Android:如何通过按钮单击另一个活动来传递一个活动的数据

Button button = findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        Intent intent = new Intent(FirstActivity.this, SecondActivity.class);
        intent.putExtra("key", "value");
        startActivity(intent);
    }
});

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_second);

    Intent intent = getIntent();
    String value = intent.getStringExtra("key");
}