To start, and via exhaustive searching I have found that most people have this error due to improper imports of the Fragment class instead of using the support library.
I on the other hand am following a tutorial located here.
My code is essentially identical to his but I will attach my MainActivity and TimePickerDialogFragment below. The tutorial I'm following is dated August 2012 which is likely the reason I'm running into this, I could just swap tutorials but I'd really like the debug experience of correcting this and the reason as to why its occuring.
The error occurs with the code //add the fragment object to the fragment transaction
ft.add(timePicker, "time_picker");
Here is my MainActivity:
package com.stembo.android.timepickerdialogdemo;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
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 android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
public class MainActivity extends FragmentActivity {
int mHour = 15;
int mMinute = 15;
//This handles the message send from TimePickerDialogFragment (TPDF)
Handler mHandler = new Handler(){
#Override
public void handleMessage(Message m){
//create a bundle object to pass the current set time
Bundle b = m.getData();
//getting the hour of day from bundle
mHour = b.getInt("set_hour");
//getting the minute from bundle
mMinute = b.getInt("set_minute");
//displaying a short time message containing the time set by the TPDF
Toast.makeText(getBaseContext(), b.getString("set_time"),Toast.LENGTH_LONG).show();
}
};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
//click event handler for button
OnClickListener listener = new OnClickListener() {
#Override
public void onClick(View v) {
//create a bundle object to pass current time set
Bundle b = new Bundle();
//add currently set hour to bundle object
b.putInt("set_hour", mHour);
//add currently set minute to bundle object
b.putInt("set_minute", mMinute);
//instantiate TPDF
TimePickerDialogFragment timePicker = new TimePickerDialogFragment(mHandler);
//setting the bundle object on timepicker fragment
timePicker.setArguments(b);
//get a fragment manager for this activity
FragmentManager fm = getSupportFragmentManager();
//start a fragment transaction
FragmentTransaction ft = fm.beginTransaction();
//add the fragment object to the fragment transaction
ft.add(timePicker, "time_picker");
//opening the timepicker fragment
ft.commit();
}
};
//get an instance of Set button
Button btnSet = (Button)findViewById(R.id.btnSet);
btnSet.setOnClickListener(listener);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, 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();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
I don't think its needed, but here is the TimePickerDialogFragment
package com.stembo.android.timepickerdialogdemo;
import android.app.Dialog;
import android.app.DialogFragment;
import android.app.TimePickerDialog;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.widget.TimePicker;
/**
* Created by myxom on 16/02/16.
*/
public class TimePickerDialogFragment extends DialogFragment {
Handler mHandler ;
int mHour;
int mMinute;
//public TimePickerDialogFragment(){}; //solves a lint issue
public TimePickerDialogFragment(Handler h){ //another lint issue
/** Getting the reference to the message handler instantiated in MainActivity class */
mHandler = h;
}
#Override
public Dialog onCreateDialog(Bundle savedInstanceState){
/** Creating a bundle object to pass currently set time to the fragment */
Bundle b = getArguments();
/** Getting the hour of day from bundle */
mHour = b.getInt("set_hour");
/** Getting the minute of hour from bundle */
mMinute = b.getInt("set_minute");
TimePickerDialog.OnTimeSetListener listener = new TimePickerDialog.OnTimeSetListener() {
#Override
public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
mHour = hourOfDay;
mMinute = minute;
/** Creating a bundle object to pass currently set time to the fragment */
Bundle b = new Bundle();
/** Adding currently set hour to bundle object */
b.putInt("set_hour", mHour);
/** Adding currently set minute to bundle object */
b.putInt("set_minute", mMinute);
/** Adding Current time in a string to bundle object */
b.putString("set_time", "Set Time : " + Integer.toString(mHour) + " : " + Integer.toString(mMinute));
/** Creating an instance of Message */
Message m = new Message();
/** Setting bundle object on the message object m */
m.setData(b);
/** Message m is sending using the message handler instantiated in MainActivity class */
mHandler.sendMessage(m);
}
};
/** Opening the TimePickerDialog window */
return new TimePickerDialog(getActivity(), listener, mHour, mMinute, false);
}
}
The problem is with you TimePickerDialogFragment.java
Replaceimport android.app.DialogFragment withimport android.support.v4.app.DialogFragment;
Related
My first thread here - sorry if the text formatting is bad.
