检查或遍历android手机应程

检查android手机中是否存在某应程

public boolean checkApp(String packageName) {
        if (packageName == null || "".equals(packageName))
            return false;
        try {
            ApplicationInfo info = getPackageManager().getApplicationInfo(packageName, PackageManager.GET_UNINSTALLED_PACKAGES);
            return true;
        } catch (NameNotFoundException e) {
            return false;
        }
    }

遍历android手机中的所有应用

private void foreachSoft() {

　　PackageManager packageMgr = getPackageManager();

　　List<PackageInfo> list = packageMgr.getInstalledPackages(0);

　　for (int i = 0; i < list.size(); i++) {

　　　　PackageInfo info = list.get(i);

　　　　String temp = info.packageName;

　　　　Log.i("lyf", temp);

　　 }

}