Android中使用Activity管理类

我的简书：简书

在日常的APP开发中，为了对APP中所有的Activity进行管理，所以统一放在Stack中处理。

• 创建AppManager：

public class AppManager {    public static Stack<Activity> getActivityStack() {        return activityStack;    }    private static Stack<Activity> activityStack;    private static AppManager instance;    private AppManager() {    }    /**     * 单一实例     */    public static AppManager getInstance() {        if (instance == null) {            instance = new AppManager();        }        return instance;    }    /**     * 添加Activity到堆栈     */    public void addActivity(Activity activity) {        if (activityStack == null) {            activityStack = new Stack<>();        }        activityStack.add(activity);    }    /**     * 获取栈顶Activity（堆栈中最后一个压入的）     */    public Activity getTopActivity() {        return activityStack.lastElement();    }    /**     * 结束栈顶Activity（堆栈中最后一个压入的）     */    public void finishTopActivity() {        Activity activity = activityStack.lastElement();        finishActivity(activity);    }    /**     * 结束指定类名的Activity     *     * @param cls     */    public void finishActivity(Class<?> cls) {        Iterator iterator = activityStack.iterator();        while (iterator.hasNext()) {            Activity activity = (Activity) iterator.next();            if (activity.getClass().equals(cls)) {                iterator.remove();                activity.finish();            }        }    }    /**     * 结束所有Activity     */    @SuppressWarnings("WeakerAccess")    public void finishAllActivity() {        for (int i = 0, size = activityStack.size(); i < size; i++) {            if (null != activityStack.get(i)) {                activityStack.get(i).finish();            }        }        activityStack.clear();    }    /**     * 退出应用程序     */    public void appExit() {        try {            finishAllActivity();            System.exit(0);            android.os.Process.killProcess(android.os.Process.myPid());        } catch (Exception e) {        }    }    /**     * 结束指定的Activity     */    public void finishActivity(Activity activity) {        if (activity != null) {            activityStack.remove(activity);            activity.finish();            activity = null;        }    }    /**     * 得到指定类名的Activity     */    public Activity getActivity(Class<?> cls) {        for (Activity activity : activityStack) {            if (activity.getClass().equals(cls)) {                return activity;            }        }        return null;    }}

• 使用：为了进行统一处理，我们可以写在BaseActivity中：

    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_base);        AppManager.getInstance().addActivity(this); //添加到栈中    }    @Override    protected void onDestroy() {        super.onDestroy();        AppManager.getInstance().finishActivity(this); //从栈中移除    }