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<&初始化GT;(FileOutputStream.java:94)06-06 13:18:13.402:W / System.err的(1056):在java.io.FileOutputStream中的<&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Android 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<字符串,整数,字符串> { @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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