Develop Reference

Placing "Native Advanced Ads" inside popup close

I try to put advanced ads inside the dialog box when you close the application, but when you open a dialog box does not load the ad for the first time. ... I am worried that I load the ad inside the application
without appearing and at closing I put it in the dialog box for fear that the agent considers it a google violation to download the ad without its appearance
Constant code from android developer
public class MainActivity extends AppCompatActivity {
private static final String ADMOB_AD_UNIT_ID = "ca-app-pub-3940256099942544/2247696110";
private static final String ADMOB_APP_ID = "ca-app-pub-3940256099942544~3347511713";
AdLoader.Builder builder;
UnifiedNativeAdView adView;
private Button refresh;
private CheckBox startVideoAdsMuted;
private TextView videoStatus;
private UnifiedNativeAd nativeAd;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Initialize the Mobile Ads SDK.
MobileAds.initialize(this, ADMOB_APP_ID);
refresh = findViewById(R.id.btn_refresh);
startVideoAdsMuted = findViewById(R.id.cb_start_muted);
videoStatus = findViewById(R.id.tv_video_status);
refresh.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View unusedView) {
refreshAd();
}
});
refreshAd();
}
/**
* Populates a {#link UnifiedNativeAdView} object with data from a given
* {#link UnifiedNativeAd}.
*
* #param nativeAd the object containing the ad's assets
* #param adView the view to be populated
*/
private void populateUnifiedNativeAdView(UnifiedNativeAd nativeAd, UnifiedNativeAdView adView) {
// Set the media view. Media content will be automatically populated in the media view once
// adView.setNativeAd() is called.
MediaView mediaView = adView.findViewById(R.id.ad_media);
adView.setMediaView(mediaView);
// Set other ad assets.
adView.setHeadlineView(adView.findViewById(R.id.ad_headline));
adView.setBodyView(adView.findViewById(R.id.ad_body));
adView.setCallToActionView(adView.findViewById(R.id.ad_call_to_action));
adView.setIconView(adView.findViewById(R.id.ad_app_icon));
adView.setPriceView(adView.findViewById(R.id.ad_price));
adView.setStarRatingView(adView.findViewById(R.id.ad_stars));
adView.setStoreView(adView.findViewById(R.id.ad_store));
adView.setAdvertiserView(adView.findViewById(R.id.ad_advertiser));
// The headline is guaranteed to be in every UnifiedNativeAd.
((TextView) adView.getHeadlineView()).setText(nativeAd.getHeadline());
// These assets aren't guaranteed to be in every UnifiedNativeAd, so it's important to
// check before trying to display them.
if (nativeAd.getBody() == null) {
adView.getBodyView().setVisibility(View.INVISIBLE);
} else {
adView.getBodyView().setVisibility(View.VISIBLE);
((TextView) adView.getBodyView()).setText(nativeAd.getBody());
}
if (nativeAd.getCallToAction() == null) {
adView.getCallToActionView().setVisibility(View.INVISIBLE);
} else {
adView.getCallToActionView().setVisibility(View.VISIBLE);
((Button) adView.getCallToActionView()).setText(nativeAd.getCallToAction());
}
if (nativeAd.getIcon() == null) {
adView.getIconView().setVisibility(View.GONE);
} else {
((ImageView) adView.getIconView()).setImageDrawable(
nativeAd.getIcon().getDrawable());
adView.getIconView().setVisibility(View.VISIBLE);
}
if (nativeAd.getPrice() == null) {
adView.getPriceView().setVisibility(View.INVISIBLE);
} else {
adView.getPriceView().setVisibility(View.VISIBLE);
((TextView) adView.getPriceView()).setText(nativeAd.getPrice());
}
if (nativeAd.getStore() == null) {
adView.getStoreView().setVisibility(View.INVISIBLE);
} else {
adView.getStoreView().setVisibility(View.VISIBLE);
((TextView) adView.getStoreView()).setText(nativeAd.getStore());
}
if (nativeAd.getStarRating() == null) {
adView.getStarRatingView().setVisibility(View.INVISIBLE);
} else {
((RatingBar) adView.getStarRatingView())
.setRating(nativeAd.getStarRating().floatValue());
adView.getStarRatingView().setVisibility(View.VISIBLE);
}
if (nativeAd.getAdvertiser() == null) {
adView.getAdvertiserView().setVisibility(View.INVISIBLE);
} else {
((TextView) adView.getAdvertiserView()).setText(nativeAd.getAdvertiser());
adView.getAdvertiserView().setVisibility(View.VISIBLE);
}
// This method tells the Google Mobile Ads SDK that you have finished populating your
// native ad view with this native ad. The SDK will populate the adView's MediaView
// with the media content from this native ad.
