package com.drillingsaru.io.sdcard;
//Java
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
//android
import android.os.Environment;
import android.util.Log;
public class BinaryFileIO
{
//Write binary data into a file
public void WriteData(String FileName, byte[] DataBuf)
{
if( !this.IsExternalStorageMounted() ) {
this.mErrNo = ERR_STORAGE_NOT_MOUNTED;
return;
}
try
{
//Get the path of root folder (Return = /mnt/sdcard )
File rootDir = Environment.getExternalStorageDirectory();
//Create a output stream object
FileOutputStream outStream = new FileOutputStream(new File(rootDir.getPath(), FileName));
//Write Data
outStream.write(DataBuf);
//Flush it
outStream.flush();
//Close self
outStream.close();
this.mErrNo = ERR_NONE;
}catch(Exception e){
Log.d("--WriteData--", e.getMessage());
}
}
}
using UnityEngine;
using System.Collections;
using System.Collections.Generic;
public class WriteData2SDCard : MonoBehaviour
{
#region Definition
/// <summary>
/// The package name and class name
/// package name = com.DrillingSaru.io.sdcard
/// </summary>
public readonly string PACKAGE_CLASS_NAME = "com.drillingsaru.io.sdcard.BinaryFileIO";
/// <summary>
/// Student information
/// </summary>
public class StudentInfo
{
public int Language = 0;
public int Math = 0;
public int Science = 0;
public StudentInfo(int lang, int math, int science)
{
this.Language = lang;
this.Math = math;
this.Science = science;
}
public StudentInfo(byte[] DataBuf)
{
this.Set(DataBuf);
}
//轉換成byte陣列
public byte[] GetBytes()
{
List<byte> RtnData = new List<byte>();
RtnData.AddRange(System.BitConverter.GetBytes(this.Language));
RtnData.AddRange(System.BitConverter.GetBytes(this.Math));
RtnData.AddRange(System.BitConverter.GetBytes(this.Science));
return RtnData.ToArray();
}
//轉換成結構資料
public void Set(byte[] DataBuf)
{
int Offset = sizeof(int);
int Shift = 0;
this.Language = System.BitConverter.ToInt32(DataBuf, Shift);
Shift += Offset;
this.Math = System.BitConverter.ToInt32(DataBuf, Shift);
Shift += Offset;
this.Science = System.BitConverter.ToInt32(DataBuf, Shift);
Shift += Offset;
}
}
#endregion
#region InputData
#endregion
#region DataMebmer
private StudentInfo mStudentInfo = new StudentInfo(500, 5, 10);
private AndroidJavaObject mDataWriter = null;
#endregion
#region MemberFunc
private void Init()
{
this.mDataWriter = new AndroidJavaObject(PACKAGE_CLASS_NAME);
}
/// <summary>
/// write binary data to file
/// </summary>
private void WriteData()
{
if( this.mDataWriter == null )
return;
//設定傳入參數
object[] args = new object[2];
args[0] = "testfile.bin";
args[1] = (object)this.mStudentInfo.GetBytes();
//呼叫函式
this.mDataWriter.Call("WriteData", args);
}
/// <summary>
/// read binary data from file
/// </summary>
private void ReadData_Test()
{
if( this.mDataWriter == null )
return;
byte[] RtnList = new byte[1024];
object[] args = new object[1];
args[0] = "testfile.bin";
RtnList = this.mDataWriter.Call("ReadData", args);
this.mStudentInfo.Set(RtnList);
}
#endregion
#region SystemFunc
void Awake()
{
this.Init();
}
// Use this for initialization
void OnEnable ()
{
this.WriteData();
}
void Update ()
{
}
#endregion
}
package com.calculator.numberincreasing;
public class NumberAdder
{
public int Add(int base, int factor)
{
return (base + factor);
}
}
package com.calculator.numberincreasing;
public class NumberMultipler
{
public int Multiple(int base, int rate)
{
return (base * rate);
}
}
public class Calculator : MonoBehaviour
{
private int Org = 10;
private int factor = 20;
private int Mutiple = 30;
private int Added = 0;
private int Mutiplier = 0;
private AndroidJavaObject mCal = null;
// Use this for initialization
void Start ()
{
//產生NumberAdder物件
this.mCal = new AndroidJavaObject("com.calculator.numberincreasing.NumberAdder");
//建立傳入參數陣列
object[] arglist = new object[2];
