那麼我們要怎麼來實現Activity的管理呢?
大家都知道,Android系統有自己的Activity管理機制,也就是 Activity Stack(棧)。奉行着 先進後出,後進先出的原則。那麼我們就通過Stack來進行Activity的管理。
第一步,肯定是創建 Stack<Activity>集合。然後根據Stack<Activity>集合的方法進行操作。
實現包括:添加Activity到堆棧、獲取當前的Activity(堆棧最後一個)、結束當前的Activity(堆棧最後一個)、結束指定的Activity、結束指定類名的Activity、結束所有的Activity等方法。
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/**
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* Activity管理類
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*
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*/
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public class AppManager {
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/** 堆棧管理對象 */ private static final ActivityStack STACK = new ActivityStack(); /** 當前顯示的Activity */ private static WeakReference<Activity> topActivity; /** 額外操作 */ private static ExtraOperations operations;
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private static Stack<Activity> activityStack;
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private static AppManager instance;
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private AppManager() {
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}
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/**
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* 單一實例
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*/
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public static AppManager getAppManager() {
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if (instance == null) {
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instance = new AppManager();
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}
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return instance;
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}
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/** * 從堆棧中刪除指定對象 */ public boolean removeFromStack(Activity activity) { for (WeakReference<Activity> weak : activityStack) { final Activity act = weak.get(); if (act == activity) { return activityStack.remove(weak); } } return false; } /**
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* 獲取當前顯示的activity */ public static Activity peek() { if (null != topActivity && null != topActivity.get()) { return topActivity.get(); } else { return STACK.peekFromStack(); } }
/** * 退出APP */ public static void onExit() { final long now = System.currentTimeMillis(); if (now <= lastExitPressedMills + MAX_DOUBLE_EXIT_MILLS) { BqsDF.destroy(); finishAll(); if (null != operations) { operations.onExit(); } System.exit(0); } else { if (null != peek()) { ToastUtil.toast(R.string.app_exit); } lastExitPressedMills = now; } }
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/**
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* 添加Activity到堆棧
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*/
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public void addActivity(Activity activity) {
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if (activityStack == null) {
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activityStack = new Stack<Activity>();
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}
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activityStack.add(activity);
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}
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/**
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* 獲取當前Activity(堆棧中最後一個壓入的)
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*/
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public Activity currentActivity() {
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Activity activity = activityStack.lastElement();
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return activity;
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}
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/**
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* 結束當前Activity(堆棧中最後一個壓入的)
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*/
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public void finishActivity() {
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Activity activity = activityStack.lastElement();
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finishActivity(activity);
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}
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/**
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* 結束指定的Activity
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*/
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public void finishActivity(Activity activity) {
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if (activity != null) {
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activityStack.remove(activity);
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activity.finish();
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activity = null;
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}
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}
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/**
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* 結束指定類名的Activity
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*/
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public void finishActivity(Class<?> cls) {
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for (Activity activity : activityStack) {
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if (activity.getClass().equals(cls)) {
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finishActivity(activity);
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}
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}
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}
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/**
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* 結束所有Activity
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*/
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public void finishAllActivity() {
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for (int i = 0, size = activityStack.size(); i < size; i++) {
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if (null != activityStack.get(i)) {
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activityStack.get(i).finish();
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}
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}
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activityStack.clear();
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}
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/**
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* 退出應用程序
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*/
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@SuppressWarnings("deprecation")
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public void AppExit(Context context) {
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try {
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finishAllActivity();
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ActivityManager activityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
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activityManager.restartPackage(context.getPackageName());
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System.exit(0);
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} catch (Exception e) {
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e.printStackTrace();
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}
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}
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public interface ExtraOperations { /** APP退出時需要額外處理的事情,例如廣播的反註冊,服務的解綁 */ void onExit(); /** activity 銷燬時需要額外處理的事情,例如finish動畫等 */ void onActivityFinish(Activity activity); }
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}