Android append 文本文件

Question

我正在尝试将对话选择器中的唤醒时间和 sleep 时间记录到这样的文本文件中，但是对方法 commitToFile2 的调用不会 append 文本文件“savedData.txt”。

我知道这段代码很脏。我是 Java 新手，因此我们将不胜感激任何其他建议。

package com.buttinyourface;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStreamWriter;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.app.TimePickerDialog;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.TimePicker;
import android.widget.AdapterView.OnItemClickListener;

public class SettingsActivity extends Activity {

    public int wakeHour;
    public int wakeMinute;
    public int sleepHour;
    public int sleepMinute;
    public String sleepHourText = "No Data";
    public String sleepMinuteText = "No Data";
    public String outputTime = "No Data";
    public String wakeHourText = "No Data";
    private ListView lv;
    Dialog newDialogBox;
    Context appContext;
    protected Context context;
    static final private int WAKE_TIME = 0;
    static final private int SLEEP_TIME = 1;

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.settings);
        final String[] settingsList = getResources().getStringArray(
                R.array.settingsStringArray);
        lv = (ListView) findViewById(R.id.list);
        TextView wakeHourTextView = (TextView) findViewById(R.id.TextView01);
        lv.setOnItemClickListener(new OnItemClickListener() {

            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {
                int settingsPosition = position;
                if (settingsPosition == 0) {
                    showDialog(WAKE_TIME);
                    wakeHourText = Integer.toString(wakeHour);
                }
                if (settingsPosition == 1) {
                    showDialog(SLEEP_TIME);
                }
            }
        });
        lv.setAdapter(new ArrayAdapter<String>(this,
                android.R.layout.simple_list_item_1, settingsList));
        wakeHourTextView.setText(outputTime);
    }

    public void onPrepareDialog(int id, Dialog dialog) {
        switch (id) {
        case WAKE_TIME:
            break;
        case SLEEP_TIME:
            break;
        }
    }

    @Override
    public Dialog onCreateDialog(int id) {
        switch (id) {
        case WAKE_TIME:
            return new TimePickerDialog(this, WakeTimeSetListener, wakeHour,
                    wakeMinute, false);
        case SLEEP_TIME:
            return new TimePickerDialog(this, SleepTimeSetListener, sleepHour,
                    sleepMinute, false);
        }
        return null;
    }

    private TimePickerDialog.OnTimeSetListener WakeTimeSetListener =
                          new TimePickerDialog.OnTimeSetListener() {
        public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
            wakeHour = hourOfDay;
            wakeMinute = minute;
            String wakeHourText = Integer.toString(hourOfDay);
            String wakeMinuteText = Integer.toString(minute);
            String preftime = hourOfDay + ":" + minute;
            SimpleDateFormat df = new SimpleDateFormat("HH:mm");
            SimpleDateFormat dfOut = new SimpleDateFormat("hh:mma");
            Date date = null;
            try {
                date = df.parse(preftime);
            } catch (ParseException e1) {
                // TODO Auto-generated catch block
                e1.printStackTrace();
            }
            String outputWakeTime = dfOut.format(date);
            try {
                commitToFile(wakeHourText, wakeMinuteText, outputWakeTime);
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    };
    private TimePickerDialog.OnTimeSetListener SleepTimeSetListener =
                          new TimePickerDialog.OnTimeSetListener() {
        public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
            sleepHour = hourOfDay;
            sleepMinute = minute;
            String sleepHourText = Integer.toString(hourOfDay);
            String sleepMinuteText = Integer.toString(minute);
            String preftime = hourOfDay + ":" + minute;
            SimpleDateFormat df = new SimpleDateFormat("HH:mm");
            SimpleDateFormat dfOut = new SimpleDateFormat("hh:mma");
            Date date = null;
            try {
                date = df.parse(preftime);
            } catch (ParseException e1) {
                // TODO Auto-generated catch block
                e1.printStackTrace();
            }
            String sleepOutputTime = dfOut.format(date);
            try {
                commitToFile2(sleepHourText, sleepMinuteText, sleepOutputTime);
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    };

    private void commitToFile(String wakeHourText, String wakeMinuteText,
            String outputWakeTime) throws IOException {
        final String entryString = new String("wakeHour=" + wakeHourText
                + ";wakeMinute=" + wakeMinuteText + ";wakeTime="
                + outputWakeTime + ";");
        FileOutputStream fOut = openFileOutput("savedData.txt",
                MODE_WORLD_READABLE);
        OutputStreamWriter osw = new OutputStreamWriter(fOut);
        osw.write(entryString);
        osw.flush();
        osw.close();
    }

    private void commitToFile2(String sleepHourText, String sleepMinuteText,
            String sleepOutputTime) throws IOException {
        final String entryString = new String("sleepHour=" + sleepHourText
                + ";sleepMinute=" + sleepMinuteText + ";sleepTime="
                + sleepOutputTime + ";");
        FileOutputStream fOut = openFileOutput("savedData.txt",
                MODE_WORLD_READABLE);
        OutputStreamWriter osw = new OutputStreamWriter(fOut);
        osw.write(entryString);
        osw.flush();
        osw.close();
    }
}

Answer 1

我想通了....我不得不换行

FileOutputStream fOut = openFileOutput("savedData.txt", MODE_WORLD_READABLE);

到

FileOutputStream fOut = openFileOutput("savedData.txt",  MODE_APPEND);

之后，我能够在不覆盖文本文件中已经存在的数据的情况下 append 文本文件。谢谢你们的帮助。我想有时去谷歌的第四页很有用。