I have an Activity that lays out ListFragments side by side (as many as a user wants) in a HorizontalScrollView upon choosing an option in the ActionBar.
Each ListFragment item contains TextViews and a Button. A SimpleAdapter populates data for each item in every ListFragment.
The issue I am facing now is that the buttons in each list item do not respond to clicks. The layout can be summarized as follows: Button inside a ListFragment inside a FragmentActivity, going from the innermost child element to the parent at the root view.
I have spent many hours on this problem and I am unable to arrive at a solution to make the buttons respond to clicks. Some of the approaches I have used include obtaining the button's view and attaching onClickListeners, 2) implementing the OnClickListener interface for the ListFragment. I am also aware of the onInterceptTouchEvent method for a ViewGroup class, however my lack of experience with Android prevents me from arriving at a solution. Any guidance or direction towards solving this problem would be most appreciated.
Here is the code for the ListFragment:
package com.example.androidlistfragmenttest;
import java.util.ArrayList;
import java.util.HashMap;
import android.os.Bundle;
import android.support.v4.app.ListFragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.SimpleAdapter;
public class MyFragment extends ListFragment {
private ArrayList<HashMap<String,String>> arraylist;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_layout, container, false);
Button button = (Button) view.findViewById(R.id.button);
button.setOnClickListener(new OnClickListener(){
//THIS DOES NOT PRINT IN LOGCAT. BUTTON DOES NOT RESPOND TO CLICKS.
#Override
public void onClick(View arg0) {
Log.v("GODZILLA","ATOMIC BREATH");
}
});
return view;
}
#Override
public void onActivityCreated(Bundle savedInstanceState){
super.onActivityCreated(savedInstanceState);
arraylist = dataGenerator();
SimpleAdapter adapter = new SimpleAdapter(getActivity().getApplicationContext(), arraylist, R.layout.fragment_layout,new String[]{"KEY"},new int[]{R.id.text_id});
setListAdapter(adapter);
}
/*
* Method to populate an adapter's data list.
*/
public ArrayList<HashMap<String,String>> dataGenerator(){
HashMap<String,String> hashMap1 = new HashMap<String,String>();
hashMap1.put("KEY", "A");
HashMap<String,String> hashMap2 = new HashMap<String,String>();
hashMap2.put("KEY", "B");
HashMap<String,String> hashMap3 = new HashMap<String,String>();
hashMap3.put("KEY", "C");
HashMap<String,String> hashMap4 = new HashMap<String,String>();
hashMap4.put("KEY", "D");
HashMap<String,String> hashMap5 = new HashMap<String,String>();
hashMap5.put("KEY", "E");
ArrayList<HashMap<String,String>> arraylist = new ArrayList<HashMap<String,String>>();
arraylist.add(hashMap1);
arraylist.add(hashMap2);
arraylist.add(hashMap3);
arraylist.add(hashMap4);
arraylist.add(hashMap5);
return arraylist;
}
} //End of MyFragment
And this is the code for the Activity containing the Fragment(s):
package com.example.androidlistfragmenttest;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Stack;
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.support.v4.app.NavUtils;
import android.view.Menu;
import android.view.MenuItem;
public class MainActivity extends FragmentActivity {
private Stack<String> tagStack;
private Integer last_tag_number;
public MainActivity(){
last_tag_number = new Integer("0");
tagStack = new Stack<String>();
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
#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) {
switch (item.getItemId()) {
case R.id.add_fragment:
addColumn();
return true;
case R.id.remove_column:
removeColumn();
return true;
case android.R.id.home:
// This ID represents the Home or Up button. In the case of this
// activity, the Up button is shown. Use NavUtils to allow users
// to navigate up one level in the application structure. For
// more details, see the Navigation pattern on Android Design:
//
// http://developer.android.com/design/patterns/navigation.html#up-vs-back
//
NavUtils.navigateUpFromSameTask(this);
return true;
}
return super.onOptionsItemSelected(item);
}
/*
* This method adds a fragment to the screen
*/
public void addColumn(){
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
MyFragment fragment = new MyFragment();
fragmentTransaction.add(R.id.fragment_activity, fragment,tagGenerator());
fragmentTransaction.commit();
}
/*
* This method removes a fragment from the screen
*/
public void removeColumn(){
if(tagStack.size() != 0){
FragmentManager fragmentManager = getSupportFragmentManager();
Fragment fragment = fragmentManager.findFragmentByTag(tagStack.pop());
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.remove(fragment);
fragmentTransaction.commit();
}
}
/*
* This function generates tags for each fragment that is displayed on the screen
* The tags pose as unique identifiers for each fragment
*/
public String tagGenerator(){
Integer tag_number;
if(last_tag_number.intValue() == 0){
tag_number = last_tag_number;
int temp = last_tag_number.intValue();
temp+=1;
last_tag_number = Integer.valueOf(temp);
}
else{
tag_number = new Integer(last_tag_number.intValue());
int temp = last_tag_number.intValue();
temp+=1;
last_tag_number = Integer.valueOf(temp);
}
String tag = tag_number.toString();
tagStack.push(tag);
return tag;
}
} //End of MainActivity
As well as the layouts for the FragmentActivity:
<?xml version="1.0" encoding="utf-8"?>
