Question

基本上我想这样做，

class myclass
{
    int a1;
    float b1;
    char c1;     //This is a single character
}
List<myclass> obs;

现在在运行时这个obs变量因为它是一个列表将包含myclass实例的数组其大小我们得到obs.size();

那么，如何将这些数据写入文件，将“data1.bin”称为二进制，使用OutputStream或类似的东西。但这要在Android OS中完成。

我在c ++中做了类似的事情，比如

class myclass
{
    int a1;
    float b1;
    char c1;
}

myclass student1;

ofstream output_file("students.data", ios::binary);
output_file.write((char*)&student1, sizeof(student1));
output_file.close()

但是如何在Android OS中执行此操作？

Answer 1

如果你想把你的类转储到文件，让类实现Serializable和java（或android上的Dalvik VM）将在幕后为你做这个。

class MyClass implements Serializable {

    private static final long serialVersionUID = 1L;

    int a1;
    float b1;
    char c1;     //This is a single character
}


private File file;
private MyClass myClass;

private void writeIt() throws IOException {

    ObjectOutputStream stream = null;
    try {
        stream = new ObjectOutputStream(new FileOutputStream(file));
        stream.writeObject(myClass);
    } 
    finally {
        if(stream != null) {
            stream.close();
        }
    }
}

private MyClass readIt() throws IOException, ClassNotFoundException {

    ObjectInputStream stream = null;
    try {
        stream = new ObjectInputStream(new FileInputStream(file));
        return (MyClass) stream.readObject();
    } 
    finally {
        if(stream != null) {
            stream.close();
        }
    }
}

在android中编写/读取结构/类数据

1 个答案: