蔡季樺

1. package com.example.plantsai.myapplicationspinner;
   
2. 
   
3. import android.support.v7.app.AppCompatActivity;
   
4. import android.os.Bundle;
   
5. import android.view.View;
   
6. import android.widget.AdapterView;
   
7. import android.widget.ArrayAdapter;
   
8. import android.widget.Spinner;
   
9. import android.widget.Toast;
   
10. 
    
11. public class MainActivity extends AppCompatActivity {
    
12.     String names[]={"烤雞","龍蝦","披薩","沙拉","牛排"};
    
13.     Spinner spinner;
    
14.     ArrayAdapter arrayAdapter;
    
15.     @Override
    
16.     protected void onCreate(Bundle savedInstanceState) {
    
17.         super.onCreate(savedInstanceState);
    
18.         setContentView(R.layout.activity_main);
    
19.         spinner = findViewById(R.id.spinner);
    
20.         arrayAdapter = new ArrayAdapter(this,R.layout.sp_tv,names);
    
21.         spinner.setAdapter(arrayAdapter);
    
22.         spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
    
23.             @Override
    
24.             public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
    
25.                 Toast.makeText(MainActivity.this,"您點了一份"+names[position],Toast.LENGTH_SHORT).show();
    
26.             }
    
27. 
    
28.             @Override
    
29.             public void onNothingSelected(AdapterView<?> parent) {
    
30. 
    
31.             }
    
32.         });
    
33.     }
    
34. }

複製代碼

1. <?xml version="1.0" encoding="utf-8"?>
   
2. <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
   
3.     xmlns:app="http://schemas.android.com/apk/res-auto"
   
4.     xmlns:tools="http://schemas.android.com/tools"
   
5.     android:layout_width="match_parent"
   
6.     android:layout_height="match_parent"
   
7.     tools:context=".MainActivity">
   
8. 
   
9.     <Spinner
   
10.         android:id="@+id/spinner"
    
11.         android:layout_width="0dp"
    
12.         android:layout_height="wrap_content"
    
13.         android:layout_marginBottom="8dp"
    
14.         android:layout_marginEnd="40dp"
    
15.         android:layout_marginStart="40dp"
    
16.         android:layout_marginTop="8dp"
    
17.         app:layout_constraintBottom_toBottomOf="parent"
    
18.         app:layout_constraintEnd_toEndOf="parent"
    
19.         app:layout_constraintHorizontal_bias="0.0"
    
20.         app:layout_constraintStart_toStartOf="parent"
    
21.         app:layout_constraintTop_toTopOf="parent"
    
22.         app:layout_constraintVertical_bias="0.115" />
    
23. 
    
24. </android.support.constraint.ConstraintLayout>

複製代碼

1. <?xml version="1.0" encoding="utf-8"?>
   
2. <TextView xmlns:android="http://schemas.android.com/apk/res/android"
   
3.     xmlns:tools="http://schemas.android.com/tools"
   
4.     android:layout_width="match_parent"
   
5.     android:layout_height="match_parent"
   
6.     android:textSize="24sp"></TextView>

複製代碼