I want to add a button (id='Home') which take me to the main activity i use those codes but it is not reacting, this is a sample of my project in GITHUB please check it from HERE ( the problem has been fixed by @advice-dog , it has been added to the this project)
in layout of the ViewPager I have :
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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/bg2"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:theme="@style/AppFullScreenTheme"
tools:context=".License">
<android.support.v4.view.ViewPager
android:id="@+id/view_pager"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:visibility="visible"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
in there class I have:
package com.medanis.fneclis
import android.content.Intent
import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.support.v4.view.ViewPager
import kotlinx.android.synthetic.main.activity_license.*
class License : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_license)
val viewPager = findViewById<ViewPager>(R.id.view_pager)
viewPager.adapter = CustomPagerAdapter(this)
}
}
in the first PAGE of the ViewPager where I have the button Home:
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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/l1_bg"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/fneclis_l1_bg"
tools:context=".AllButtons">
<Button
android:id="@+id/Home"
android:layout_width="56dp"
android:layout_height="53dp"
android:layout_marginBottom="523dp"
android:layout_marginEnd="312dp"
android:layout_marginLeft="16dp"
android:layout_marginRight="312dp"
android:layout_marginStart="16dp"
android:layout_marginTop="16dp"
android:background="@drawable/ic_home_black_24dp"
android:contentDescription="@string/todo"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
which is related to the class AllButtons (I want to use it in the most pages of the ViewPage but not all of them):
package com.medanis.fneclis
import android.content.Intent
import android.os.Bundle
import android.support.v7.app.AppCompatActivity
import kotlinx.android.synthetic.main.activity_l1_page.*
class AllButtons: AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_l1_page)
// those are some other pages which contains the same button and they are inside the ViewPager
/* setContentView(R.layout.activity_l2_page)
setContentView(R.layout.activity_l3_page)
setContentView(R.layout.activity_m1page)
setContentView(R.layout.activity_m2page)*/
Home.setOnClickListener{
val intent = Intent(this, MainActivity::class.java)
startActivity(intent)
}
} }
THe ADAPTER :
package com.medanis.fneclis
import android.app.Activity
import android.content.Context
import android.support.v4.view.PagerAdapter
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
class CustomPagerAdapter(private val mContext: Context) : PagerAdapter() {
override fun instantiateItem(collection: ViewGroup, position: Int): Any {
val modelObject = ModelObject.values()[position]
val inflater = LayoutInflater.from(mContext)
val viewGroup = inflater.inflate(modelObject.titleResId, collection, false) as ViewGroup
collection.addView(viewGroup)
return viewGroup
}
override fun destroyItem(collection: ViewGroup, position: Int, view: Any) {
collection.removeView(view as View)
}
override fun getCount(): Int {
return ModelObject.values().size
}
override fun isViewFromObject(view: View, `object`: Any): Boolean {
return view === `object`
}
override fun getPageTitle(position: Int): CharSequence {
val customPagerEnum = ModelObject.values()[position]
return mContext.getString(customPagerEnum.titleResId)
}
override fun getItemPosition(`object`: Any): Int {
return super.getItemPosition(`object`)
}
}
ModelObject :
package com.medanis.fneclis
enum class ModelObject private constructor(val titleResId: Int ) {
LICENSEONE(R.layout.activity_l1_page),
PAGEONE(R.layout.activity_l1s1page),
PAGETWO(R.layout.activity_l1s2page),
LICENSETWO(R.layout.activity_l2_page),
PAGETHREE(R.layout.activity_l2_s3page),
PAGEFOUR(R.layout.activity_l2_s4page),
LICENSETHREE(R.layout.activity_l3_page),
PAGEFIVE(R.layout.activity_l3_s5page),
PAGESIX(R.layout.activity_l3_s6page),
}
I rewrote your code a bit, I'll explain some tips and suggestions on how to improve.
First, always add Actvitiy or Fragment to the end of your Activities or Fragments, this will help make things a lot easier to understand.
class LicenseActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_license)
// You can simply use the id of the View here.
view_pager.adapter = CustomPagerAdapter(supportFragmentManager)
}
}
Next, I changed your AllButtons Activity into a Fragment.
This code is a bit more complex, but it's using a very common pattern, the newInstance pattern. To create a new Fragment, you want to make a static method that will return a Fragment with your values passed into the arguments.
So, to explain it a bit more. You make a function called newInstance that takes the information this Fragment should be aware of, in this case, the layout we want it to show.
Next, you create a Bundle, and put the layout into it.
And then lastly you assign your Fragment's arguments to the Bundle.
This is the safest way to create Fragments.
class AllButtonsFragment : Fragment() {
companion object {
private const val EXTRA_COLOR = "EXTRA_COLOR"
private const val EXTRA_LAYOUT = "EXTRA_LAYOUT"
fun newInstance(modelObject: ModelObject): Fragment {
val fragment = AllButtonsFragment()
// Creating a Bundle with the various values we want to pass, such as the color and layout.
val bundle = Bundle()
bundle.putInt(EXTRA_COLOR, modelObject.titleResId)
bundle.putInt(EXTRA_LAYOUT, modelObject.layoutResId)
fragment.arguments = bundle
return fragment
}
}
// Getting the layout from the arguments to inflate the View.
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
val layout = arguments?.getInt(EXTRA_LAYOUT)
?: throw IllegalStateException("arguments does not contain a layout.")
return inflater.inflate(layout, container, false)
}
override fun onViewCreated(view: View?, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
val color = arguments?.getInt(EXTRA_COLOR)
// TODO: Do whatever with your colour.
// Using findViewById since this isn't on every layout.
view?.findViewById<View>(R.id.Home)?.setOnClickListener {
val intent = Intent(context, MainActivity::class.java)
startActivity(intent)
}
}
}
Next, I rewrote your Adapter to work with Fragments. This will just get the position of the page, pass it to our newInstance function, and get a Fragment for you.
class CustomPagerAdapter(fm: FragmentManager) : FragmentStatePagerAdapter(fm) {
override fun getItem(position: Int): Fragment {
val modelObject = ModelObject.values()[position]
// Creating a new instance of our Fragment with this Model Object.
return AllButtonsFragment.newInstance(modelObject)
}
override fun getCount() = ModelObject.values().size
}