遇到错误时尝试下载pdf文件

本文介绍了遇到错误时尝试下载pdf文件的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

在我的应用我试图从服务器上下载PDF文件，并​​将其存储在SD卡上，但是当我尝试下载，下载总是失败和logcat的说，没有找到处理程序。我需要帮助解决这个问题，请帮助我。谢谢

downloadText.java

包mobile.download;进口java.io. *;进口java *。进口的java.util.regex.Pattern;进口mobile.config.Kondownload;进口com.karismaelearning.R;进口android.app.Activity;进口android.os.Bundle;进口android.os.Environment;进口android.text.util.Linkify;进口android.util.Log;进口android.widget.TextView;公共类DownloadText延伸活动{    公共Kondownload linkurl;    字符串URL;    串SERVER_URL;    / **当第一次创建活动调用。 * /    @覆盖    公共无效的onCreate（捆绑savedInstanceState）{        super.onCreate（savedInstanceState）;的setContentView（R.layout.linkdownload）;        TextView的mTextLink =（的TextView）findViewById（R.id.LinkDownload）;        束束= this.getIntent（）getExtras（）。        串的param1 = bundle.getString（keyIdc）;        串参数2 = bundle.getString（keyReference）;        linkurl =新Kondownload（本）;        SERVER_URL = linkurl.getUrl（）;        SERVER_URL + =/ moodledata /+参数1 +/+ param2的;        的URLConnection URLConnection的= NULL;        尝试{            网址URL =新的URL（SERVER_URL）;            // URL currrent开幕连接            URLConnection的= url.openConnection（）;            urlConnection.connect（）;            // INT lenghtOfFile = urlConnection.getContentLength（）;        字符串PATH = Environment.getExternalStorageDirectory（）+/ PDF /;        档案文件=新的文件（路径）;        file.mkdirs（）;        文件OUTPUTFILE =新的文件（文件，参数2）;        FOS的FileOutputStream =新的FileOutputStream（OUTPUTFILE）;        InputStream为= url.openStream（）;        字节[]缓冲区=新的字节[1024];        INT LEN1 = 0;        而（（LEN1 = is.​​read（缓冲液））！= - 1）{            fos.write（缓冲液，0，LEN1）;        }        fos.close（）;        is.close（）;         的System.out.println（ - PDF下载 - 确定 - + SERVER_URL）;        }赶上（例外五）{            // TODO：处理异常            e.printStackTrace（）;        }        mTextLink.setText（SERVER_URL）;        模式模式= Patternpile（SERVER_URL）;       Linkify.addLinks（mTextLink，图案，）;    }}

logcat的

06-06 13：18：13.371：W / System.err的（1056）：java.io.FileNotFoundException：/mnt/sdcard/pdf/Dokumen/Dogmatika_1.pdf（无这样的文件或目录）06-06 13：18：13.371：W / System.err的（1056）：在org.apache.harmony.luni.platform.OSFileSystem.open（本机方法）06-06 13：18：13.391：W / System.err的（1056）：在dalvik.system.BlockGuard $ WrappedFileSystem.open（BlockGuard.java:232）06-06 13：18：13.391：W / System.err的（1056）：在java.io.FileOutputStream中的＆LT;＆初始化GT;（FileOutputStream.java:94）06-06 13：18：13.402：W / System.err的（1056）：在java.io.FileOutputStream中的＆LT;＆初始化GT;（FileOutputStream.java:66）06-06 13：18：13.402：W / System.err的（1056）：在mobile.download.DownloadText.onCreate（DownloadText.java:85）06-06 13：18：13.402：W / System.err的（1056）：在android.app.Instrumentation.callActivityOnCreate（Instrumentation.java:1047）06-06 13：18：13.402：W / System.err的（1056）：在android.app.ActivityThread.performLaunchActivity（ActivityThread.java:1611）06-06 13：18：13.402：W / System.err的（1056）：在android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:1663）06-06 13：18：13.402：W / System.err的（1056）：在android.app.ActivityThread.access $ 1500（ActivityThread.java:117）06-06 13：18：13.402：W / System.err的（1056）：在android.app.ActivityThread $ H.handleMessage（ActivityThread.java:931）06-06 13：18：13.402：W / System.err的（1056）：在android.os.Handler.dispatchMessage（Handler.java:99）06-06 13：18：13.402：W / System.err的（1056）：在android.os.Looper.loop（Looper.java:123）06-06 13：18：13.402：W / System.err的（1056）：在android.app.ActivityThread.main（ActivityThread.java:3683）06-06 13：18：13.402：W / System.err的（1056）：在java.lang.reflect.Method.invokeNative（本机方法）06-06 13：18：13.411：W / System.err的（1056）：在java.lang.reflect.Method.invoke（Method.java:507）06-06 13：18：13.411：W / System.err的（1056）：在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:839）06-06 13：18：13.411：W / System.err的（1056）：在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:597）06-06 13：18：13.411：W / System.err的（1056）：在dalvik.system.NativeStart.main（本机方法）06-06 13：18：13.861：I / ActivityManager（61）：显示com.karismaelearning / mobile.download.DownloadText：+ 649ms06-06 13：18：15.101：I / ActivityManager（61）：开始：意向{行动= android.intent.action.VIEW DAT = HTTP：//10.0.2.2/moodledata/2/Dokumen/Dogmatika_1.pdf CMP = com.android.browser / .BrowserActivity（有临时演员）}从PID 105606-06 13：18：15.831：I / ActivityManager（61）：显示com.android.browser / .BrowserActivity：+ 675ms06-06 13：18：17.271：W / InputManagerService（61）：对非重点客户com.android.internal.view.IInputMethodClient$Stub$Proxy@40554818开始输入（UID = 10020 PID = 378）06-06 13：18：17.781：D / webviewglue（378）：nativeDestroy观点：0x3e482006-06 13：18：18.541：I /下载管理器（218）：发起请求下载2206-06 13：18：19.281：W /下载管理器（218）：中止请求下载22：没有找到处理此下载类型

