Retrieves whether Android installs an app

今天和大家分享如何判断手机上是否安装了XXX.apk。因为国外项目在打开地图的时候一定要使用gGoogle map，像这种打开第三方软件的，android都会采用Intent进行跳转，然后根据ＡＣＴＩＯＮ判断类型，弹出一个选项框。但是客户非要指定Google map，所以在跳转的时候就要进行筛选，其实就是根据APK的包名进行筛选以Google map 为例~Google map的包名为com.google.android.apps.maps，如果你想知道其他的，直接百度下就好了。值得注意的是，如果手机上没存在Google map，程序会崩溃。所以在做的时候得规避下这种错误，抛出一个Tomast。

if (Checkapkexist (Getactivity (),"Com.google.android.apps.maps") {Intent i = new Intent (Intent. ACTION_view, Uri. Parse("http://ditu.google.cn/maps?hl=zh&mrt=loc&q="+ (Double. Parsedouble(mlocation. Getlongitude())                                                            +","+ Double. Parsedouble(mlocation. Getlongitude()))));I. Addflags(Intent. FLAG_activity_new_task & Intent. FLAG_activity_exclude_from_recents);I. Setclassname("Com.google.android.apps.maps","Com.google.android.maps.MapsActivity");StartActivity (i);} else {Toast. Maketext(Getactivity (),"Please download Google map", Toast. LENGTH_long);}boolean checkapkexist (Context context, String PackageName) {if (PackageName = = NULL | |"". Equals(PackageName)) {return False;} try {context. Getpackagemanager(). Getapplicationinfo(PackageName, Packagemanager. GET_uninstalled_packages);return True;} catch (Namenotfoundexception e) {return false;}    }

Also attach the previous code to retrieve all APK:

final PackageManager packageManager = getActivity().getPackageManager();//获取packagemanager   List< PackageInfo> pinfo = packageManager.getInstalledPackages(0);//获取所有已安装程序的包信息       ifnull){       for(int0; i < pinfo.size(); i++){           String packName = pinfo.get(i).packageName;           Log.d("info""-->"+packName);      }   

Again when writing an article and think about whether to detect whether in the SD card, so I found a piece of code from the Internet:

privatevoidisInstallOnSd(Context context,String name){      PackageManager pm=context.getPackageManager();      ApplicationInfo appInfo;      try {          0);          if0) {                 // App on sdcard              Log.d("info""app on sd");          }      catch (NameNotFoundException e) {          e.printStackTrace();      }   }  

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Retrieves whether Android installs an app