Android 获取应用签名

Android 获取应用签名

本文主要讲下在android中如何获取应用签名. 也方便平时用来区分一个应用是不是原包应用.

1: 通过PackageManager获取签名信息

首先,通过packageManager获取到指定应用的PackageInfo. 这里需要传入的flag是PackageManager.GET_SIGNATURES

/**

• {@link PackageInfo} flag: return information about the
• signatures included in the package.
• @deprecated use {@code GET_SIGNING_CERTIFICATES} instead

  */

  @Deprecated

  public static final int GET_SIGNATURES = 0x00000040;

  PackageManager pm = getPackageManager();

  //获取已安装应用程序的信息，包括应用程序的包名、图标、名称等元数据。

  List applications = pm.getInstalledApplications(PackageManager.GET_META_DATA);

  for (ApplicationInfo applicationInfo : applications) {

  try {

  //获取指定应用程序的包信息，其中包括应用程序的签名信息

  PackageInfo packageInfo = packageManager.getPackageInfo(applicationInfo.packageName, PackageManager.GET_SIGNATURES);

  Signature[] signs = packageInfo.signatures;

  } catch (PackageManager.NameNotFoundException e) {

  e.printStackTrace();

  }

  }

  2: 获取SHA1

  下面是封装的utils方法，用于根据packageInfo.signatures来获取apk的sha1值。

  public class ShaUtils {    public static String getSHA1(byte[] sig) {        final char[] hexArray = "0123456789ABCDEF".toCharArray();        try {            MessageDigest md = MessageDigest.getInstance("SHA1");            byte[] digest = md.digest(sig);            char[] hexChars = new char[digest.length * 2];            for (int j = 0; j >> 4];                hexChars[j * 2 + 1] = hexArray[v & 0x0F];            }            return new String(hexChars);        } catch (Throwable e) {            e.printStackTrace();        }        return "";    }}

  下面是整理的一个小demo,展示当前设备的应用列表以及应用签名,包名,icon信息.

  3：demo

  创建mainacitity，主要用GridView展示获取到的应用列表。

  public class MainActivity extends AppCompatActivity {    private GridView gridView;    private ApkAdapter apkAdapter;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        gridView = findViewById(R.id.grid_sign);        PackageManager packageManager = getPackageManager();        List installedApplications = packageManager.getInstalledApplications(PackageManager.GET_META_DATA);        apkAdapter = new ApkAdapter(installedApplications, this);        gridView.setAdapter(apkAdapter);    }}

  acitivity布局如下:

  ApkAdapter代码如下:

  public class ApkAdapter extends BaseAdapter {    private List list;    private Context context;    private PackageManager packageManager;    public ApkAdapter(List list, Context context) {        this.list = list;        this.context = context;        packageManager = context.getPackageManager();    }    @Override    public int getCount() {        return list.size();    }    @Override    public Object getItem(int position) {        return list.get(position);    }    @Override    public long getItemId(int position) {        return position;    }    @Override    public View getView(int position, View view, ViewGroup parent) {        if (view == null) {            view = LayoutInflater.from(context).inflate(R.layout.item_apk, parent, false);        }        ApplicationInfo applicationInfo = list.get(position);        ImageView icon = (ImageView) view.findViewById(R.id.item_icon);        icon.setImageDrawable(applicationInfo.loadIcon(packageManager));        TextView label = (TextView) view.findViewById(R.id.item_name);        label.setText(applicationInfo.packageName);        TextView sign = (TextView) view.findViewById(R.id.item_sign);        StringBuilder stringBuilder = new StringBuilder();        try {            PackageInfo packageInfo = packageManager.getPackageInfo(applicationInfo.packageName, PackageManager.GET_SIGNATURES);            Signature[] signs = packageInfo.signatures;            for (Signature sig : signs) {                String sha1 = ShaUtils.getSHA1(sig.toByteArray());                stringBuilder.append("Signature: "+sha1+"\n");                Log.d("Signature", "packageName = " + packageInfo.packageName + ", signature = " + sha1);            }            sign.setText(stringBuilder.toString());        } catch (Throwable e) {            Log.e("Signature", "getView: ", e);        }        return view;    }}

  getPackageInfo根据包名返回PackageInfo 对象packageInfo.signatures获取签名applicationInfo.loadIcon用于获取应用图标applicationInfo.packageName获取应用包名

  applicationInfo的其他属性还有:

  1. packageName：应用程序的包名。
  2. className：应用程序的主Activity类名。
  3. processName：应用程序的进程名。
  4. sourceDir：应用程序的APK文件路径。
  5. dataDir：应用程序的数据目录路径。
  6. targetSdkVersion：应用程序的目标SDK版本。
  7. uid：应用程序的用户ID。
  8. flags：应用程序的标志位，如FLAG_SYSTEM表示系统应用。
  9. enabled：应用程序是否启用。
  10. metaData：应用程序的元数据，可以在AndroidManifest.xml中定义。

  以及item的布局:

  最后展示下效果图: