android销毁Activity和被系统销毁时的数据保存

//定义map,保存启动的 activityspublic class ActHelper {    private static HashMap map = new HashMap();    public static void addActivity(Activity activity) {        map.put(activity.getClass().getSimpleName(), activity);    }    public static void removeActivity(Activity activity) {        map.remove(activity.getClass().getSimpleName());    }    public static void finishAll() {        for (String key : map.keySet()) {            Activity activity = map.get(key);            if (!activity.isFinishing()) {                activity.finish();            }        }    }    public static void finishThis(Class clas) {        String str = clas.getSimpleName();        if (map.containsKey(str)) {            Activity activity = map.get(str);            if (!activity.isFinishing()) {                activity.finish();            }        }    }    public static void finishExcept(Class... clas) {        for (int i = 0; i < clas.length; i++) {            String str = clas[i].getSimpleName();            if (map.containsKey(str)) {                map.remove(str);            }        }        finishAll();    }}

系统内存不足时，会主动销毁activity

//onRestoreInstanceState()会在onStart()和onResume()之间执行或者在oncreat方法中判断    //只有在activity销毁重建的时候,才会调用    @Override    protected void onRestoreInstanceState(Bundle savedInstanceState) {        super.onRestoreInstanceState(savedInstanceState);    }    // 会在 onStop()方法调用之前 调用该方法,保存当前状态    //当用户主动销毁activity，如按back键，或直接执行finish(),不会执行    //遇到意外情况（内存不足，用户直接按home键）由系统直接销毁一个Activity时，就会调用    @Override    public void onSaveInstanceState(Bundle outState, PersistableBundle outPersistentState) {        super.onSaveInstanceState(outState, outPersistentState);    }

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