I have implemented a ViewPager in my application which consist of two slides. I can go from first slide to second slide and reverse as well. But I have a special case here. If the user goes from First Slide to Second Slide. He should not be able to go back to the First slide. I need to disable going back to the First Slide once he enters the Second Slide.
Here is my code:
public class BotConnectionDialog extends DialogFragment {
private RelativeLayout toolbar;
private ImageView toolbarCloseButton;
private View layoutView;
private ViewPager viewPager;
private BotConnectionDialogAdapter myViewPagerAdapter;
private LinearLayout dotsLayout;
private TextView[] dots;
int width, height;
DisplayMetrics metrics;
private int[] layouts;
private final String TAG = BotConnectionDialog.class.getSimpleName();
private Button btnSkip, btnNext;
View.OnClickListener myListener = new View.OnClickListener() {
#Override
public void onClick(View view) {
Handler handler = new Handler();
handler.post(new Runnable() {
#Override
public void run() {
getActivity().getSupportFragmentManager().popBackStackImmediate();
}
});
}
};
#Override
public void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setStyle(DialogFragment.STYLE_NORMAL, android.R.style.Theme_Black_NoTitleBar_Fullscreen);
}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.botconnection_layout, container, false);
Typeface typeface = Typeface.createFromAsset(getActivity().getAssets(), "fonts/corbert.otf");
toolbar = (RelativeLayout) rootView.findViewById(R.id.customAppBarLayout);
toolbar.setBackgroundColor(Color.parseColor("#00000000"));
toolbarCloseButton = (ImageView) rootView.findViewById(R.id.toolbarCloseButton);
toolbarCloseButton.setOnClickListener(myListener);
viewPager = (ViewPager) rootView.findViewById(R.id.view_pager);
dotsLayout = (LinearLayout) rootView.findViewById(R.id.layoutDots);
btnSkip = (Button) rootView.findViewById(R.id.btn_skip);
btnSkip.setTypeface(typeface);
btnNext = (Button) rootView.findViewById(R.id.btn_next);
btnNext.setTypeface(typeface);
metrics = getResources().getDisplayMetrics();
width = metrics.widthPixels;
height = metrics.heightPixels;
// layouts of all welcome sliders
// add few more layouts if you want
layouts = new int[]{
R.layout.slide1,
R.layout.slide2};
// adding bottom dots
addBottomDots(0);
myViewPagerAdapter = new BotConnectionDialogAdapter();
viewPager.setAdapter(myViewPagerAdapter);
viewPager.addOnPageChangeListener(viewPagerPageChangeListener);
btnNext.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// checking for last page
// if last page home screen will be launched
int current = getItem(+1);
if (current < layouts.length) {
// move to next screen
viewPager.setCurrentItem(current);
} else {
}
}
});
return rootView;
}
private void addBottomDots(int currentPage) {
dots = new TextView[layouts.length];
int[] colorsActive = getResources().getIntArray(R.array.array_dot_active);
int[] colorsInactive = getResources().getIntArray(R.array.array_dot_inactive);
dotsLayout.removeAllViews();
for (int i = 0; i < dots.length; i++) {
dots[i] = new TextView(getActivity());
dots[i].setText(Html.fromHtml("•"));
dots[i].setTextSize(35);
dots[i].setTextColor(colorsInactive[currentPage]);
dotsLayout.addView(dots[i]);
}
if (dots.length > 0)
dots[currentPage].setTextColor(colorsActive[currentPage]);
}
private int getItem(int i) {
return viewPager.getCurrentItem() + i;
}
// viewpager change listener
ViewPager.OnPageChangeListener viewPagerPageChangeListener = new ViewPager.OnPageChangeListener() {
#Override
public void onPageSelected(int position) {
addBottomDots(position);
// changing the next button text 'NEXT' / 'GOT IT'
