Improved caching

It still not working because of some permission issues with reading data from a URL.

Author: julianschmuckli

.gitignore

@@ -9,3 +9,4 @@
 /captures
 .externalNativeBuild
 .idea/caches/build_file_checksums.ser
+.idea/caches/build_file_checksums.ser

app/src/main/AndroidManifest.xml

@@ -6,6 +6,9 @@
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.REORDER_TASKS" />
     <uses-permission android:name="android.permission.CAMERA" />
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
+    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
+
     <uses-feature
         android:name="android.hardware.camera"
         android:required="false" />

app/src/main/java/com/coderbunker/kioskapp/KioskActivity.java

@@ -38,8 +38,6 @@
 import com.gun0912.tedpermission.PermissionListener;
 import com.gun0912.tedpermission.TedPermission;
 
-import java.net.MalformedURLException;
-import java.net.URL;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
@@ -78,6 +76,8 @@ public class KioskActivity extends Activity implements Observer {
     private Camera mCamera;
     private CameraPreview mCameraPreview;
 
+    private boolean enableCaching = false;
+
     @Override
     public void onBackPressed() {
         //Do nothing...
@@ -142,23 +142,18 @@ public void run() {
             public WebResourceResponse shouldInterceptRequest(WebView view, WebResourceRequest request) {
                 System.out.println("Test: " + request.getUrl().toString());
 
-                try {
+                if (enableCaching) {
                     if (request.getUrl().toString().contains(".mp4") || request.getUrl().toString().contains(".wav")) {
                         String[] url_parts = request.getUrl().toString().split("/");
                         String file_name = url_parts[url_parts.length - 1];
 
                         if (SaveAndLoad.readFromFile(file_name, KioskActivity.this).equals("")) {
-                            String response = URLRequest.requestURL(new URL(request.getUrl().toString()), "GET", "");
-
-                            SaveAndLoad.writeToFile(file_name, response, KioskActivity.this);
+                            URLRequest.startDownload(request.getUrl().toString(), file_name);
                         }
                         return new WebResourceResponse(SaveAndLoad.getMimeType(request.getUrl().toString()), "UTF-8", SaveAndLoad.readFromFileAndReturnInputStream(file_name, KioskActivity.this));
 
                     }
-                } catch (MalformedURLException e) {
-                    e.printStackTrace();
                 }
-
                 return super.shouldInterceptRequest(view, request);
             }
 

app/src/main/java/com/coderbunker/kioskapp/lib/URLRequest.java

@@ -1,9 +1,14 @@
 package com.coderbunker.kioskapp.lib;
 
+import android.os.AsyncTask;
+import android.os.Environment;
 import android.os.StrictMode;
+import android.util.Log;
 
 import java.io.BufferedInputStream;
 import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
@@ -14,7 +19,6 @@
 
 public class URLRequest {
     public static String requestURL(URL url, String method, String body) {
-
         StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
         StrictMode.setThreadPolicy(policy);
 
@@ -74,7 +78,56 @@ public static String requestURL(URL url, String method, String body) {
             }
             return result;
         } catch (NullPointerException e) {
+            e.printStackTrace();
             return "";
         }
     }
-}
+
+    private static class Download extends AsyncTask<String, String, String> {
+        @Override
+        protected void onPreExecute() {
+
+        }
+
+        @Override
+        protected String doInBackground(String... arg0) {
+            downloadFile(arg0[0], arg0[1]);
+            return null;
+        }
+
+        @Override
+        protected void onPostExecute(String s) {
+            System.out.println("Downloaded");
+        }
+    }
+
+    public static void startDownload(String fileURL, String fileName) {
+        (new Download()).execute(fileURL, fileName);
+
+    }
+
+    private static void downloadFile(String fileURL, String fileName) {
+        try {
+            String rootDir = Environment.getExternalStorageDirectory()
+                    + File.separator + "Video";
+            File rootFile = new File(rootDir);
+            rootFile.mkdir();
+            URL url = new URL(fileURL);
+            HttpURLConnection c = (HttpURLConnection) url.openConnection();
+            c.setRequestMethod("GET");
+            c.setDoOutput(true);
+            c.connect();
+            FileOutputStream f = new FileOutputStream(new File(rootFile,
+                    fileName));
+            InputStream in = c.getInputStream();
+            byte[] buffer = new byte[1024];
+            int len1 = 0;
+            while ((len1 = in.read(buffer)) > 0) {
+                f.write(buffer, 0, len1);
+            }
+            f.close();
+        } catch (IOException e) {
+            Log.d("Error....", e.toString());
+        }
+    }
+}