[Android] Spinner

示範

XML

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"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    >

    <TextView
        android:id="@+id/t1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="8dp"
        android:text="選擇天氣"
        app:layout_constraintBottom_toTopOf="@+id/sp1"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent" />

    <Spinner
        android:id="@+id/sp1"
        android:layout_width="368dp"
        android:layout_height="26dp"
        android:entries="@array/season"
        android:spinnerMode="dialog"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

android.support.constraint.ConstraintLayout>

JAVA

public class MainActivity extends AppCompatActivity implements AdapterView.OnItemSelectedListener {
    TextView t1;
    Spinner sp1;
    String[] sp1s={"春","夏","秋","冬"};
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        t1=(TextView)findViewById(R.id.t1);
        sp1=(Spinner)findViewById(R.id.sp1);
        sp1.setOnItemSelectedListener(this);
    }
    public void onItemSelected(AdapterView> parent, View view,int position,long id){
        t1.setText(String.valueOf(sp1s[position]));
    }
    @Override
    public void onNothingSelected(AdapterView> parent) {
    }
}

展示