I use Android Studio 3.1.3 API27 and work on an app for Smartphone.
The app currently consists of 1 activity (split in 3 fragments), a second activity and 5 xml files.
By using a ViewPager, I'm able to swipe through the 3 fragments.
The 2nd fragment (middle fragment) contains 2 buttons that each open the 2nd activity, which contains many color buttons.
When clicking on the color buttons, I can change the background colors of the 1st fragment.
After choosing a color, the 2nd activity gets closed and I'm back in activity 1 -> fragment2.
It works, but the PROBLEM is that I always have to swipe to the 3rd fragment,
then back to the 2nd and then to the 1st.
If I don't do this, the colors of fragment 1 will remain the old ones.
Now I'm looking for a way to update the layout of fragment 1 as soon as I press a color button of activity 2.
I already tried this:
when writing the SharedPreferences (Activity2), I use editor.apply() instead of editor.commit()
when reading the SharedPreferences (Activity1 -> Fragment1), I use Context.MODE_MULTI_PROCESS instead of Context.MODE_PRIVATE
using viewpage.setOffscreenPageLimit(0); in the MainActivity inside of my public void SetUpViewPager(ViewPager viewpage) method.
Nothing helped, though.
This is how it looks like:
MainActivity.java (Activity 1):
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity
{
ViewPager vp;
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ViewPager vp = findViewById(R.id.vp);
SetUpViewPager(vp);
}
public void SetUpViewPager(ViewPager viewpage)
{
MyViewPagerAdapter Adapter = new MyViewPagerAdapter(getSupportFragmentManager());
Adapter.AddPageFragment(new Page_1(), "Page 1");
Adapter.AddPageFragment(new Page_2(), "Page 2");
Adapter.AddPageFragment(new Page_3(), "Page 3");
viewpage.setOffscreenPageLimit(0);
viewpage.setAdapter(Adapter);
}
public class MyViewPagerAdapter extends FragmentPagerAdapter
{
private List<Fragment> MyFragment = new ArrayList<>();
private List<String> MyPageTitle = new ArrayList<>();
public MyViewPagerAdapter(FragmentManager manager)
{
super(manager);
}
public void AddPageFragment(Fragment Frag, String Title)
{
MyFragment.add(Frag);
MyPageTitle.add(Title);
}
#Override
public Fragment getItem(int i)
{
return MyFragment.get(i);
}
#Nullable
#Override
public CharSequence getPageTitle(int position)
{
return MyPageTitle.get(position);
}
#Override
public int getCount()
{
return 3;
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu)
{
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item)
{
int id = item.getItemId();
if (id == R.id.action_settings)
{
return true;
}
return super.onOptionsItemSelected(item);
}
}
Page_1.java (Activity 1 -> Fragment 1):
import android.content.Context;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.constraint.ConstraintLayout;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.RelativeLayout;
import android.widget.TextView;
import static android.content.Context.MODE_PRIVATE;
public class Page_1 extends Fragment
{
int backgroundColorLeft, backgroundColorRight, textColorLeft, textColorRight; // Variables for SharedPreferences
#Nullable
#Override
public View onCreateView(#NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
View PageOne = inflater.inflate(R.layout.page1, container, false); // Link view to layout?