adView.setNativeAd(nativeAd);
// Get the video controller for the ad. One will always be provided, even if the ad doesn't
// have a video asset.
VideoController vc = nativeAd.getVideoController();
// Updates the UI to say whether or not this ad has a video asset.
if (vc.hasVideoContent()) {
videoStatus.setText(String.format(Locale.getDefault(),
"Video status: Ad contains a %.2f:1 video asset.",
vc.getAspectRatio()));
// Create a new VideoLifecycleCallbacks object and pass it to the VideoController. The
// VideoController will call methods on this object when events occur in the video
// lifecycle.
vc.setVideoLifecycleCallbacks(new VideoController.VideoLifecycleCallbacks() {
#Override
public void onVideoEnd() {
// Publishers should allow native ads to complete video playback before
// refreshing or replacing them with another ad in the same UI location.
refresh.setEnabled(true);
videoStatus.setText("Video status: Video playback has ended.");
super.onVideoEnd();
}
});
} else {
videoStatus.setText("Video status: Ad does not contain a video asset.");
refresh.setEnabled(true);
}
}
/**
* Creates a request for a new native ad based on the boolean parameters and calls the
* corresponding "populate" method when one is successfully returned.
*
*/
private void refreshAd() {
refresh.setEnabled(false);
builder = new AdLoader.Builder(this, ADMOB_AD_UNIT_ID);
builder.forUnifiedNativeAd(new UnifiedNativeAd.OnUnifiedNativeAdLoadedListener() {
// OnUnifiedNativeAdLoadedListener implementation.
#Override
public void onUnifiedNativeAdLoaded(UnifiedNativeAd unifiedNativeAd) {
// You must call destroy on old ads when you are done with them,
// otherwise you will have a memory leak.
if (nativeAd != null) {
nativeAd.destroy();
}
nativeAd = unifiedNativeAd;
FrameLayout frameLayout =
findViewById(R.id.fl_adplaceholder);
adView = (UnifiedNativeAdView) getLayoutInflater()
.inflate(R.layout.ad_unified, null);
populateUnifiedNativeAdView(unifiedNativeAd, adView);
frameLayout.removeAllViews();
frameLayout.addView(adView);
}
});
VideoOptions videoOptions = new VideoOptions.Builder()
.setStartMuted(startVideoAdsMuted.isChecked())
.build();
NativeAdOptions adOptions = new NativeAdOptions.Builder()
.setVideoOptions(videoOptions)
.build();
builder.withNativeAdOptions(adOptions);
AdLoader adLoader = builder.withAdListener(new AdListener() {
#Override
public void onAdFailedToLoad(int errorCode) {
refresh.setEnabled(true);
Toast.makeText(MainActivity.this, "Failed to load native ad: "
+ errorCode, Toast.LENGTH_SHORT).show();
}
}).build();
adLoader.loadAd(new AdRequest.Builder().build());
videoStatus.setText("");
}
Now I'm trying to put the code refresh method insaid dialog box instead of refresh method
public void showdilog(){
builder = new AdLoader.Builder(this, ADMOB_AD_UNIT_ID);
builder.forUnifiedNativeAd(new UnifiedNativeAd.OnUnifiedNativeAdLoadedListener() {
// OnUnifiedNativeAdLoadedListener implementation.
#Override
public void onUnifiedNativeAdLoaded(UnifiedNativeAd unifiedNativeAd) {
// You must call destroy on old ads when you are done with them,
// otherwise you will have a memory leak.
if (nativeAd != null) {
nativeAd.destroy();
}
nativeAd = unifiedNativeAd;
FrameLayout frameLayout =
findViewById(R.id.fl_adplaceholder);
adView = (UnifiedNativeAdView) getLayoutInflater()
.inflate(R.layout.ad_unified, null);
populateUnifiedNativeAdView(unifiedNativeAd, adView);
frameLayout.removeAllViews();
frameLayout.addView(adView);
}
});
VideoOptions videoOptions = new VideoOptions.Builder()
.setStartMuted(startVideoAdsMuted.isChecked())
.build();
NativeAdOptions adOptions = new NativeAdOptions.Builder()
.setVideoOptions(videoOptions)
.build();
builder.withNativeAdOptions(adOptions);
AdLoader adLoader = builder.withAdListener(new AdListener() {
#Override
public void onAdFailedToLoad(int errorCode) {
refresh.setEnabled(true);
Toast.makeText(MainActivity.this, "Failed to load native ad: "
+ errorCode, Toast.LENGTH_SHORT).show();
}
}).build();
adLoader.loadAd(new AdRequest.Builder().build());
AlertDialog.Builder builder = new AlertDialog.Builder(this);
bulider.setView(adView);
builder.setMessage(R.string.onfirm_exit)
.setCancelable(false)
.setPositiveButton(R.string.yes, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
finish();
}
})
.setNegativeButton(R.string.no, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}
});
AlertDialog alert = builder.create();
alert.show();
}

