当用户第一次访问我的应用程序时，我有一个登录片段我曾经拿它的用户名和密码并将其保存到SharedPref。所以下次他不需要再次输入用户名和密码。
但是发生了什么事情并没有显示任何事情它只是显示一个空白活动，即使它没有显示的布局设计。
我的登录FragmentActivity代码
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;
}
}
的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>
我收到此异常
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;
}
}
问题是它显示空白页面
答案 0 :(得分：0)
你的类应该是这样的（FragmentActivity没有OnCreateView方法，它有OnCreate方法）所以只需将方法OnCrateView更改为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();
}
}
}
});
}
}
答案 1 :(得分：0)
由于您的static final String[] DASHBOARD_LINKS = new String[] { };数组不包含任何值，因此这不是将任何数据绑定到GridView的原因。
将一些数据添加到String数组中，然后将其绑定到GridView适配器。