<HorizontalScrollView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<LinearLayout
android:id="#+id/fragment_activity"
android:layout_width="fill_parent"
android:layout_height = "fill_parent"
android:orientation = "horizontal"
android:gravity="center"
>
</LinearLayout>
</HorizontalScrollView>
And the ListFragment:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="300dp"
android:layout_height="match_parent"
android:orientation="vertical"
android:layout_weight="1"
android:layout_margin="5dp"
android:descendantFocusability="blocksDescendants" >
<ListView android:id="#id/android:list"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal"
android:layout_gravity="center" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/label"
android:layout_gravity="start"
/>
<TextView
android:id="#+id/text_id"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:layout_gravity="end"
/>
</LinearLayout>
<LinearLayout
android:layout_height="match_parent"
android:layout_width="match_parent"
android:orientation="horizontal" >
<Button
android:id="#+id/button"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:text="#string/button"
android:layout_margin="2dp"
android:layout_marginLeft="2dp"
android:layout_marginRight="2dp"
/>
</LinearLayout>
</LinearLayout>
The problem is that the ListItem is consuming the click and it is not getting passed to the button below.
You need to set the list items to inactive and handle the clicks yourself. In your custom Adapter add the following methods to disable the items (They override methods from BaseAdapter):
#Override
public boolean areAllItemsEnabled() {
return false;
}
#Override
public boolean isEnabled(int position) {
return false;
}
Edit: Here is a related question that may offer a better solution, it depends on your design.
Related
I have researched a lot on SharedElement Transitions , however I could only find Transitions for onclick event.
I want the animation between Fragments where the speed of animation is controlled by the user's scrolling speed. If the user stops in between while scrolling the objects should be still.
Example :
In this image , the viewpager is in the middle of screen1 and screen2 and the animating objects are in stopped state.
These objects move from one screen to another and also change their positions.
The translation animations part I have figured out but how to achieve this shared element transition with viewpager between fragments. And moreover it should scroll/animate with the speed of finger swipe.
MainActivity.java
package com.karan.onboardanimation;
import android.os.Bundle;
import android.support.v4.app.FragmentManager;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
public class MainActivity extends AppCompatActivity {
private static final String TAG = "MainActivity";
private MyFragmentPagerAdapter pagerAdapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Log.d(TAG, "onCreate: ");
ViewPager pager = (ViewPager) findViewById(R.id.pager);
FragmentManager fm = getSupportFragmentManager();
pagerAdapter = new MyFragmentPagerAdapter(fm);
pager.setAdapter(pagerAdapter);
pager.setCurrentItem(0);
}
}
FirstFragment.java- This fragment has an imageview which has to shared with second fragment when user is swiping on the viewpager.
package com.karan.onboardanimation;
import android.app.ActivityOptions;
import android.os.Build;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
public class FirstFragment extends Fragment {
private static final String TAG = "FirstFragment";
ImageView imageView;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (Build.VERSION.SDK_INT >= 21){
}
Log.d(TAG, "onCreate: ");
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
Log.d(TAG, "onCreateView: ");
View view = inflater.inflate(R.layout.first_fragment, container, false);
imageView = (ImageView) view.findViewById(R.id.img1);
ViewPagerTransformer viewPagerTransformer = new ViewPagerTransformer();
viewPagerTransformer.transformPage(imageView, 1);
return view;
}
}
MyFragmentPagerAdapter.java
package com.karan.onboardanimation;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.util.Log;
class MyFragmentPagerAdapter extends FragmentPagerAdapter {
private static final String TAG = "MyFragmentPagerAdapter";
final int PAGE_COUNT = 2;
public MyFragmentPagerAdapter(FragmentManager fm) {
super(fm);
Log.d(TAG, "MyFragmentPagerAdapter: ");
}
#Override
public Fragment getItem(int position) {
Log.d(TAG, "getItem: ");
switch (position) {
case 0:
return new FirstFragment();
case 1:
return new SecondFragment();
default:
return null;
}
}
#Override
public int getCount() {
return PAGE_COUNT;
}
}
second_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"
android:background="#d02030"
android:orientation="vertical">
<ImageView
android:id="#+id/img2"
android:layout_width="100dp"
android:layout_centerInParent="true"
android:src="#drawable/orange_centre"
android:transitionName="selectedIcon"
android:layout_height="100dp" />
</RelativeLayout>
first_fragment.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<ImageView
android:id="#+id/img1"
android:layout_width="100dp"
android:layout_height="100dp"
android:layout_gravity="center"
android:src="#drawable/orange_centre" />
</LinearLayout>
Edit1-
This question is not a duplicate of link mentioned in comment because that question is a sub part of my question. The difference is that the animation in that question happens on a click with a static speed. However in my question, the speed of animation must be equal to the speed of ViewPager swipe speed.
