Intent 可以传递数据
Intent intent = new
Intent(MainActivity.this,TwoActivity.class);
//在Intent对象当中添加一个键值对
intent.putExtra("key","value");
startActivity(intent);
在TwoActivity中获取值
Intent intent = getIntent();
//从Intent当中根据key取得value
if (intent != null) {
String value = intent.getStringExtra("key");
}