package edu_cn.pku.course.activities;
import android.Manifest;
import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.app.ProgressDialog;
import android.content.ActivityNotFoundException;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.pm.ResolveInfo;
import android.graphics.drawable.Drawable;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Build;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.support.annotation.NonNull;
import android.support.design.widget.Snackbar;
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.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.MenuItem;
import android.view.View;
import android.webkit.MimeTypeMap;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;
import com.r0adkll.slidr.Slidr;
import org.w3c.dom.CharacterData;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;
import java.net.URLConnection;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;
import edu_cn.pku.course.Utils;
import edu_cn.pku.course.adapter.ContentViewAdapter;
import pub.devrel.easypermissions.EasyPermissions;
public class ContentViewActivity extends AppCompatActivity implements SwipeRefreshLayout.OnRefreshListener, EasyPermissions.PermissionCallbacks {
private static final int WRITE_REQUEST_CODE = 300;
private AttachedFilesListLoadingTask mLoadingTask = null;
private SwipeRefreshLayout mSwipeContainer;
private RecyclerView mRecyclerView;
private ContentViewAdapter adapter;
private LinearLayout content_view_linear_layout;
private TextView content_view_title, content_view_time;
private WebView content_view_content_detail;
private String course_id, content_id;
private String currentDownloadUrl = "";
private String currentDownloadFileName = "";
static public String folder;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_content_view);
setTitle(getIntent().getStringExtra("Title"));
ActionBar actionBar = getSupportActionBar();
if (actionBar != null) {
actionBar.setDisplayHomeAsUpEnabled(true);
}
course_id = getIntent().getStringExtra("CourseId");
content_id = getIntent().getStringExtra("content_id");
mRecyclerView = findViewById(R.id.recycler_content_view_list);
mSwipeContainer = findViewById(R.id.content_view_swipe_container);
content_view_linear_layout = findViewById(R.id.content_view_linear_layout);
content_view_title = findViewById(R.id.content_view_title);
content_view_time = findViewById(R.id.content_view_time);
content_view_content_detail = findViewById(R.id.content_view_content_detail);
adapter = new ContentViewAdapter(new ArrayList<AttachedFileItem>(), this);
mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
mRecyclerView.setAdapter(adapter);
mSwipeContainer.setOnRefreshListener(this);
mSwipeContainer.setColorSchemeColors(getResources().getColor(R.color.colorPrimary), getResources().getColor(R.color.colorAccent));
showLoading(true);
mLoadingTask = new AttachedFilesListLoadingTask();
mLoadingTask.execute((Void) null);
Slidr.attach(this);
SharedPreferences sharedPreferences = getSharedPreferences("login_info", Context.MODE_PRIVATE);
folder = sharedPreferences.getString("path_preference", null);
}
@Override
public void onRefresh() {
if (mLoadingTask == null) {
mLoadingTask = new AttachedFilesListLoadingTask();
mLoadingTask.execute((Void) null);
}
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
onBackPressed();
return true;
}
return (super.onOptionsItemSelected(item));
}
@TargetApi(Build.VERSION_CODES.HONEYCOMB_MR2)
private void showLoading(final boolean show) {
// 逐渐显示mRecyclerView的小动画
int shortAnimTime = 200;
content_view_linear_layout.setVisibility(show ? View.GONE : View.VISIBLE);
content_view_linear_layout.animate().setDuration(shortAnimTime).alpha(
show ? 0 : 1).setListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
mRecyclerView.setVisibility(show ? View.GONE : View.VISIBLE);
}
});
mSwipeContainer.setRefreshing(show);
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
// Forward results to EasyPermissions
EasyPermissions.onRequestPermissionsResult(requestCode, permissions, grantResults, this);
}
@Override
public void onPermissionsGranted(int requestCode, @NonNull List<String> perms) {
new DownloadFile().execute();
}
@Override
public void onPermissionsDenied(int requestCode, @NonNull List<String> perms) {
}
public void startDownload(AttachedFileItem item) {
currentDownloadUrl = item.getUrl();
currentDownloadFileName = item.getFileName();
if (item.isDownloaded()) {
openFile(folder + currentDownloadFileName);
return;
}
//check if app has permission to write to the external storage.