arglist[0] = (object)this.Org;
arglist[1] = (object)this.factor;
//呼叫方法，並取得回傳值
this.Added = this.mCal.Call<int>("Add", arglist);
this.mCal = new AndroidJavaObject("com.calculator.numberincreasing.NumberMultipler");
arglist[0] = (object)this.Org;
arglist[1] = (object)this.Mutiple;
this.Mutiplier = this.mCal.Call<int>("Multiple", arglist);
}
//輸出測試結果
void OnGUI()
{
GUI.Label(new Rect(100.0f, 100.0f, 100.0f, 50.0f), string.Format("Org = {0}\nAdded = {1}\nMultipled = {2}", this.Org, this.Added, this.Mutiplier));
}
}
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />前者為設定可讀寫的權限。是必備的。 後者是設定可掛載或是卸載可移除式儲存裝置。(如沒有加入這個權限，則在進行檔案操作時，會出現"Permission Denied"的錯誤訊息)。 A.之後在進行檔案寫入的動作時， 1.如果是要寫入二進位的資料，可用FileOutputStream.write()直接寫出檔案。
private void WriteData(String Data)
{
//Check the state of storage
if( !Environment.MEDIA_MOUNTED.equals((Environment.getExternalStorageState())) ) {
Log.d("WriteData", "--SDCard has been removed.--");
return;
}
try
{
//Get the path of root folder
File rootDir = Environment.getExternalStorageDirectory();
//Create a output stream object
FileOutputStream outStream = new FileOutputStream(new File(rootDir.getPath(), "IOTestFile.dat"));
//Write Data
byte[] buffer = new byte[BUFFER_SIZE];
buffer[0] = 0x30;
buffer[1] = 0x31;
buffer[2] = 0x32;
buffer[3] = 0x33;
buffer[4] = 0x34;
outStream.write(buffer, 0, 5);
//Flush it
outStream.flush();
//Close self
outStream.close();
}catch(Exception e){
Log.d("--WriteData--", e.getMessage());
}
}
要注意的是，使用FileOutputStream時，要把FileOutputStream放到try...catch()內。
Environment.getExternalStorageDirectory()可以取得到目前External storage所在的路徑。
2.如果是要寫入純文字檔，可用FileOutputStream與OutputStreamWriter.append()來將資料寫入檔案內。
private void WriteDataWithOutputStreamWriter()
{
try
{
String FuncName = "WriteDataWithOutputStreamWriter";
//Check the SDCard state
if(!Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState()))
{
Log.d("WriteDataWithOutputStreamWriter", "======== External SD Card not mounted ===========");
return;
}
//Get the path of the root folder
File rootDir = Environment.getExternalStorageDirectory();
//Create file object
File FileContent = new File(String.format("%s/%s/IOTestFile.dat", rootDir.getParent(), rootDir.getName()));
if(!FileContent.createNewFile())
{
Log.d(FuncName, "Cannot create file");
}
Log.d("WriteDataWithOutputStreamWriter", String.format("======= Target Path = %s ============", FileContent.getPath()));
//Create a output stream object
FileOutputStream outStream = new FileOutputStream(FileContent);
//Create a output stream writer
OutputStreamWriter streamWriter = new OutputStreamWriter(outStream);
//write data
streamWriter.append("lalalala");
//close writer
streamWriter.close();
//close output stream object
outStream.close();
}catch(Exception e){
Log.d("--WriteDataByOutputStreamWriter--", e.getMessage());
}
}
B.如果是要讀取檔案，則可以用：
1.讀取二進位檔的內容，則可用FileInputStream來取得資料即可。
private String ReadData()
{
try
{
//Get the path of root folder
File rootDir = Environment.getExternalStorageDirectory();
//Create a input Stream Object
FileInputStream inStream = new FileInputStream(new File(rootDir.getPath(), "IOTestFile.dat"));
//Load the data from target
byte[] buffer = new byte[BUFFER_SIZE];
int DataLen = inStream.read(buffer);
if(DataLen == -1)
{
Log.d("ReadData", "========= Reading Data has problem. ==================");
throw new IOException("Reading Data has problem.");
}
inStream.close();
//Show data
TextView text = (TextView)findViewById(R.id.editText1);
String OutText = "";
for(int i = 0 ; i < 5 ; i++)
{
Log.d("ReadData", String.format("--------- Data(%x) has been loaded from %s -------------", buffer[i], rootDir.getPath()));
OutText += String.format("%x", buffer[i]);
}
text.setText((CharSequence)OutText);
}catch(Exception e){
Log.d("--ReadData--", e.getMessage());
}
return "";
}
