Android随机数

Android随机数

java文件

package com.example.my_xm_bw_luowei;

import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;

import java.util.Random;

public class MainActivity extends AppCompatActivity {
    
    

    private Button bt1;
    private EditText et1;
    private EditText et2;
    private TextView tv;
    private int i=0;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
    
    
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        bt1 = (Button) findViewById(R.id.bt1);
        et2 = (EditText) findViewById(R.id.et2);
        tv = (TextView) findViewById(R.id.tv);
        bt1.setOnClickListener(new View.OnClickListener() {
    
    
            @Override
            public void onClick(View v) {
    
    
                i++;
                String trim2 = et2.getText().toString().trim();
                String s = "";
                Random ran =new Random(System.currentTimeMillis());
                Log.d("aaa", "onClick: "+i);
                for (int i = 0 ; i <1; i++) {
    
    
                    s = s + "\n" + ran.nextInt(Integer.parseInt(trim2));
                }
                tv.setText(s+"");
                if (i==10){
    
    
                    tv.setText("直接让高金玉上 嘻嘻嘻");
                }
            }
        });
    }

}

xml文件

<?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"
    tools:context=".MainActivity"
    android:orientation="vertical"
    >

    <Button
        android:text="高金玉"
        android:id="@+id/bt1"
        android:background="#ffffff"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"></Button>
    <EditText
        android:id="@+id/et2"
        android:hint="0-n"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"></EditText>
    <TextView
        android:textColor="#DD0D0D"
        android:textSize="50dp"
        android:id="@+id/tv"
        android:text="0"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"></TextView>
</LinearLayout>

效果图片