小程序：*机选神器 ！

package com.lixu.caipiao;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;

public class MainActivity extends Activity implements OnClickListener {
    Button btn1;
    Button btn2;
    Button btn3;
    EditText et1;
    EditText et2;
    EditText et3;
    StringBuffer sb;
    StringBuffer sb2;
    StringBuffer sb3;

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

        btn1 = (Button) findViewById(R.id.btn1);
        btn2 = (Button) findViewById(R.id.btn2);
        btn3 = (Button) findViewById(R.id.btn3);
        et1 = (EditText) findViewById(R.id.et1);
        et2 = (EditText) findViewById(R.id.et2);
        et3 = (EditText) findViewById(R.id.et3);
        btn1.setOnClickListener(this);
        btn2.setOnClickListener(this);
        btn3.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
        case R.id.btn1:
            sb = new StringBuffer();
            shuang();
            et1.setText(sb);
            break;
        case R.id.btn2:
            sb2 = new StringBuffer();
            daletou();
            et2.setText(sb2);
            break;
        case R.id.btn3:
            sb3 = new StringBuffer();
            qixing();
            et3.setText(sb3);
            break;

        default:
            break;
        }

    }

    public void shuang() {
        int[] a = new int[7];
        int i = 0;
        while (i < 6) {
            int b = (int) (Math.random() * 33) + 1;
            boolean temp = true;
            for (int m = 0; m < a.length - 1; m++) {
                if (a[m] == b) {
                    temp = false;
                }
            }

            if (!temp) {
                continue;
            }
            a[i] = b;
            i++;
        }
        for (int l = 0; l < a.length - 1; l++) {
            for (int h = 0; h < a.length - 1; h++) {
                if (a[l] < a[h]) {
                    int temp = a[l];
                    a[l] = a[h];
                    a[h] = temp;
                }
            }
        }
        int k = (int) (Math.random() * 16) + 1;
        a[6] = k;
        for (int n : a) {
            sb.append(n + ",");
        }
    }

    public void daletou() {
        int[] a = new int[7];
        int i = 0;
        while (i < 5) {
            int b = (int) (Math.random() * 35) + 1;
            boolean temp = true;
            for (int e = 0; e < a.length - 2; e++) {
                if (a[e] == b) {
                    temp = false;
                }
            }
            if (!temp) {
                continue;
            }
            a[i] = b;
            i++;
        }
        for (int m = 0; m < a.length - 2; m++) {
            for (int n = m + 1; n < a.length - 2; n++) {
                if (a[m] > a[n]) {
                    int temp1 = a[m];
                    a[m] = a[n];
                    a[n] = temp1;
                }
            }
        }
        while (i > 4 && i < 7) {
            int k = (int) (Math.random() * 12) + 1;
            boolean temp2 = true;
            for (int e = 5; e < 7; e++) {
                if (a[e] == k) {
                    temp2 = false;
                }
            }
            if (!temp2) {
                continue;
            }
            a[i] = k;
            i++;
        }
        for (int m = 5; m < 7; m++) {
            for (int n = m + 1; n < 7; n++) {
                if (a[m] > a[n]) {
                    int temp1 = a[m];
                    a[m] = a[n];
                    a[n] = temp1;
                }
            }
        }
        for (int n : a) {
            sb2.append(n + ",");
        }
    }

    public void qixing() {
        int[] a = new int[7];
        for (int j = 0; j < 7; j++) {
            int b = (int) (Math.random() * 10);
            a[j] = b;
        }
        for (int n : a) {
            sb3.append(n + ",");
        }

    }
}

xml文件：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/RelativeLayout1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.lixu.caipiao.MainActivity" >

    <EditText
        android:id="@+id/et1"
        android:layout_width="210dp"
        android:layout_height="50dp"
        android:hint="等待输入" 
        android:background="@drawable/round"/>

    <EditText
        android:id="@+id/et2"
        android:layout_width="210dp"
        android:layout_height="50dp"
        android:layout_below="@id/et1"
        android:hint="等待输入" 
        android:background="@drawable/round"
        />

    <EditText
        android:id="@+id/et3"
        android:layout_width="210dp"
        android:layout_height="50dp"
        android:layout_below="@id/et2"
        android:hint="等待输入" 
        android:background="@drawable/round"/>


    <Button
        android:id="@+id/btn1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:text="双色球机选" 
        android:background="@drawable/round"/>

    <Button
        android:id="@+id/btn2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@+id/et2"
        android:layout_alignBottom="@+id/et2"
        android:layout_alignParentRight="true"
        android:text="大乐透机选" 
        android:background="@drawable/round"/>

    <Button
        android:id="@+id/btn3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_below="@+id/btn2"
        android:text="七星彩机选" 
        android:background="@drawable/round"/>
</RelativeLayout>

运行效果图：