Android Activity回收与操作超时处理

public class ActivityCollector {  private static List<Activity> activityList = new ArrayList<Activity>();  public static void addActivity(Activity activity){    activityList.add(activity);  }  public static void removeActivity(Activity activity){    activityList.remove(activity);  }  public static void finishAllButLast(){    Activity activity = activityList.get(activityList.size()-1);    removeActivity(activity);    for (Activity activityItem: activityList){      if (!activityItem.isFinishing()){        activityItem.finish();      }    }    activityList.clear();    activityList.add(activity);  }  public static void finishAll(){    for (Activity activity: activityList){      if (!activity.isFinishing()){        activity.finish();      }    }    activityList.clear();  }}

public class BaseActivity extends Activity {  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    ActivityCollector.addActivity(this);  }  @Override  protected void onDestroy() {    super.onDestroy();    ActivityCollector.removeActivity(this);  }}

abstract public class TimeOutCheckActivity extends BaseActivity {  private boolean isLeave = false;  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    pref = getSharedPreferences(Constant.CONFIG_NAME, Context.MODE_PRIVATE);  }  /**   * 回调函数，方便测试   * @return  */  abstract protected String getTag();  ......省略号......  /***   * 当用户使程序恢复为前台显示时执行onResume()方法,在其中判断是否超时.   */  @Override  protected void onResume() {//    Log.i("Back",getTag() + "，onResume，是否在前台：" + isOnForeground());    super.onResume();    if (isLeave) {      isLeave = false;      timeOutCheck();    }  }  @Override   protected void onStop() {    super.onStop();    if (!isOnForeground()){      if (!isLeave && isOpenALP()) {        isLeave = true;        saveStartTime();      }    }  }  public void timeOutCheck() {    long endtime = System.currentTimeMillis();    if (endtime - getStartTime() >= Constant.TIMEOUT_ALP * 1000) {      Util.toast(this, "超时了,请重新验证");      String alp = pref.getString(Constant.ALP, null);      if (alp == null || alp == "") {      } else {        Intent intent = new Intent(this, UnlockGesturePasswordActivity.class);        intent.putExtra("pattern", alp);        intent.putExtra("login",false); //手势验证，不进行登录验证        intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);        // 打开新的Activity        startActivityForResult(intent, Constant.REQ_COMPARE_PATTERN_TIMEOUT_CHECK);      }    }  }  public void saveStartTime() {    pref.edit().putLong(Constant.START_TIME, System.currentTimeMillis()).commit();  }  public long getStartTime() {    long startTime = 0;    try {      startTime = pref.getLong(Constant.START_TIME, 0);    }catch (Exception e){      startTime = 0;    }    return startTime;  }  /**   * 程序是否在前端运行,通过枚举运行的app实现。防止重复超时检测多次,保证只有一个activity进入超时检测   *当用户按home键时，程序进入后端运行，此时会返回false，其他情况引起activity的stop函数的调用，会返回true   * @return  */  public boolean isOnForeground() {    ActivityManager activityManager = (ActivityManager) getApplicationContext().getSystemService(Context.ACTIVITY_SERVICE);    String packageName = getApplicationContext().getPackageName();    List<ActivityManager.RunningAppProcessInfo> appProcesses = activityManager.getRunningAppProcesses();    if (appProcesses == null)      return false;    for (ActivityManager.RunningAppProcessInfo appProcess : appProcesses) {      if (appProcess.processName.equals(packageName)          && appProcess.importance == ActivityManager.RunningAppProcessInfo.IMPORTANCE_FOREGROUND) {         return true;      }    }    return false;  }}

public static final int IMPORTANCE_BACKGROUND = 400//后台 public static final int IMPORTANCE_EMPTY = 500//空进程 public static final int IMPORTANCE_FOREGROUND = 100//在屏幕最前端、可获取到焦点 可理解为Activity生命周期的OnResume(); public static final int IMPORTANCE_SERVICE = 300//在服务中 public static final int IMPORTANCE_VISIBLE = 200//在屏幕前端、获取不到焦点可理解为Activity生命周期的OnStart();