You can try PageTransformer. It is not shared transition but more of view animation that is dependent on page position offset generated by swipe events.
I have a fragment_main.xml inside an activity_main.xml.
The fragment is added inside a Tabbed Activity created from an Android Studio template.
I want to do a change in the Fragment's view from within the Activity. That's why I created an Interface that allows the Fragment to call the Activity during the Fragment's onStart, when I know that the Fragment's view is available for modifications.
I did get this to work if I pass the actual Fragment instance using my interface callback. But I'm still frustrated because I don't understand why this function returns null. Does this have anything to do with reusing fragments in different screen orientations?
I've looked over similar questions here on SO reported with this function returning null. Somebody mentioned that there might be an issue with using import android.support.v4.app.Fragment; as opposed to just android.app.Fragment. I don't think this is my case because getsupportFragmentManager seems to return the correct type of Fragment (v4.app). I have no idea why the v4.app is there, I'm kinda new to all this.
Anyway here's the code, all of it, including imports, because they might be relevant.
package org.axonnsd.musicnexus;
import android.app.Activity;
import android.content.Context;
import android.media.MediaPlayer;
import android.os.Environment;
import android.os.Handler;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
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.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.MediaController;
import android.widget.TextView;
import java.io.FileInputStream;
import java.io.IOException;
public class MainActivity extends AppCompatActivity implements OnFragmentReadyListener {
/**
* The {#link android.support.v4.view.PagerAdapter} that will provide
* fragments for each of the sections. We use a
* {#link FragmentPagerAdapter} derivative, which will keep every
* loaded fragment in memory. If this becomes too memory intensive, it
* may be best to switch to a
* {#link android.support.v4.app.FragmentStatePagerAdapter}.
*/
private SectionsPagerAdapter mSectionsPagerAdapter;
private static final String TAG = "MyTabbedApplication";
private Handler handler = new Handler();
/**
* The {#link ViewPager} that will host the section contents.
*/
private ViewPager mViewPager;
#Override
protected void onStop() {
super.onStop();
mediaController.hide();
mediaPlayer.stop();
mediaPlayer.release();
}
#Override
public boolean onTouchEvent(MotionEvent event) {
//the MediaController will hide after 3 seconds - tap the screen to make it appear again
mediaController.show();
return false;
}
public void onFragmentReady(PlaceholderFragment fragment)
{
this.getIntent().putExtra(AUDIO_FILE_NAME,AUDIO_FILE_NAME);
audioFile = this.getIntent().getStringExtra(AUDIO_FILE_NAME);
PlaceholderFragment fragment = (PlaceholderFragment)(getSupportFragmentManager().findFragmentById(R.id.main_audio_view));
//FRAGMENT IS NULL!
fragment.setNowPlayingText(audioFile);
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
// 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.container);
mViewPager.setAdapter(mSectionsPagerAdapter);
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();
}
});
}
#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);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
/**
* The fragment argument representing the section number for this
* fragment.
*/
private static final String ARG_SECTION_NUMBER = "section_number";
private TextView _txtNowPlaying;
private MainActivity _parentActivity;
public PlaceholderFragment() {
}
/**
* Returns a new instance of this fragment for the given section
* number.