What you're doing is that you're building and showing your dialog box at the same time. So, at the time you show your dialog box you're also loading your native ad.
You should BUILD your dialog box in advance, and don't call alert.show() in your build function.
So, call your buildDialog() in MainActivity in advance.
In your onBackPressed function call alert.show().
Hope it helps.

Text Size Change in Adapter class updates text size in all activities

The following is my WordAdapter class
public class WordAdapter extends ArrayAdapter<Word> {
/** Resource ID for the background color for this list of words */
private int mColorResourceId;
/**
* Create a new {#link WordAdapter} object.
*
* #param context is the current context (i.e. Activity) that the adapter is being created in.
* #param words is the list of {#link Word}s to be displayed.
* #param colorResourceId is the resource ID for the background color for this list of words
*/
public WordAdapter(Context context, ArrayList<Word> words, int colorResourceId) {
super(context, 0, words);
mColorResourceId = colorResourceId;
}
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
// Check if an existing view is being reused, otherwise inflate the view
View listItemView = convertView;
if (listItemView == null) {
listItemView = LayoutInflater.from(getContext()).inflate(
R.layout.list_item, parent, false);
}
// Get the {#link Word} object located at this position in the list
final Word currentWord = getItem(position);
// Find the TextView in the list_item.xml layout with the ID miwok_text_view.
TextView miwokTextView = (TextView) listItemView.findViewById(R.id.miwok_text_view);
// Get the Miwok translation from the currentWord object and set this text on
// the Miwok TextView.
miwokTextView.setText(currentWord.getMiwokTranslationId());
// Find the TextView in the list_item.xml layout with the ID default_text_view.
TextView defaultTextView = (TextView) listItemView.findViewById(R.id.default_text_view);
// Get the default translation from the currentWord object and set this text on
// the default TextView.
defaultTextView.setText(currentWord.getDefaultTranslationId());
TextView onClickTextView = (TextView) listItemView.findViewById(R.id.miwok_text_view_on_click);
onClickTextView.setText((currentWord.getTextOnClickId()));
final ImageView playIcon = (ImageView) listItemView.findViewById(R.id.play_icon);
final ImageView playIconPlaying = (ImageView) listItemView.findViewById(R.id.play_icon_playing);
// Find the ImageView in the list_item.xml layout with the ID image.
final ImageView imageView = (ImageView) listItemView.findViewById(R.id.image);
// Check if an image is provided for this word or not
if (currentWord.hasImage()) {
// If an image is available, display the provided image based on the resource ID
imageView.setImageResource(currentWord.getImageResourceId());
// Make sure the view is visible
imageView.setVisibility(View.VISIBLE);
} else {
// Otherwise hide the ImageView (set visibility to GONE)
imageView.setVisibility(View.GONE);
}
if (Activity1.isActive == true){
onClickTextView.setTextSize(55);
} else {
onClickTextView.setTextSize(35);
}
if (Activity3.isActive == true){
onClickTextView.setTextSize(55);
} else {
onClickTextView.setTextSize(35);
}
// add a tag to determine the position of the view, when the view is clicked.
imageView.setTag(position);
// Set the theme color for the list item
View textContainer = listItemView.findViewById(R.id.text_container);
// Find the color that the resource ID maps to
int color = ContextCompat.getColor(getContext(), mColorResourceId);
// Set the background color of the text container View
textContainer.setBackgroundColor(color);
// Return the whole list item layout (containing 2 TextViews) so that it can be shown in
// the ListView.
// ImageView imageView = (ImageView) listItemView.findViewById(R.id.list_item);
imageView.setOnClickListener(new ImageView.OnClickListener() {
#Override
public void onClick(View view) {
if(currentWord.isFlag){
currentWord.isFlag = false;
Word.flaggedPosition = -1;
}else{
if (Word.flaggedPosition >=0) {
Word.adapter.getItem(Word.flaggedPosition).isFlag = false;
}
currentWord.isFlag = true;
Word.flaggedPosition = position;
}
notifyDataSetChanged();
}
});
if(currentWord.isFlag)
{
imageView.setAlpha(60);
onClickTextView.setVisibility(View.VISIBLE);
}
else
{
imageView.setAlpha(255);
onClickTextView.setVisibility(View.INVISIBLE);
}
return listItemView;
}
}
its the onClickTextView TextView is which i wish to change in Activities...
the activity2 has no change in the textView size which is 35sp
the following is my VarnamalaFragment class
public class VarnamalaFragment extends Fragment {
/** to check whether Acitivity is Active */
static boolean isActive = true;
/** Stores the last selected position */
private int lastSelectedPosition = -1;
/** Handles playback of all the sound files */
private MediaPlayer mMediaPlayer;
/** Handles audio focus when playing a sound file */
private AudioManager mAudioManager;
// Create a list of words
private ArrayList<Word> words = new ArrayList<Word>();
/**
* This listener gets triggered whenever the audio focus changes
* (i.e., we gain or lose audio focus because of another app or device).
*/
private AudioManager.OnAudioFocusChangeListener mOnAudioFocusChangeListener = new AudioManager.OnAudioFocusChangeListener() {
#Override
public void onAudioFocusChange(int focusChange) {
if (focusChange == AudioManager.AUDIOFOCUS_LOSS_TRANSIENT ||
focusChange == AudioManager.AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK) {
// The AUDIOFOCUS_LOSS_TRANSIENT case means that we've lost audio focus for a
// short amount of time. The AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK case means that
// our app is allowed to continue playing sound but at a lower volume. We'll treat
