检测当前手机正在运行的APP

import re #一定要引入，否则不提示错误，但找不到目标
def jiance(sjh):
    aakk="adb -s {0} shell dumpsys activity activities".format(sjh)
    aak="adb -s {0} shell am start -n com.kuaishou.nebula/com.yxcorp.gifshow.HomeActivity".format(sjh)
    zh=[]
    lx=[]
    ap=0
    p = subprocess.Popen(aakk, shell=True, stdout=subprocess.PIPE)
    out, err = p.communicate()
    time.sleep(4)
    #print(out.splitlines()[24:27])
    for line in out.splitlines():
        aa=line.decode("utf-8")
        #print(len(aa))
        try:
            ab=re.findall('cmp=com.(.*?)/',aa)
            #al=ab[0]+'.HomeActivity'
            if len(ab)>0:
                break
        except:
            continue
    try:
        aa=ab[0]
    except:
        ap=1
    if ap==0:
        if aa=="kuaishou.nebula":
            print("已经运行")
            pass
        else:
            process = subprocess.Popen(aak,shell=True)
            time.sleep(2)
            print("已经重新打开了")
    else:
        print("没有得到ab")

aakk="adb devices"
aakk="adb shell dumpsys window w |findstr \/ |findstr name="
aakk="adb shell dumpsys activity activities"

def jiance():
    zh=[]
    lx=[]
    p = subprocess.Popen(aakk, shell=True, stdout=subprocess.PIPE)
    out, err = p.communicate()
    #print(out.splitlines()[24:27])
    for line in out.splitlines():
        aa=line.decode("utf-8")
        #print(len(aa))
        try:
            ab=re.findall('cmp=com.(.*?)/',aa)
            #al=ab[0]+'.HomeActivity'
            if len(ab)>0:
                return ab[0]
                break
        except:
            print("没有")
aa=jiance()
print(aa)  
运行快手：

adb shell am start -n com.kuaishou.nebula/com.yxcorp.gifshow.HomeActivity
adb shell am start -n com.kuaishou.nebula/com.yxcorp.gifshow.activity.UriRouterActivity