*/
public static PlaceholderFragment newInstance(int sectionNumber) {
PlaceholderFragment fragment = new PlaceholderFragment();
Bundle args = new Bundle();
args.putInt(ARG_SECTION_NUMBER, sectionNumber);
fragment.setArguments(args);
return fragment;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
TextView textView = (TextView) rootView.findViewById(R.id.section_label);
_txtNowPlaying = (TextView)rootView.findViewById(R.id.now_playing_text);
textView.setText(getString(R.string.section_format, getArguments().getInt(ARG_SECTION_NUMBER)));
//notifyActivity(_parentActivity);
return rootView;
}
#Override
public void onAttach(Activity activity)
{
super.onAttach(activity);
_parentActivity = (MainActivity)activity;
}
#Override
public void onAttach(Context context)
{
super.onAttach(context);
if (context instanceof Activity){
_parentActivity = (MainActivity)context;
}
}
#Override
public void onStart()
{
super.onStart();
notifyActivity(_parentActivity);
}
private void notifyActivity(MainActivity activity)
{
activity.onFragmentReady(this);
}
public void setNowPlayingText(String value)
{
_txtNowPlaying.setText(value);
}
}
/**
* 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).
return PlaceholderFragment.newInstance(position + 1);
}
#Override
public int getCount() {
// Show 3 total pages.
return 3;
}
#Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return "SECTION 1";
case 1:
return "SECTION 2";
case 2:
return "SECTION 3";
}
return null;
}
}
}
I'm pasting the XMLs too, even though they are fine (as I said, it works if I pass the actual fragment).
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/main_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context="org.axonnsd.musicnexus.MainActivity">
<android.support.design.widget.AppBarLayout
android:id="#+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingTop="#dimen/appbar_padding_top"
android:theme="#style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:layout_scrollFlags="scroll|enterAlways"
app:popupTheme="#style/AppTheme.PopupOverlay">
</android.support.v7.widget.Toolbar>
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
<android.support.design.widget.FloatingActionButton
android:id="#+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="end|bottom"
android:layout_margin="#dimen/fab_margin"
app:srcCompat="#android:drawable/ic_dialog_email" />
</android.support.design.widget.CoordinatorLayout>
fragment_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:id="#+id/main_audio_view"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context="org.axonnsd.musicnexus.MainActivity$PlaceholderFragment">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="Now playing:"
android:textSize="25sp"
android:textStyle="bold"
/>
<TextView
android:id="#+id/now_playing_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="20dip"
android:layout_marginLeft="10dip"
android:layout_marginRight="10dip"
android:layout_gravity="center"
android:text="Now playing.."
android:textSize="16sp"
android:textStyle="italic"
/>
<TextView
android:id="#+id/section_label"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</RelativeLayout>
First of all, you're using findFragmentById wrong, passing id of root layout of your fragment as a parameter, when it expects an id of a layout that contains your fragment (not layout inside a fragment!)
FragmentPagerAdapter is kinda tricky and getting current fragment is not straightforward. Check this answer:
Getting the current Fragment instance in the viewpager
Replace your:
PlaceholderFragment fragment = (PlaceholderFragment)(getSupportFragmentManager().findFragmentById(R.id.main_audio_view));
//FRAGMENT IS NULL!
with
PlaceholderFragment page = (PlaceholderFragment)
getSupportFragmentManager().findFragmentByTag("android:switcher:" +
R.id.container + ":" + mViewPager.getCurrentItem());
I would try the following, but I'm sure it's not the nicest solution.
I would pass the value of section_number instead of the PlaceholderFragment and get the fragment from the SectionPageAdapter. Something like this:
public void onFragmentReady(int position)
{
this.getIntent().putExtra(AUDIO_FILE_NAME,AUDIO_FILE_NAME);
audioFile = this.getIntent().getStringExtra(AUDIO_FILE_NAME);
PlaceholderFragment fragment = (PlaceholderFragment)mSectionsPagerAdapter.getItem(position);
fragment.setNowPlayingText(audioFile);
}
This question has been asked before, however, I have not found an appropriate answer for my problem. I am building a simple fragment activity that displays three buttons at the top of the screen in one container that when pressed update the fragment in the rest of the screen. Just like a tab host. I am using android.support.v4.app.Fragment in all code, but still cannot get the transaction manager to display the fragment in the container. I've been banging my head on the keyboard for hours and connot find the problem.
