项目需要将服务器下拉的数据(ArrayList对象类型)保存到本地SD卡中。此时就是java对象序列化和反序列化的应用了。

写了一个简单的小例子：

先点击序列化按钮，

再点击反序列化按钮 ，如果反序列化成功，将显示值出来。

public class TestProgress extends Activity {

Button  but1,but2;

TextView  tv1,tv2;

int count=0;

private static String mSDCARD = null;

ArrayList>arrayList;

ArrayList

Object>>arrayList2;

@Override

public

void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

but1=(Button)findViewById(R.id.but1);

but2=(Button)findViewById(R.id.but2);

tv1=(TextView)findViewById(R.id.tv1);

tv2=(TextView)findViewById(R.id.tv2);

arrayList=new

ArrayList>();

HashMap

Object>map=new HashMap

Object>();

map.put("id", "1");

map.put("name", "xuliehua");

HashMap

Object>map1=new HashMap

Object>();

map1.put("id", "2");

map1.put("name", "fanxuliehua");

arrayList.add(map);

arrayList.add(map1);

String

filenameString=getHcExternalFile("ddddd","/object"+".obj");

final File file =new File(filenameString);

but1.setOnClickListener(new

View.OnClickListener(){

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

//序列化

try {

FileOutputStream fis=new FileOutputStream(file);

ObjectOutputStream ois=new ObjectOutputStream(fis);

ois.writeObject(arrayList);

ois.close();

fis.close();

} catch (FileNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (StreamCorruptedExceptione) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}});

but2.setOnClickListener(new

View.OnClickListener(){

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

try {

FileInputStream fis=new FileInputStream(file);

ObjectInputStream ois =new ObjectInputStream(fis);

arrayList2=(ArrayList

Object>>)= ois.readObject();

ois.close();

fis.close();

if(arrayList2!=null){

tv2.setText(arrayList2.get(0).get("name").toString());

}

} catch (FileNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (StreamCorruptedExceptione) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (ClassNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}});

}

public static String

getHcExternalFile(String subFolder, String fileName) {

try {

String subFolderPath = getSDCardPath() + "/handcent/"

+ subFolder + "/";

File fi = new File(subFolderPath);

if (!fi.exists()) {

fi.mkdirs();

}

return fi.getAbsolutePath() + fileName;

} catch (Exception exp) {

exp.printStackTrace();

return null;

}

}

public static String

getSDCardPath() {

if (mSDCARD == null) {

mSDCARD =

Environment.getExternalStorageDirectory().toString();

if (mSDCARD == null) {

mSDCARD = "/sdcard";

}

}

return mSDCARD;

}

}