// both cases the same way because our app is playing short sound files.
// Pause playback and reset player to the start of the file. That way, we can
// play the word from the beginning when we resume playback.
mMediaPlayer.pause();
mMediaPlayer.seekTo(0);
} else if (focusChange == AudioManager.AUDIOFOCUS_GAIN) {
// The AUDIOFOCUS_GAIN case means we have regained focus and can resume playback.
mMediaPlayer.start();
} else if (focusChange == AudioManager.AUDIOFOCUS_LOSS) {
// The AUDIOFOCUS_LOSS case means we've lost audio focus and
// Stop playback and clean up resources
releaseMediaPlayer();
}
}
};
/**
* This listener gets triggered when the {#link MediaPlayer} has completed
* playing the audio file.
*/
private MediaPlayer.OnCompletionListener mCompletionListener = new MediaPlayer.OnCompletionListener() {
#Override
public void onCompletion(MediaPlayer mediaPlayer) {
// Now that the sound file has finished playing, release the media player resources.
if(lastSelectedPosition != -1){
Word lastWord = words.get(lastSelectedPosition);
lastWord.isPlaying = false;
lastSelectedPosition = -1;
Word.adapter.notifyDataSetChanged();
}
releaseMediaPlayer();
}
};
public VarnamalaFragment() {
// Required empty public constructor
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.word_list, container, false);
// Create and setup the {#link AudioManager} to request audio focus
mAudioManager = (AudioManager) getActivity().getSystemService(Context.AUDIO_SERVICE);
words.add(new Word(R.string.letter_a, R.string.miwok_letter_a,
R.drawable.a_se_anaar,R.string.miwok_letter_a_only, R.raw.a_se_anaar_audio));
words.add(new Word(R.string.letter_aa, R.string.miwok_letter_Aa,
R.drawable.aa_se_aam, R.string.miwok_letter_Aa_only, R.raw.aa_se_aam_audio));
words.add(new Word(R.string.letter_e, R.string.miwok_letter_E,
R.drawable.e_se_emli,R.string.miwok_letter_E_only, R.raw.e_se_emli_audio));
// Create an {#link WordAdapter}, whose data source is a list of {#link Word}s. The
// adapter knows how to create list items for each item in the list.
Word.adapter = new WordAdapter(getActivity(), words, R.color.category_varnamala_vowels);
// Find the {#link ListView} object in the view hierarchy of the {#link Activity}.
// There should be a {#link ListView} with the view ID called list, which is declared in the
// word_list.xml layout file.
ListView listView = (ListView) rootView.findViewById(R.id.list);
// Make the {#link ListView} use the {#link WordAdapter} we created above, so that the
// {#link ListView} will display list items for each {#link Word} in the list.
listView.setAdapter(Word.adapter);
// Set a click listener to play the audio when the list item is clicked on
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> adapterView, View view, int position, long l) {
// Release the media player if it currently exists because we are about to
// play a different sound file
releaseMediaPlayer();
// Get the {#link Word} object at the given position the user clicked on
Word word = words.get(position);
word.isPlaying = true;
if(lastSelectedPosition != -1){
Word lastWord = words.get(lastSelectedPosition);
lastWord.isPlaying = false;
}
lastSelectedPosition = position;
Word.adapter.notifyDataSetChanged();
// Request audio focus so in order to play the audio file. The app needs to play a
// short audio file, so we will request audio focus with a short amount of time
// with AUDIOFOCUS_GAIN_TRANSIENT.
int result = mAudioManager.requestAudioFocus(mOnAudioFocusChangeListener,
AudioManager.STREAM_MUSIC, AudioManager.AUDIOFOCUS_GAIN_TRANSIENT);
if (result == AudioManager.AUDIOFOCUS_REQUEST_GRANTED) {
// We have audio focus now.
// Create and setup the {#link MediaPlayer} for the audio resource associated
// with the current word
mMediaPlayer = MediaPlayer.create(getActivity(), word.getAudioResourceId());
// Start the audio file
mMediaPlayer.start();
word.isPlaying = true;
Word.adapter.notifyDataSetChanged();
// Get the value of currentVolume
int currentVolume = mAudioManager.getStreamVolume(AudioManager.STREAM_MUSIC);
// If currentVolume is set to 0, show Toast
if (currentVolume ==0){
Toast.makeText(getContext(), "Please Turn the Volume Up ", Toast.LENGTH_SHORT).show();
}
// Setup a listener on the media player, so that we can stop and release the
// media player once the sound has finished playing.
mMediaPlayer.setOnCompletionListener(mCompletionListener);
}
}
});
return rootView;
}
#Override
public void onStart() {
super.onStart();
isActive = true;
}
#Override
public void onStop() {
super.onStop();
isActive = false;
// When the activity is stopped, release the media player resources because we won't
// be playing any more sounds.
releaseMediaPlayer();
}
/**
* Clean up the media player by releasing its resources.
*/
private void releaseMediaPlayer() {
// If the media player is not null, then it may be currently playing a sound.
if (mMediaPlayer != null) {
// Regardless of the current state of the media player, release its resources
// because we no longer need it.
mMediaPlayer.release();
// Set the media player back to null. For our code, we've decided that
// setting the media player to null is an easy way to tell that the media player
// is not configured to play an audio file at the moment.
mMediaPlayer = null;
// Regardless of whether or not we were granted audio focus, abandon it. This also
// unregisters the AudioFocusChangeListener so we don't get anymore callbacks.
mAudioManager.abandonAudioFocus(mOnAudioFocusChangeListener);
}
}
}
The problem i face is the app changes the text size to 55sp in all the activities including activity2 for which i have no IF..ELSE block...
How do i change the textSize to 55sp in activity1 and activity3 in my Adapter class
I have logged and checked the logcat for correct updation of the isActive value to true and false when the activity1 and activity3 is active and not active....

