Android开发之Activity管理工具类完整示例

package com.maobang.imsdk.util;
import java.util.Stack;
import android.app.Activity;
import android.app.ActivityManager;
import android.content.Context;
import android.graphics.drawable.Drawable;
import android.view.View;
import android.view.ViewGroup;
import android.webkit.WebView;
import android.widget.ImageView;
import android.widget.ListView;
/**
 * Activity管理类
 * Created by Administrator on 2016/11/24.
 */
public class ActivityPageManager {
  private static Stack activityStack;
  private static ActivityPageManager instance;
  /**
   * constructor
   */
  private ActivityPageManager() {
  }
  /**
   * get the AppManager instance, the AppManager is singleton.
   */
  public static ActivityPageManager getInstance() {
    if (instance == null) {
      instance = new ActivityPageManager();
    }
    return instance;
  }
  /**
   * add Activity to Stack
   */
  public void addActivity(Activity activity) {
    if (activityStack == null) {
      activityStack = new Stack();
    }
    activityStack.add(activity);
  }
  /**
   * remove Activity from Stack
   */
  public void removeActivity(Activity activity) {
    if (activityStack == null) {
      activityStack = new Stack();
    }
    activityStack.remove(activity);
  }
  /**
   * get current activity from Stack
   */
  public Activity currentActivity() {
    Activity activity = activityStack.lastElement();
    return activity;
  }
  /**
   * finish current activity from Stack
   */
  public void finishActivity() {
    Activity activity = activityStack.lastElement();
    finishActivity(activity);
  }
  /**
   * finish the Activity
   */
  public void finishActivity(Activity activity) {
    if (activity != null) {
      activityStack.remove(activity);
      activity.finish();
      activity = null;
    }
  }
  /**
   * finish the Activity
   */
  public void finishActivity(Class<&＃63;> cls) {
    for (Activity activity : activityStack) {
      if (activity.getClass().equals(cls)) {
        finishActivity(activity);
      }
    }
  }
  /**
   * finish all Activity
   */
  public void finishAllActivity() {
    if(activityStack!=null&&activityStack.size()>0)
    {
      for (int i = 0, size = activityStack.size(); i