Android使用TBS浏览器加载pdf等文件
版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/qingfeng812/article/details/79077350 项目结构 技术方案 TBS的其它优点，可以自行搜索网上其它资料，很多。 加载文件核心类是 TbsReaderView，腾讯文档没有写，所以需要查找网上资料。 TBS目前只支持加载本地文件。所以远程文件需要先下载，后用TBS加载文件显示。 负责加载和显示文件的界面，离开本界面之后务必需要销毁，否则再次加载文件无法加载成功，会一直显示加载文件进度条。 关键代码： mTbsReaderView.onStop();//销毁界面的时候一定要加上，否则后面加载文件会发生异常。 完整项目源码 package com.yifeng.sample.tbs; import android.app.DownloadManager; import android.app.DownloadManager.Request; import android.content.Intent; import android.database.ContentObserver; import android.database.Cursor; import android.net.Uri; import android.os.Bundle; import android.os.Environment; import android.os.Handler; import android.support.v7.app.AppCompatActivity; import android.text.TextUtils; import android.util.Log; import android.view.View; import android.view.ViewGroup.LayoutParams; import android.widget.Button; import android.widget.RelativeLayout; import com.tencent.smtt.sdk.TbsReaderView; import com.tencent.smtt.sdk.TbsReaderView.ReaderCallback; import java.io.File; public class MainActivity extends AppCompatActivity implements ReaderCallback { private TbsReaderView mTbsReaderView; private Button mDownloadBtn; private DownloadManager mDownloadManager; private long mRequestId; private DownloadObserver mDownloadObserver; private String mFileUrl = "http://www.beijing.gov.cn/zhuanti/ggfw/htsfwbxzzt/shxfl/fw/P020150720516332194302.doc"; private String mFileName; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mTbsReaderView = new TbsReaderView(this, this); mDownloadBtn = (Button) findViewById(R.id.btn_download); RelativeLayout rootRl = (RelativeLayout) findViewById(R.id.rl_root); rootRl.addView(mTbsReaderView, new RelativeLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT)); mFileName = parseName(mFileUrl); if (isLocalExist()) { mDownloadBtn.setText("打开文件"); } if (isLocalExist()) { mDownloadBtn.setVisibility(View.GONE); displayFile(); } else { startDownload(); } } @Override public void onBackPressed() { startActivity(new Intent(MainActivity.this,IndexActivity.class)); finish();//不关掉此界面，之后加载文件会无法加载 } public void onClickDownload(View v) { // if (isLocalExist()) { // mDownloadBtn.setVisibility(View.GONE); // displayFile(); // } else { // startDownload(); // } } private void displayFile() { Bundle bundle = new Bundle(); bundle.putString("filePath", "/storage/emulated/0/uu/HTTP权威指南.pdf"); bundle.putString("tempPath", Environment.getExternalStorageDirectory().getPath()); boolean result = mTbsReaderView.preOpen(parseFormat("HTTP权威指南.pdf"), false); if (result) { mTbsReaderView.openFile(bundle); } } private String parseFormat(String fileName) { return fileName.substring(fileName.lastIndexOf(".") + 1); } private String parseName(String url) { String fileName = null; try { fileName = url.substring(url.lastIndexOf("/") + 1); } finally { if (TextUtils.isEmpty(fileName)) { fileName = String.valueOf(System.currentTimeMillis()); } } return fileName; } private boolean isLocalExist() { return getLocalFile().exists(); } private File getLocalFile() { return new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS), mFileName); } private void startDownload() { mDownloadObserver = new DownloadObserver(new Handler()); getContentResolver().registerContentObserver(Uri.parse("content://downloads/my_downloads"), true, mDownloadObserver); mDownloadManager = (DownloadManager) getSystemService(DOWNLOAD_SERVICE); DownloadManager.Request request = new DownloadManager.Request(Uri.parse(mFileUrl)); request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, mFileName); request.allowScanningByMediaScanner(); request.setNotificationVisibility(Request.VISIBILITY_HIDDEN); mRequestId = mDownloadManager.enqueue(request); } private void queryDownloadStatus() { DownloadManager.Query query = new DownloadManager.Query().setFilterById(mRequestId); Cursor cursor = null; try { cursor = mDownloadManager.query(query); if (cursor != null && cursor.moveToFirst()) { //已经下载的字节数 int currentBytes = cursor.getInt(cursor.getColumnIndexOrThrow(DownloadManager.COLUMN_BYTES_DOWNLOADED_SO_FAR)); //总需下载的字节数 int totalBytes = cursor.getInt(cursor.getColumnIndexOrThrow(DownloadManager.COLUMN_TOTAL_SIZE_BYTES)); //状态所在的列索引 int status = cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_STATUS)); Log.i("downloadUpdate: ", currentBytes + " " + totalBytes + " " + status); mDownloadBtn.setText("正在下载：" + currentBytes + "/" + totalBytes); if (DownloadManager.STATUS_SUCCESSFUL == status && mDownloadBtn.getVisibility() == View.VISIBLE) { mDownloadBtn.setVisibility(View.GONE); mDownloadBtn.performClick(); } } } finally { if (cursor != null) { cursor.close(); } } } @Override public void onCallBackAction(Integer integer, Object o, Object o1) { } @Override protected void onDestroy() { super.onDestroy(); mTbsReaderView.onStop(); if (mDownloadObserver != null) { getContentResolver().unregisterContentObserver(mDownloadObserver); } } private class DownloadObserver extends ContentObserver { private DownloadObserver(Handler handler) { super(handler); } @Override public void onChange(boolean selfChange, Uri uri) { Log.i("downloadUpdate: ", "onChange(boolean selfChange, Uri uri)"); queryDownloadStatus(); } } }
