Android利用Serializable保存自定义数据至本地

孤风一剑 1月 08, 2014 324 0

MainActivity如下:

[java] view plaincopy

package cc.test.serializable;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.ArrayList;
import android.app.Activity;
import android.os.Bundle;
import android.os.Environment;
/**
* Demo描述:
* 将ArrayList<自定义数据>在SDCard上进行存取.
*
* Parcelable和Serializable的区别:
* 内存间数据传输时推荐使用Parcelable,如activity间传输数据
* 比如:http://blog.csdn.net/lfdfhl/article/details/10961459
* 保存到本地或者网络传输时推荐使用Serializable
*/
public class TestSerializableActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
testSerializable();
}
private void testSerializable() {
FileOutputStream fileOutputStream=null;
ObjectOutputStream objectOutputStream =null;
FileInputStream fileInputStream = null;
ObjectInputStream objectInputStream = null;
ArrayList<Student> studentsArrayList = new ArrayList<Student>();
Student student = null;
for (int i = 1; i < 5; i++) {
student = new Student(i, “小明” + i);
studentsArrayList.add(student);
}
try {
//存入数据
File file = new File(Environment.getExternalStorageDirectory().toString()
+ File.separator +”Test”+File.separator + “data.dat”);
if (!file.getParentFile().exists()) {
file.getParentFile().mkdirs();
}
if (!file.exists()) {
file.createNewFile();
}
fileOutputStream= new FileOutputStream(file.toString());
objectOutputStream= new ObjectOutputStream(fileOutputStream);
objectOutputStream.writeObject(studentsArrayList);
//取出数据
fileInputStream = new FileInputStream(file.toString());
objectInputStream = new ObjectInputStream(fileInputStream);
ArrayList<Student> savedArrayList =(ArrayList<Student>) objectInputStream.readObject();
for (int i = 0; i < savedArrayList.size(); i++) {
System.out.println(“取出的数据:” + savedArrayList.get(i).toString());
}
} catch (Exception e) {
// TODO: handle exception
}finally{
if (objectOutputStream!=null) {
try {
objectOutputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (fileOutputStream!=null) {
try {
fileOutputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (objectInputStream!=null) {
try {
objectInputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (fileInputStream!=null) {
try {
fileInputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}

Student如下:

[java] view plaincopy

package cc.test.serializable;
import java.io.Serializable;
public class Student implements Serializable {
private Integer id;
private String name;
//注意定义此字段
public static final long serialVersionUID = 9527L;
public Student() {
super();
}
public Student(Integer id, String name) {
super();
this.id = id;
this.name = name;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public String toString() {
return “Student [id=” + id + “, name=” + name + “]”;
}
}

main.xml如下:

[html] view plaincopy

<?xml version=”1.0″ encoding=”utf-8″?>
<LinearLayout xmlns:android=”http://schemas.android.com/apk/res/android”
android:layout_width=”fill_parent”
android:layout_height=”fill_parent”
android:orientation=”vertical” >
<TextView
android:layout_width=”fill_parent”
android:layout_height=”wrap_content”
android:text=”@string/hello” />
</LinearLayout>

Android利用Serializable保存自定义数据至本地

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