解决方案

检查以下code：它在> = 9的Andr​​oid API的工作

公共无效file_download（字符串URL）{        // URL =;        文件直接=新的文件（Environment.getExternalStorageDirectory（）                +/ dhaval_files）;        如果（！direct.exists（））{            direct.mkdirs（）;        }        下载管理经理=（下载管理器），这                .getSystemService（Context.DOWNLOAD_SERVICE）;        乌里downloadUri = Uri.parse（URL）;        DownloadManager.Request要求=新DownloadManager.Request（                downloadUri）;        request.setAllowedNetworkTypes（                DownloadManager.Request.NETWORK_WIFI                        | DownloadManager.Request.NETWORK_MOBILE）                .setAllowedOverRoaming（假）.setTitle（演示）                .setDescription（有用的东西。不，真的。）                .setDestinationInExternalPublicDir（/ dhaval_files，lecture3.pdf）;        mgr.enqueue（请求）;    }

调用上面的方法使用： file_download（moss.csc.ncsu.edu/~mueller/g1/lecture3.pdf）;

对少于9 Android的API使用这种方式：

进口java.io.BufferedInputStream中;进口java.io.FileOutputStream中;进口的java.io.InputStream;进口java.io.OutputStream中;进口的java.URL;进口java.URLConnection中;进口android.app.ProgressDialog;进口android.os.AsyncTask;进口android.os.Bundle;进口com.actionbarsherlock.app.SherlockActivity;公共类MainActivity延伸活动{    ProgressDialog mProgressDialog;    @覆盖    保护无效的onCreate（捆绑savedInstanceState）{        super.onCreate（savedInstanceState）;        super.setTheme（R.style.Theme_Sherlock_Light）;        的setContentView（R.layout.activity_main）;        mProgressDialog =新ProgressDialog（MainActivity.this）;        mProgressDialog.setMessage（信息）;        mProgressDialog.setIndeterminate（假）;        mProgressDialog.setMax（100）;        mProgressDialog.setProgressStyle（ProgressDialog.STYLE_HORIZONTAL）;        //执行这个时候必须下载被解雇        DownloadFile downloadFile =新DownloadFile（）;        下载文件                .execute（moss.csc.ncsu.edu/~mueller/g1/lecture3.pdf）;    }    私有类DownloadFile扩展的AsyncTask＆LT;字符串，整数，字符串＆GT; {        @覆盖        保护字符串doInBackground（字符串... SURL）{            尝试{                网址URL =新的URL（SURL [0]）;                URLConnection的连接= url.openConnection（）;                connection.connect（）;                //这将是有益的，这样就可以显示出一个典型的0-100％                // 进度条                INT文件长度= connection.getContentLength（）;                //下载文件                InputStream的输入=新的BufferedInputStream（url.openStream（））;                OutputStream的输出=新的FileOutputStream（/ SD卡/ lecture3.pdf）;                字节的数据[] =新的字节[1024];                总长= 0;                诠释计数;                而（（计数= input.read（数据））！= - 1）{                    总+ =计数;                    //发布进度....                    publishProgress（（int）的（总* 100 /文件长度））;                    output.write（数据0，计）;                }                output.flush（）;                output.close（）;                input.close（）;            }赶上（例外五）{            }            返回null;        }        @覆盖        在preExecute保护无效（）{            super.on preExecute（）;            mProgressDialog.show（）;        }        @覆盖        保护无效onProgressUpdate（整数...进度）{            super.onProgressUpdate（进度）;            mProgressDialog.setProgress（进展[0]）;        }    }}

