Android Studio-09【第一款隨機選號App (尾牙,抽獎超實用) Random number】

日期：

   <第一款隨機選號App (尾牙,抽獎超實用) Random number> 


App實際效果影片如下 As the following video :



   【activity_main.xml】

     As the following code:

 
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    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:orientation="vertical"
    android:theme="@style/Theme.AppCompat.Light.NoActionBar"
    tools:context=".MainActivity">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="10"
        android:background="#ff0"
        android:gravity="center"
        android:text="隨機產生號碼1~99"
        android:textColor="#000000"
        android:textSize="27dp"
        android:textStyle="bold"
        tools:ignore="TextContrastCheck" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="20"
        android:orientation="vertical"
        android:paddingHorizontal="12dp"
        android:paddingTop="12dp">
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="第n組"/>

        <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
            <TextView
                android:id="@+id/num0"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="-"
                android:textColor="#fff"
                android:textStyle="bold"
                android:gravity="center"
                android:textSize="20sp"
                android:background="@drawable/number_bg"/>
            <TextView
                android:id="@+id/num1"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="-"
                android:textColor="#fff"
                android:textStyle="bold"
                android:gravity="center"
                android:textSize="20sp"
                android:background="@drawable/number_bg"/>
            <TextView
                android:id="@+id/num2"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="-"
                android:textColor="#fff"
                android:textStyle="bold"
                android:gravity="center"
                android:textSize="20sp"
                android:background="@drawable/number_bg"/>

            <TextView
                android:id="@+id/num3"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="-"
                android:textColor="#fff"
                android:textStyle="bold"
                android:gravity="center"
                android:textSize="20sp"
                android:background="@drawable/number_bg"/>
            <TextView
                android:id="@+id/num4"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="-"
                android:textColor="#fff"
                android:textStyle="bold"
                android:gravity="center"
                android:textSize="20sp"
                android:background="@drawable/number_bg"/>
            <TextView
                android:id="@+id/num5"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="-"
                android:textColor="#fff"
                android:textStyle="bold"
                android:gravity="center"
                android:textSize="20sp"
                android:background="@drawable/number_bg"/>
        </LinearLayout>
    </LinearLayout>

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="60">
        <Button
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="按下隨機產生 Click"
            android:textColor="#000000"
            android:background="#ffd700"
            android:textSize="27dp"
            android:textStyle="bold"
            android:layout_alignParentBottom="true"
            android:layout_marginHorizontal="12dp"
            android:onClick="lottery"/>

    </RelativeLayout>


</LinearLayout>




【MainActivity】

     As the following code:

 
import java.util.HashSet;

public class MainActivity extends AppCompatActivity {
    private TextView num0,num1,num2,num3,num4,num5;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        num0 = findViewById(R.id.num0);
        num1 = findViewById(R.id.num1);
        num2 = findViewById(R.id.num2);
        num3 = findViewById(R.id.num3);
        num4 = findViewById(R.id.num4);
        num5 = findViewById(R.id.num5);

    }

    public void lottery(View view) {
        HashSet<Integer> set = new HashSet<>();
        while (set.size()<6){
            set.add((int)(Math.random()*99+1));
        }

        int i = 0;
        int[] lottery = new int[6];
        for (Integer num : set){
            lottery[i] = num;
            i++;
        }

        num0.setText("" + lottery[0]);
        num1.setText("" + lottery[1]);
        num2.setText("" + lottery[2]);
        num3.setText("" + lottery[3]);
        num4.setText("" + lottery[4]);
        num5.setText("" + lottery[5]);

    }
}