为什么我的代码没有写入文件？

Question

我试图在 activity 启动时从文本文件中读取一个整数。在我的日志中，我只看到

调试：尝试读取高分文件

永远不会

调试：读取高分文件

或

调试：无法读取高分文件

为什么我的文件是由 writeHighScore 文件创建的，但没有写入任何值。

public class GameScreen extends AppCompatActivity implements View.OnClickListener {

private Simon simon = new Simon();;
private int score = 0;
private int highScore = 0;
private String highScoreString;
private String FILENAME = "highscore.txt";

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

    //Read highScore file
    TextView highScoreTV = (TextView) findViewById(R.id.high_score_tv);

    Log.i("DEBUG", "Attempt to read High Score File");

    try{
        FileInputStream fis = openFileInput(FILENAME);
        Scanner scanner = new Scanner(fis);
        if(scanner.hasNext()){
            Log.i("DEBUG", "Reading High Score File");
            highScoreString = scanner.nextLine();
            highScore = Integer.getInteger(highScoreString);
        }
        scanner.close();
    } catch (FileNotFoundException e){
        Log.e("READ ERROR", "Could not read high score: " + e.getMessage());
    }
    highScoreTV.setText(""+highScore);
}

writeHighScore

private void writeHighScore(){
        try {
            FileOutputStream fos = openFileOutput(FILENAME, Context.MODE_PRIVATE);
            OutputStreamWriter osw = new OutputStreamWriter(fos);
            BufferedWriter bw = new BufferedWriter(osw);
            PrintWriter pw = new PrintWriter(bw);
            Log.i("DEBUG", "Writing High Score File");
            pw.println("" + score + "\n");
        } catch (FileNotFoundException e) {
            Log.e("WRITE ERROR", "Cannot Save: " + e.getMessage());
            e.printStackTrace();
            Toast.makeText(GameScreen.this, "Error Saving", Toast.LENGTH_SHORT).show();
        }
    }

Answer 1

我认为问题是您忘记关闭打印器，因此 reader 无法打开文件。

只需向您的 writeHighScore 方法添加结束语句即可解决问题。

为什么我的代码没有写入文件？

Why is my code not writing to file?

java

android

file

file-io

fileinputstream