Here is the main activity extending FragmentActivity:
package com.example.testudpfragment;
import com.example.testudp.R;
import android.support.v4.app.FragmentActivity;
import android.os.Bundle;
public class TestUDPFragmentActivity extends FragmentActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_test_udpfragment);
if(savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.menu_container, new MenuFragment()).commit();
}
}
}
Here is the MenuFragment class extending fragment for my tabs:
package com.example.testudpfragment;
import com.example.testudp.R;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.support.v4.app.*;
public class MenuFragment extends Fragment{
Fragment frag;
FragmentTransaction fragTransaction;
public MenuFragment() {
}
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.frament_menu, container, false);
frag = new StringsFragment();
fragTransaction = getFragmentManager().beginTransaction().add(R.id.container, frag);
System.out.println(fragTransaction.toString());
fragTransaction.commit();
Button btnString = (Button) view.findViewById(R.id.button_string);
Button btnSlider = (Button) view.findViewById(R.id.button_slider);
Button btnTouch = (Button) view.findViewById(R.id.button_touch);
btnString.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
frag = new StringsFragment();
fragTransaction = getFragmentManager().beginTransaction().replace(R.id.container, frag);
fragTransaction.commit();
}
});
btnSlider.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
frag = new SlidersFragment();
fragTransaction = getFragmentManager().beginTransaction().replace(R.id.container, frag);
fragTransaction.commit();
}
});
btnTouch.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
frag = new TouchFragment();
fragTransaction = getFragmentManager().beginTransaction().replace(R.id.container, frag);
fragTransaction.commit();
}
});
return view;
}
}
Here is one of the three fragments that I can't get to display:
package com.example.testudpfragment;
import com.example.testudp.R;
import android.support.v4.app.*;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class StringsFragment extends Fragment {
public StringsFragment() {
}
public View onCreatView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_strings, null);
return rootView;
}
}
activity_test_udpfragment:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<FrameLayout
android:id="#+id/menu_container"
android:background="#eee"
android:layout_width="match_parent"
android:layout_height="wrap_content">
</FrameLayout>
<FrameLayout
android:id="#+id/container"
android:background="#aaa"
android:layout_width="match_parent"
android:layout_height="match_parent">
</FrameLayout>
</LinearLayout>
Here is frament_menu:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
style="android.att/buttonBarStyle" >``
<Button
android:id="#+id/button_string"
style="android.att/buttonBarButtonStyle"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="String" />
<Button
android:id="#+id/button_slider"
style="android.att/buttonBarButtonStyle"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Slider" />
<Button
android:id="#+id/button_touch"
style="android.att/buttonBarButtonStyle"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Touch" />
</LinearLayout>
And here is fragment_strings:
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="#+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:scaleType = "centerCrop"
android:src="#drawable/me_hooded" />
</RelativeLayout>
Any help is greatly appreciated!
EDIT:
Here is new TestUDPActivityFragment with buttons to change fragment:
package com.example.testudpfragment;
import com.example.testudp.R;
import android.support.v4.app.*;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.os.Bundle;
public class TestUDPFragmentActivity extends FragmentActivity {
Fragment frag;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_test_udpfragment);
Button btnString = (Button)findViewById(R.id.btn_string);
Button btnSlider = (Button)findViewById(R.id.btn_slider);
Button btnTouch = (Button)findViewById(R.id.btn_touch);
if(savedInstanceState == null) {
getSupportFragmentManager().beginTransaction().add(R.id.container, new StringsFragment()).commit();
btnString.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View arg0) {
frag = new StringsFragment();
getSupportFragmentManager().beginTransaction().replace(R.id.container, frag).commit();
}
});
btnSlider.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View arg0) {
frag = new SlidersFragment();
getSupportFragmentManager().beginTransaction().replace(R.id.container, frag).commit();
}
});
btnTouch.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View arg0) {
frag = new TouchFragment();
getSupportFragmentManager().beginTransaction().replace(R.id.container, frag).commit();
}
});
}
}
}
I can see a couple of problems...
First, your FrameLayout containers are defined in your activity_test_udpfragment.xml layout file which is inflated by your TestUDPFragmentActivity. The problem with attempting to create / add your StringsFragment in your MenuFragment code using the following...
fragTransaction = getFragmentManager().beginTransaction().add(R.id.container, frag);
...is the MenuFragment inflates a layout from your frament_menu.xml which doesn't contain a FrameLayout with id of R.id.container.
That's your first problem but the second is with attempting to use a Fragment to create / add a Fragment in the first place. Your MenuFragment is not able to use the Framelayout in the TestUDPFragmentActivity.
In short, I suspect you want both Fragments to appear in your Activity layout (and not have the StringsFragment as a 'child' of MenuFragment) in which case you need to put all code for creating / adding both Fragments into your Activity.