if (position == layouts.length - 1) {
// last page. make button text to GOT IT
btnNext.setText(getString(R.string.start));
btnSkip.setVisibility(View.GONE);
/**
* bluetooth connection the bot
*/
Toast.makeText(getActivity(), "Finished", Toast.LENGTH_SHORT).show();
} else {
// still pages are left
btnNext.setText(getString(R.string.next));
btnSkip.setVisibility(View.VISIBLE);
/**
* First page
*/
Toast.makeText(getActivity(), "2nd page", Toast.LENGTH_SHORT).show();
}
}
#Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
}
#Override
public void onPageScrollStateChanged(int arg0) {
}
};
#NonNull
#Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
Dialog dialog = super.onCreateDialog(savedInstanceState);
//dialog.getWindow().setBackgroundDrawable(new ColorDrawable(android.graphics.Color.TRANSPARENT));
dialog.getWindow().requestFeature(Window.FEATURE_NO_TITLE);
return dialog;
}
#Override
public void onResume() {
super.onResume();
// getDialog().getWindow().setLayout((7 * width) / 7, (4 * height) / 5);
}
public class BotConnectionDialogAdapter extends PagerAdapter {
/**
* View pager adapter
*/
private LayoutInflater layoutInflater;
public BotConnectionDialogAdapter() {
}
#Override
public Object instantiateItem(ViewGroup container, int position) {
layoutInflater = (LayoutInflater) getActivity().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View view = layoutInflater.inflate(layouts[position], container, false);
container.addView(view);
return view;
}
#Override
public int getCount() {
return layouts.length;
}
#Override
public boolean isViewFromObject(View view, Object obj) {
return view == obj;
}
#Override
public void destroyItem(ViewGroup container, int position, Object object) {
View view = (View) object;
container.removeView(view);
}
}
}
/**
* To disable and enable scrolling on ViewPager, just set shouldScroll to true or false.
*/
public class ScrollableViewPager extends ViewPager {
private boolean shouldScroll = true;
public ScrollableViewPager(Context context, AttributeSet attrs) {
super(context, attrs);
}
public void setShouldScroll(boolean shouldScroll) {
this.shouldScroll = shouldScroll;
}
#Override
public boolean onTouchEvent(MotionEvent ev) {
return shouldScroll && super.onTouchEvent(ev);
}
#Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
return shouldScroll && super.onInterceptTouchEvent(ev);
}
}
Now use this ScrollableViewPager in place of the default ViewPager and in your onPageSelected() callback
check for the position. If it is the last position, call the setShouldScroll(false) method on your viewPager instance, which will make shouldScroll to false in our ScrollableViewPager class and eventually make the scrolling invalid as we have overridden onTouchEvent() and onInterceptTouchEvent() method, which checks for the value of shouldScroll.
Related
I am making an app that contains a small questionnaire for users asking them about their food preferences. To achieve this, I am trying to create a ViewPager whose layout contains Radiobuttons inside a Radiogroup. I would like my View pager to move to the next page when the user selects a radio button. I am unable to get this to work. I couldn't find anything similar to this on Google.
Pager Adapter:
public class SliderAdapter extends PagerAdapter {
Context context;
LayoutInflater layoutInflater;
int position;
RadioGroup radioGroup;
ImageView imageView;
TextView textView;
RadioButton one, two, three;
// SharedPreferences sharedPreferences;
public SliderAdapter(Context context) {
this.context = context;
position = 0;
}
int[] images = {R.drawable.meat_preferences,
R.drawable.dairy_preferences,
R.drawable.spices_preferences};
