Android 全局Dialog的简单实现方法

/** * Activity管理类 * @author Donkor */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();    }    return instance;  }  /**   * 添加Activity到堆栈   */  public void addActivity(Activity activity){    if(activityStack==null){      activityStack=new Stack<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();    if(activity!=null){      activity.finish();      activity=null;    }  }  /**   * 结束指定的Activity   */  public void finishActivity(Activity activity){    if(activity!=null){      activityStack.remove(activity);      activity.finish();      activity=null;    }  }  /**   * 结束指定类名的Activity   */  public void finishActivity(Class<?> cls){    for (Activity activity : activityStack) {      if(activity.getClass().equals(cls) ){        finishActivity(activity);      }    }  }  /**   * 结束所有Activity   */  public void finishAllActivity(){    for (int i = 0, size = activityStack.size(); i < size; i++){      if (null != activityStack.get(i)){        activityStack.get(i).finish();      }    }    activityStack.clear();  }  /**   * 退出应用程序   */  public void AppExit(Context context) {    try {      finishAllActivity();      ActivityManager activityMgr= (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);      activityMgr.restartPackage(context.getPackageName());      System.exit(0);    } catch (Exception e) {       e.printStackTrace();    }  }}

/** * Activity基类 * @author Donkor */public abstract class BaseActivity extends AppCompatActivity {  @Override  protected void onCreate(@Nullable Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    //将Activity实例添加到AppManager的堆栈    AppManager.getAppManager().addActivity(this);  }  @Override  protected void onDestroy() {    super.onDestroy();    //将Activity实例从AppManager的堆栈中移除    AppManager.getAppManager().finishActivity(this);  }}