检测用户是否安装某个第三方应用

/**
* Created by y on 2016/2/26.
*/
public class IsApkUtils {

public static boolean isApk(Context context, String packageName) {
final PackageManager packageManager = context.getPackageManager();
List<PackageInfo> pinfo = packageManager.getInstalledPackages(0);
if (pinfo != null) {
for (int i = 0; i < pinfo.size(); i++) {
String pn = pinfo.get(i).packageName;
if (pn.equals(packageName)) {
return true;
}
}
}
return false;
}
}