I'm new to android and java. this is my first app. an example of a book. I did all steps according the book. the app is going to increase the number by click on + button
this is my Java file :
package com.example.myprayercounter;
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.widget.Button;
import android.widget.TextView;
import android.os.Build;
public class MainActivity extends ActionBarActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//
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.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);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
int counter;
TextView tView;
Button btn;
public PlaceholderFragment() {}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
counter = 0;
tView = (TextView)getActivity().findViewById(R.id.txt_textTwo);
btn = (Button)getActivity().findViewById(R.id.btn_buttonOne);
btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
counter++;
tView.setText(" " + counter);
}
});
return rootView;
}
}
}
xml file :
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/LinearLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#fbfbdd"
android:gravity="center_horizontal"
android:orientation="vertical"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context="com.example.myprayercounter.MainActivity$PlaceholderFragment" >
<TextView
android:id="#+id/txt_textOne"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="تعداد ذکرهای من"
android:textColor="#763f05"
android:textSize="20dp" />
<TextView
android:id="#+id/txt_textTwo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="0"
android:textColor="#763f05"
android:textSize="40dp" />
<Button
android:id="#+id/btn_buttonOne"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#763f05"
android:text="+"
android:textColor="#fbfbdd"
android:textSize="40dp" />
</LinearLayout>
I got this error at first run of the app :
What is my mistakes? and how i can fix them?
Thanks in advance
change:
tView = (TextView)getActivity().findViewById(R.id.txt_textTwo);
btn = (Button)getActivity().findViewById(R.id.btn_buttonOne);
to ( getActivity() --> rootView)
tView = (TextView)rootView.findViewById(R.id.txt_textTwo);
btn = (Button)rootView.findViewById(R.id.btn_buttonOne);
in PlaceholderFragment, your View is rootView and you need find your view from that
UPDATED ItemEntryFragment.java and ToDoActivity.java to include my latest attempt to get this thing to work, but it doesn't
I am in an android development class. our assignment is to make a simple todo list using two fragments. The first fragment is an EditText and the second is a listView.
when a user enters an item into the edittext box and hits enter, the string is added to the listview.
update 2 The application now successfully loads on my phone and the fragments look as expected. however when I press the enter key after inputting text in the EditText line, the setOnKeyListener is never fired. The code segments are the most current.
any suggestions/pointers would be appreciated.
Below are my xml files that I think are correct
main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<fragment
android:name="com.todo.ToDoListFragment"
android:id="#+id/todolistFragment"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<fragment
android:name="com.todo.ItemEntryFragment"
android:id="#+id/textboxFragment"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
_
list_view_fragment.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<EditText
android:id="#+id/myEditText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:contentDescription="#string/addItemContentDescription"
android:hint="#string/addItemHint" />
</LinearLayout>
_
edit_text_fragment.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
</LinearLayout>
and here are my .java files
import android.app.Activity;
import android.app.Fragment;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.EditText;
public class ItemEntryFragment extends Fragment{
private ToDoListActivity activity;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.text_entry_box, container, false);
final EditText myEditText = (EditText)view.findViewById(R.id.myEditText);
myEditText.setOnKeyListener(new View.OnKeyListener() {
#Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
if (event.getAction() == KeyEvent.ACTION_DOWN)
if((keyCode == KeyEvent.KEYCODE_DPAD_CENTER) || (keyCode == KeyEvent.KEYCODE_ENTER)) {
String newItem = myEditText.getText().toString();
activity.addItem(newItem);
myEditText.setText("");
return true;
}
return false;
}
});
return view;
}
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
this.activity = (ToDoListActivity)activity;
}
}
_
public class ToDoListFragment extends ListFragment {
//this class is empty because the ListFragment auto adds the ListView
}
and here is my main java file
import java.util.ArrayList;
import android.app.Activity;
import android.app.FragmentManager;
import android.os.Bundle;
import android.widget.ArrayAdapter;
public class ToDoListActivity extends Activity {
private ArrayAdapter<String> aa;
private ArrayList<String> todoItems;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//inflate view
setContentView(R.layout.activity_to_do_list);
//get references to fragments
FragmentManager fm = getFragmentManager();
ToDoListFragment todoListFragment = (ToDoListFragment) fm.findFragmentById(R.id.todolistFragment);
todoItems = new ArrayList<String>();
//create array adaptor to bind array to list view
aa = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, todoItems);
//bind array adapter to list view
todoListFragment.setListAdapter(aa);
}
public void addItem(String newItem){
todoItems.add(newItem);
aa.notifyDataSetChanged();
}
}
Maybe try to hook into onEditorAction and set the EditText properties as mentioned here