In your Case, You can check using class name. Like,
context.getClass().getSimpleName()
which return value "Activity1" .
updated class >>
public class WordAdapter extends ArrayAdapter<Word> {
private int mColorResourceId;
private Context mContext;
public WordAdapter(Context context, ArrayList<Word> words, int colorResourceId) {
super(context, 0, words);
mColorResourceId = colorResourceId;
mContext = context;
}
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
View listItemView = convertView;
if (listItemView == null) {
listItemView = LayoutInflater.from(getContext()).inflate(
R.layout.list_item, parent, false);
}
final Word currentWord = getItem(position);
TextView miwokTextView = (TextView) listItemView.findViewById(R.id.miwok_text_view);
miwokTextView.setText(currentWord.getMiwokTranslationId());
TextView defaultTextView = (TextView) listItemView.findViewById(R.id.default_text_view);
defaultTextView.setText(currentWord.getDefaultTranslationId());
TextView onClickTextView = (TextView) listItemView.findViewById(R.id.miwok_text_view_on_click);
onClickTextView.setText((currentWord.getTextOnClickId()));
final ImageView playIcon = (ImageView) listItemView.findViewById(R.id.play_icon);
final ImageView playIconPlaying = (ImageView) listItemView.findViewById(R.id.play_icon_playing);
final ImageView imageView = (ImageView) listItemView.findViewById(R.id.image);
if (currentWord.hasImage()) {
imageView.setImageResource(currentWord.getImageResourceId());
imageView.setVisibility(View.VISIBLE);
} else {
imageView.setVisibility(View.GONE);
}
if (mContext.getClass().getSimpleName().equalsIgnoreCase("Activity1") || mContext.getClass().getSimpleName().equalsIgnoreCase("Activity3")) {
onClickTextView.setTextSize(55);
} else {
onClickTextView.setTextSize(35);
}
imageView.setTag(position);
View textContainer = listItemView.findViewById(R.id.text_container);
int color = ContextCompat.getColor(getContext(), mColorResourceId);
textContainer.setBackgroundColor(color);
imageView.setOnClickListener(new ImageView.OnClickListener() {
#Override
public void onClick(View view) {
if (currentWord.isFlag) {
currentWord.isFlag = false;
Word.flaggedPosition = -1;
} else {
if (Word.flaggedPosition >= 0) {
Word.adapter.getItem(Word.flaggedPosition).isFlag = false;
}
currentWord.isFlag = true;
Word.flaggedPosition = position;
}
notifyDataSetChanged();
}
});
if (currentWord.isFlag) {
imageView.setAlpha(60);
onClickTextView.setVisibility(View.VISIBLE);
} else {
imageView.setAlpha(255);
onClickTextView.setVisibility(View.INVISIBLE);
}
return listItemView;
}
}

