Android -- 双击退出

实现android双击后退键退出当前APP功能

实现该功能基本思路是，

1， 监听后退键 ， 比较两次后退间隔 ， 低于两秒则出发退出

2， 退出当前APP 

我选择在基类中BaseActivity 中设置监听，代码如下：

@Override
    public void onBackPressed() {

        //Preferences 中获取是否双击退出
        boolean isDoubleClick = true;
        //BaseApplication.get("ifDoubleClickedBack", true);

        if (isDoubleClick) {
            long curTime = SystemClock.uptimeMillis();
            if ((curTime - mBackPressedTime) < (2 * 1000)) {
                finish();
                //activity栈管理
                AppManager.getAppManager().AppExit();
            } else {
                mBackPressedTime = curTime;
                Toast.makeText(this, "再次点击退出", Toast.LENGTH_SHORT).show();
            }
        } else {
            finish();
        }

    }

在退出当前APP中，参考开源中国，封装了activity栈

public class AppManager {
    private static Stack<Activity> activityStack;
    private static AppManager instance;

    private AppManager() {
    }

    /**
     * 单一实例
     */
    public static AppManager getAppManager() {
        if (instance == null) {
            instance = new AppManager();
        }

        if (activityStack == null) {
            activityStack = new Stack<Activity>();
        }

        return instance;
    }

    /**
     * 获取指定的Activity
     *
     * @author kymjs
     */
    public static Activity getActivity(Class<?> cls) {
        if (activityStack != null)
            for (Activity activity : activityStack) {
                if (activity.getClass().equals(cls)) {
                    return activity;
                }
            }
        return null;
    }

    /**
     * 添加Activity到堆栈
     */
    public void addActivity(Activity activity) {
        activityStack.add(activity);
    }

    /**
     * 获取当前Activity（堆栈中最后一个压入的）
     */
    public Activity currentActivity() {
        Activity activity = activityStack.lastElement();
        return activity;
    }

    /**
     * 结束当前Activity（堆栈中最后一个压入的）
     */
    public void finishActivity() {
        Activity activity = activityStack.lastElement();
        finishActivity(activity);
    }

    /**
     * 结束指定的Activity
     */
    public void finishActivity(Activity activity) {
        if (activity != null && activityStack.contains(activity)) {
            activityStack.remove(activity);
            activity.finish();
        }
    }

    /**
     * 结束指定的Activity
     */
    public void removeActivity(Activity activity) {
        if (activity != null && activityStack.contains(activity)) {
            activityStack.remove(activity);
        }
    }

    /**
     * 结束指定类名的Activity
     */
    public void finishActivity(Class<?> cls) {
        for (Activity activity : activityStack) {
            if (activity.getClass().equals(cls)) {
                finishActivity(activity);
                break;
            }
        }
    }

    /**
     * 结束所有Activity
     */
    public void finishAllActivity() {
        for (int i = 0, size = activityStack.size(); i < size; i++) {
            if (null != activityStack.get(i)) {
                finishActivity(activityStack.get(i));
            }
        }
        activityStack.clear();
    }

    /**
     * 退出应用程序
     */
    public void AppExit() {
        try {
            finishAllActivity();
            // System.exit(0);
        } catch (Exception e) {
        }
    }
}

思路就是在每次activity 压入activity栈中管理

在退出时遍历栈，挨个finish