@Overridepublic boolean onKeyDown(int keyCode, KeyEvent event) {if (keyCode == KeyEvent.KEYCODE_BACK && event.getAction() == KeyEvent.ACTION_DOWN) {if ((System.currentTimeMillis() - exitTime) > 2000) {showToast("再按一次退出程序");exitTime = System.currentTimeMillis();} else {ExitAPPUtils.exit();}return true;}return super.onKeyDown(keyCode, event);}public class ExitAPP {private static List<Activity> activityList = new LinkedList<Activity>();// 添加Activity到容器中public static void addActivity(Activity activity) {activityList.add(activity);}// 移除Activity从容器中public static void removeActivity(Activity activity) {activityList.remove(activity);}// 遍历所有Activity并finishpublic static void exit() {for (Activity activity : activityList) {if (!activity.isFinishing()) {activity.finish();}}System.exit(0);}
}以上是我之前用的一种退出app的方法，但是后来我在项目中用了新的方法：
private long exitTime;@Overridepublic boolean onKeyDown(int keyCode, KeyEvent event) {if (keyCode == KeyEvent.KEYCODE_BACK && event.getAction() == KeyEvent.ACTION_DOWN) {if ((System.currentTimeMillis() - exitTime) > 2000) {ToastUtils.showToast("再按一次退出程序");exitTime = System.currentTimeMillis();} else {stopEveryThing();}return true;}return super.onKeyDown(keyCode, event);}然后我在stopEveryThing里面做了判断，判断是否当前有自己的服务再运行，如果有的话就关闭服务。
private void stopEveryThing() {if (“判断服务是否正在运行”) {stopService();finish();new Handler().postDelayed(() -> System.exit(0), 1000);} else {finish();System.exit(0);}}
public boolean judgeServiceIsRunnung() {ActivityManager manager = (ActivityManager) getSystemService(ACTIVITY_SERVICE);for (ActivityManager.RunningServiceInfo service : manager.getRunningServices(Integer.MAX_VALUE)) {if ("服务的全类名，比如ye.da.shen.voice.worktask.scanService".equals(service.service.getClassName())) {return true;}}return false;}