int[] questions = {R.string.onboarding_2, R.string.onboarding_3, R.string.onboarding_4};
int[][] answers = {{R.string.onboarding_2_1, R.string.onboarding_2_2, R.string.onboarding_2_3},
{R.string.onboarding_3_1, R.string.onboarding_3_2, R.string.onboarding_3_3},
{R.string.onboarding_4_1, R.string.onboarding_4_2, R.string.onboarding_4_3}};
#Override
public int getCount() {
return questions.length;
}
#Override
public boolean isViewFromObject(#NonNull View view, #NonNull Object object) {
return view == (ConstraintLayout) object;
}
#NonNull
#Override
public Object instantiateItem(#NonNull ViewGroup container, int position) {
layoutInflater = (LayoutInflater) context.getSystemService(context.LAYOUT_INFLATER_SERVICE);
View view = layoutInflater.inflate(R.layout.onboarding_slides_layout, container, false);
imageView = view.findViewById(R.id.slide_image);
textView = view.findViewById(R.id.questions);
radioGroup = view.findViewById(R.id.radio_group);
// view.setTag("Radio" + position);
radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
#Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
RadioButton radio_button = group.findViewById(checkedId);
Toast.makeText(context, radio_button.getText(), Toast.LENGTH_SHORT)
.show();
}
});
imageView.setImageResource(images[position]);
textView.setText(questions[position]);
for (int i = 0; i < radioGroup.getChildCount(); i++) {
((RadioButton) radioGroup.getChildAt(i)).setText(answers[position][i]);
}
container.addView(view);
return view;
}
#Override
public void destroyItem(#NonNull ViewGroup container, int position, #NonNull Object object) {
container.removeView((ConstraintLayout)object);
}
}
Onboarding class which is called from the main activity:
public class Onboarding extends AppCompatActivity {
ViewPager viewPager;
LinearLayout linearLayout;
ImageView zero, one, two;
ImageView[] imageViews;
Button button;
SliderAdapter pagerAdapter;
RadioGroup radioGroup;
RadioButton option_1, option_2, option_3;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_onboarding);
viewPager = findViewById(R.id.slider);
linearLayout = findViewById(R.id.dots);
button = findViewById(R.id.next_btn);
zero = findViewById(R.id.intro_indicator_1);
one = findViewById(R.id.intro_indicator_2);
two = findViewById(R.id.intro_indicator_3);
imageViews = new ImageView[]{zero, one, two};
//call adapter
pagerAdapter = new SliderAdapter(this);
viewPager.setAdapter(pagerAdapter);
viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
#SuppressLint("UseCompatTextViewDrawableApis")
#Override
public void onPageSelected(int position) {
updateIndicators(position);
if (position == 2){
button.setVisibility(View.VISIBLE);
button.setCompoundDrawableTintList(ColorStateList.valueOf(Color.parseColor("#4D000000")));
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(getApplicationContext(), MainActivity.class);
startActivity(intent);
}
});
}
}
#Override
public void onPageScrollStateChanged(int state) {
}
});
}
void updateIndicators(int position) {
for (int i = 0; i < imageViews.length; i++) {
imageViews[i].setBackgroundResource(
i == position ? R.drawable.indicator_selected : R.drawable.indicator_unselected
);
}
}
}
How do I get the radiogroup selections in the "Onboarding" class?
just call this
mRadioGroup.check(mRadioGroup.getChildAt(0).getId());
after
mViewPager.setCurrentItem(0);
I am new to Android programming, I am creating Introduction slides using View Pager and custom adaptor. I have two introduction slides and I want the third slide to be 'sign up' activity itself. With my current implementation, the third slide is just the layout of the activity and not the activity itself.
Can you suggest how to do so?
