android 清除所有activity

android中清除所有activity的需求，还是在蛮多场景出现的，最近项目中有遇到，把解决方法贴出来，也标记下～
首先自定义一个ActivityManager管理类，用于管理栈中的activity

public class ActivityManager {    private static final String TAG = "ActivityManager";    private static Stack activityStack;    private static ActivityManager instance;    private Activity currActivity;    private ActivityManager() {    }    public static ActivityManager getActivityManager() {        if (instance == null) {            instance = new ActivityManager();        }        return instance;    }    //退出栈顶Activity     public void popActivity(Activity activity) {          if(activity == null || activityStack == null) {            return;        }        if(activityStack.contains(activity)) {            activityStack.remove(activity);         }        currActivity = activity;        //activity.finish();           //activity = null;    }    public void destoryActivity(Activity activity) {        if(activity == null ) {            return;        }        activity.finish();        if(activityStack.contains(activity)) {            activityStack.remove(activity);         }        activity = null;        ZLog.d(TAG, "destoryActivity=================");    }    //获得当前栈顶Activity    public Activity currentActivity() {        if(activityStack == null ||activityStack.empty()) {            return null;        }        return activityStack.lastElement();    }    //将当前Activity推入栈中     public void pushActivity(Activity activity) {         if (activityStack == null) {            activityStack = new Stack();           }        activityStack.add(activity);       }    //退出栈中除指定的Activity外的所有       public void popAllActivityExceptOne(Class cls) {         while (true) {             Activity activity = currentActivity();              if (activity == null) {                  break;             }             if (activity.getClass().equals(cls)) {                  break;              }             destoryActivity(activity);         }    }    //退出栈中所有Activity    public void popAllActivity() {        popAllActivityExceptOne(null);    }    public Activity getCurrentActivity()    {        return currActivity;    }    public int getActivityStackSize()    {        int size = 0;        if (activityStack != null)        {            size = activityStack.size();        }        return size;    }}

然后，在你的baseActivity中的两个方法添加如下方法(如果没有baseActivity,就得一个个加了)

@Overrideprotected void onPause() {    super.onPause();    ActivityManager.getActivityManager().pushActivity(this);}@Overrideprotected void onResume() {    super.onResume();    ActivityManager.getActivityManager().popActivity(this);}

最后，根据需求判断，在需要清除所有activity的地方，加上如下代码，我的是在baseActivity的onResume()方法中添加的

if(isRestart){          ActivityManager.getActivityManager().popAllActivity();    Intent intent = new Intent(this,LoadingActivity.class);    intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);    startActivity(intent);    isRestart = false;    this.finish();}

注意：清楚掉所有activity后，startActivity时需要给它加上Intent.FLAG_ACTIVITY_CLEAR_TOP，表示start的这个activity置顶，并二次清除掉所有这个activity之上的activity

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