<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="org.jssec.android.activity.inhouseactivity" >

    <!-- *** POINT 1 *** Define an in-house signature permission -->
    <permission
        android:name="org.jssec.android.activity.inhouseactivity.MY_PERMISSION"
        android:protectionLevel="signature" />

    <application
        android:allowBackup="false"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >

        <!-- In-house Activity -->
        <!-- *** POINT 2 *** Do not specify taskAffinity -->
        <!-- *** POINT 3 *** Do not specify launchMode -->
        <!-- *** POINT 4 *** Require the in-house signature permission -->
        <!-- *** POINT 5 *** Do not define the intent filter and explicitly set the exported attribute to
true -->
        <activity
            android:name="org.jssec.android.activity.inhouseactivity.InhouseActivity"
            android:exported="true"
            android:permission="org.jssec.android.activity.inhouseactivity.MY_PERMISSION" />
    </application>
</manifest>

package org.jssec.android.activity.inhouseactivity;

import org.jssec.android.shared.SigPerm;
import org.jssec.android.shared.Utils;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;

public class InhouseActivity extends Activity {

    // In-house Signature Permission
    private static final String MY_PERMISSION = "org.jssec.android.activity.inhouseactivity.MY_PERMISSION";
    // In-house certificate hash value
    private static String sMyCertHash = null;

    private static String myCertHash(Context context) {
        if (sMyCertHash == null) {
            if (Utils.isDebuggable(context)) {
                // Certificate hash value of "androiddebugkey" in the debug.keystore.
                sMyCertHash = "0EFB7236 328348A9 89718BAD DF57F544 D5CCB4AE B9DB34BC 1E29DD26 F77C8255";
            } else {
                // Certificate hash value of "my company key" in the keystore.
                sMyCertHash = "D397D343 A5CBC10F 4EDDEB7C A10062DE 5690984F 1FB9E88B D7B3A7C2 42E142CA";
            }
        }
        return sMyCertHash;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        // *** POINT 6 *** Verify that the in-house signature permission is defined by an in-house application.
        if (!SigPerm.test(this, MY_PERMISSION, myCertHash(this))) {
            Toast.makeText(this, "The in-house signature permission is not declared by in-house application.",
            Toast.LENGTH_LONG).show();
            finish();
            return;
        }

        // *** POINT 7 *** Handle the received intent carefully and securely, even though the intent was sent from an in-house application.
        // Omitted, since this is a sample. Please refer to "3.2 Handling Input Data Carefully and Securely."
        String param = getIntent().getStringExtra("PARAM");
        Toast.makeText(this, String.format("Received param: ¥"%s¥"", param), Toast.LENGTH_LONG).show();
    }

    public void onReturnResultClick(View view) {
        // *** POINT 8 *** Sensitive information can be returned since the requesting application is inhouse.
        Intent intent = new Intent();
        intent.putExtra("RESULT", "Sensitive Info");
        setResult(RESULT_OK, intent);
        finish();
    }
}

package org.jssec.android.activity.inhouseuser;

import org.jssec.android.shared.PkgCert;
import org.jssec.android.shared.SigPerm;
import org.jssec.android.shared.Utils;
import android.app.Activity;
import android.content.ActivityNotFoundException;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;

public class InhouseUserActivity extends Activity {

    // Target Activity information
    private static final String TARGET_PACKAGE = "org.jssec.android.activity.inhouseactivity";
    private static final String TARGET_ACTIVITY = "org.jssec.android.activity.inhouseactivity.InhouseActivity";
    // In-house Signature Permission
    private static final String MY_PERMISSION = "org.jssec.android.activity.inhouseactivity.MY_PERMISSION";
    // In-house certificate hash value
    private static String sMyCertHash = null;