Here is my WelcomeActivity.java (I want to start LoginActivity.java)
public class WelcomeActivity extends AppCompatActivity {
Button next;
ViewPager vp;
LinearLayout layoutBars;
MyViewPAdaptor vpAdaptor;
TextView dots[];
int[] layouts;
PrefManager prfManager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
prfManager = new PrefManager(this);
if (!prfManager.getIsFirstTimeLaunch()) {
launchHomeScreen();
finish();
}
setContentView(R.layout.activity_welcome);
next = (Button) findViewById(R.id.btn_next);
vp = (ViewPager) findViewById(R.id.view_pager);
layoutBars = (LinearLayout) findViewById(R.id.layoutDots);
vpAdaptor = new MyViewPAdaptor();
layouts = new int[]{
R.layout.welcome_screen1,
R.layout.welcome_screen2,
R.layout.activity_login};
vp.setAdapter(vpAdaptor);
// adding bottom dots
addBottomDots(0);
// making notification bar transparent
changeStatusBarColor();
vp.addOnPageChangeListener(viewPagerPageChangeListener);
next.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// checking for last page
// if last page home screen will be launched
int current = getItem(+1);
if (current < layouts.length-1) {
// move to next screen
vp.setCurrentItem(current);
} else {
launchLoginScreen();
}
}
});
}
private void addBottomDots(int currentPage) {
dots = new TextView[layouts.length];
int[] colorsActive = getResources().getIntArray(R.array.array_dot_active);
int[] colorsInactive = getResources().getIntArray(R.array.array_dot_inactive);
layoutBars.removeAllViews();
for (int i = 0; i < dots.length; i++) {
dots[i] = new TextView(this);
dots[i].setText(Html.fromHtml("•"));
dots[i].setTextSize(35);
dots[i].setTextColor(colorsInactive[currentPage]);
layoutBars.addView(dots[i]);
}
if (dots.length > 0)
dots[currentPage].setTextColor(colorsActive[currentPage]);
}
private int getItem(int i) {
return vp.getCurrentItem() + i;
}
private void launchHomeScreen() {
prfManager.setFirstTimeLaunch(false);
startActivity(new Intent(WelcomeActivity.this, MainActivity.class));
finish();
}
private void launchLoginScreen() {
prfManager.setFirstTimeLaunch(false);
startActivity(new Intent(WelcomeActivity.this, LoginActivity.class));
}
// viewpager change listener
ViewPager.OnPageChangeListener viewPagerPageChangeListener = new ViewPager.OnPageChangeListener() {
#Override
public void onPageSelected(int position) {
addBottomDots(position);
// changing the next button text 'NEXT' / 'GOT IT'
if (position == layouts.length - 1) {
// last page. make button text to GOT IT
next.setText(getString(R.string.start));
} else {
// still pages are left
next.setText(getString(R.string.next));
}
}
#Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
}
#Override
public void onPageScrollStateChanged(int arg0) {
}
};
/**
* Making notification bar transparent
*/
private void changeStatusBarColor() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
Window window = getWindow();
window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
window.setStatusBarColor(Color.TRANSPARENT);
}
}
/**
* View pager adapter
*/
public class MyViewPAdaptor extends PagerAdapter {
private LayoutInflater layoutInflater;
public MyViewPAdaptor() {
}
#Override
public Object instantiateItem(ViewGroup container, int position) {
layoutInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View view = layoutInflater.inflate(layouts[position], container, false);
container.addView(view);
return view;
}
#Override
public int getCount() {
return layouts.length;
}
#Override
public boolean isViewFromObject(View view, Object obj) {
return view == obj;
}
#Override
public void destroyItem(ViewGroup container, int position, Object object) {
View view = (View) object;
container.removeView(view);
}
}
}
viewPager.addOnPageChangeListener(new OnPageChangeListener() {
public void onPageScrollStateChanged(int state) {}
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {}
public void onPageSelected(int position) {
if (position == 2)
startActivity(new Intent(this, LoginActivity.class));
}
});
I am working on a very big project and I am told to write code in a very very efficient way. I have normally written my code but I want the intro layout also to be using mvvm. how can I do that?
