Android简单判断某个APK是否已经安装的方法

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

if(isAppInstalled("com.yourpackage.package")){//app installed}else{//app not installed}