if (EasyPermissions.hasPermissions(ContentViewActivity.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(ContentViewActivity.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();
}
}
public Drawable getIcon(String fileName) {
final Intent innt = new Intent(Intent.ACTION_VIEW);
MimeTypeMap myMime = MimeTypeMap.getSingleton();
String mimeType = myMime.getMimeTypeFromExtension(fileExt(fileName));
innt.setType(mimeType);
final List<ResolveInfo> matches = getPackageManager().queryIntentActivities(innt, 0);
if (matches.size() == 0)
return null;
return matches.get(0).loadIcon(getPackageManager());
}
@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 boolean isDownloaded;
/**
* Before starting background thread
* Show Progress Bar Dialog
*/
@Override
protected void onPreExecute() {
super.onPreExecute();
this.progressDialog = new ProgressDialog(ContentViewActivity.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);
URLConnection connection = 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();
// Display File path after downloading
// Toast.makeText(getApplicationContext(), message, Toast.LENGTH_LONG).show();
adapter.refreshList(); // 刷新已下载文件
openFile(message);
}
}
@SuppressLint("StaticFieldLeak")
private class AttachedFilesListLoadingTask extends AsyncTask<Void, Void, String> {
AttachedFilesListLoadingTask() {
}
@Override
protected String doInBackground(Void... params) {
return Utils.courseHttpGetRequest("http://course.pku.edu.cn/webapps/Bb-mobile-bb_bb60/contentDetail?course_id=" + course_id + "&content_id=" + content_id);
}
@Override
protected void onPostExecute(final String str) {
// 出现了错误
if (str.startsWith(Utils.errorPrefix)) {
if (str.equals(Utils.errorPrefix + Utils.errorPasswordIncorrect)) {
// 密码错误
Utils.SignOut(ContentViewActivity.this);
} else {
// 其他网络错误
Snackbar.make(mRecyclerView, str, Snackbar.LENGTH_SHORT).show();
}
} else {
Node rootNode = Utils.stringToNode(str);
if (rootNode != null) {
Element contentNode = (Element) rootNode.getFirstChild();
if (contentNode != null) {
content_view_title.setText((contentNode).getAttribute("title"));
try {
content_view_time.setText(
new SimpleDateFormat("yyyy年M月d日 H:m:s", Locale.CHINA)
.format(
new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssz", Locale.US)
.parse(contentNode.getAttribute("datemodified"))
)
);
} catch (ParseException e) {
content_view_time.setText(contentNode.getAttribute("datemodified"));
}
if (contentNode.getAttribute("contenthandler").equals("resource/x-bb-externallink")) {
Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse(contentNode.getAttribute("viewUrl")));
startActivity(browserIntent);
finish();
}
if (contentNode.getAttribute("contenthandler").equals("resource/x-bb-assignment")) {
Intent intent = new Intent(ContentViewActivity.this, WebViewActivity.class);
intent.putExtra("Title", contentNode.getAttribute("title"));
intent.putExtra("WebViewUrl", contentNode.getAttribute("viewUrl"));
startActivity(intent);
finish();
}
if ((contentNode).getElementsByTagName("body").getLength() > 0 && contentNode.getElementsByTagName("body").item(0).getFirstChild() != null) {
content_view_content_detail.getSettings().setDefaultTextEncodingName("UTF-8");
content_view_content_detail.loadData(
((CharacterData) contentNode.getElementsByTagName("body").item(0).getFirstChild()).getData()
, "text/html; charset=utf-8", null);
content_view_content_detail.setWebViewClient(new WebViewClient() {
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
if (url.startsWith("http://course.pku.edu.cn")) {
Intent intent = new Intent(ContentViewActivity.this, WebViewActivity.class);
intent.putExtra("Title", "正在打开链接...");
intent.putExtra("WebViewUrl", url.replaceFirst("http://course.pku.edu.cn", ""));
startActivity(intent);
} else {
Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
startActivity(browserIntent);
}
return true;
}
});
} else {
content_view_content_detail.setVisibility(View.GONE);
}
if ((contentNode).getElementsByTagName("attachments").getLength() > 0) {
ArrayList<AttachedFileItem> item_list = new ArrayList<>();
NodeList nList = (contentNode).getElementsByTagName("attachments").item(0).getChildNodes();
for (int i = 0; i < nList.getLength(); i++) {
item_list.add(new AttachedFileItem((Element) nList.item(i)));
}
adapter.updateList(item_list);
}
}
}
}
mLoadingTask = null;
showLoading(false);
mSwipeContainer.setEnabled(false);
}
// 没什么用的函数
@Override
protected void onCancelled() {
mLoadingTask = null;
showLoading(false);
}
}
public class AttachedFileItem {
Element n;
boolean downloaded = false;
AttachedFileItem(Element n) {
this.n = n;
}
public boolean isDownloaded() {
return downloaded;
}
public void setDownloaded(boolean b) {
downloaded = b;
}
public String getFileName() {
return n.getAttribute("name");
}
public String getFileSize() {
return Utils.readableFileSize(Integer.parseInt(n.getAttribute("filesize")));
}
public int getFileSizeInteger() {
return Integer.parseInt(n.getAttribute("filesize"));
}
private String getUrl() {
return "http://course.pku.edu.cn" + n.getAttribute("uri");
}
}
}