Shared Element Transition is not exiting properly

I have fragment from which I'm launching activity with shared element transition that has viewpager in it, the enter transition works fine but when i scroll in view pager and finish transition the shared image comes from left side which is not desired it should reposition itself to where it was launched, here is my code:
Intent myIntent = new Intent(getActivity(), EnlargeActivity.class);
ActivityOptionsCompat options = ActivityOptionsCompat.
makeSceneTransitionAnimation(getActivity(),
imageView,
ViewCompat.getTransitionName(imageView));
startActivity(myIntent, options.toBundle());
I'm updating view and its name in activity that contains viewpager when finishing activity, but its going with blink:
public void finishAfterTransition() {
setEnterSharedElementCallback(new SharedElementCallback() {
#Override
public void onMapSharedElements(List<String> names, Map<String, View> sharedElements) {
// Clear all current shared views and names
names.clear();
sharedElements.clear();
ViewGroup viewGroup = (ViewGroup) viewPagerDetail.getAdapter()
.instantiateItem(viewPagerDetail, viewPagerDetail.getCurrentItem());
if (viewGroup == null) {
return;
}
// Map the first shared element name to the child ImageView.
sharedElements.put(viewGroup.findViewById(R.id.img).getTransitionName(), viewGroup.findViewById(R.id.img));
// setExitSharedElementCallback((SharedElementCallback) this);
}
});
super.finishAfterTransition();

