文件加密解密的输出文件名可以进行预解析

Author: cforth

README.md

@@ -3,6 +3,10 @@ CryptoApp安卓版
 
 经过考虑，我决定开源CryptoApp-Android，虽然是学习Android开发时顺手开发的练手项目，但还是希望对大家有用。
 
+## 2021-01-08
+
+文件加密解密功能中，输出文件名可以进行预先加密或解密了。
+
 ## 2020-12-08
 
 修改了主页

app/build.gradle

@@ -11,7 +11,7 @@ android {
         minSdkVersion 21
         targetSdkVersion 29
         versionCode 1
-        versionName "1.2.2"
+        versionName "1.2.3"
 
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
     }

app/src/main/ic_launcher-playstore.png

@@ -3,13 +3,16 @@ package com.example.cryptoapp
 import android.app.Activity
 import android.content.Intent
 import android.net.Uri
+import android.os.Build
 import androidx.appcompat.app.AppCompatActivity
 import android.os.Bundle
 import android.os.Handler
 import android.os.Message
+import android.util.Log
 import android.view.Menu
 import android.view.MenuItem
 import android.view.View
+import androidx.annotation.RequiresApi
 import androidx.core.view.GravityCompat
 import com.google.android.material.snackbar.Snackbar
 import kotlinx.android.synthetic.main.activity_file.*
@@ -19,6 +22,7 @@ import kotlinx.android.synthetic.main.activity_file.passwordEditText
 import kotlinx.android.synthetic.main.activity_main.drawerLayout
 import kotlinx.android.synthetic.main.activity_main.navView
 import kotlinx.android.synthetic.main.activity_main.toolbar
+import kotlinx.android.synthetic.main.activity_text.*
 import java.io.*
 import java.lang.ref.WeakReference
 import kotlin.concurrent.thread
@@ -90,6 +94,7 @@ class FileActivity : AppCompatActivity(), View.OnClickListener {
         decryptButton.setOnClickListener(this)
     }
 
+    @RequiresApi(Build.VERSION_CODES.O)
     override fun onClick(v: View?) {
         when (v?.id) {
             R.id.readFileButton -> {
@@ -141,11 +146,21 @@ class FileActivity : AppCompatActivity(), View.OnClickListener {
 
     }
 
+    @RequiresApi(Build.VERSION_CODES.O)
     private fun setToFileUri() {
+        val password = passwordEditText.text.toString()
+        val readName = readPathEditText.text.toString()
+        // 通过输入文件名是否包含特殊后缀来判断输出文件名默认值是加密还是解密后的字符串
+        val outputName = if (readName.contains(".cf", ignoreCase = true)) {
+            fileNameHandle(readName.substring(0, readName.lastIndexOf('.')), password, "DECRYPT")
+        } else {
+            fileNameHandle(readName, password, "ENCRYPT") + ".cf"
+        }
+
         val intent =Intent(Intent.ACTION_CREATE_DOCUMENT)
         intent.addCategory(Intent.CATEGORY_OPENABLE)
         intent.type = "*/*"
-        intent.putExtra(Intent.EXTRA_TITLE,"OutPutName")
+        intent.putExtra(Intent.EXTRA_TITLE, outputName)
         startActivityForResult(intent, REQUEST_CODE_FOR_CREATE_FILE)
     }
 
@@ -172,6 +187,29 @@ class FileActivity : AppCompatActivity(), View.OnClickListener {
         }
     }
 
+    @RequiresApi(Build.VERSION_CODES.O)
+    fun fileNameHandle(inputName: String, password:String, option: String): String {
+        var outputName = ""
+        if (option == "ENCRYPT") {
+            outputName = try {
+                StringCrypto(password).encrypt(inputName)
+            } catch (e: Exception) {
+                Log.d("Encrypt Error", "Encrypt input name exception!")
+                "EncryptNameError"
+            }
+        } else if (option == "DECRYPT"){
+            outputName = try {
+                StringCrypto(password).decrypt(inputName)
+            } catch (e: Exception) {
+                Log.d("Decrypt Error", "Decrypt input name exception!")
+                "DecryptNameError"
+            }
+        } else {
+            outputName = ""
+        }
+        return outputName
+    }
+
     private fun fileHandle(uri: Uri, option: String): Boolean {
         val inputFileResolver = contentResolver.openFileDescriptor(uri, "r")
         val outputFileResolver = contentResolver.openFileDescriptor(toFileUri!!, "w")

app/src/main/java/com/example/cryptoapp/FileActivity.kt

@@ -9,7 +9,7 @@
         android:id="@+id/iconImge"
         android:layout_width="70dp"
         android:layout_height="70dp"
-        android:src="@drawable/nav_icon"
+        android:src="@drawable/logo"
         android:layout_centerInParent="true" />
 
     <TextView
@@ -26,7 +26,7 @@
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_above="@id/appInfoText"
-        android:text="CryptoApp V1.2.2"
+        android:text="CryptoApp V1.2.3"
         android:textColor="#FFF"
         android:textSize="14sp" />