Android collapsing toolbar example in Kotlin
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:layout_width="match_parent" android:layout_height="match_parent" android:fitsSystemWindows="true" tools:context="com.example.myapplication.MainActivity"> <android.support.design.widget.AppBarLayout android:id="@+id/app_bar" android:layout_width="match_parent" android:layout_height="@dimen/app_bar_height" android:fitsSystemWindows="true" android:theme="@style/AppTheme.AppBarOverlay"> <android.support.design.widget.CollapsingToolbarLayout android:id="@+id/toolbar_layout" android:layout_width="match_parent" android:layout_height="match_parent" android:fitsSystemWindows="true" app:contentScrim="?attr/colorPrimary" app:layout_scrollFlags="scroll|exitUntilCollapsed" app:toolbarId="@+id/toolbar"> <ImageView android:id="@+id/image" android:layout_width="match_parent" android:layout_height="match_parent" android:src="@drawable/a" android:fitsSystemWindows="true" android:scaleType="centerCrop" app:layout_collapseMode="parallax" /> <android.support.v7.widget.Toolbar android:id="@+id/toolbar" android:layout_width="match_parent" android:layout_height="?attr/actionBarSize" app:layout_collapseMode="pin" app:popupTheme="@style/AppTheme.PopupOverlay" /> </android.support.design.widget.CollapsingToolbarLayout> </android.support.design.widget.AppBarLayout> <android.support.v4.widget.NestedScrollView 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" app:layout_behavior="@string/appbar_scrolling_view_behavior" tools:context="com.example.myapplication.MainActivity" tools:showIn="@layout/activity_main"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_margin="@dimen/text_margin" android:text="@string/large_text" /> </android.support.v4.widget.NestedScrollView> </android.support.design.widget.CoordinatorLayout>
toolbar_menu.xml
<menu 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" tools:context="com.example.myapplication.MainActivity"> <item android:id="@+id/action_settings" android:orderInCategory="100" android:title="@string/action_settings" app:showAsAction="never" /> </menu>
MainActivity.kt
import android.os.Bundle import android.support.design.widget.CollapsingToolbarLayout import android.support.v7.app.AppCompatActivity import android.support.v7.widget.Toolbar import android.view.Menu import android.view.MenuItem class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) val toolbar = findViewById<Toolbar>(R.id.toolbar) setSupportActionBar(toolbar) val collapsingToolbar = findViewById<CollapsingToolbarLayout>(R.id.toolbar_layout) collapsingToolbar.title = "This is the title" } override fun onCreateOptionsMenu(menu: Menu): Boolean { // Inflate the menu; this adds items to the action bar if it is present. menuInflater.inflate(R.menu.toolbar_menu, menu) return true } override fun onOptionsItemSelected(item: MenuItem): Boolean { // 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. val id = item.itemId return if (id == R.id.action_settings) { true } else super.onOptionsItemSelected(item) } }
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