    private static String myCertHash(Context context) {
        if (sMyCertHash == null) {
            if (Utils.isDebuggable(context)) {
                // Certificate hash value of "androiddebugkey" in the debug.keystore.
                sMyCertHash = "0EFB7236 328348A9 89718BAD DF57F544 D5CCB4AE B9DB34BC 1E29DD26 F77C8255";
            } else {
                // Certificate hash value of "my company key" in the keystore.
                sMyCertHash = "D397D343 A5CBC10F 4EDDEB7C A10062DE 5690984F 1FB9E88B D7B3A7C2 42E142CA";
            }
        }
        return sMyCertHash;
    }

    private static final int REQUEST_CODE = 1;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }

    public void onUseActivityClick(View view) {
        // *** POINT 11 *** Verify that the in-house signature permission is defined by an in-house application.
        if (!SigPerm.test(this, MY_PERMISSION, myCertHash(this))) {
            Toast.makeText(this, "The in-house signature permission is not declared by in-house application.",
            Toast.LENGTH_LONG).show();
            return;
        }
        // ** POINT 12 *** Verify that the destination application is signed with the in-house certificate.
        if (!PkgCert.test(this, TARGET_PACKAGE, myCertHash(this))) {
            Toast.makeText(this, "Target application is not an in-house application.", Toast.LENGTH_LONG).show();
            return;
        }
        try {
            Intent intent = new Intent();
            // *** POINT 13 *** Sensitive information can be sent only by putExtra() since the destination application is in-house.
            intent.putExtra("PARAM", "Sensitive Info");

            // *** POINT 14 *** Use explicit intents to call an In-house Activity.
            intent.setClassName(TARGET_PACKAGE, TARGET_ACTIVITY);
            startActivityForResult(intent, REQUEST_CODE);
        } catch (ActivityNotFoundException e) {
            Toast.makeText(this, "Target activity not found.", Toast.LENGTH_LONG).show();
        }
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (resultCode != RESULT_OK) return;
        switch (requestCode) {
            case REQUEST_CODE:
                String result = data.getStringExtra("RESULT");
                // *** POINT 15 *** Handle the received data carefully and securely,
                // even though the data came from an in-house application.
                // Omitted, since this is a sample. Please refer to "3.2 Handling".
        }
}
``` **SigPerm.java**

public static String hash(Context ctx, String sigPermName) {
    if (sigPermName == null) return null;
    try {
        // Получаем имя пакета приложения, которое объявляет разрешение с именем sigPermName.
        PackageManager pm = ctx.getPackageManager();
        PermissionInfo pi;
        pi = pm.getPermissionInfo(sigPermName, PackageManager.GET_META_DATA);
        String pkgname = pi.packageName;
        // Завершаем работу с ошибкой, если разрешение с именем sigPermName не является разрешением подписи
        if (pi.protectionLevel != PermissionInfo.PROTECTION_SIGNATURE) return null;
        // Возвращаем значение хэша сертификата приложения, которое заявляет разрешение с именем sigPermName.
        return PkgCert.hash(ctx, pkgname);
    } catch (NameNotFoundException e) {
        return null;
    }
}

**PkgCert.java**

public static String hash(Context ctx, String pkgname) {
    if (pkgname == null) return null;
    try {
        PackageManager pm = ctx.getPackageManager();
        PackageInfo pkginfo = pm.getPackageInfo(pkgname, PackageManager.GET_SIGNATURES);
        if (pkginfo.signatures.length != 1) return null; // Не будет обрабатывать несколько подписей.
        Signature sig = pkginfo.signatures[0];
        byte[] cert = sig.toByteArray();
        byte[] sha256 = computeSha256(cert);
        return byte2hex(sha256);
    } catch (NameNotFoundException e) {
        return null;
    }
}

private static byte[] computeSha256(byte[] data) {
    try {
        return MessageDigest.getInstance("SHA-256").digest(data);
    } catch (NoSuchAlgorithmException e) {
        return null;
    }
}

private static String byte2hex(byte[] data) {
    if (data == null) return null;
    final StringBuilder hexadecimal = new StringBuilder();
    for (final byte b : data) {
        hexadecimal.append(String.format("%02X", b));
    }
    return hexadecimal.toString();
}

*Надо отметить 16: при экспорте APK используйте тот же ключ разработчика для подписания APK.*