Proyectos de Subversion Android Microlearning - Inconcert

package com.cesams.twogetskills.inconcert.activity;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;

import android.os.Bundle;

import android.util.Log;

import android.view.View;

import android.widget.ProgressBar;

import com.cesams.twogetskills.inconcert.Constants;

import com.cesams.twogetskills.inconcert.R;

import com.cesams.twogetskills.inconcert.library.Functions;

import com.cesams.twogetskills.inconcert.library.Http;

import com.cesams.twogetskills.inconcert.library.MD5;

import com.github.barteksc.pdfviewer.PDFView;

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.util.Calendar;

import java.util.Random;

import java.util.TimeZone;

import okhttp3.Call;

import okhttp3.Callback;

import okhttp3.OkHttpClient;

import okhttp3.Request;

import okhttp3.Response;

public class PdfActivity extends AppCompatActivity  {

    private final static String TAG = "C2GS - PdfActivity";

    private static final int BUFFER_SIZE = 4096;

    private File mOutputFile;

    private PDFView mPdfView;

    private ProgressBar mProgressBar;

    private String documentUrl;

    private String deviceId;

    private String password;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_pdf);

        documentUrl = getIntent().getStringExtra("documentUrl");

        deviceId = getIntent().getStringExtra("deviceId");

        password = getIntent().getStringExtra("password");

        mPdfView = (PDFView) findViewById(R.id.activity_pdf_document);

        mProgressBar = (ProgressBar ) findViewById(R.id.activity_pdf_progress_bar);

        try {

            TimeZone timeZone = TimeZone.getTimeZone("UTC");

            Calendar calendar = Calendar.getInstance(timeZone);

            TimeZone tz = calendar.getTimeZone();

            int created =  (int) (calendar.getTimeInMillis() / 1000);

            Random random = new Random(created);

            int rand = 1000 + random.nextInt(8999);

            Log.d(TAG, "token = " + deviceId);

            Log.d(TAG, "created = " + created);

            Log.d(TAG, "rand = " + rand);

            Log.d(TAG, "calc = " + password + ':' +  created + ':' + rand);

            String secret = MD5.generar(password + ':' +  created + ':' + rand);

            Log.d(TAG, "secret = " + secret);

            Http http = new Http(getCacheDir(), deviceId, secret, created, rand);

            OkHttpClient client = http.getHttpClient(false);

            Log.d(TAG, "URL = " + documentUrl);

            Request request = new Request.Builder()

                    .url(documentUrl)

                    .build();

            Call call = client.newCall(request);

            call.enqueue(new Callback() {

                public void onResponse(Call call, Response response)

                        throws IOException {

                    File outputDir = getApplication().getCacheDir(); // context being the Activity pointer

                    mOutputFile = File.createTempFile("2getskills", ".pdf", outputDir);

                    mProgressBar.setVisibility(View.VISIBLE);

                    String fileName;

                    String disposition = response.header("Content-Disposition");

                    String contentType = response.header("Content-Type");

                    int contentLength = Functions.Numero2Int(response.header("Content-Length"));

                    System.out.println("Content-Type = " + contentType);

                    System.out.println("Content-Disposition = " + disposition);

                    System.out.println("Content-Length = " + contentLength);

                    // opens input stream from the HTTP connection

                    InputStream inputStream = response.body().byteStream();

                    // opens an output stream to save into file

                    FileOutputStream outputStream = new FileOutputStream(mOutputFile);

                    int bytesRead = -1;

                    byte[] buffer = new byte[BUFFER_SIZE];

                    while ((bytesRead = inputStream.read(buffer)) != -1) {

                        outputStream.write(buffer, 0, bytesRead);

                        Log.d(TAG, "bytesRead = " + bytesRead);

                    }

                    outputStream.close();

                    inputStream.close();

                    mPdfView.fromFile(mOutputFile)

                            .enableSwipe(true) // allows to block changing pages using swipe

                            .swipeHorizontal(false)

                            .enableDoubletap(true)

                            .defaultPage(0)

                            // allows to draw something on the current page, usually visible in the middle of the screen

                            .enableAnnotationRendering(false) // render annotations (such as comments, colors or forms)

                            .password(null)

                            .scrollHandle(null)

                            .enableAntialiasing(true) // improve rendering a little bit on low-res screens

                            // spacing between pages in dp. To define spacing color, set view background

                            .spacing(0)

                            .load();

                }

                public void onFailure(Call call, IOException e) {

                    Log.d(TAG, "Error :  " +  e.getMessage());

                }

            });

            File outputDir = getApplication().getCacheDir(); // context being the Activity pointer

            mOutputFile = File.createTempFile("2getskills", ".pdf", outputDir);

            mProgressBar.setVisibility(View.VISIBLE);

        } catch(Exception e) {

            mOutputFile = null;

        }

    }

    @Override

    public void onBackPressed() {

        if(mOutputFile != null) {

            if(mOutputFile.exists()) {

                mOutputFile.delete();

                mOutputFile = null;

            }

        }

        Intent intent = new Intent();

        intent.putExtra("completed", true);

        intent.putExtra("requestCode", Constants.REQUEST_CODE_PDF);

        setResult(RESULT_OK, intent);

        finish();

    }

    @Override

    protected void onDestroy() {

        super.onDestroy();

        if(mOutputFile != null) {

            if(mOutputFile.exists()) {

                mOutputFile.delete();

            }

        }

    }

    @Override

    protected void onPause() {

        super.onPause();

        finish();

    }

}