判断某个app是否安装

/**

* 判断APP是否安装

*

* @param context

* @param packageName

* @return 如果已经安装，返回true;否则返回false

*/

public static boolean isAppInstalled(Context context, String packageName) {

PackageManager pm = context.getPackageManager();

boolean installed = false;

try {

pm.getPackageInfo(packageName, PackageManager.GET_ACTIVITIES);

installed = true;

} catch (PackageManager.NameNotFoundException e) {

installed = false;

}

return installed;

}