return PageOne;
}
#Override
public void onActivityCreated(#Nullable Bundle savedInstanceState)
{
SharedPreferences prefs = getActivity().getSharedPreferences("bgColor", Context.MODE_MULTI_PROCESS); // Load saved shared file
backgroundColorLeft = prefs.getInt("backgroundColorLeft", backgroundColorLeft); // Load saved background color for left layout
textColorLeft = prefs.getInt("textColorLeft", textColorLeft); // Load saved text color for left layout
backgroundColorRight = prefs.getInt("backgroundColorRight", backgroundColorRight); // Load saved background color for right layout
textColorRight = prefs.getInt("textColorRight", textColorRight); // Load saved text color for right layout
RelativeLayout relLayoutLeft = getActivity().findViewById(R.id.rel_layout_left); // Link variable to ID of left layout
relLayoutLeft.setBackgroundColor(backgroundColorLeft); // Change background color of left layout
TextView tvLeft = getActivity().findViewById(R.id.tv_left); // Link variable to ID
tvLeft.setTextColor(textColorLeft); // Change text color of left layout
RelativeLayout relLayoutRight = getActivity().findViewById(R.id.rel_layout_right); // Link variable to ID of right layout
relLayoutRight.setBackgroundColor(backgroundColorRight); // Change background color of right layout
TextView tvRight = getActivity().findViewById(R.id.tv_right); // Link variable to ID
tvRight.setTextColor(textColorRight); // Change text color of right layout
super.onActivityCreated(savedInstanceState);
}
}
Page_2.java (Activity 1 -> Fragment 2):
package com.example.konstantin.clipcodes_swiping;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.RelativeLayout;
import static android.content.Context.MODE_PRIVATE;
public class Page_2 extends Fragment
{
#Nullable
#Override
public View onCreateView(#NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
View PageTwo = inflater.inflate(R.layout.page2, container, false);
Button buttonLeft = PageTwo.findViewById(R.id.button_left); // Link variable to ID of left button
buttonLeft.setOnClickListener(new View.OnClickListener()
{
#Override
public void onClick(View v)
{
int pos = 1; // Set position to left
setPosition(pos); // Load setColor method and send 2 color values
}
});
Button buttonRight = PageTwo.findViewById(R.id.button_right); // Link variable to ID of right button
buttonRight.setOnClickListener(new View.OnClickListener()
{
#Override
public void onClick(View v)
{
int pos = 2; // Set position to right
setPosition(pos); // Load setColor method and send 2 color values
}
});
return PageTwo;
}
public void setPosition (int pos) // Start second activity to choose colors
{
Intent intentPos = new Intent(getActivity(), Page_4_Colors.class); // Create intent for current Activity and target activity
SharedPreferences prefs = getActivity().getSharedPreferences("bgColor", Context.MODE_MULTI_PROCESS); // Create new SharedPreferences instance
SharedPreferences.Editor editor = prefs.edit(); // Assign variable to editor function
editor.putInt("position", pos); // Write selected position (int) inside of editor
editor.apply(); // Save values, close process
getActivity().startActivity(intentPos); // Start second activity
}
}
Page_3.java (Activity 1 -> Fragment 3):
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class Page_3 extends Fragment
{
#Nullable
#Override
public View onCreateView(#NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
View PageThree = inflater.inflate(R.layout.page3, container, false);
return PageThree;
}
}
Page_4_Colors.java (Activity 2):
import android.app.Activity;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
public class Page_4_Colors extends Activity
{
int pos;
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.page4_colors);
SharedPreferences prefs = getSharedPreferences("bgColor", MODE_MULTI_PROCESS); // Load saved shared file
pos = prefs.getInt("position", pos); // Load saved position (int)
Log.wtf("Position", String.valueOf(pos)); // Show pos value in Log
Button buttonWhite = findViewById(R.id.button_white);
buttonWhite.setOnClickListener(new View.OnClickListener()
{
#Override
public void onClick(View v)
{
setColor(getResources().getColor(R.color.white), getResources().getColor(R.color.black)); // Load setColor method and send 2 color values
}
});
Button buttonYellow = findViewById(R.id.button_yellow);
buttonYellow.setOnClickListener(new View.OnClickListener()
{
#Override
public void onClick(View v)
{