两者code正在将其下载PDF文件。

这里是最佳答案

In my application i'm trying to download PDF file from server and storing it in SD card, but when i try to download, the download always failed and the logcat says no handler found. i need help to solve this problem, please help me. thank you

downloadText.java

package mobile.download; import java.io.*; import java.*; import java.util.regex.Pattern; import mobile.config.Kondownload; import com.karismaelearning.R; import android.app.Activity; import android.os.Bundle; import android.os.Environment; import android.text.util.Linkify; import android.util.Log; import android.widget.TextView; public class DownloadText extends Activity{ public Kondownload linkurl; String url; String SERVER_URL; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.linkdownload); TextView mTextLink = (TextView) findViewById(R.id.LinkDownload); Bundle bundle = this.getIntent().getExtras(); String param1 = bundle.getString("keyIdc"); String param2 = bundle.getString("keyReference"); linkurl = new Kondownload(this); SERVER_URL = linkurl.getUrl(); SERVER_URL += "/moodledata/"+param1+"/"+param2; URLConnection urlConnection = null; try{ URL url = new URL(SERVER_URL); //Opening connection of currrent url urlConnection = url.openConnection(); urlConnection.connect(); //int lenghtOfFile = urlConnection.getContentLength(); String PATH = Environment.getExternalStorageDirectory() + "/pdf/"; File file = new File(PATH); file.mkdirs(); File outputFile = new File(file, param2); FileOutputStream fos = new FileOutputStream(outputFile); InputStream is = url.openStream(); byte[] buffer = new byte[1024]; int len1 = 0; while ((len1 = is.read(buffer)) != -1) { fos.write(buffer, 0, len1); } fos.close(); is.close(); System.out.println("--pdf downloaded--ok--"+SERVER_URL); }catch (Exception e) { // TODO: handle exception e.printStackTrace(); } mTextLink.setText(SERVER_URL); Pattern pattern = Patternpile(SERVER_URL); Linkify.addLinks(mTextLink, pattern, ""); } }

logcat

06-06 13:18:13.371: W/System.err(1056): java.io.FileNotFoundException: /mnt/sdcard/pdf/Dokumen/Dogmatika_1.pdf (No such file or directory) 06-06 13:18:13.371: W/System.err(1056): at org.apache.harmony.luni.platform.OSFileSystem.open(Native Method) 06-06 13:18:13.391: W/System.err(1056): at dalvik.system.BlockGuard$WrappedFileSystem.open(BlockGuard.java:232) 06-06 13:18:13.391: W/System.err(1056): at java.io.FileOutputStream.<init>(FileOutputStream.java:94) 06-06 13:18:13.402: W/System.err(1056): at java.io.FileOutputStream.<init>(FileOutputStream.java:66) 06-06 13:18:13.402: W/System.err(1056): at mobile.download.DownloadText.onCreate(DownloadText.java:85) 06-06 13:18:13.402: W/System.err(1056): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 06-06 13:18:13.402: W/System.err(1056): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611) 06-06 13:18:13.402: W/System.err(1056): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663) 06-06 13:18:13.402: W/System.err(1056): at android.app.ActivityThread.access$1500(ActivityThread.java:117) 06-06 13:18:13.402: W/System.err(1056): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931) 06-06 13:18:13.402: W/System.err(1056): at android.os.Handler.dispatchMessage(Handler.java:99) 06-06 13:18:13.402: W/System.err(1056): at android.os.Looper.loop(Looper.java:123) 06-06 13:18:13.402: W/System.err(1056): at android.app.ActivityThread.main(ActivityThread.java:3683) 06-06 13:18:13.402: W/System.err(1056): at java.lang.reflect.Method.invokeNative(Native Method) 06-06 13:18:13.411: W/System.err(1056): at java.lang.reflect.Method.invoke(Method.java:507) 06-06 13:18:13.411: W/System.err(1056): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 06-06 13:18:13.411: W/System.err(1056): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 06-06 13:18:13.411: W/System.err(1056): at dalvik.system.NativeStart.main(Native Method) 06-06 13:18:13.861: I/ActivityManager(61): Displayed com.karismaelearning/mobile.download.DownloadText: +649ms 06-06 13:18:15.101: I/ActivityManager(61): Starting: Intent { act=android.intent.action.VIEW dat=10.0.2.2/moodledata/2/Dokumen/Dogmatika_1.pdf cmp=com.android.browser/.BrowserActivity (has extras) } from pid 1056 06-06 13:18:15.831: I/ActivityManager(61): Displayed com.android.browser/.BrowserActivity: +675ms 06-06 13:18:17.271: W/InputManagerService(61): Starting input on non-focused client com.android.internal.view.IInputMethodClient$Stub$Proxy@40554818 (uid=10020 pid=378) 06-06 13:18:17.781: D/webviewglue(378): nativeDestroy view: 0x3e4820 06-06 13:18:18.541: I/DownloadManager(218): Initiating request for download 22 06-06 13:18:19.281: W/DownloadManager(218): Aborting request for download 22: no handler found for this download type

