Android 实现双击退出的功能

2019-12-12 05:52:40

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实现android双击后退键退出当前APP功能

实现该功能基本思路是，

1，监听后退键，比较两次后退间隔，低于两秒则出发退出

2，退出当前APP

我选择在基类中BaseActivity 中设置监听，代码如下：

 public void onBackPressed() {    //Preferences 中获取是否双击退出    boolean isDoubleClick = true;    //BaseApplication.get("ifDoubleClickedBack", true);    if (isDoubleClick) {      long curTime = SystemClock.uptimeMillis();      if ((curTime - mBackPressedTime) < (2 * 1000)) {        finish();        //activity栈管理        AppManager.getAppManager().AppExit();      } else {        mBackPressedTime = curTime;        Toast.makeText(this, "再次点击退出", Toast.LENGTH_SHORT).show();      }    } else {      finish();    }  }

在退出当前APP中，参考开源中国，封装了activity栈

实例代码：

public class AppManager {  private static Stack<Activity> activityStack;  private static AppManager instance;  private AppManager() {  }  /**   * 单一实例   */  public static AppManager getAppManager() {    if (instance == null) {      instance = new AppManager();    }    if (activityStack == null) {      activityStack = new Stack<Activity>();    }    return instance;  }  /**   * 获取指定的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到堆栈   */  public void addActivity(Activity activity) {    activityStack.add(activity);  }  /**   * 获取当前Activity（堆栈中最后一个压入的）   */  public Activity currentActivity() {    Activity activity = activityStack.lastElement();    return activity;  }  /**   * 结束当前Activity（堆栈中最后一个压入的）   */  public void finishActivity() {    Activity activity = activityStack.lastElement();    finishActivity(activity);  }  /**   * 结束指定的Activity   */  public void finishActivity(Activity activity) {    if (activity != null && activityStack.contains(activity)) {      activityStack.remove(activity);      activity.finish();    }  }  /**   * 结束指定的Activity   */  public void removeActivity(Activity activity) {    if (activity != null && activityStack.contains(activity)) {      activityStack.remove(activity);    }  }  /**   * 结束指定类名的Activity   */  public void finishActivity(Class<?> cls) {    for (Activity activity : activityStack) {      if (activity.getClass().equals(cls)) {        finishActivity(activity);        break;      }    }  }  /**   * 结束所有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();  }  /**   * 退出应用程序   */  public void AppExit() {    try {      finishAllActivity();      // System.exit(0);    } catch (Exception e) {    }  }}

思路就是在每次activity 压入activity栈中管理

在退出时遍历栈，挨个finish

希望本文所述对大家的Android程序设计有所帮助。

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