com.slimroms.myapplication.MainActivity.java Source code

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Here is the source code for com.slimroms.myapplication.MainActivity.java

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/*
 * Copyright (C) 2017 SlimRoms Project
 * Copyright (C) 2017 Griffin Millender
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.slimroms.myapplication;

import android.Manifest;
import android.content.pm.PackageManager;
import android.content.res.AssetManager;
import android.os.Environment;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

import com.slimroms.themecore.AssetUtils;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        if (ContextCompat.checkSelfPermission(this,
                Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(this, new String[] { Manifest.permission.WRITE_EXTERNAL_STORAGE },
                    101);
        } else {
            extractAndDecryptAssets();
        }
    }

    private void extractAndDecryptAssets() {
        String toPath = Environment.getExternalStorageDirectory().getAbsolutePath() + "/extracted-assets";
        AssetManager am = getAssets();
        SecretKey secret = new SecretKeySpec(BuildConfig.DECRYPTION_KEY, "AES");

        IvParameterSpec iv = new IvParameterSpec(BuildConfig.IV_KEY);

        try {
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
            cipher.init(Cipher.DECRYPT_MODE, secret, iv);
            AssetUtils.copyAssetFolder(am, "testing", toPath, cipher);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,
            @NonNull int[] grantResults) {
        if (requestCode == 101) {
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                extractAndDecryptAssets();
            }
        }
    }
}