解决方案

check below code: its work in >= 9 Android API.

public void file_download(String uRl) { //uRl = ; File direct = new File(Environment.getExternalStorageDirectory() + "/dhaval_files"); if (!direct.exists()) { direct.mkdirs(); } DownloadManager mgr = (DownloadManager) this .getSystemService(Context.DOWNLOAD_SERVICE); Uri downloadUri = Uri.parse(uRl); DownloadManager.Request request = new DownloadManager.Request( downloadUri); request.setAllowedNetworkTypes( DownloadManager.Request.NETWORK_WIFI | DownloadManager.Request.NETWORK_MOBILE) .setAllowedOverRoaming(false).setTitle("Demo") .setDescription("Something useful. No, really.") .setDestinationInExternalPublicDir("/dhaval_files", "lecture3.pdf"); mgr.enqueue(request); }

call above method using: file_download("moss.csc.ncsu.edu/~mueller/g1/lecture3.pdf");

For < 9 Android API use this way:

import java.io.BufferedInputStream; import java.io.FileOutputStream; import java.io.InputStream; import java.io.OutputStream; import java.URL; import java.URLConnection; import android.app.ProgressDialog; import android.os.AsyncTask; import android.os.Bundle; import com.actionbarsherlock.app.SherlockActivity; public class MainActivity extends Activity { ProgressDialog mProgressDialog; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); super.setTheme(R.style.Theme_Sherlock_Light); setContentView(R.layout.activity_main); mProgressDialog = new ProgressDialog(MainActivity.this); mProgressDialog.setMessage("A message"); mProgressDialog.setIndeterminate(false); mProgressDialog.setMax(100); mProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL); // execute this when the downloader must be fired DownloadFile downloadFile = new DownloadFile(); downloadFile .execute("moss.csc.ncsu.edu/~mueller/g1/lecture3.pdf"); } private class DownloadFile extends AsyncTask<String, Integer, String> { @Override protected String doInBackground(String... sUrl) { try { URL url = new URL(sUrl[0]); URLConnection connection = url.openConnection(); connection.connect(); // this will be useful so that you can show a typical 0-100% // progress bar int fileLength = connection.getContentLength(); // download the file InputStream input = new BufferedInputStream(url.openStream()); OutputStream output = new FileOutputStream("/sdcard/lecture3.pdf"); byte data[] = new byte[1024]; long total = 0; int count; while ((count = input.read(data)) != -1) { total += count; // publishing the progress.... publishProgress((int) (total * 100 / fileLength)); output.write(data, 0, count); } output.flush(); output.close(); input.close(); } catch (Exception e) { } return null; } @Override protected void onPreExecute() { super.onPreExecute(); mProgressDialog.show(); } @Override protected void onProgressUpdate(Integer... progress) { super.onProgressUpdate(progress); mProgressDialog.setProgress(progress[0]); } } }

both code is working it download PDF file.

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