my normal welcome activity is below
public class WelcomeActivity extends AppCompatActivity {
private ViewPager viewPager;
private MyViewPagerAdapter myViewPagerAdapter;
private LinearLayout dotsLayout;
private TextView[] dots;
private int[] layouts;
//private Button btnSkip, btnNext;
private LoginSession prefManager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Checking for first time launch - before calling setContentView()
prefManager = new LoginSession(this);
if (!prefManager.isFirstTimeLaunch()) {
launchHomeScreen();
finish();
}
// Making notification bar transparent
if (Build.VERSION.SDK_INT >= 21) {
getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_STABLE | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
}
setContentView(R.layout.activity_welcome);
viewPager = (ViewPager) findViewById(R.id.view_pager);
dotsLayout = (LinearLayout) findViewById(R.id.layoutDots);
/*btnSkip = (Button) findViewById(R.id.btn_skip);
btnNext = (Button) findViewById(R.id.btn_next);*/
// layouts of all welcome sliders
// add few more layouts if you want
layouts = new int[]{
R.layout.welcome_slide1,
R.layout.welcome_slide2,
R.layout.welcome_slide3
};
// adding bottom dots
addBottomDots(0);
// making notification bar transparent
changeStatusBarColor();
myViewPagerAdapter = new MyViewPagerAdapter();
viewPager.setAdapter(myViewPagerAdapter);
viewPager.addOnPageChangeListener(viewPagerPageChangeListener);
/* btnSkip.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
launchHomeScreen();
}
});
btnNext.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// checking for last page
// if last page home screen will be launched
int current = getItem(+1);
if (current < layouts.length) {
// move to next screen
viewPager.setCurrentItem(current);
} else {
launchHomeScreen();
}
}
});*/
}
private void addBottomDots(int currentPage) {
dots = new TextView[layouts.length];
int[] colorsActive = getResources().getIntArray(R.array.array_dot_active);
int[] colorsInactive = getResources().getIntArray(R.array.array_dot_inactive);
dotsLayout.removeAllViews();
for (int i = 0; i < dots.length; i++) {
dots[i] = new TextView(this);
dots[i].setText(Html.fromHtml("•"));
dots[i].setTextSize(35);
dots[i].setTextColor(colorsInactive[currentPage]);
dotsLayout.addView(dots[i]);
}
if (dots.length > 0)
dots[currentPage].setTextColor(colorsActive[currentPage]);
}
private int getItem(int i) {
return viewPager.getCurrentItem() + i;
}
private void launchHomeScreen() {
prefManager.setFirstTimeLaunch(false);
startActivity(new Intent(WelcomeActivity.this, MainActivity.class));
finish();
}
// viewpager change listener
ViewPager.OnPageChangeListener viewPagerPageChangeListener = new ViewPager.OnPageChangeListener() {
#Override
public void onPageSelected(int position) {
addBottomDots(position);
// changing the next button text 'NEXT' / 'GOT IT'
if (position == layouts.length - 1) {
// last page. make button text to GOT IT
/*btnNext.setText(getString(R.string.start));
btnSkip.setVisibility(View.GONE);*/
} else {
// still pages are left
/*btnNext.setText(getString(R.string.next));
btnSkip.setVisibility(View.VISIBLE);*/
}
}
#Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
}
#Override
public void onPageScrollStateChanged(int arg0) {
}
};
/**
* Making notification bar transparent
*/
private void changeStatusBarColor() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
Window window = getWindow();
window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
window.setStatusBarColor(Color.TRANSPARENT);
}
}
/**
* View pager adapter
*/
public class MyViewPagerAdapter extends PagerAdapter {
private LayoutInflater layoutInflater;
public MyViewPagerAdapter() {
}
#Override
public Object instantiateItem(ViewGroup container, int position) {
layoutInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View view = layoutInflater.inflate(layouts[position], container, false);
container.addView(view);
return view;
}
#Override
public int getCount() {
return layouts.length;
}
#Override
public boolean isViewFromObject(View view, Object obj) {
return view == obj;
}
#Override
public void destroyItem(ViewGroup container, int position, Object object) {
View view = (View) object;
container.removeView(view);
}
}
}
My sharedpreferences is as below
public class LoginSession {
SharedPreferences pref;
SharedPreferences.Editor editor;
Context _context;
int PRIVATE_MODE = 0;
public LoginSession(Context context) {
this._context = context;
pref = _context.getSharedPreferences(Constants.PREF_NAME, PRIVATE_MODE);
editor = pref.edit();
}
public void createLoginSession(JsonObject jsonObject)
{
editor.putBoolean(Constants.LOGGED_IN,true);
editor.putString(Constants.API_TOKEN,jsonObject.get("token_key").getAsString());
editor.putString(Constants.USERNAME,jsonObject.get("username").getAsString());
editor.putInt(Constants.ID,jsonObject.get("id").getAsInt());
editor.commit();
}
public boolean isLoggedIn() {
return pref.getBoolean(Constants.LOGGED_IN, false);
}
public Map<String, String> getLoginDetails() {
Map<String, String> logindetailsMap=new HashMap<>();
logindetailsMap.put(Constants.LOGGED_IN,pref.getString(Constants.LOGGED_IN,null));
logindetailsMap.put(Constants.USERNAME,pref.getString(Constants.USERNAME,null));
logindetailsMap.put(Constants.API_TOKEN,pref.getString(Constants.API_TOKEN,null));
logindetailsMap.put(Constants.ID, String.valueOf(pref.getInt(Constants.ID,0)));
return logindetailsMap;
}
public void setFirstTimeLaunch(boolean isFirstTime) {
editor.putBoolean(IS_FIRST_TIME_LAUNCH, isFirstTime);
editor.commit();
}
public boolean isFirstTimeLaunch() {
return pref.getBoolean(IS_FIRST_TIME_LAUNCH, true);
}
}
I have already used livedata. please help me modify this code
For starters, you should use data binding instead of "findViewById". This would be a good starting point to see how to bind your fields and buttons.
