Android 實現雙擊退出的功能

實現android雙擊後退鍵退出當前APP功能

實現該功能基本思路是，

1， 監聽後退鍵 ， 比較兩次後退間隔 ， 低於兩秒則出發退出

2， 退出當前APP

我選擇在基類中BaseActivity 中設置監聽，代碼如下：

 public void onBackPressed() {

    //Preferences 中獲取是否雙擊退出
    boolean isDoubleClick = true;
    //BaseApplication.get("ifDoubleClickedBack", true);

    if (isDoubleClick) {
      long curTime = SystemClock.uptimeMillis();
      if ((curTime - mBackPressedTime) < (2 * 1000)) {
        finish();
        //activity棧管理
        AppManager.getAppManager().AppExit();
      } else {
        mBackPressedTime = curTime;
        Toast.makeText(this, "再次點擊退出", Toast.LENGTH_SHORT).show();
      }
    } else {
      finish();
    }

  }

在退出當前APP中，參考開源中國，封裝了activity棧

實例代碼：

public class AppManager {
  private static Stack<Activity> activityStack;
  private static AppManager instance;

  private AppManager() {
  }

  /**
   * 單一實例
   */
  public static AppManager getAppManager() {
    if (instance == null) {
      instance = new AppManager();
    }

    if (activityStack == null) {
      activityStack = new Stack<Activity>();
    }

    return instance;
  }

  /**
   * 獲取指定的Activity
   *
   * @author kymjs
   */
  public static Activity getActivity(Class<?> cls) {
    if (activityStack != null)
      for (Activity activity : activityStack) {
        if (activity.getClass().equals(cls)) {
          return activity;
        }
      }
    return null;
  }

  /**
   * 添加Activity到堆棧
   */
  public void addActivity(Activity activity) {
    activityStack.add(activity);
  }

  /**
   * 獲取當前Activity（堆棧中最後一個壓入的）
   */
  public Activity currentActivity() {
    Activity activity = activityStack.lastElement();
    return activity;
  }

  /**
   * 結束當前Activity（堆棧中最後一個壓入的）
   */
  public void finishActivity() {
    Activity activity = activityStack.lastElement();
    finishActivity(activity);
  }

  /**
   * 結束指定的Activity
   */
  public void finishActivity(Activity activity) {
    if (activity != null && activityStack.contains(activity)) {
      activityStack.remove(activity);
      activity.finish();
    }
  }

  /**
   * 結束指定的Activity
   */
  public void removeActivity(Activity activity) {
    if (activity != null && activityStack.contains(activity)) {
      activityStack.remove(activity);
    }
  }

  /**
   * 結束指定類名的Activity
   */
  public void finishActivity(Class<?> cls) {
    for (Activity activity : activityStack) {
      if (activity.getClass().equals(cls)) {
        finishActivity(activity);
        break;
      }
    }
  }

  /**
   * 結束所有Activity
   */
  public void finishAllActivity() {
    for (int i = 0, size = activityStack.size(); i < size; i++) {
      if (null != activityStack.get(i)) {
        finishActivity(activityStack.get(i));
      }
    }
    activityStack.clear();
  }

  /**
   * 退出應用程序
   */
  public void AppExit() {
    try {
      finishAllActivity();
      // System.exit(0);
    } catch (Exception e) {
    }
  }
}

思路就是在每次activity 壓入activity棧中管理

在退出時遍歷棧，挨個finish

希望本文所述對大家的Android程序設計有所幫助。