protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ExitApplication.getInstance().addActivity(this); btnLogin=findViewById(R.id.btn_login); etAccount=findViewById(R.id.account_input); etPassword=findViewById(R.id.password_input); /**完成代码***/ } public void exit() { for (Activity act : activityList) { act.finish(); } System.exit(0); } @Override public void onClick(View v) { switch(v.getId()){ case R.id.btn_login: ExitApplication.getInstance().exit(); break; } } }
ExitApplication冒红有错误