Also , please see how the code is divided into View, ViewModel and Model
I am using Memory analyzer tool to detect posssible memory leak in my application and below is the image of heap profile which is saying i have 5 object of IntroActivity below is my code for introactivity i am not able to find from where this objects are created multiple times
public class IntroActivity extends AppCompatActivity {
[![enter image description here][1]][1]
private ViewPager viewPager;
private MyViewPagerAdapter myViewPagerAdapter=new MyViewPagerAdapter();
private LinearLayout dotsLayout;
private TextView[] dots;
private int[] layouts;
private Context context;
private Button btnSkip, btnNext;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Checking for first time launch - before calling setContentView()
context=IntroActivity.this;
// Making notification bar transparent
if (Build.VERSION.SDK_INT >= 21) {
getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_STABLE | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
}
setContentView(R.layout.intro_layout);
viewPager = (ViewPager) findViewById(R.id.view_pager);
dotsLayout = (LinearLayout) findViewById(R.id.layoutDots);
btnSkip = (Button) findViewById(R.id.btn_skip);
btnNext = (Button) findViewById(R.id.btn_next);
// layouts of all welcome sliders
// add few more layouts if you want
layouts = new int[]{
R.layout.intro_first_screen,
R.layout.intro_second_screen,
R.layout.intro_third_screen,
R.layout.intro_fourth_screen,
R.layout.intro_fifth_screen,
R.layout.intro_sixth_screen,
R.layout.intro_seventh_screen,
R.layout.intro_eighth_screen};
// adding bottom dots
addBottomDots(0);
// making notification bar transparent
changeStatusBarColor();
viewPager.setAdapter(myViewPagerAdapter);
viewPager.addOnPageChangeListener(viewPagerPageChangeListener);
btnSkip.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
launchHomeScreen();
}
});
btnNext.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// checking for last page
// if last page home screen will be launched
int current = getItem(+1);
if (current < layouts.length) {
// move to next screen
viewPager.setCurrentItem(current);
} else {
launchHomeScreen();
}
}
});
}
private void addBottomDots(int currentPage) {
dots = new TextView[layouts.length];
int[] colorsActive = getResources().getIntArray(R.array.array_dot_active);
int[] colorsInactive = getResources().getIntArray(R.array.array_dot_inactive);
dotsLayout.removeAllViews();
for (int i = 0; i < dots.length; i++) {
dots[i] = new TextView(this);
dots[i].setText(Html.fromHtml("•"));
dots[i].setTextSize(35);
dots[i].setTextColor(colorsInactive[currentPage]);
dotsLayout.addView(dots[i]);
}
if (dots.length > 0)
dots[currentPage].setTextColor(colorsActive[currentPage]);
}
private int getItem(int i) {
return viewPager.getCurrentItem() + i;
}
private void launchHomeScreen() {
finish();
}
#Override
public void onBackPressed() {
super.onBackPressed();
finish();
}
// viewpager change listener
ViewPager.OnPageChangeListener viewPagerPageChangeListener = new ViewPager.OnPageChangeListener() {
#Override
public void onPageSelected(int position) {
addBottomDots(position);
// changing the next button text 'NEXT' / 'GOT IT'
if (position == layouts.length - 1) {
// last page. make button text to GOT IT
btnNext.setText(getString(R.string.start));
btnSkip.setVisibility(View.GONE);
} else {
// still pages are left
btnNext.setText(context.getResources().getString(R.string.next));
btnSkip.setVisibility(View.VISIBLE);
}
}
#Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
}
#Override
public void onPageScrollStateChanged(int arg0) {
}
};
/**
* Making notification bar transparent
*/
private void changeStatusBarColor() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
Window window = getWindow();
window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
window.setStatusBarColor(Color.TRANSPARENT);
}
}
/**
* View pager adapter
*/
public class MyViewPagerAdapter extends PagerAdapter {
private LayoutInflater layoutInflater;
public MyViewPagerAdapter() {
}
#Override
public Object instantiateItem(ViewGroup container, int position) {
layoutInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View view = layoutInflater.inflate(layouts[position], container, false);
container.addView(view);
return view;
}
#Override
public int getCount() {
return layouts.length;
}
#Override
public boolean isViewFromObject(View view, Object obj) {
return view == obj;
}
#Override
public void destroyItem(ViewGroup container, int position, Object object) {
View view = (View) object;
container.removeView(view);
}
}
#Override
protected void onDestroy() {
super.onDestroy();
}
can anyone please help in find possible leak any help is appriciated
No, you did not have 5 objects of IntroActivity.
