1.RandomDateUtil类代码
public class RandomDateUtil {
public static int DATA(){
//int
int min=1;
int max=100;
Random random = new Random();
return random.nextInt(max)%(max-min+1) + min;
}
public static String DATA2(){
//String
int min=1;
int max=100;
Random random = new Random();
int num = random.nextInt(max)%(max-min+1) + min;
return String.valueOf(num);
}
}
2.布局文件
一个按钮,每次点击获取随机数
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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">
<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="100dp"
android:text="随机数获取"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
3.java代码
public class MainActivity extends AppCompatActivity {
Button mButton;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mButton=findViewById(R.id.button);
mButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mButton.setText(RandomDateUtil.DATA2());
}
});
}
}
运行