Question

我试图显示屏幕上生成的随机数，但出于某种原因它不会出现在屏幕上看起来像

 _______
 1  2  3
 4  5  6
 7  8  9
del 0 # -

随机数将显示“ _ ”

的位置

main.xml

<TextView
        android:id="@+id/Title"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="15dp"
        android:text="  "
        android:textSize="45dp" />

question.Java

package org.example.question;

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

public class QuestionActivity extends Activity implements View.OnClickListener {
    /** Called when the activity is first created. */
    int fnum, snum;


Button one,two,three,four,five,six,seven,eight,nine,zero,minus,hash;
    TextView display;






    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);  


        display = (TextView)findViewById(R.id.Title);




        //Buttons

        one= (Button) findViewById(R.id.keypad_1);
        two= (Button) findViewById(R.id.keypad_2);
        three= (Button) findViewById(R.id.keypad_3);
        four= (Button) findViewById(R.id.keypad_4);
        five = (Button) findViewById(R.id.keypad_5);
        six= (Button) findViewById(R.id.keypad_6);
        seven = (Button) findViewById(R.id.keypad_7);
        eight = (Button) findViewById(R.id.keypad_8);
        nine = (Button) findViewById(R.id.keypad_9);
        minus = (Button) findViewById(R.id.keypad_subtract);
        hash = (Button) findViewById(R.id.keypad_hash);

        one.setOnClickListener(this);     two.setOnClickListener(this);     three.setOnClickListener(this); 
        three.setOnClickListener(this);   four.setOnClickListener(this);     five.setOnClickListener(this);
        six.setOnClickListener(this);     seven.setOnClickListener(this);     eight.setOnClickListener(this);
        nine.setOnClickListener(this);     minus.setOnClickListener(this);   hash.setOnClickListener(this);

}




    public void onClick(View arg0) {
        // TODO Auto-generated method stub
        display.setText("2+2");
    }




    public void requestFocus() {
        // TODO Auto-generated method stub

    }
}

帮助将非常感激

Answer 1

您可以使用java.util.Random类生成随机数。例如：

 Random r  = new Random();
    int randomInt = r.nextInt(10);

这将生成0到9范围内的随机数。您可以将此代码放在按钮的onClick（）中并将其设置为TextView。

如何在textView中显示屏幕上生成的随机数

1 个答案: