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();
List<ApplicationInfo> applications = pm.getInstalledApplications(PackageManager.GET_META_DATA);
for (ApplicationInfo applicationInfo : applications) {try {PackageInfo packageInfo = packageManager.getPackageInfo(applicationInfo.packageName, PackageManager.GET_SIGNATURES);Signature[] signs = packageInfo.signatures;} catch (PackageManager.NameNotFoundException e) {e.printStackTrace();}
}

2: 获取SHA1

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 < digest.length; j++) {int v = digest[j] & 0xFF;hexChars[j * 2] = hexArray[v >>> 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.

创建mainacitity

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

acitivity布局如下:

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:app="http://schemas.android.com/apk/res-auto"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"tools:context=".MainActivity"><GridViewandroid:layout_width="match_parent"android:layout_height="match_parent"android:numColumns="1"app:layout_constraintStart_toStartOf="parent"app:layout_constraintTop_toTopOf="parent"android:id="@+id/grid_sign"/>
</androidx.constraintlayout.widget.ConstraintLayout>

ApkAdapter代码如下:

public class ApkAdapter extends BaseAdapter {private List<ApplicationInfo> list;private Context context;private PackageManager packageManager;public ApkAdapter(List<ApplicationInfo> list, Context context) {this.list = list;this.context = context;packageManager = context.getPackageManager();}@Overridepublic int getCount() {return list.size();}@Overridepublic Object getItem(int position) {return list.get(position);}@Overridepublic long getItemId(int position) {return position;}@Overridepublic 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;}
}

以及item的布局:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayoutxmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"android:layout_height="100dp"><ImageViewandroid:layout_width="80dp"android:layout_height="80dp"android:id="@+id/item_icon"android:layout_margin="10dp"/><RelativeLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content"android:layout_toRightOf="@+id/item_icon"android:layout_marginTop="10dp"android:layout_marginRight="10dp"><TextViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:textSize="16sp"android:text="xxx"android:layout_alignParentTop="true"android:textColor="@color/black"android:id="@+id/item_name"/><TextViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:textColor="#ff0000"android:textSize="14sp"android:layout_alignParentBottom="true"android:layout_marginBottom="10dp"android:text="xxxxxxxxx"android:id="@+id/item_sign"/></RelativeLayout></RelativeLayout>

最后展示下效果图: