startActivityForResult is deprecated，registerForActivityResult的使用（java)

	private ActivityResultLauncher launcher;
	@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate( savedInstanceState );
        setContentView( R.layout.activity_main );
		initLaunch();
	}
	private void initLaunch() {
        launcher = registerForActivityResult( new ActivityResultContracts.StartActivityForResult(), new ActivityResultCallback() {
                    @Override
                    public void onActivityResult(ActivityResult result) {
						//Todo
                    }
                });
    }
    @Override
    public void onClick(View v) {
        Intent intent;
        switch (v.getId()) {
            case R.id.avatar:
                intent = new Intent( MainActivity.this, UserInfoActivity.class );
                launcher.launch( intent );
                break;
        }

launcher 要在onCreate内初始化，否则会闪退，之后调用launch方法即可
官方文档点此