Basically, Android start the transition with your pre-defined View and transitionName and automatically use the same properties for the return transition. When you change your focused View in ViewPager, Android doesn't know about that and keep the transition on the previous one on its way back. So you need to inform Android about the changes:
Remap the transition properties: Use setEnterSharedElementCallback to change the transitionName and View to the new one before returning from Activity2.
Wait for the Activity1 to finish rendering addOnPreDrawListener.
It's a bit complex in the final implementation. But you can look at my sample code https://github.com/tamhuynhit/PhotoGallery. I try to implement the shared-element-transition from many simple to complex sections.
Your problem appeared from Level 3 and solved in Level 4.
I am writing a tutorial about this but it's not in English so hope the code can help
UPDATE 1: Work flow
Here is how I implement it in my code:
Override finishAfterTransition in Activity2 and call setEnterSharedElementCallback method to re-map the current selected item in ViewPager. Also, call setResult to pass the new selected index back to previous activity here.
#Override
#TargetApi(Build.VERSION_CODES.LOLLIPOP)
public void finishAfterTransition() {
setEnterSharedElementCallback(new SharedElementCallback() {
#Override
public void onMapSharedElements(List<String> names, Map<String, View> sharedElements) {
View selectedView = getSelectedView();
if (selectedView == null)
return;
// Clear all current shared views and names
names.clear();
sharedElements.clear();
// Store new selected view and name
String transitionName = ViewCompat.getTransitionName(selectedView);
names.add(transitionName);
sharedElements.put(transitionName, selectedView);
setExitSharedElementCallback((SharedElementCallback) null);
}
});
Intent intent = new Intent();
intent.putExtra(PHOTO_FOCUSED_INDEX, mCurrentIndex);
setResult(RESULT_PHOTO_CLOSED, intent);
super.finishAfterTransition();
}
Write a custom ShareElementCallback so I can set the callback before knowing which View is going to be used.
#TargetApi(Build.VERSION_CODES.LOLLIPOP)
private static class CustomSharedElementCallback extends SharedElementCallback {
private View mView;
/**
* Set the transtion View to the callback, this should be called before starting the transition so the View is not null
*/
public void setView(View view) {
mView = view;
}
#Override
public void onMapSharedElements(List<String> names, Map<String, View> sharedElements) {
// Clear all current shared views and names
names.clear();
sharedElements.clear();
// Store new selected view and name
String transitionName = ViewCompat.getTransitionName(mView);
names.add(transitionName);
sharedElements.put(transitionName, mView);
}
}
Override onActivityReenter in Activity1, get the selected index from the result Intent. Set setExitSharedElementCallback to re-map new selected View when the transition begins.Call supportPostponeEnterTransition to delay a bit because your new View may not be rendered at this point. Use getViewTreeObserver().addOnPreDrawListener to listen for the layout changes, find the right View by the selected index and continue the transition supportStartPostponedEnterTransition.
#Override
#TargetApi(Build.VERSION_CODES.LOLLIPOP)
public void onActivityReenter(int resultCode, Intent data) {
if (resultCode != LevelFourFullPhotoActivity.RESULT_PHOTO_CLOSED || data == null)
return;
final int selectedIndex = data.getIntExtra(LevelFourFullPhotoActivity.PHOTO_FOCUSED_INDEX, -1);
if (selectedIndex == -1)
return;
// Scroll to the new selected view in case it's not currently visible on the screen
mPhotoList.scrollToPosition(selectedIndex);
final CustomSharedElementCallback callback = new CustomSharedElementCallback();
getActivity().setExitSharedElementCallback(callback);
// Listen for the transition end and clear all registered callback
getActivity().getWindow().getSharedElementExitTransition().addListener(new Transition.TransitionListener() {
#Override
public void onTransitionStart(Transition transition) {}
#Override
public void onTransitionPause(Transition transition) {}
#Override
public void onTransitionResume(Transition transition) {}
#Override
public void onTransitionEnd(Transition transition) {
removeCallback();
}
#Override
public void onTransitionCancel(Transition transition) {
removeCallback();
}
private void removeCallback() {
if (getActivity() != null) {
getActivity().getWindow().getSharedElementExitTransition().removeListener(this);
getActivity().setExitSharedElementCallback((SharedElementCallback) null);
}
}
});
// Pause transition until the selected view is fully drawn
getActivity().supportPostponeEnterTransition();
// Listen for the RecyclerView pre draw to make sure the selected view is visible,
// and findViewHolderForAdapterPosition will return a non null ViewHolder
mPhotoList.getViewTreeObserver().addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {
#Override
public boolean onPreDraw() {
mPhotoList.getViewTreeObserver().removeOnPreDrawListener(this);
RecyclerView.ViewHolder holder = mPhotoList.findViewHolderForAdapterPosition(selectedIndex);
if (holder instanceof ViewHolder) {
callback.setView(((ViewHolder) holder).mPhotoImg);
}
// Continue the transition
getActivity().supportStartPostponedEnterTransition();
return true;
}
});
}
UPDATE 2: getSelectedItem
To get selected View from the ViewPager, don't use getChildAt or you get the wrong View, use findViewWithTag instead
In the PagerAdapter.instantiateItem, use position as tag for each View:
#Override
public View instantiateItem(ViewGroup container, int position) {
// Create the View
view.setTag(position)
// ...
}
Listen to onPageSelected event to get the selected index:
mViewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
#Override
public void onPageSelected(int position) {
mSelectedIndex = position;
}
#Override
public void onPageScrollStateChanged(int state) {
}
});
Call getSelectedView to get the current view by the selected index
private View getSelectedView() {
try {
return mPhotoViewPager.findViewWithTag(mSelectedIndex);
} catch (IndexOutOfBoundsException | NullPointerException ex) {
return null;
}
}