Heap profile says there are one instance of IntroActivity and 4 instances that is inner class of IntroActivity.
Inner classes are below including anonymous class.
btnNext.setOnClickListener(new View.OnClickListener() {
...
}
btnNext.setOnClickListener(new View.OnClickListener() {
...
}
ViewPager.OnPageChangeListener viewPagerPageChangeListener = new ViewPager.OnPageChangeListener() {
...
}
public class MyViewPagerAdapter extends PagerAdapter {
...
}
Use LeakCanary to detect memory leaks.
https://github.com/square/leakcanary
Is it possible to user View pager without fragments. I google it, and all examples use fragments for view pager. I want to pager load only one item from my list, so I want to ask is it possible. Here is my code for main activity, and I want to use UpdateDisplay for viewpager. Any suggestions.
public class MainActivity extends Activity implements OnClickListener{
private Button prev, next;
private TextView tv;
private int number = 0;
private ArrayList<Integer> numbers;
private ViewPager pager;
private MyPagerAdapter adapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
prev = (Button) findViewById(R.id.prevButton);
prev.setOnClickListener(this);
next = (Button) findViewById(R.id.nextButton);
next.setOnClickListener(this);
numbers = new ArrayList<Integer>();
for (int i=0;i<5;i++){
numbers.add(i);
Log.i("Sljedece elemente dodaje u listu", String.valueOf(i));
}
tv = (TextView) findViewById(R.id.rezultatTextView);
pager = (ViewPager) findViewById(R.id.pager);
adapter = new MyPagerAdapter();
pager.setAdapter(adapter);
updateDIsplay(number);
}
#Override
public void onClick(View v) {
switch(v.getId()){
case R.id.prevButton:
number--;
if (number==-1){
number = 4;
}
updateDIsplay(number);
break;
case R.id.nextButton:
number++;
if (number==5){
number = 0;
}
updateDIsplay(number);
break;
}
}
private void updateDIsplay(int z){
tv.setText(String.valueOf(numbers.get(z)));
}
private class MyPagerAdapter extends PagerAdapter{
#Override
public int getCount() {
return numbers.size();
}
#Override
public boolean isViewFromObject(View arg0, Object arg1) {
return false;
}
}
}
yes it possible. Use a PageAdapter. When instantiateItem is called, you can inflate/instantiate your view, and this to the container. E.g:
private class MyPagerAdapter extends PagerAdapter {
#Override
public Object instantiateItem(ViewGroup container, int position) {
TextView view = new TextView(PagerActivity.this);
view.setText("Item "+position);
view.setGravity(Gravity.CENTER);
view.setBackgroundColor(Color.argb(255, position * 50, position * 10, position * 50));
container.addView(view);
return view;
}
#Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView((View)object);
}
#Override
public int getCount() {
return 5;
}
#Override
public boolean isViewFromObject(View view, Object object) {
return (view == object);
}
}