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java未知类“名称”

我是Android Studio的新手,正在努力适应它。我曾尝试制作一个简单的应用程序,用户可以按下一个按钮,然后生成一个随机数。然而,当我在代码中使用变量时,它给了我“未知类'get'”和“未知类'random'”错误。代码如下:

package com.example.myapplication;

import 安卓.support.v7.app.AppCompatActivity;
import 安卓.os.Bundle;
import 安卓.widget.Button;
import 安卓.widget.SeekBar;
import 安卓.widget.TextView;

import java.util.Random;


public class MainActivity extends AppCompatActivity {

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

        final Button RollButton = findViewById(id.RollButton);
        final TextView resultsTextView = findViewById(id.ResultsTV);
        final SeekBar seekBar = findViewById(id.seekBar);

        RollButton.setOnClickListener(new onClickListener()
        {
            Random rnd = new Random(10);
            private int random = rnd.nextInt(seekBar.getProgress());
            CharSequence get = resultsTextView.getText();
            get = String.valueOf(random);
        });
    }
}

共 (1) 个答案

  1. # 1 楼答案

    你的OnClickListener看起来不对,在这种情况下不能使用private。所以试试这个:

    public class MainActivity extends AppCompatActivity {
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    
        final Button RollButton = findViewById(id.RollButton);
        final TextView resultsTextView = findViewById(id.ResultsTV);
        final SeekBar seekBar = findViewById(id.seekBar);
    
        RollButton.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    Random rnd = new Random(10);
                    int random = rnd.nextInt(seekBar.getProgress());
                    CharSequence get = resultsTextView.getText();
                    get = String.valueOf(random);
                }
            });
    }
    }