i have sorted many solutions online but non seem to work. when ever I declare a button within on of the tab fragments, my app crashes before the holding activity starts please help me. Here's my code.
//this is the code for the containing activity with tabs
public class Dashboard extends FragmentActivity implements ActionBar.TabListener{
private Context ctx = this;
ActionBar AB;
ViewPager VP;
FragmentPageAdapter FP;
String note, timestamp;
EditText NOTE;
Button save;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_dashboard);
Intent intent = getIntent();
String name = intent.getStringExtra("u_name");
VP = (ViewPager) findViewById(R.id.pager);
FP = new FragmentPageAdapter(getSupportFragmentManager());
AB = getActionBar();
VP.setAdapter(FP);
AB.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
AB.addTab(AB.newTab().setText("Notes").setTabListener(this));
AB.addTab(AB.newTab().setText("Contacts").setTabListener(this));
AB.addTab(AB.newTab().setText("Schedular").setTabListener(this));
Toast.makeText(getBaseContext(), "welcome " + name, Toast.LENGTH_LONG).show();
VP.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageSelected(int arg0) {
AB.setSelectedNavigationItem(arg0);
}
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
// TODO Auto-generated method stub
}
@Override
public void onPageScrollStateChanged(int arg0) {
// TODO Auto-generated method stub
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.dashboard, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle item selection
switch (item.getItemId()) {
case R.id.item_change:
change_password();
return true;
case R.id.item_burn:
burn_diary();
return true;
case R.id.item_exit:
exit();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
public void burn_diary() {
Button burn, cancel;
final EditText DIALOG_USER;
final EditText DIALOG_PASS;
final Dialog custom = new Dialog(this);
custom.setTitle("Burn Diary");
custom.setContentView(R.layout.dialog_burn);
DIALOG_USER = (EditText) custom.findViewById(R.id.burn_username);
DIALOG_PASS = (EditText) custom.findViewById(R.id.burn_password);
burn = (Button) custom.findViewById(R.id.burn);
cancel = (Button) custom.findViewById(R.id.cancel);
burn.setOnClickListener(new OnClickListener(){
Intent intent = getIntent();
String name = intent.getStringExtra("u_name");
@Override
public void onClick(View arg0) {
String dialog_user = DIALOG_USER.getText().toString();
String dialog_pass = DIALOG_PASS.getText().toString();
DatabaseOperations DOP = new DatabaseOperations(ctx);
Cursor CR = DOP.getInformation(DOP);
CR.moveToFirst();
boolean burnStatus = false;
do
{
if (dialog_user.equals(CR.getString(0)) && dialog_pass.equals(CR.getString(1)) && !(dialog_user.equals("") || dialog_pass.equals("")) && name.equals(dialog_user))
{
burnStatus = true;
}
}while(CR.moveToNext());
if (burnStatus == true)
{
DOP.deleteUser(DOP, dialog_user, dialog_pass);
Toast.makeText(getBaseContext(), "diary burnt successful", Toast.LENGTH_SHORT).show();
finish();
}
else
{
if((dialog_user.equals("") || dialog_pass.equals("")))
{
Toast.makeText(getBaseContext(), "complete all fields", Toast.LENGTH_SHORT).show();
}
else
{
Toast.makeText(getBaseContext(), "burn diary fail", Toast.LENGTH_SHORT).show();
DIALOG_USER.setText("");
DIALOG_PASS.setText("");
}
}
}
});
cancel.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View arg0) {
custom.dismiss();
}
});
custom.show();
}
public void change_password() {
Button change, cancel;
final EditText DIALOG_CURRENTPASS, DIALOG_NEWPASS;
final Dialog custom = new Dialog(this);
custom.setTitle("Change Password");
custom.setContentView(R.layout.dialog_change);
DIALOG_CURRENTPASS = (EditText) custom.findViewById(R.id.change_currentPassword);
DIALOG_NEWPASS = (EditText) custom.findViewById(R.id.change_newPassword);
change = (Button) custom.findViewById(R.id.button_change);
cancel = (Button) custom.findViewById(R.id.button_cancel);
change.setOnClickListener(new OnClickListener(){
Intent intent = getIntent();
String name = intent.getStringExtra("u_name");
