bug fix

WebView可以下載文件了。

app/src/main/java/edu_cn/pku/course/activities/ContentViewActivity.java

@@ -280,7 +280,7 @@ protected String doInBackground(Void... params) {
  int lengthOfFile = connection.getContentLength();
 
  // input stream to read file - with 8k buffer
- InputStream input = new BufferedInputStream(url.openStream(), 8192);
+ InputStream input = new BufferedInputStream(connection.getInputStream(), 8192);
 
  fileName = currentDownloadFileName;
 

app/src/main/java/edu_cn/pku/course/activities/WebViewActivity.java

@@ -1,27 +1,54 @@
 package edu_cn.pku.course.activities;
 
+import android.Manifest;
 import android.annotation.SuppressLint;
+import android.app.ProgressDialog;
+import android.content.ActivityNotFoundException;
 import android.content.Context;
+import android.content.Intent;
 import android.content.SharedPreferences;
 import android.graphics.Bitmap;
+import android.net.Uri;
+import android.os.AsyncTask;
 import android.os.Build;
 import android.os.Bundle;
+import android.support.annotation.NonNull;
 import android.support.annotation.RequiresApi;
+import android.support.v4.content.FileProvider;
 import android.support.v4.widget.SwipeRefreshLayout;
 import android.support.v7.app.ActionBar;
 import android.support.v7.app.AppCompatActivity;
 import android.view.MenuItem;
 import android.webkit.CookieManager;
 import android.webkit.CookieSyncManager;
+import android.webkit.DownloadListener;
+import android.webkit.MimeTypeMap;
+import android.webkit.URLUtil;
 import android.webkit.WebResourceRequest;
 import android.webkit.WebView;
 import android.webkit.WebViewClient;
+import android.widget.Toast;
+
+import java.io.BufferedInputStream;
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.net.HttpURLConnection;
+import java.net.URL;
+
+import edu_cn.pku.course.Utils;
+import pub.devrel.easypermissions.EasyPermissions;
 
 public class WebViewActivity extends AppCompatActivity implements SwipeRefreshLayout.OnRefreshListener {
 
  private SwipeRefreshLayout mSwipeContainer;
  private WebView mWebView;
 
+ private String currentDownloadUrl = "";
+ private String currentDownloadFileName = "";
+ private static final int WRITE_REQUEST_CODE = 300;
+
  @SuppressLint("SetJavaScriptEnabled")
  @Override
  protected void onCreate(Bundle savedInstanceState) {
@@ -84,6 +111,16 @@ public void onPageFinished(final WebView view, String url) {
  }
  }
  });
+
+ mWebView.setDownloadListener(new DownloadListener() {
+ @Override
+ public void onDownloadStart(String url, String userAgent, String contentDisposition, String mimeType, long contentLength) {
+ currentDownloadFileName = URLUtil.guessFileName(url, contentDisposition, mimeType);
+ currentDownloadUrl = url;
+ startDownload();
+ }
+ });
+
  mSwipeContainer.setRefreshing(true);
  mWebView.loadUrl("http://course.pku.edu.cn" + getIntent().getStringExtra("WebViewUrl"));
 