setColor(getResources().getColor(R.color.yellow), getResources().getColor(R.color.black)); // Load setColor method and send 2 color values
}
});
Button buttonOrange = findViewById(R.id.button_orange);
buttonOrange.setOnClickListener(new View.OnClickListener()
{
#Override
public void onClick(View v)
{
setColor(getResources().getColor(R.color.orange), getResources().getColor(R.color.black)); // Load setColor method and send 2 color values
}
});
Button buttonRed = findViewById(R.id.button_red);
buttonRed.setOnClickListener(new View.OnClickListener()
{
#Override
public void onClick(View v)
{
setColor(getResources().getColor(R.color.red), getResources().getColor(R.color.black)); // Load setColor method and send 2 color values
}
});
Button buttonGreen = findViewById(R.id.button_green);
buttonGreen.setOnClickListener(new View.OnClickListener()
{
#Override
public void onClick(View v)
{
setColor(getResources().getColor(R.color.green), getResources().getColor(R.color.black)); // Load setColor method and send 2 color values
}
});
Button buttonBlue = findViewById(R.id.button_blue);
buttonBlue.setOnClickListener(new View.OnClickListener()
{
#Override
public void onClick(View v)
{
setColor(getResources().getColor(R.color.blue), getResources().getColor(R.color.white)); // Load setColor method and send 2 color values
}
});
}
public void setColor (int backgroundColor, int textColor) // Write color values into SharedPreferences
{
SharedPreferences prefs = getSharedPreferences("bgColor", MODE_MULTI_PROCESS); // Create new SharedPreferences instance
SharedPreferences.Editor editor = prefs.edit(); // Assign variable to editor function
if (pos == 1)
{
editor.putInt("backgroundColorLeft", backgroundColor); // Write background color (int) inside of editor
editor.putInt("textColorLeft", textColor); // Write text color (int) inside of editor
}
if (pos == 2)
{
editor.putInt("backgroundColorRight", backgroundColor); // Write background color (int) inside of editor
editor.putInt("textColorRight", textColor); // Write text color (int) inside of editor
}
editor.apply(); // Save values, close process
this.finish(); // Close this activity
}
}
Thanks for any help!
use EventBus
unregister and register EventBus in Page_1 onStop() and onStart()
EventBus.getDefault().unregister(this)
EventBus.getDefault().register(this)
and use this for post the value
EventBus.getDefault().post(new MessageEvent("Change Color"));
and this function will handle the MessageEvent
#Subscribe(threadMode = ThreadMode.MAIN)
public void onMessageEvent(MessageEvent event) {
//change the color here
//add this function in Page_1
}
when you update the value of color. put in MessageEvent documentation
You can update the UI (or at least the color related part) for each fragment in the onResume() method, thus, when you return from the second activity, it will refresh.
When a Fragment is made visible (i.e., the selected page in your ViewPager), its setUserVisibleHint() method is called. You can override that method in your Fragment and use it to trigger a refresh.
#Override
public void setUserVisibleHint(boolean isVisibleToUser) {
super.setUserVisibleHint(isVisibleToUser);
if(isVisibleToUser){
//you can check if the color is changed then refresh the fragment if not then don't do anything
//here you should refresh your fragment , this will called every time you
//view this fragment in all cases even if you didn't move to the
//third tab
}
}
How To Refresh A Fragment
Fragment currentFragment = getFragmentManager().findFragmentByTag("YourFragmentTag");
FragmentTransaction fragmentTransaction = getFragmentManager().beginTransaction();
fragmentTransaction.detach(currentFragment);
fragmentTransaction.attach(currentFragment);
fragmentTransaction.commit();
Closed. This question needs details or clarity. It is not currently accepting answers.
Want to improve this question? Add details and clarify the problem by editing this post.
Closed 6 years ago.
Improve this question
My task is to convert an activity to a fragment.
I did some changes but it still doesn't work. I am missing something, but I can't figure it out. One problem I do see is that the public class QuoteFragment extends SingleFregmentActivity is underline...not sure what I forget to do. Help please!
When I wan converting the activity to a fragment what did I forget?
Code for the activity...
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.LayoutInflater;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.content.Intent;
/**
* Main activity for the application.
