Zi 字媒體

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