Android使用单例模式实现退出应用程序

来源：互联网发布：mindjet mac 编辑：程序博客网时间：2024/04/29 04:45

单例：对象只创建一个实例，并且提供一个全局的访问点。
思路：创建一个继承Activity的BaseActivity，其目的是所有启动的Activity都继承该BaseActivity，我们就可以通过BaseActivity向Activity栈里添加Activity，要退出整个应用，我们遍历整个Activity栈逐个退出即可。

public class ActivityCollector {    private static Stack<Activity> stackActivities;    private static ActivityCollector instance;    private ActivityCollector() {    }    /**     * 单一实例     */    public static ActivityCollector getActivityCollector() {        if (instance == null) {            instance = new ActivityCollector();        }        return instance;    }    /**     * 添加activity到堆栈     *      * @param activity     */    public void addActivity(Activity activity) {        if (stackActivities == null) {            stackActivities = new Stack<Activity>();        }        stackActivities.add(activity);    }    /**     * 结束当前Activity(最后一个压入的即是当前activity)     *      * @param activity     */    public void finishCurrentActivity() {        Activity activity = stackActivities.lastElement();        finishAssignActivity(activity);    }    /**     * 结束指定的Activity     */    public void finishAssignActivity(Activity activity) {        if (activity != null) {            stackActivities.remove(activity);            activity.finish();            activity = null;        }    }    /**     * 结束所有的activity     */    public void finishAllActivity() {        for (int i = 0, size = stackActivities.size(); i < size; i++) {            if (null != stackActivities.get(i)) {                stackActivities.get(i).finish();            }        }        stackActivities.clear();    }    /**     * 获取当前Activity（堆栈中最后一个压入的）     */    public Activity getCurrentActivity() {        Activity activity = stackActivities.lastElement();        return activity;    }    /**     * 结束指定类名的Activity     */    public void finishActivity(Class<?> cls) {        for (Activity activity : stackActivities) {            if (activity.getClass().equals(cls)) {                finishAssignActivity(activity);            }        }    }    /**     * 退出应用程序     */    public void AppExit(Context context) {        try {            finishAllActivity();            ActivityManager activityManager = (ActivityManager) context                    .getSystemService(Context.ACTIVITY_SERVICE);            activityManager.restartPackage(context.getPackageName());            System.exit(0);        } catch (Exception e) {            // TODO: handle exception        }    }}

每个启动的Activity都会执行BaseActivity的添加Activity栈的方法：

public class BaseActivity extends Activity implements OnClickListener {    @Override    protected void onCreate(Bundle savedInstanceState) {        // TODO Auto-generated method stub        super.onCreate(savedInstanceState);        // 把当前activity加入到栈中        ActivityCollector.getActivityCollector().addActivity(this);    }    @Override    public void onClick(View v) {        // TODO Auto-generated method stub    }}

0 0