em kotlin: uma ListView XML array adapter
ficheiro: MainActivity.kt
package pt.deis.estuda.estudolistview import android.content.Intent import androidx.appcompat.app.AppCompatActivity import android.os.Bundle import android.view.View const val TAG = "ListView" class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) } //nvoas actividades para fun onListView1(view: View) { val intent = Intent(this,ListView1Activity::class.java) startActivity(intent) } }
ficheiro: activity_main.xml
<?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" android:background="#f0f0f0" android:padding="16dp" tools:context=".MainActivity"> <Button android:onClick="onListView1" android:id="@+id/button" android:layout_width="0dp" android:layout_height="wrap_content" android:padding="16dp" android:text="ListView XML array adapter" android:textSize="24sp" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintHorizontal_bias="0.5" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent" /> </androidx.constraintlayout.widget.ConstraintLayout>
ficheiro: activity_list_view.xml
<?xml version="1.0" encoding="utf-8"?> <FrameLayout 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=".ListView1Activity"> <ListView android:id="@+id/primeiraListView" android:layout_width="match_parent" android:layout_height="match_parent" /> </FrameLayout>
ficheiro: arrays.xml
<?xml version="1.0" encoding="utf-8"?> <resources> <string-array name="dados_str"> <item>Portugal</item> <item>Espanha</item> <item>Franca</item> <item>Italia</item> <item>Alemanha</item> <item>Belgica</item> <item>Holanda</item> <item>Austria</item> <item>Luxemburgo</item> <item>Suecia</item> <item>Dinamarca</item> <item>Irlanda</item> <item>Croacia</item> <item>Eslovenia</item> <item>Eslovaquia</item> <item>Estonia</item> <item>Polonia</item> <item>Grecia</item> <item>Finlandia</item> <item>Chipre</item> <item>Malta</item> <item>Bulgaria</item> <item>Hungria</item> <item>Romenia</item> <item>Rep. Checa</item> <item>Letonia</item> <item>Lituania</item> </string-array> </resources>
ficheiro: AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="pt.deis.estuda.estudolistview"> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/Theme.Estudolistview"> <activity android:name=".ListView1Activity" android:label="ListView" android:parentActivityName=".MainActivity" /> <activity android:name=".MainActivity"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
ficheiro: ListView1Activity.kt
package pt.deis.estuda.estudolistview import android.os.Bundle import android.util.Log import android.widget.ArrayAdapter import androidx.appcompat.app.AppCompatActivity import kotlinx.android.synthetic.main.activity_list_view.* class ListView1Activity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_list_view) supportActionBar?.setDisplayHomeAsUpEnabled(true) supportActionBar?.subtitle = "Exemplo XML array list" //uma lista não ordenada em arrays.xml val paises = resources.getStringArray(R.array.dados_str) paises.sort() //usar um adapter para mostrar a listview //contexto (actividades), layout que só tem uma textview, a fonte dos dados (array das strings) val adapter = ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,paises) primeiraListView.adapter = adapter primeiraListView.setOnItemClickListener() { parent, view, pos, id -> Log.i(TAG, "Item: $pos $id") } } }
ficheiro: build.gralde (Module)
plugins { id 'com.android.application' id 'kotlin-android' id 'kotlin-android-extensions' // obrigatorio para aceder aos diferentes layouts sem usar o findId } ...
Tags : amov, android, arquitecturas móveis (kotlin), kotlin, Learn android, t2021
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