java - SerializeObject.WriteSettings 在哪里写入文件？ (小路)

Question

我在手机上找不到该文件。我想要一个桌面应用程序，可以读取我用手机保存的文件(加速度计数据)，并且因为我对 Android 开发非常陌生，所以我决定最简单的方法就是在文件系统中找到它，然后打开通过以下方式将其放在我的桌面上:

 SerializeObject.ReadSettings(this, "activityLibrary.dat");

我通过以下方式将文件保存在我的应用程序中:

 SerializeObject.WriteSettings(this, ser, "activityLibrary.dat");

我尝试使用 ES Explorer 应用程序搜索文件系统，但它没有找到我的文件。也尝试过 Windows 搜索。有人可以帮忙吗？或者建议一种不同的、简单易懂的方式在我的手机和桌面之间移动此文件？

编辑:

我使用此类进行对象序列化:

import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStreamWriter;
import java.io.Serializable;

import android.content.Context;
import android.util.Base64InputStream;
import android.util.Base64OutputStream;
import android.util.Log;

/**
 * Take an object and serialize and then save it to preferences
 * @author John Matthews
 *
 */
public class SerializeObject {
private final static String TAG = "SerializeObject";

/**
 * Create a String from the Object using Base64 encoding
 * @param object - any Object that is Serializable
 * @return - Base64 encoded string.
 */
public static String objectToString(Serializable object) {
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    try {
        new ObjectOutputStream(out).writeObject(object);
        byte[] data = out.toByteArray();
        out.close();

        out = new ByteArrayOutputStream();
        Base64OutputStream b64 = new Base64OutputStream(out,0);
        b64.write(data);
        b64.close();
        out.close();

        return new String(out.toByteArray());
    } catch (IOException e) {
        e.printStackTrace();
    }
    return null;
}

/**
 * Creates a generic object that needs to be cast to its proper object
 * from a Base64 ecoded string.
 * 
 * @param encodedObject
 * @return
 */
public static Object stringToObject(String encodedObject) {
    try {
        return new ObjectInputStream(new Base64InputStream(
                new ByteArrayInputStream(encodedObject.getBytes()), 0)).readObject();
    } catch (Exception e) {
        e.printStackTrace();
    }
    return null;
}

/**
 * Save serialized settings to a file
 * @param context
 * @param data
 */
public static void WriteSettings(Context context, String data, String filename){ 
    FileOutputStream fOut = null; 
    OutputStreamWriter osw = null;

    try{
        fOut = context.openFileOutput(filename, Context.MODE_PRIVATE);       
        osw = new OutputStreamWriter(fOut); 
        osw.write(data); 
        osw.flush(); 
        //Toast.makeText(context, "Settings saved",Toast.LENGTH_SHORT).show();
    } catch (Exception e) {       
        e.printStackTrace(); 
       // Toast.makeText(context, "Settings not saved",Toast.LENGTH_SHORT).show();
    } 
    finally { 
        try { 
            if(osw!=null)
                osw.close();
            if (fOut != null)
                fOut.close(); 
        } catch (IOException e) { 
               e.printStackTrace(); 
        } 
    } 
}

/**
 * Read data from file and put it into a string
 * @param context
 * @param filename - fully qualified string name
 * @return
 */
public static String ReadSettings(Context context, String filename){ 
    StringBuffer dataBuffer = new StringBuffer();
    try{
        // open the file for reading
        InputStream instream = context.openFileInput(filename);
        // if file the available for reading
        if (instream != null) {
            // prepare the file for reading
            InputStreamReader inputreader = new InputStreamReader(instream);
            BufferedReader buffreader = new BufferedReader(inputreader);

            String newLine;
            // read every line of the file into the line-variable, on line at the time
            while (( newLine = buffreader.readLine()) != null) {
                // do something with the settings from the file
                dataBuffer.append(newLine);
            }
            // close the file again
            instream.close();
        }

    } catch (java.io.FileNotFoundException f) {
        // do something if the myfilename.txt does not exits
        Log.e(TAG, "FileNot Found in ReadSettings filename = " + filename);
        try {
            context.openFileOutput(filename, Context.MODE_PRIVATE);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
    } catch (IOException e) {
        Log.e(TAG, "IO Error in ReadSettings filename = " + filename);
    }

    return dataBuffer.toString();
}

}

Answer 1

openFileOutput 将文件保存在 /data/data/your.package.name/files/ 目录中。

使用Context.getExternalFilesDir或Environment.getExternalStorageDirectory轻松访问文件以复制到计算机或邮寄给自己。