使用Serializable将数据发送到其他Intent

Data user;

if(getIntent() != null && getIntent().getExtras() != null){
    user = (data) getIntent().getExtras().getSerializable(MainActivity.data_key);
}

static String data_key;

myintent=new Intent(MainActivity.this, SecondActivity.class);
myintent.putExtra(data_key, user); //user class should implement serializable.
startActivity(myintent);