AndroidRuntime(4164): java.lang.IllegalArgumentException: No view found for id 0x7f09001e (com.iween.newinfiniteapp:id/content_frame) for fragment DashBoardFragment{412cfcf8 #0 id=0x7f09001e}
01-09 11:26:01.162: E/AndroidRuntime(4164):     at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:919)
01-09 11:26:01.162: E/AndroidRuntime(4164):     at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104)
01-09 11:26:01.162: E/AndroidRuntime(4164):     at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
01-09 11:26:01.162: E/AndroidRuntime(4164):     at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1467)
01-09 11:26:01.162: E/AndroidRuntime(4164):     at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:440)
01-09 11:26:01.162: E/AndroidRuntime(4164):     at android.os.Handler.handleCallback(Handler.java:800)
01-09 11:26:01.162: E/AndroidRuntime(4164):     at android.os.Handler.dispatchMessage(Handler.java:100)
01-09 11:26:01.162: E/AndroidRuntime(4164):     at android.os.Looper.loop(Looper.java:194)
01-09 11:26:01.162: E/AndroidRuntime(4164):     at android.app.ActivityThread.main(ActivityThread.java:5371)
01-09 11:26:01.162: E/AndroidRuntime(4164):     at java.lang.reflect.Method.invokeNative(Native Method)
01-09 11:26:01.162: E/AndroidRuntime(4164):     at java.lang.reflect.Method.invoke(Method.java:525)
01-09 11:26:01.162: E/AndroidRuntime(4164):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:833)
01-09 11:26:01.162: E/AndroidRuntime(4164):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
01-09 11:26:01.162: E/AndroidRuntime(4164):     at dalvik.system.NativeStart.main(Native Method)

.

* mainfragment *

public class MainFragment extends FragmentActivity {
    // Within which the entire activity is enclosed
    private DrawerLayout mDrawerLayout;

    // ListView represents Navigation Drawer
    private ListView mDrawerList;
    private Fragment dashboardFragment;

    // ActionBarDrawerToggle indicates the presence of Navigation Drawer in the
    // action bar
    private ActionBarDrawerToggle mDrawerToggle;

    // Title of the action bar
    private String mTitle = "";

    @SuppressLint("NewApi")
    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main_fragment);


        dashboardFragment = new DashBoardFragment();


        mTitle = "Infinite Travels";
        getActionBar().setTitle(mTitle);
        getActionBar().setIcon(android.R.color.transparent);

        // Getting reference to the DrawerLayout
        mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
        mDrawerList = (ListView) findViewById(R.id.drawer_list);

        // Getting reference to the ActionBarDrawerToggle
        mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout,
                R.drawable.white_bar, R.string.drawer_open,
                R.string.drawer_close) {

            /** Called when drawer is closed */
            public void onDrawerClosed(View view) {
                getActionBar().setTitle(mTitle);
                invalidateOptionsMenu();
            }

            /** Called when a drawer is opened */
            public void onDrawerOpened(View drawerView) {
                // getActionBar().setTitle("");
                invalidateOptionsMenu();
            }
        };

        // Setting DrawerToggle on DrawerLayout
        mDrawerLayout.setDrawerListener(mDrawerToggle);
        if (savedInstanceState == null) {
            getUrl(0);
        }
        // Creating an ArrayAdapter to add items to the listview mDrawerList
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(
                getBaseContext(), R.layout.drawer_list_item, getResources()
                        .getStringArray(R.array.menus));

        // Setting the adapter on mDrawerList
        mDrawerList.setAdapter(adapter);

        // Enabling Home button
        getActionBar().setHomeButtonEnabled(true);

        // Enabling Up navigation
        getActionBar().setDisplayHomeAsUpEnabled(true);

        // Setting item click listener for the listview mDrawerList
        mDrawerList.setOnItemClickListener(new OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {
                // Getting an array of rivers
                String[] menuItems = getResources().getStringArray(
                        R.array.menus);

                // Currently selected river
                mTitle = menuItems[position];
                getUrl(position);

                // Closing the drawer
                mDrawerLayout.closeDrawer(mDrawerList);
            }
        });
    }

    @SuppressLint("Recycle")
    protected void getUrl(int position) {
        FragmentTransaction fragTran = getSupportFragmentManager()
                .beginTransaction();
        switch (position) {
        case 0:
            fragTran.replace(R.id.content_frame, dashboardFragment);
            fragTran.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
            fragTran.addToBackStack(null);
            fragTran.commit();
            break;
        case 1:

        case 2:

        case 3:
            // return "";
        case 4:

        case 5:

        case 6:
            // return "";
        default:
            // return "";
        }
    }

    @Override
    protected void onPostCreate(Bundle savedInstanceState) {
        super.onPostCreate(savedInstanceState);
        mDrawerToggle.syncState();
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        if (mDrawerToggle.onOptionsItemSelected(item)) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    /**
     * Called whenever we call invalidateOptionsMenu()
     * */
    @Override
    public boolean onPrepareOptionsMenu(Menu menu) {
        // If the drawer is open, hide action items related to the content view
        boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);

        menu.findItem(R.id.action_settings).setVisible(!drawerOpen);
        return super.onPrepareOptionsMenu(menu);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
}

.

Il problema è che sta mostrando una pagina vuota

Answer 1

La tua classe dovrebbe essere come questa (frammentattività non ha il metodo OnCreateView ha il metodo ONCreate) quindi basta cambiare il metodo OnCrateView per ONCreate.

public class Login extends FragmentActivity {
        public static String url = "";
        public static ProgressDialog progressDialog;
        EditText username, password;
        TextView error;
        ImageView ok;
        static String AppResponse = null;
        ProgressDialog pd;
        private Fragment dashboardFragment;
        View rootView = null;
        @Override
        protected Void onCreate(Bundle savedInstanceState) {

            SharedPreferences shared = getSharedPreferences("shared", MODE_PRIVATE);
            dashboardFragment = new DashBoardFragment();
            if (shared.contains("username") && shared.contains("password")) {

                startingActivity();
            } else {
                progressDialog = new ProgressDialog(this);
                progressDialog.setMessage("Please Wait Validating .!!!");
                progressDialog.setIndeterminate(false);
                progressDialog.setProgressStyle(ProgressDialog.THEME_HOLO_DARK);
                progressDialog.setCancelable(false);
                setContentView(R.layout.activity_login);

                username = (EditText) findViewById(R.id.textUserName);
                password = (EditText) findViewById(R.id.textPassword);
                ok = (ImageView) findViewById(R.id.btn_login);
                error = (TextView) findViewById(R.id.error_view);
                pd = new ProgressDialog(this);
                pd.setMessage("Logging In");
                ok.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        String pass = password.getText().toString();
                        String userId = username.getText().toString();
                        boolean isConnected = isNetworkConnected(Login.this);
                        Log.d("Network Status", "Status is " + isConnected);
                        if (userId.equals("") || pass.equals("")) {
                            error.setText("Please provide UserName and Password...!!!!!");
                        } else {
                            if (isConnected) {
                                postHttpRequest(userId, pass, error);
                            } else {
                                Toast.makeText(getApplicationContext(),
                                        "No Network Connection", Toast.LENGTH_LONG)
                                        .show();
                            }
                        }
                    }
                });
            }

        }

.

Answer 2

Poiché il tuo array static final String[] DASHBOARD_LINKS = new String[] { }; non contiene valori in modo che non sia il motivo per cui vincolando qualsiasi dato nel GridView.

Aggiungi alcuni dati nell'array stringa e quindi legarlo nell'adattatore GridView.