java - 在 Android Studio 上测试时尝试读取文件时，应用程序会关闭

Question

所以我一直在开发一个应用程序，它可以告诉你随机谈论的话题。我尝试读入文件并显示带有文件上随机主题的文本。我执行此操作的代码在这里:

package com.example.nosir;

import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.List;
import android.util.Log;
import java.util.Random;



public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    public static final String TAG = MainActivity.class.getSimpleName();
    public static final String mPath = "example.txt";
    private QuoteBank mQuoteBank;
    private List<String> mLines;
    Random random = new Random();

    TextView text1;
    String theTopic;


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

        Button button1 = findViewById(R.id.button1);
        button1.setOnClickListener(this);
        text1 = (TextView) findViewById(R.id.text1);

        mQuoteBank = new QuoteBank(this);
        mLines = mQuoteBank.readLine(mPath);
        for (String string : mLines)
            Log.d(TAG, string);

    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.button1:
                text1.setText(mLines.get(random.nextInt(mLines.size())));
                break;
            default:

                break;
        }
    }


}

package com.example.nosir;

import android.content.Context;
import android.content.res.AssetManager;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.List;
import java.util.ArrayList;

public class QuoteBank {

    private Context mContext;

    public QuoteBank(Context context) {
        this.mContext = context;
    }

    public List<String> readLine(String path) {
        List<String> mLines = new ArrayList<>();

        AssetManager am = mContext.getAssets();

        try {
            InputStream is = am.open(path);
            BufferedReader reader = new BufferedReader(new InputStreamReader(is));
            String line;

            while ((line = reader.readLine()) != null)
                mLines.add(line);
        } catch (IOException e) {
            e.printStackTrace();
        }

        return mLines;
    }
}

但是当我按下按钮显示随机文本时，我的应用程序只是关闭并且不执行任何操作。我正在 OnePlus6 上进行测试。我实在不知道出了什么问题。我希望有人能帮助我。提前致谢。

Answer 1

感谢您的快速回复。我找到了一种自己完成的方法，它比旧代码更短、更好。这是代码，如果有人感兴趣的话:

public  class MainActivity extends AppCompatActivity   {

    Button b_read;
    TextView tv_text;


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

        b_read = (Button) findViewById(R.id.b_read);

        tv_text = (TextView) findViewById(R.id.tv_text);

        b_read.setOnClickListener(new View.OnClickListener(){

            public void onClick(View view) {
                String text = "";
                String words[] = null;
                int x = (int) (Math.random()*1556 + 1);
                try{
                    InputStream is = getAssets().open("Themen.txt");
                    int size = is.available();
                    byte[] buffer = new byte[size];
                    is.read(buffer);
                    is.close();
                    text = new String(buffer);
                    Pattern pattern = Pattern.compile("\n");
                    words = pattern.split(text);
                } catch (IOException ex){
                    ex.printStackTrace();
                }
                tv_text.setText(words[x]);
            }

        });


    }


}