@Override
public void onClick(View arg0) {
String current_pass = DIALOG_CURRENTPASS.getText().toString();
String new_pass = DIALOG_NEWPASS.getText().toString();
DatabaseOperations DOP = new DatabaseOperations(ctx);
Cursor CR = DOP.getInformation(DOP);
CR.moveToFirst();
boolean changeStatus = false;
do
{
if (current_pass.equals(CR.getString(1)) && !(current_pass.equals("") || new_pass.equals("")) && !(current_pass.equals(new_pass)) && name.equals(CR.getString(0)))
{
changeStatus = true;
}
}while(CR.moveToNext());
if (changeStatus == true)
{
DOP.updatePassword(DOP, name, current_pass, new_pass);
Toast.makeText(getBaseContext(), "credentials change successful", Toast.LENGTH_SHORT).show();
custom.dismiss();
}
else
{
}
}
});
cancel.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View arg0) {
custom.dismiss();
}
});
custom.show();
}
private void exit()
{
Intent intent = new Intent(getApplicationContext(), MainActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
intent.putExtra("EXIT", true);
startActivity(intent);
}
@Override
public void onTabReselected(Tab arg0, FragmentTransaction arg1) {
// TODO Auto-generated method stub
}
@Override
public void onTabSelected(Tab arg0, FragmentTransaction arg1) {
VP.setCurrentItem(arg0.getPosition());
}
@Override
public void onTabUnselected(Tab arg0, FragmentTransaction arg1) {
// TODO Auto-generated method stub
}
}
//this the code for the fragment adapter
public class FragmentPageAdapter extends FragmentPagerAdapter {
public FragmentPageAdapter(FragmentManager fm) {
super(fm);
// TODO Auto-generated constructor stub
}
@Override
public Fragment getItem(int arg0) {
switch (arg0)
{
case 0:
return new NoteFragment();
case 1:
return new ContactFragment();
case 2:
return new SchedulerFragment();
default:
break;
}
return null;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return 3;
}
}
//this is the code for the first tab fragment
public class NoteFragment extends Fragment{
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
View v;
v = inflater.inflate(R.layout.notelayout, container, false);
Button save = (Button) v.findViewById(R.id.saveButton);
save.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//Implement the code to run on button click here
}
});
return v;
}
}
//this is the code for the second tab fragment
public class ContactFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
return inflater.inflate(R.layout.contactlayout, container, false);
}
}
//this this the code for the third tab fragment
public class SchedulerFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
return inflater.inflate(R.layout.schedulerlayout, container, false);
}
}
//this is the code for the first tab fragment xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<EditText
android:id="@+id/note"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignTop="@+id/saveButton"
android:layout_toLeftOf="@+id/saveButton"
android:ems="10"
android:hint="type a note"
android:paddingBottom="1dp" />
<ImageButton
android:id="@+id/saveButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:src="@drawable/ic_action_name" />
<ListView
android:id="@+id/noteView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_above="@+id/note"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true" >
</ListView>
</RelativeLayout>
Here is the LogCat
09-29 20:58:51.403: D/Databsse operations(797): Database created
09-29 20:58:53.202: D/Databsse operations(797): One row inserted
09-29 20:58:54.271: D/gralloc_goldfish(797): Emulator without GPU emulation detected.
09-29 21:00:07.152: D/dalvikvm(797): GC_CONCURRENT freed 67K, 7% free 2719K/2908K, paused 82ms+22ms, total 561ms
09-29 21:00:07.492: I/Choreographer(797): Skipped 53 frames! The application may be doing too much work on its main thread.
09-29 21:00:26.392: D/Databsse operations(797): Database created
09-29 21:00:26.501: D/Databsse operations(797): Table combed
09-29 21:00:26.722: I/Choreographer(797): Skipped 43 frames! The application may be doing too much work on its main thread.
09-29 21:00:27.552: D/dalvikvm(797): GC_FOR_ALLOC freed 187K, 10% free 2894K/3204K, paused 111ms, total 122ms
09-29 21:00:27.602: I/dalvikvm-heap(797): Grow heap (frag case) to 3.547MB for 635812-byte allocation
09-29 21:00:27.893: D/dalvikvm(797): GC_FOR_ALLOC freed 2K, 9% free 3512K/3828K, paused 294ms, total 295ms
09-29 21:00:28.192: D/dalvikvm(797): GC_CONCURRENT freed 34K, 9% free 3512K/3828K, paused 9ms+65ms, total 300ms
09-29 21:00:29.062: D/AndroidRuntime(797): Shutting down VM
09-29 21:00:29.082: W/dalvikvm(797): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
09-29 21:00:29.272: E/AndroidRuntime(797): FATAL EXCEPTION: main
09-29 21:00:29.272: E/AndroidRuntime(797): java.lang.ClassCastException: android.widget.ImageButton cannot be cast to android.widget.Button
09-29 21:00:29.272: E/AndroidRuntime(797): at com.example.databank.NoteFragment.onCreateView(NoteFragment.java:17)
09-29 21:00:29.272: E/AndroidRuntime(797): at android.support.v4.app.Fragment.performCreateView(Fragment.java:1460)
09-29 21:00:29.272: E/AndroidRuntime(797): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:911)
09-29 21:00:29.272: E/AndroidRuntime(797): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1088)
09-29 21:00:29.272: E/AndroidRuntime(797): at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
09-29 21:00:29.272: E/AndroidRuntime(797): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1444)
09-29 21:00:29.272: E/AndroidRuntime(797): at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:461)
09-29 21:00:29.272: E/AndroidRuntime(797): at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:141)
09-29 21:00:29.272: E/AndroidRuntime(797): at android.support.v4.view.ViewPager.populate(ViewPager.java:1011)
09-29 21:00:29.272: E/AndroidRuntime(797): at android.support.v4.view.ViewPager.populate(ViewPager.java:880)
09-29 21:00:29.272: E/AndroidRuntime(797): at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1374)
09-29 21:00:29.272: E/AndroidRuntime(797): at android.view.View.measure(View.java:15518)
09-29 21:00:29.272: E/AndroidRuntime(797): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825)
09-29 21:00:29.272: E/AndroidRuntime(797): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
09-29 21:00:29.272: E/AndroidRuntime(797): at android.view.View.measure(View.java:15518)
09-29 21:00:29.272: E/AndroidRuntime(797): at android.widget.LinearLayout.measureVertical(LinearLayout.java:847)
09-29 21:00:29.272: E/AndroidRuntime(797): at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
09-29 21:00:29.272: E/AndroidRuntime(797): at android.view.View.measure(View.java:15518)
09-29 21:00:29.272: E/AndroidRuntime(797): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825)
09-29 21:00:29.272: E/AndroidRuntime(797): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
09-29 21:00:29.272: E/AndroidRuntime(797): at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2176)
09-29 21:00:29.272: E/AndroidRuntime(797): at android.view.View.measure(View.java:15518)
09-29 21:00:29.272: E/AndroidRuntime(797): at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1874)
09-29 21:00:29.272: E/AndroidRuntime(797): at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1089)
09-29 21:00:29.272: E/AndroidRuntime(797): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1265)
09-29 21:00:29.272: E/AndroidRuntime(797): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:989)
09-29 21:00:29.272: E/AndroidRuntime(797): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4351)
09-29 21:00:29.272: E/AndroidRuntime(797): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749)
09-29 21:00:29.272: E/AndroidRuntime(797): at android.view.Choreographer.doCallbacks(Choreographer.java:562)
09-29 21:00:29.272: E/AndroidRuntime(797): at android.view.Choreographer.doFrame(Choreographer.java:532)
09-29 21:00:29.272: E/AndroidRuntime(797): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735)
09-29 21:00:29.272: E/AndroidRuntime(797): at android.os.Handler.handleCallback(Handler.java:725)
09-29 21:00:29.272: E/AndroidRuntime(797): at android.os.Handler.dispatchMessage(Handler.java:92)
09-29 21:00:29.272: E/AndroidRuntime(797): at android.os.Looper.loop(Looper.java:137)
09-29 21:00:29.272: E/AndroidRuntime(797): at android.app.ActivityThread.main(ActivityThread.java:5041)
09-29 21:00:29.272: E/AndroidRuntime(797): at java.lang.reflect.Method.invokeNative(Native Method)
09-29 21:00:29.272: E/AndroidRuntime(797): at java.lang.reflect.Method.invoke(Method.java:511)
09-29 21:00:29.272: E/AndroidRuntime(797): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
09-29 21:00:29.272: E/AndroidRuntime(797): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
09-29 21:00:29.272: E/AndroidRuntime(797): at dalvik.system.NativeStart.main(Native Method)
In NoteFragment, you're trying to cast an ImageButton to a Button.
Despite the name, ImageButton isn't a subclass of Button, it actually extends ImageView.
Change your line to this:
ImageButton save = (ImageButton) v.findViewById(R.id.saveButton);
Or, even just this if you don't intend to change the icon or anything:
View save = v.findViewById(R.id.saveButton);