Android中通过pid获取app包名

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example :

    if(packageNames.length >1){
    int pid = Binder.getCallingPid();
    int uid = Binder.getCallingUid();
    ActivityManager am = (ActivityManager)mContext.getSystemService(mContext.ACTIVITY_SERVICE);
        List<ActivityManager.RunningAppProcessInfo> runningApps  = am.getRunningAppProcesses();
      if (runningApps != null && runningApps.size() > 0) {
        for (ActivityManager.RunningAppProcessInfo app : runningApps) {
        if(app.pid == pid && app.uid ==uid){
          packageNames[0] = app.processName;
        break;
     }
          }
      }
    }

网络上的案例：

String callerPackage = getAppNameByPID(getContext(), Binder.getCallingPid());

private String getAppName(int pID)
{
    String processName = "";
    ActivityManager am = (ActivityManager)this.getSystemService(ACTIVITY_SERVICE);
    List l = am.getRunningAppProcesses();
    Iterator i = l.iterator();
    PackageManager pm = this.getPackageManager();
    while(i.hasNext()) 
    {
          ActivityManager.RunningAppProcessInfo info = (ActivityManager.RunningAppProcessInfo)(i.next());
          try 
          { 
              if(info.pid == pID)
              {
                  CharSequence c = pm.getApplicationLabel(pm.getApplicationInfo(info.processName, PackageManager.GET_META_DATA));
                  //Log.d("Process", "Id: "+ info.pid +" ProcessName: "+ info.processName +"  Label: "+c.toString());
                  //processName = c.toString();
                  processName = info.processName;
              }
          }
          catch(Exception e) 
          {
                //Log.d("Process", "Error>> :"+ e.toString());
          }
   }
    return processName;
}

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ActivityManagerService.java

    @Override
    public List<ApplicationInfo> getRunningExternalApplications() {
        enforceNotIsolatedCaller("getRunningExternalApplications");
        List<ActivityManager.RunningAppProcessInfo> runningApps = getRunningAppProcesses();
        List<ApplicationInfo> retList = new ArrayList<ApplicationInfo>();
        if (runningApps != null && runningApps.size() > 0) {
            Set<String> extList = new HashSet<String>();
            for (ActivityManager.RunningAppProcessInfo app : runningApps) {
                if (app.pkgList != null) {
                    for (String pkg : app.pkgList) {
                        extList.add(pkg);
                    }
                }
            }

}