@@ -105,4 +142,167 @@ public boolean onOptionsItemSelected(MenuItem item) {
  public void onRefresh() {
  mSwipeContainer.setRefreshing(false);
  }
+
+ public void startDownload() {
+
+ //check if app has permission to write to the external storage.
+ if (EasyPermissions.hasPermissions(this, Manifest.permission.WRITE_EXTERNAL_STORAGE)) {
+ //Get the URL entered
+ new DownloadFile().execute();
+
+ } else {
+ //If permission is not present request for the same.
+ if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
+ EasyPermissions.requestPermissions(this, "PKU Courses是开源软件，绝不会滥用权限。请授权存储权限以下载文件。", WRITE_REQUEST_CODE, Manifest.permission.WRITE_EXTERNAL_STORAGE);
+ }
+ }
+ }
+
+ private void openFile(String filePath) {
+ final Uri data = FileProvider.getUriForFile(getApplicationContext(), "edu_cn.pku.course", new File(filePath));
+ grantUriPermission(getPackageName(), data, Intent.FLAG_GRANT_READ_URI_PERMISSION);
+ MimeTypeMap myMime = MimeTypeMap.getSingleton();
+ Intent newIntent = new Intent(Intent.ACTION_VIEW);
+ String mimeType = myMime.getMimeTypeFromExtension(fileExt(filePath));
+ newIntent.setDataAndType(data, mimeType);
+ newIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+ newIntent.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
+ try {
+ startActivity(newIntent);
+ } catch (ActivityNotFoundException e) {
+ Toast.makeText(getApplicationContext(), "No handler for this type of file.", Toast.LENGTH_LONG).show();
+ }
+ }
+
+ @NonNull
+ private String fileExt(String url) {
+ if (url.contains("?")) {
+ url = url.substring(0, url.indexOf("?"));
+ }
+ if (url.lastIndexOf(".") == -1) {
+ return ".";
+ } else {
+ String ext = url.substring(url.lastIndexOf(".") + 1);
+ if (ext.contains("%")) {
+ ext = ext.substring(0, ext.indexOf("%"));
+ }
+ if (ext.contains("/")) {
+ ext = ext.substring(0, ext.indexOf("/"));
+ }
+ return ext.toLowerCase();
+ }
+ }
+
+ /**
+ * Async Task to download file from URL
+ */
+ @SuppressLint("StaticFieldLeak")
+ private class DownloadFile extends AsyncTask<Void, String, String> {
+
+ private ProgressDialog progressDialog;
+ private String fileName;
+ private String folder;
+// private boolean isDownloaded;
+
+ /**
+ * Before starting background thread
+ * Show Progress Bar Dialog
+ */
+ @Override
+ protected void onPreExecute() {
+ super.onPreExecute();
+ this.progressDialog = new ProgressDialog(WebViewActivity.this, R.style.AlertDialogTheme);
+ this.progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
+ this.progressDialog.setCancelable(false);
+ this.progressDialog.show();
+ }
+
+ /**
+ * Downloading file in background thread
+ */
+ @Override
+ protected String doInBackground(Void... params) {
+ int count;
+ try {
+ SharedPreferences sharedPreferences = getSharedPreferences("login_info", Context.MODE_PRIVATE);
+ String session_id = sharedPreferences.getString("session_id", null);
+
+ URL url = new URL(currentDownloadUrl);
+ HttpURLConnection connection = (HttpURLConnection) url.openConnection();
+ connection.setRequestProperty("Cookie", "session_id=" + session_id);
+ connection.connect();
+ // getting file length
+ int lengthOfFile = connection.getContentLength();
+
+ // input stream to read file - with 8k buffer
+ InputStream input = new BufferedInputStream(connection.getInputStream(), 8192);
+
+ fileName = currentDownloadFileName;
+
+ //External directory path to save file
+ folder = Utils.downloadFolder;
+
+ //Create androiddeft folder if it does not exist
+ File directory = new File(folder);
+
+ if (!directory.exists()) {
+ if (!directory.mkdirs()) {
+ throw new Exception("Error creating folder");
+ }
+ }
+
+ // Output stream to write file
+ OutputStream output = new FileOutputStream(folder + fileName);
+
+ byte data[] = new byte[1024];
+
+ long total = 0;
+
+ while ((count = input.read(data)) != -1) {
+ total += count;
+ // publishing the progress....
+ // After this onProgressUpdate will be called
+ publishProgress("" + (int) ((total * 100) / lengthOfFile));
+
+ // writing data to file
+ output.write(data, 0, count);
+ }
+
+ // flushing output
+ output.flush();
+
+ // closing streams
+ output.close();
+ input.close();
+ return folder + fileName;
+
+ } catch (Exception e) {
+ return Utils.errorPrefix + e.getMessage();
+ }
+ }
+
+ /**
+ * Updating progress bar
+ */
+ protected void onProgressUpdate(String... progress) {
+ // setting progress percentage
+ progressDialog.setProgress(Integer.parseInt(progress[0]));
+ }
+
+
+ @Override
+ protected void onPostExecute(String message) {
+ // dismiss the dialog after the file was downloaded
+ this.progressDialog.dismiss();
+
+ if (message.startsWith(Utils.errorPrefix)) {
+ Toast.makeText(getApplicationContext(), message, Toast.LENGTH_LONG).show();
+ return;
+ }
+
+ Toast.makeText(getApplicationContext(), "File downloaded at: " + message, Toast.LENGTH_LONG).show();
+
+ openFile(message);
+ }
+ }
 }

app/src/main/java/edu_cn/pku/course/fragments/CourseListFragment.java

@@ -7,7 +7,6 @@
 import android.content.Context;
 import android.content.Intent;
 import android.content.SharedPreferences;
-import android.graphics.Color;
 import android.os.AsyncTask;
 import android.os.Build;
 import android.os.Bundle;
@@ -79,7 +78,6 @@ public void onClick(View v) {
  editor.apply();
  }
  })
- .setActionTextColor(Color.rgb(255, 51, 51))
  .show();
  showLongPressHintFlag = false;
  }

app/src/main/java/edu_cn/pku/course/fragments/MyGradeFragment.java

@@ -7,7 +7,6 @@
 import android.content.Context;
 import android.content.Intent;
 import android.content.SharedPreferences;
-import android.graphics.Color;
 import android.os.AsyncTask;
 import android.os.Build;
 import android.os.Bundle;
@@ -78,7 +77,6 @@ public void onClick(View v) {
  editor.apply();
  }
  })
- .setActionTextColor(Color.rgb(255, 51, 51))
  .show();
  showLongPressHintFlag = false;
  }