Android 判断app是否安装

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);

}