android-pdf-viewer在android studio应用问题说明

android-pdf-viewer在android studio应用问题说明

小白一枚，之前一直是做.NET开发的，最近需要弄一个新闻app，能力有限，只能借助HTML5 WebAPP+android studio来完成这项工作。
android studio主要用WebView来加载发布好的WebApp，打包生产APP。
其中由于显示一些pdf文档，所以研究了一下，记录一下心得，同时也希望帮助到新手们。

android 显示网络pdf，基本原理：先将pdf文件通过DownloadManager下载到手机sdk某个文件夹中，然后通过android-pdf-viewer插件进行显示。

android-pdf-viewer插件可以直接到github上下载，地址：https://github.com/barteksc/AndroidPdfViewer
或者直接到发布好的页面下载：https://github.com/barteksc/AndroidPdfViewer/releases
我下载的是：AndroidPdfViewer-2.1.0版本zip包

将下载AndroidPdfViewer-2.1.0包解压出来，再你的app项目中，打开 File -> New -> Import Module 选择到刚才解压的文件夹

本人目录是：D:\AndroidStudioProjects\AndroidPdfViewer-2.1.0\android-pdf-viewer

完成后，回提示先ERROR：
Error:Plugin with id ‘com.github.dcendents.android-maven’ not found.

解决方法：
点击你的工程Gradle Scripts目录下的bulid.gradle (Project:你的工程名)
在
buildscript {
repositories {
jcenter()
}
dependencies {
classpath ‘com.android.tools.build:gradle:2.0.0’
}
}
中dependencies的下添加 classpath ‘com.github.dcendents:android-maven-gradle-plugin:1.3’，
Mark Modules之后，出现新的ERROR：
Error:Plugin with id ‘com.jfrog.bintray’ not found.
此时同样在dependencies下添加：classpath “com.jfrog.bintray.gradle:gradle-bintray-plugin:1.0”
再次Mark Modules就不会报错了。
先就可以开始使用 android-pdf-viewer 插件了，

别忘记引用权限问题哦

 <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />    <uses-permission android:name="android.permission.INTERNET" />    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />    <uses-permission android:name="android.permission.DOWNLOAD_WITHOUT_NOTIFICATION"/>    <uses-permission android:name="android.permission.INSTALL_PACKAGES" />

先代码为项目中report activity.java,实现了接收另外一个activity跳转过来同时传递参数pdf地址，然后通过DownloadManager下载完成之后，显示pdf。

