每日总结

1.今天开始学习Intent之复杂数据的传递

Intent传递数组 bd.putStringArray（"StringArray"）

读取数组：String[] str = bd.getStringArray("StringArray")

Intent传递集合

写入集合：

intent.putStringArrayListExtra(name, value)
intent.putIntegerArrayListExtra(name, value)

读取集合：

intent.getStringArrayListExtra(name)
intent.getIntegerArrayListExtra(name)

将对象转换为Json字符串

Model:

public class Book{
    private int id;
    private String title;
    //...
}

public class Author{
    private int id;
    private String name;
    //...
}

写入数据：

Book book=new Book();
book.setTitle("Java编程思想");
Author author=new Author();
author.setId(1);
author.setName("Bruce Eckel");
book.setAuthor(author);
Intent intent=new Intent(this,SecondActivity.class);
intent.putExtra("book",new Gson().toJson(book));
startActivity(intent);

读取数据：

String bookJson=getIntent().getStringExtra("book");
Book book=new Gson().fromJson(bookJson,Book.class);
Log.d(TAG,"book title->"+book.getTitle());
Log.d(TAG,"book author name->"+book.getAuthor().getName());