* Displays a series of quotes
*/
public class QuoteFragment extends SingleFragmentActivity{
/** Key for fact about author stored in Intent sent to AuthorFactActivity. */
public static final String EXTRA_AUTHOR_FACT =
"edu.andrews.cptr252.stephanien.quoteoftheday.author_fact";
private static final String KEY_QUOTE_INDEX = "quoteIndex";
/**ImageView used to display inspirational image*/
private ImageView mImageView;
private TextView mQuoteTextView;
private TextView mAuthorTextView;
private Button mNextButton;
/**Quotes used in app */
private Quote[] mQuoteList = new Quote[]{
new Quote(R.string.quote_text_0, R.string.quote_author_0,
R.string.author_fact_0, R.drawable.mountain_pic),
new Quote(R.string.quote_text_1, R.string.quote_author_1,
R.string.author_fact_1, R.drawable.lier),
new Quote(R.string.quote_text_2, R.string.quote_author_2,
R.string.author_fact_2, R.drawable.math),
new Quote(R.string.quote_text_3, R.string.quote_author_3,
R.string.author_fact_3, R.drawable.smiley),
new Quote(R.string.quote_text_4, R.string.quote_author_4,
R.string.author_fact_4, R.drawable.th),
};
/** Index of current quote in list */
private int mCurrentIndex = 0;
/** Launch activity to display author fact */
private void displayAuthorFact(){
//Create intent with name of class for second activity.
//This intent will be sent to the Activity Manager in the OS
//Which will launch the activity.
Intent i = new Intent(QuoteFragment.this, AuthorFactActivity.class);
//Add extra containing resource id for fact
i.putExtra(EXTRA_AUTHOR_FACT, mQuoteList[mCurrentIndex].getAuthorFact());
//Send the intent to the activity manager.
startActivity(i);
}
/**
* Remember the current quote when the activity is destroyed
* #param savedInstanceState Bundle used for saving identity of current quote
*/
#Override
public void onSaveInstanceState(Bundle savedInstanceState) {
super.onSaveInstanceState(savedInstanceState);
//Stored the index of the current quote in the bundle.
//Use our key to access the value later.
savedInstanceState.putInt(KEY_QUOTE_INDEX, mCurrentIndex);
}
/**
* Setup and inflate layout.
* #param savedInstanceState Previously saved Bundle
*/
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
View v = inflater.inflate(R.layout.activity_fragment, container, false);
//mQuoteTextView.setText("This should generate an error. Do you see why?");
//Re-display the same quote we were on when activity destroyed
if(savedInstanceState != null){
mCurrentIndex = savedInstanceState.getInt(KEY_QUOTE_INDEX);
}
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
//setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
//Display that text for the quote
mQuoteTextView = (TextView) findViewById(R.id.quoteTextView);
int quote = mQuoteList[mCurrentIndex].getQuote();
mQuoteTextView.setText(quote);
mQuoteTextView.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v) {
displayAuthorFact();
}
});
//Display the author of the quote
mAuthorTextView = (TextView) findViewById(R.id.authorTextView);
int author = mQuoteList[mCurrentIndex].getAuthor();
mAuthorTextView.setText(author);
mAuthorTextView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
displayAuthorFact();
}
});
//Display image
mImageView = (ImageView) findViewById(R.id.imageView);
mImageView.setImageResource(R.drawable.mountain_pic);
//set up listener to handle next button presses
mNextButton = (Button) findViewById(R.id.nextButton);
mNextButton.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v) {
// move to the next quote in the list
//if index reaches end array,
//reset index to zero (first quote)
mCurrentIndex++;
if(mCurrentIndex == mQuoteList.length){
mCurrentIndex = 0;
}
updateQuote();
}
});
return v;
}
/** Display the quote at the current index. */
private void updateQuote(){
int quote = mQuoteList[mCurrentIndex].getQuote();
int author = mQuoteList[mCurrentIndex].getAuthor();
int picture = mQuoteList[mCurrentIndex].getPicture();
mQuoteTextView.setText(quote);
mAuthorTextView.setText(author);
mImageView.setImageResource(picture);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_quote, 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();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
Create QuoteFragment
Copy-paste code from QuoteActivity
Remove setContent(R.layout.activity_quote) and implement onCreateView (LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) method
Initialize views in onViewCreated (View view, Bundle savedInstanceState) method
Rename activity_quote.xml to fragment_quote.xml
Create xml file activity_quote.xml and add the QuoteFragment as a content:
<fragment android:name="com.example.android.fragments.QuoteFragment"
android:layout_width="match_parent"
android:layout_height="match_parent" />
See details here: http://developer.android.com/training/basics/fragments/creating.html#AddInLayout
And remove all code from QuoteActivity except of:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_quote);
}
I'm trying to create an activity that shows some fragments. I'm following this example here: http://developer.android.com/training/animation/screen-slide.html, however there seems to be some missing code / inconsistencies. I've narrowed down many of the problems but I'm stuck on one part, though it seems it would be simple to someone that knows how this works.
private class ScreenSlidePagerAdapter extends FragmentStatePagerAdapter {
public ScreenSlidePagerAdapter(FragmentManager fm) {
super(fm); // error on fm
}
error underlines fm on super(fm);: "FragmentStatePagerAdapter (android.support.v4.app.FragmentManager) in FragmentStatePagerAdapter cannot be applied to (android.app.FragmentManager)"
#Override
public Fragment getItem(int position) { // error on Fragment
return ScreenSlidePageFragment.create(position);
}
error underlines Fragment on public Fragment getItem(int position) {: 'getItem(int)' in 'com.example.Application.ScreenSlideActivity.ScreenSlidePagerAdapter' clashes with 'getItem(int)' in 'android.support.v4.app.FragmentStatePagerAdapter'; attempting to use incompatible return type
ScreenSlideActivity.java:
package com.example.dgzl.corvegas;
import android.app.Fragment;
import android.app.FragmentManager;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentStatePagerAdapter;
import android.support.v4.app.NavUtils;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.Menu;
import android.view.MenuItem;
/**
* Demonstrates a "screen-slide" animation using a {#link ViewPager}. Because {#link ViewPager}
* automatically plays such an animation when calling {#link ViewPager#setCurrentItem(int)}, there
* isn't any animation-specific code in this sample.
*
* <p>This sample shows a "next" button that advances the user to the next step in a wizard,
* animating the current screen out (to the left) and the next screen in (from the right). The
* reverse animation is played when the user presses the "previous" button.</p>
*
* #see ScreenSlidePageFragment
*/
public class ScreenSlideActivity extends android.support.v4.app.FragmentActivity {
/* The number of pages (wizard steps) to show in this demo.*/
private static final int NUM_PAGES = 3;
/* The pager widget, which handles animation and allows swiping horizontally to access previous
* and next wizard steps.*/
private ViewPager mPager;
/* The pager adapter, which provides the pages to the view pager widget.*/
private PagerAdapter mPagerAdapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_screen_slide);
// Instantiate a ViewPager and a PagerAdapter.
mPager = (ViewPager) findViewById(R.id.pager);
mPagerAdapter = new ScreenSlidePagerAdapter(getFragmentManager());
mPager.setAdapter(mPagerAdapter);
mPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
#Override
public void onPageSelected(int position) {
// When changing pages, reset the action bar actions since they are dependent
// on which page is currently active. An alternative approach is to have each
// fragment expose actions itself (rather than the activity exposing actions),
// but for simplicity, the activity provides the actions in this sample.
invalidateOptionsMenu();
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
super.onCreateOptionsMenu(menu);
getMenuInflater().inflate(R.menu.activity_screen_slide, menu);
menu.findItem(R.id.action_prev).setEnabled(mPager.getCurrentItem() > 0);
// Add either a "next" or "finish" button to the action bar, depending on which page
// is currently selected.
MenuItem item = menu.add(Menu.NONE, R.id.action_next, Menu.NONE,
(mPager.getCurrentItem() == mPagerAdapter.getCount() - 1)
? "action_finish"
: "action_next");
item.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM | MenuItem.SHOW_AS_ACTION_WITH_TEXT);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
// Navigate "up" the demo structure to the launchpad activity.