package cn.cgrs.myphone;import android.app.DownloadManager;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.content.IntentFilter;import android.content.SharedPreferences;import android.database.Cursor;import android.net.Uri;import android.os.Environment;import android.preference.PreferenceManager;import android.provider.OpenableColumns;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.util.Log;import android.view.View;import android.webkit.MimeTypeMap;import android.webkit.WebSettings;import android.webkit.WebView;import android.widget.TextView;import android.widget.Toast;import com.github.barteksc.pdfviewer.listener.OnLoadCompleteListener;import com.github.barteksc.pdfviewer.listener.OnPageChangeListener;import com.github.barteksc.pdfviewer.scroll.DefaultScrollHandle;import com.shockwave.pdfium.PdfDocument;import java.io.File;import java.io.UnsupportedEncodingException;import java.net.URLEncoder;import java.util.List;public class Report extends AppCompatActivity  implements OnPageChangeListener, OnLoadCompleteListener {    private com.github.barteksc.pdfviewer.PDFView pdfView ;    private TextView textView;    private DownloadManager downloadManager;    private SharedPreferences prefs;    private static String DL_ID = "downloadId";    Integer pageNumber = 0;    String pdfFileName = "yyy.pdf";    Uri uri;    String AUrl;    private Boolean isDown = false;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_report);        Intent intent = getIntent();   // 获取 Intent        AUrl  = intent.getStringExtra("url"); // 获取 String 值        Log.e("接收url:",AUrl);        //AUrl = "http://www.tyyq.cn/xhsapp/download/a03790b7f27243eeada01537a2ce2f77.pdf";        String[] exts = AUrl.split("/");        pdfFileName = exts[exts.length-1];        Log.e("pdf文件名：",pdfFileName);        String pdfName = Environment.getExternalStorageDirectory() +                "/download";        File file = new File(pdfName, pdfFileName);        pdfView = (com.github.barteksc.pdfviewer.PDFView)findViewById(R.id.pdfView);        textView = (TextView) findViewById(R.id.textView);        if(file.exists()){            Log.e("Tip：","报告已经存在！");            //文件已经存在，则直接显示            uri = Uri.fromFile(file);            displayFromUri(uri);            textView.setVisibility(View.GONE);            pdfView.setVisibility(View.VISIBLE);        }        else{            isDown = true;        }        //Log.e("prefs字符串：",prefs.toString());    }    @Override    protected void onResume(){        super.onResume();        if(isDown)        {            try{                Log.e("Tip：","报告不存在,需要下载！");                DL_ID = pdfFileName;                //文件不存在需要先下载                downloadManager = (DownloadManager)getSystemService(DOWNLOAD_SERVICE);                prefs = PreferenceManager.getDefaultSharedPreferences(this);                StartReport();            }            catch (Exception ex)            {                Toast.makeText(this, ex.getMessage(), Toast.LENGTH_LONG).show();            }        }    }    @Override    protected void onPause() {        // TODO Auto-generated method stub        super.onPause();        //unregisterReceiver(receiver);        try {            unregisterReceiver(receiver);        } catch (IllegalArgumentException e) {            if (e.getMessage().contains("Receiver not registered")) {                // Ignore this exception. This is exactly what is desired            } else {                // unexpected, re-throw                throw e;            }        }    }    //下载报告启动函数    protected void StartReport() {        // TODO Auto-generated method stub        if(!prefs.contains(DL_ID) || true) {  //           // String url = AUrl;            //Log.e("-----",AUrl);            //String[] exts = url.split("/");            //pdfFileName = "97b49c0822c14a01b3ebc273679bc6bf.pdf";                    //exts[exts.length-1];            String url = AUrl;//"http://www.tyyq.cn/RollImage/11.pdf";            Log.e("开始下载url：",AUrl);            //开始下载            Uri resource = Uri.parse(encodeGB(url));            DownloadManager.Request request = new DownloadManager.Request(resource);            request.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_MOBILE | DownloadManager.Request.NETWORK_WIFI);            request.setAllowedOverRoaming(false);            //设置文件类型            MimeTypeMap mimeTypeMap = MimeTypeMap.getSingleton();            String mimeString = mimeTypeMap.getMimeTypeFromExtension(MimeTypeMap.getFileExtensionFromUrl(url));            request.setMimeType(mimeString);            //在通知栏中显示            //设置通知栏标题            request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE);            request.setDescription("舆情报告正在下载");            //request.setShowRunningNotification(true);            request.setVisibleInDownloadsUi(true);            //sdcard的目录下的download文件夹            request.setDestinationInExternalPublicDir("/download/", pdfFileName);            request.setTitle("舆情报告");            long id = downloadManager.enqueue(request);            //保存id            prefs.edit().putLong(DL_ID, id).commit();        } else {            Log.e("提示：","下载已经开始，检查状态");            //下载已经开始，检查状态            queryDownloadStatus();        }        registerReceiver(receiver, new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));    }    /**     * 如果服务器不支持中文路径的情况下需要转换url的编码。     * @param string     * @return     */    public String encodeGB(String string)    {        //转换中文编码        String split[] = string.split("/");        for (int i = 1; i < split.length; i++) {            try {                split[i] = URLEncoder.encode(split[i], "GB2312");            } catch (UnsupportedEncodingException e) {                e.printStackTrace();            }            split[0] = split[0]+"/"+split[i];        }        split[0] = split[0].replaceAll("\\+", "%20");//处理空格        return split[0];    }    private BroadcastReceiver receiver = new BroadcastReceiver() {        @Override        public void onReceive(Context context, Intent intent) {            //这里可以取得下载的id，这样就可以知道哪个文件下载完成了。适用与多个下载任务的监听            Log.v("intent", ""+intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID, 0));            queryDownloadStatus();        }    };    private void queryDownloadStatus() {        DownloadManager.Query query = new DownloadManager.Query();        query.setFilterById(prefs.getLong(DL_ID, 0));        Cursor c = downloadManager.query(query);        if(c.moveToFirst()) {            int status = c.getInt(c.getColumnIndex(DownloadManager.COLUMN_STATUS));            switch(status) {                case DownloadManager.STATUS_PAUSED:                    Log.v("down", "STATUS_PAUSED");                case DownloadManager.STATUS_PENDING:                    Log.v("down", "STATUS_PENDING");                case DownloadManager.STATUS_RUNNING:                    //正在下载，不做任何事情                    Log.v("down", "STATUS_RUNNING");                    break;                case DownloadManager.STATUS_SUCCESSFUL:                    //完成                    Log.v("down", "下载完成");                    String pdfName = Environment.getExternalStorageDirectory() +                            "/download";                    File file = new File(pdfName, pdfFileName);                    uri = Uri.fromFile(file);                    Log.e("----",uri.toString());                    displayFromUri(uri);                    textView.setVisibility(View.GONE);                    pdfView.setVisibility(View.VISIBLE);                    break;                case DownloadManager.STATUS_FAILED:                    //清除已下载的内容，重新下载                    Log.v("down", "STATUS_FAILED");                    downloadManager.remove(prefs.getLong(DL_ID, 0));                    prefs.edit().clear().commit();                    break;            }        }    }    /*pdf显示函数集合*/    private void displayFromUri(Uri urii) {        //pdfFileName = getFileName(urii);        pdfView.fromUri(urii)                .defaultPage(pageNumber)                .onPageChange(this)                .enableAnnotationRendering(true)                .onLoad(this)                .scrollHandle(new DefaultScrollHandle(this))                .load();    }    public void onResult(int resultCode, Intent intent) {        if (resultCode == RESULT_OK) {            uri = intent.getData();            displayFromUri(uri);        }    }    @Override    public void onPageChanged(int page, int pageCount) {        pageNumber = page;        setTitle(String.format("%s %s / %s", pdfFileName, page + 1, pageCount));    }    public String getFileName(Uri uri) {        String result = null;        if (uri.getScheme().equals("content")) {            Cursor cursor = getContentResolver().query(uri, null, null, null, null);            try {                if (cursor != null && cursor.moveToFirst()) {                    result = cursor.getString(cursor.getColumnIndex(OpenableColumns.DISPLAY_NAME));                }            } finally {                if (cursor != null) {                    cursor.close();                }            }        }        if (result == null) {            result = uri.getLastPathSegment();        }        return result;    }    @Override    public void loadComplete(int nbPages) {        PdfDocument.Meta meta = pdfView.getDocumentMeta();        printBookmarksTree(pdfView.getTableOfContents(), "-");    }    public void printBookmarksTree(List<PdfDocument.Bookmark> tree, String sep) {        for (PdfDocument.Bookmark b : tree) {            // Log.e(TAG, String.format("%s %s, p %d", sep, b.getTitle(), b.getPageIdx()));            if (b.hasChildren()) {                printBookmarksTree(b.getChildren(), sep + "-");            }        }    }}