Android向下一个活动传递数据

String data = "Hello";
                Intent intent = new Intent(MainActivity.this,SecondActivity.class);
                intent.putExtra("data",data);
                startActivity(intent);

String data = getIntent().getStringExtra("data");
        Toast.makeText(this, ""+data, Toast.LENGTH_SHORT).show();

如果用intent传递对象
就把对应的Bean类implements Serializable

Person person = new Person();
.....
intent.putExtra("person",person);

Person person = (Person) getIntent().getSerializableExtra("person");

还有一种Parcelable方法,比较复杂,但效率高