// See http://developer.android.com/design/patterns/navigation.html for more.
NavUtils.navigateUpTo(this, new Intent(this, MainActivity.class));
return true;
case R.id.action_previous:
// Go to the previous step in the wizard. If there is no previous step,
// setCurrentItem will do nothing.
mPager.setCurrentItem(mPager.getCurrentItem() - 1);
return true;
case R.id.action_next:
// Advance to the next step in the wizard. If there is no next step, setCurrentItem
// will do nothing.
mPager.setCurrentItem(mPager.getCurrentItem() + 1);
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A simple pager adapter that represents 5 {#link ScreenSlidePageFragment} objects, in
* sequence.
*/
private class ScreenSlidePagerAdapter extends FragmentStatePagerAdapter {
public ScreenSlidePagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
return ScreenSlidePageFragment.create(position);
}
#Override
public int getCount() {
return NUM_PAGES;
}
}
}
ScreenSlidePageFragment.java"
package com.example.Application
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
public class ScreenSlidePageFragment extends Fragment {
public static final String ARG_PAGE = "page";
private int mPageNumber;
public static ScreenSlidePageFragment create(int pageNumber) {
ScreenSlidePageFragment fragment = new ScreenSlidePageFragment();
Bundle args = new Bundle();
args.putInt(ARG_PAGE, pageNumber);
fragment.setArguments(args);
return fragment;
}
public ScreenSlidePageFragment() {
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mPageNumber = getArguments().getInt(ARG_PAGE);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout containing a title and body text.
ViewGroup rootView = (ViewGroup) inflater
.inflate(R.layout.fragment_today, container, false);
// Set the title view to show the page number.
((TextView) rootView.findViewById(android.R.id.text1)).setText(
getString(R.string.title_template_step, mPageNumber + 1));
return rootView;
}
/**
* Returns the page number represented by this fragment object.
*/
public int getPageNumber() {
return mPageNumber;
}
}
You must import Fragment and FragmentManager class from support library please change your first two lines of import like below in your ScreenSlideActivity class
import android.support.v4.app.FragmentManager
import android.support.v4.app.Fragment
I'm trying to make an app that I can get a simple implementation of in app purchases. I've been falling this guide http://www.techotopia.com/index.php/Integrating_Google_Play_In-app_Billing_into_an_Android_Application_%E2%80%93_A_Tutorial
but it's fraught with probably outdated information and neglects to include all the names of the packages you need to download from the SDK manager.
The main errors I had from this program were seemingly reference errors like I had not imported a certain library or compatibility files were missing. I managed to resolve all of them in eclipse and there are no errors when I run the code but trying it on a device or in the VM, the app crashes when I try to run it there.
I excluded the key you need for the google play connection for obvious reasons.
package com.a.inappbilling;
import com.a.inappbilling.util.IabHelper;
import com.a.inappbilling.util.IabResult;
import com.a.inappbilling.util.Inventory;
import com.a.inappbilling.util.Purchase;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.os.Build;
import android.widget.Button;
import android.content.Intent;
import android.util.Log;
public class InAppBillingActivity extends ActionBarActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_in_app_billing);
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment()).commit();
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.in_app_billing, 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);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_in_app_billing,
container, false);
return rootView;
}
}
private Button clickButton;
private Button buyButton;
#Override
protected void onStart() {
super.onStart();
buyButton = (Button)findViewById(R.id.buyButton);
clickButton = (Button)findViewById(R.id.clickButton);
clickButton.setEnabled(false);
String base64EncodedPublicKey =
"key here";
mHelper = new IabHelper(this, base64EncodedPublicKey);
mHelper.startSetup(new
IabHelper.OnIabSetupFinishedListener() {
public void onIabSetupFinished(IabResult result)
{
if (!result.isSuccess()) {
Log.d(TAG, "In-app Billing setup failed: " +
result);
} else {
Log.d(TAG, "In-app Billing is set up OK");
}
}
});
}
public void buttonClicked (View view)
{
clickButton.setEnabled(false);
buyButton.setEnabled(true);
}
private static final String TAG = "com.a.inappbilling";
IabHelper mHelper;
}
Add permission to your Manifest file
<uses-permission android:name="com.android.vending.BILLING" />
also add to your Manifest file under the Application node
<meta-data
android:name="com.google.android.gms.version"
android:value="#integer/google_play_services_version" />
Also just verify you have added InAppBillingActivity.java to your Manifest file.
I am receiving The return type is incompatible with FragmentPagerAdapter.getItem(int) for public void Fragment getItem(int position) at the bottom of the code. Error is coming from Fragment.
I have found some related topics on this error and I have tried to do them to fix the issue but nothing seems to solve the error or rather it fixes one error then 5 other errors open up, I try to fix those and again 30 errors open up. Any ideas?
I have changed import android.app.Fragment; to import android.support.v4.app.Fragment; and some other import changes and have gotten it down to this one error. Any help would be greatly appreciated. Thanks!
I included most of the code as I am not sure if I am making errors elsewhere. I believe it has to do with the import but I've tried many diff combinations and no luck.
package com.example.hellofragsandwich;
import java.util.Locale;
import android.app.Activity;
import android.app.ActionBar;
import android.support.v4.app.Fragment;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.support.v4.app.FragmentPagerAdapter;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.view.ViewPager;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
public class MainActivity extends FragmentActivity implements ActionBar.TabListener, Communicator {
public final int TOTAL_FRAGMENTS=7;
Fragment fragment_0 = new Fragment_0();
Fragment fragment_1 = new Fragment_1();
Fragment fragment_2 = new Fragment_2();
Fragment fragment_3 = new Fragment_3();
Fragment fragment_4 = new Fragment_4();
Fragment fragment_5 = new Fragment_5();
SectionsPagerAdapter mSectionsPagerAdapter;
ViewPager mViewPager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Set up the action bar.
final ActionBar actionBar = getActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
// Create the adapter that will return a fragment for each of the three
// primary sections of the activity.
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
// When swiping between different sections, select the corresponding
// tab. We can also use ActionBar.Tab#select() to do this if we have
// a reference to the Tab.
mViewPager
.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
#Override
public void onPageSelected(int position) {
actionBar.setSelectedNavigationItem(position);
}
});
// For each of the sections in the app, add a tab to the action bar.
for (int i = 0; i < mSectionsPagerAdapter.getCount(); i++) {
// Create a tab with text corresponding to the page title defined by
// the adapter. Also specify this Activity object, which implements
// the TabListener interface, as the callback (listener) for when
// this tab is selected.
actionBar.addTab(actionBar.newTab()
.setText(mSectionsPagerAdapter.getPageTitle(i))
.setTabListener(this));
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, 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);
}
#Override
public void onTabSelected(ActionBar.Tab tab,
FragmentTransaction fragmentTransaction) {
// When the given tab is selected, switch to the corresponding page in
// the ViewPager.
mViewPager.setCurrentItem(tab.getPosition());
}
#Override
public void onTabUnselected(ActionBar.Tab tab,
FragmentTransaction fragmentTransaction) {
}
#Override
public void onTabReselected(ActionBar.Tab tab,
FragmentTransaction fragmentTransaction) {
}
/**
* A {#link FragmentPagerAdapter} that returns a fragment corresponding to
* one of the sections/tabs/pages.
*/
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given page.
// Return a PlaceholderFragment (defined as a static inner class
// below).
Fragment fragment = null;
switch (position) {
case 0:
return fragment_0;
case 1:
return fragment_1;
case 2:
return fragment_2;
case 3:
return fragment_3;
case 4:
return fragment_4;
case 5:
return fragment_5;
case 6:
return fragment_6;
}
return fragment;
}
}
If you are using import android.support.v13.app.FragmentPagerAdapter; from v13 support library you should use android.app.Fragment not v4 one. (with v13 you should use getFragmentManager())
Or if you want to use android.support.v4.app.Fragment you should use android.support.v4.app.FragmentPagerAdapter not v13 one (with v4 fragment you should use getSupportFragmentManager())