Android 判斷app是否安裝

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1.

private boolean isAppInstalled(Context context, String uri) {          PackageManager pm = context.getPackageManager();          boolean installed = false;          try {              pm.getPackageInfo(uri, PackageManager.GET_ACTIVITIES);              installed = true;          } catch (PackageManager.NameNotFoundException e) {              installed = false;          }          return installed;      }  

2.

public boolean isAppInstalled(Context context, String packageName) {          final PackageManager packageManager = context.getPackageManager();          List<PackageInfo> pinfo = packageManager.getInstalledPackages(0);          List<String> pName = new ArrayList<String>();          if (pinfo != null) {              for (int i = 0; i < pinfo.size(); i++) {                  String pn = pinfo.get(i).packageName;                  pName.add(pn);              }          }          return pName.contains(packageName);      }  

例子： 

                 if (isInstallApp(MainActivity.this, "com.xxx")) {                      System.out.println("Installed!!");                  } else {                      System.out.println("Not installed!!");                  }      

 

Android 判斷app是否安裝