I have this home button in top bar:
val activity: ImageButton =findViewById(R.id.activity)
activity.setOnClickListener{
startActivity(Intent(this, ActivitySearch::class.java))
}
Instead of going to a new page, I want to be able to just put a "to top" intent, I have tried to replace:
startActivity(Intent(this, ActivitySearch::class.java))
with
mRecyclerView.smoothScrollToPosition(0);
But this does not work, any ideas? I do have a RecyclerView in use so half way down, I want to be able to click the above button and it goes straight to the top.
Total code:
private val apiService by lazy {
ApiClient.create()
}
private var taskData : ArrayList<TaskResponse> = arrayListOf();
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
val activity: ImageButton =findViewById(R.id.activity)
activity.setOnClickListener{
startActivity(Intent(this, ActivitySearch::class.java))
}
val searchbutton:ImageButton=findViewById(R.id.searchbutton)
searchbutton.setOnClickListener{
startActivity(Intent(this, ActivitySearch::class.java))
}
val saves:ImageButton=findViewById(R.id.saves)
saves.setOnClickListener{
startActivity(Intent(this, ActivitySaves::class.java))
}
val settings:ImageButton=findViewById(R.id.settings)
settings.setOnClickListener{
startActivity(Intent(this, ActivitySettings::class.java))
}
loadData();
}
private fun loadData(){
var data = apiService.getMainData();
data.enqueue(object : Callback<ArrayList<TaskResponse>> {
override fun onResponse(
call: Call<ArrayList<TaskResponse>>,
response: Response<ArrayList<TaskResponse>>
) {
if (response.code() == 200) {
taskData = response.body()!!;
displaydata();
}
}
override fun onFailure(call: Call<ArrayList<TaskResponse>>, t: Throwable) {
Log.d("-----------------", t.toString())
}
})
}
private fun displaydata(){
var recyclerView = findViewById<RecyclerView>(R.id.mainList);
var adapter = TaskAdapter(this, taskData);
recyclerView.layoutManager = LinearLayoutManager(this)
recyclerView.adapter = adapter
val swipeRefreshLayout: SwipeRefreshLayout = findViewById(R.id.swipeRefreshLayout)
// load data on swipe refresh.
swipeRefreshLayout.setOnRefreshListener { loadData() }
// Disable the refreshing after data load
swipeRefreshLayout.isRefreshing = false
}
And what i'm using for activity page:
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<View
android:id="@ id/view"
android:layout_width="match_parent"
android:layout_height="0.1dp"
android:background="#6A6A6A"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@ id/searchbutton"
app:layout_constraintVertical_bias="0.01" />
<TextView
android:id="@ id/textView"
android:layout_width="wrap_content"
android:layout_height="46dp"
android:gravity="center"
android:text="@string/w2d"
android:textColor="@color/black"
android:textSize="25sp"
android:textStyle="bold"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.047"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.01" />
<ImageButton
android:id="@ id/activity"
android:layout_width="45dp"
android:layout_height="46dp"
android:layout_gravity="center"
android:layout_marginEnd="10dp"
android:layout_marginRight="10dp"
android:background="#FFFFFF"
android:contentDescription="@string/activities"
android:src="@drawable/ic_home"
android:tint="#00B0F0"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.107"
app:layout_constraintStart_toEndOf="@ id/textView"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.01" />
<ImageButton
android:id="@ id/searchbutton"
android:layout_width="48dp"
android:layout_height="48dp"
android:layout_gravity="center"
android:layout_marginEnd="10dp"
android:layout_marginRight="10dp"
android:background="#FFFFFF"
android:contentDescription="@string/activities"
android:src="@drawable/ic_search"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.154"
app:layout_constraintStart_toEndOf="@ id/activity"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.01" />
<ImageButton
android:id="@ id/saves"
android:layout_width="48dp"
android:layout_height="48dp"
android:layout_gravity="center"
android:layout_marginEnd="10dp"
android:layout_marginRight="10dp"
android:background="#FFFFFF"
android:contentDescription="@string/activities"
android:src="@drawable/ic_saves"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.242"
app:layout_constraintStart_toEndOf="@ id/searchbutton"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.01" />
<ImageButton
android:id="@ id/settings"
android:layout_width="48dp"
android:layout_height="48dp"
android:layout_gravity="center"
android:layout_marginEnd="10dp"
android:layout_marginRight="10dp"
android:background="#FFFFFF"
android:contentDescription="@string/activities"
android:src="@drawable/ic_setting"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.673"
app:layout_constraintStart_toEndOf="@ id/saves"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.01" />
<androidx.swiperefreshlayout.widget.SwipeRefreshLayout
android:id="@ id/swipeRefreshLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#00FFFFFF"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toBottomOf="@ id/view"
app:layout_constraintHorizontal_bias="0.0">
<androidx.recyclerview.widget.RecyclerView
android:id="@ id/mainList"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#F0F2F5"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintTop_toBottomOf="@ id/view"
app:layout_constraintVertical_bias="0"
tools:layout_editor_absoluteX="0dp" />
</androidx.swiperefreshlayout.widget.SwipeRefreshLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
CodePudding user response：
This should work for going to the top of the recyclerView.
mRecyclerView.smoothScrollToPosition(0);
or
mRecyclerView.scrollToPosition(0);
When your list changes in recyclerView adapter, you should use that code. Make sure other parts of the code. This should work.
CodePudding user response：
Using a comments answer from @cactustictacs, I edited my code to this and it worked:
val activity: ImageButton =findViewById(R.id.activity)
val mRecyclerView = findViewById<RecyclerView>(R.id.mainList)
activity.setOnClickListener{
mRecyclerView.smoothScrollToPosition(0)
}