This is actually a default behavior, I was struggling SharedElementTransitions a lot, but I have nested fragments. I got my solution from an article (very recent article), it shows an implementation with a RecyclerView, which I assume you have. In short, the solution is to override onLayoutChange :
recyclerView.addOnLayoutChangeListener(
new OnLayoutChangeListener() {
#Override
public void onLayoutChange(View view,
int left,
int top,
int right,
int bottom,
int oldLeft,
int oldTop,
int oldRight,
int oldBottom) {
recyclerView.removeOnLayoutChangeListener(this);
final RecyclerView.LayoutManager layoutManager =
recyclerView.getLayoutManager();
View viewAtPosition =
layoutManager.findViewByPosition(MainActivity.currentPosition);
// Scroll to position if the view for the current position is null (not
// currently part of layout manager children), or it's not completely
// visible.
if (viewAtPosition == null
|| layoutManager.isViewPartiallyVisible(viewAtPosition, false, true)){
recyclerView.post(()
-> layoutManager.scrollToPosition(MainActivity.currentPosition));
}
}
});
Here is the article, and you will also find the project on GitHub.

Show BottomSheet after change the layout

I have a BottomSheet "buttomSheet" (in this sheet it is a list view that is GONE) and a normal Button "btnShowListView" (out from the "buttomSheet").
I want that when I click on "btnShowListView" the list view in the bottomSheet will be Visible its work but only after 2 clicks on button "btnShowListView"...
this is my code:
final View bottomSheetView = findViewById(R.id.bottomSheetLayout);
listView = (ListView) bottomSheet.findViewById(R.id.listView);
buttomSheet = BottomSheetBehavior.from(bottomSheetView);
btnShowListView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
listView.setVisibility(View.VISIBLE);
bottomSheetView.requestLayout();
bottomSheetView.invalidate();
bottomSheet.setState(BottomSheetBehavior.STATE_EXPANDED);
}
});

You can make the listview already visible, there's no need to hide it; you can get te same effect by setting the state of the bottom sheet behavior to HIDDEN.
I tested the code below and it should work also for you.
final View bottomSheetView = findViewById(R.id.bottomSheetLayout);
bottomSheetBehavior= BottomSheetBehavior.from(bottomSheetView);
bottomSheetBehavior.setHideable(true);
bottomSheetBehavior.setState(BottomSheetBehavior.STATE_HIDDEN);
btnShowListView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
bottomSheet.setState(BottomSheetBehavior.STATE_EXPANDED);
}
});

How to save Resource ID in click Event android

I have a custom bar (sortBar) with buttons. On click this function is called:
public void setFoodItemSortType(View view)
{
View oldView = view.findViewById(this.currentSortTitleID);
if(oldView != null)
{
oldView.setBackgroundColor(getResources().getColor(R.color.colorPrimary));
}
this.currentSortTitleID = view.getId();
View newView = view.findViewById(this.currentSortTitleID);
newView.setBackgroundColor(getResources().getColor(R.color.colorAccent));
this.LoadData();
}
oldView is always null. Are ids changing in on click cycle? What i am doing wrong?
function is invoked via the onclick attribute:
android:onClick="setFoodItemSortType"

Just change it this way :
View oldView;
public void setFoodItemSortType(View view)
{
if(oldView != null)
{
oldView.setBackgroundColor(getResources().getColor(R.color.colorPrimary));
}
view.setBackgroundColor(getResources().getColor(R.color.colorAccent));
oldView = view
this.LoadData();
}