Android文件加解密

Android文件加解密

package com.example.administrator.bigfileencrypt;

import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

import java.io.File;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;
import java.util.UUID;

public class MainActivity extends AppCompatActivity implements View.onclickListener {
    TextView uuid_textView;
    TextView path_textView;

    @Override
    protected void onCreate（Bundle savedInstanceState） {
        super.onCreate（savedIn

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2018-05-15 10:22  BigFileEncrypt\
     文件         127  2018-05-15 10:21  BigFileEncrypt\.gitignore
     目录           0  2018-05-15 10:22  BigFileEncrypt\.gradle\
     目录           0  2018-05-15 10:47  BigFileEncrypt\.gradle\3.3\
     目录           0  2018-05-15 10:22  BigFileEncrypt\.gradle\3.3\taskArtifacts\
     文件      136033  2018-05-15 12:01  BigFileEncrypt\.gradle\3.3\taskArtifacts\fileHashes.bin
     文件     1447062  2018-05-15 12:01  BigFileEncrypt\.gradle\3.3\taskArtifacts\fileSnapshots.bin
     文件       76968  2018-05-15 12:01  BigFileEncrypt\.gradle\3.3\taskArtifacts\taskArtifacts.bin
     文件          17  2018-05-15 12:01  BigFileEncrypt\.gradle\3.3\taskArtifacts\taskArtifacts.lock
     目录           0  2018-05-15 10:47  BigFileEncrypt\.gradle\3.3\tasks\
     目录           0  2018-05-15 10:47  BigFileEncrypt\.gradle\3.3\tasks\_app_compileDebugJavaWithJavac\
     目录           0  2018-05-15 10:47  BigFileEncrypt\.gradle\3.3\tasks\_app_compileDebugJavaWithJavac\localClassSetAnalysis\
     文件       50165  2018-05-15 12:01  BigFileEncrypt\.gradle\3.3\tasks\_app_compileDebugJavaWithJavac\localClassSetAnalysis\localClassSetAnalysis.bin
     文件          17  2018-05-15 12:01  BigFileEncrypt\.gradle\3.3\tasks\_app_compileDebugJavaWithJavac\localClassSetAnalysis\localClassSetAnalysis.lock
     目录           0  2018-05-15 10:47  BigFileEncrypt\.gradle\3.3\tasks\_app_compileDebugJavaWithJavac\localJarClasspathSnapshot\
     文件       20101  2018-05-15 12:01  BigFileEncrypt\.gradle\3.3\tasks\_app_compileDebugJavaWithJavac\localJarClasspathSnapshot\localJarClasspathSnapshot.bin
     文件          17  2018-05-15 12:01  BigFileEncrypt\.gradle\3.3\tasks\_app_compileDebugJavaWithJavac\localJarClasspathSnapshot\localJarClasspathSnapshot.lock
     目录           0  2018-05-15 12:08  BigFileEncrypt\.idea\
     文件         686  2018-05-15 10:22  BigFileEncrypt\.idea\compiler.xml
     目录           0  2018-05-15 10:22  BigFileEncrypt\.idea\copyright\
     文件          76  2018-05-15 10:22  BigFileEncrypt\.idea\copyright\profiles_settings.xml
     文件         626  2018-05-15 10:22  BigFileEncrypt\.idea\gradle.xml
     目录           0  2018-05-15 10:22  BigFileEncrypt\.idea\libraries\
     文件         625  2018-05-15 10:22  BigFileEncrypt\.idea\libraries\animated_vector_drawable_26_0_0_alpha1.xml
     文件         589  2018-05-15 10:22  BigFileEncrypt\.idea\libraries\appcompat_v7_26_0_0_alpha1.xml
     文件         410  2018-05-15 10:22  BigFileEncrypt\.idea\libraries\constraint_layout_1_0_2.xml
     文件         340  2018-05-15 10:22  BigFileEncrypt\.idea\libraries\constraint_layout_solver_1_0_2.xml
     文件         582  2018-05-15 10:22  BigFileEncrypt\.idea\libraries\espresso_core_2_2_2.xml
     文件         615  2018-05-15 10:22  BigFileEncrypt\.idea\libraries\espresso_idling_resource_2_2_2.xml
     文件         633  2018-05-15 10:22  BigFileEncrypt\.idea\libraries\exposed_instrumentation_api_publish_0_5.xml
     文件         526  2018-05-15 10:22  BigFileEncrypt\.idea\libraries\hamcrest_core_1_3.xml
............此处省略72个文件信息