不能能够存储图像的URL到SD卡 [英] cant able to store image from url to sdcard
本文介绍了不能能够存储图像的URL到SD卡的处理方法,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
我要存储在\ MNT \ SD卡
图片 包com.Downld_file_frm_net;
进口java.io.BufferedInputStream中;
进口的java.io.File;
进口java.io.FileOutputStream中;
进口java.io.IOException异常;
进口的java.io.InputStream;
进口的java.net.URL;
进口java.net.URLConnection中;
进口org.apache.http.util.ByteArrayBuffer;
进口android.app.Activity;
进口android.os.Bundle;
进口android.util.Log;
公共类Downld_file_frm_net延伸活动{
/ **第一次创建活动时调用。 * /
@覆盖
公共无效的onCreate(包savedInstanceState){
super.onCreate(savedInstanceState);
的setContentView(R.layout.main);
//http://203.109.115.55/MRESC/images/150.jpg
DownloadFromUrl("http://www.garyolsen.com/goclarke/digitalphotography/2006-2/NLechPortfolio/images/Fire%20Flower_jpg.jpg","Fire%20Flower_jpg.jpg");
}
公共无效DownloadFromUrl(字符串DownloadUrl,字符串文件名){
尝试 {
文件根= android.os.Environment.getExternalStorageDirectory();
文件DIR =新的文件(root.getAbsolutePath()+MNT / SD卡/);
如果(dir.exists()== FALSE){
dir.mkdirs();
}
网址URL =新的URL(DownloadUrl); //你可以在这里写任何链接
档案文件=新的文件(目录,文件名);
长的startTime = System.currentTimeMillis的();
Log.d(下载管理器,下载开始时);
Log.d(下载管理器,下载网址:+网址);
Log.d(下载管理,已下载文件的名称:+文件名);
/ *打开到URL的连接。 * /
URLConnection的UCON = url.openConnection();
/ *
*定义InputStreams从URLConnection的阅读。
* /
InputStream的是= ucon.getInputStream();
的BufferedInputStream双=新的BufferedInputStream(是);
/ *
*读取字节的缓冲区,直到有没有更多阅读(-1)。
* /
ByteArrayBuffer BAF =新ByteArrayBuffer(5000);
INT电流= 0;
而((电流= bis.read())!= - 1){
baf.append((字节)电流);
}
/ *读取转换为字符串的字节数。 * /
FileOutputStream中FOS =新的FileOutputStream(文件);
fos.write(baf.toByteArray());
fos.flush();
fos.close();
Log.d(下载管理器,下载现成的+((System.currentTimeMillis的() - startTime时)/ 1000)+SEC);
}赶上(IOException异常E){
Log.d(下载管理,错误:+ E);
}
}
}
许可::
<使用-权限的Android:名称=android.permission.INTERNET对>< /使用-许可>
<使用-权限的Android:名称=android.permission.WRITE_EXTERNAL_STORAGE>< /使用-许可>
logcate ::
11月8号至11日:28:37.673:DEBUG / AndroidRuntime(7606):关闭虚拟机
11月8号至11号:28:37.673:DEBUG / dalvikvm(7606):调试器分离;对象注册了1项
11月8号至11号:28:38.223:DEBUG /下载管理器(7631):下载起始
11月8号至11号:28:38.223:DEBUG /下载管理器(7631):下载url:http://www.garyolsen.com/goclarke/digitalphotography/2006-2/NLechPortfolio/images/Fire%20Flower_jpg.jpg
11月8号至11号:28:38.233:DEBUG /下载管理器(7631):下载的文件名:火%20Flower_jpg.jpg
11月8号至11号:28:39.382:信息/国际(7631):在的BufferedInputStream的构造函数使用默认的缓冲区大小。这将是更好的是明确的,如果需要8K的缓冲区。
11月8号至11号:28:42.193:DEBUG / dalvikvm(7631):GC_FOR_MALLOC释放1181对象/ 146296字节在64ms内
11月8号至11号:28:45.552:DEBUG /下载管理器(7631):错误:java.io.FileNotFoundException:/mnt/sdcardmnt/sdcard/Fire%20Flower_jpg.jpg(没有这样的文件或目录)
11月8号至11号:28:45.672:信息/ ActivityManager(70):显示活动com.Downld_file_frm_net / .Downld_file_frm_net:8036毫秒(共8036毫秒)
11月8号至11号:28:50.802:DEBUG / dalvikvm(178):GC_EXPLICIT释放115对象/ 5224字节107ms
11月8号至11号:28:55.854:DEBUG / dalvikvm(190):GC_EXPLICIT释放733对象/ 40232字节119ms
解决方案
试试这个code
包com.Downld_file_frm_net;
进口java.io.BufferedInputStream中;
进口的java.io.File;
进口java.io.FileOutputStream中;
进口java.io.IOException异常;
进口的java.io.InputStream;
进口的java.net.URL;
进口java.net.URLConnection中;
进口org.apache.http.util.ByteArrayBuffer;
进口android.app.Activity;
进口android.os.Bundle;
进口android.util.Log;
公共类Downld_file_frm_net延伸活动{
/ **第一次创建活动时调用。 * /
@覆盖
公共无效的onCreate(包savedInstanceState){
super.onCreate(savedInstanceState);
的setContentView(R.layout.main);
//http://203.109.115.55/MRESC/images/150.jpg
DownloadFromUrl("http://www.garyolsen.com/goclarke/digitalphotography/2006-2/NLechPortfolio/images/Fire%20Flower_jpg.jpg","Fire%20Flower_jpg.jpg");
}
公共无效DownloadFromUrl(字符串DownloadUrl,字符串文件名){
尝试 {
文件DIR =新的文件(/ SD卡/ yourDir);
如果(dir.exists()== FALSE){
dir.mkdirs();
}
网址URL =新的URL(DownloadUrl); //你可以在这里写任何链接
档案文件=新的文件(目录,文件名);
长的startTime = System.currentTimeMillis的();
Log.d(下载管理器,下载开始时);
Log.d(下载管理器,下载网址:+网址);
Log.d(下载管理,已下载文件的名称:+文件名);
/ *打开到URL的连接。 * /
URLConnection的UCON = url.openConnection();
/ *
*定义InputStreams从URLConnection的阅读。
* /
InputStream的是= ucon.getInputStream();
的BufferedInputStream双=新的BufferedInputStream(是);
/ *
*读取字节的缓冲区,直到有没有更多阅读(-1)。
* /
ByteArrayBuffer BAF =新ByteArrayBuffer(5000);
INT电流= 0;
而((电流= bis.read())!= - 1){
baf.append((字节)电流);
}
/ *读取转换为字符串的字节数。 * /
FileOutputStream中FOS =新的FileOutputStream(文件);
fos.write(baf.toByteArray());
fos.flush();
fos.close();
Log.d(下载管理器,下载现成的+((System.currentTimeMillis的() - startTime时)/ 1000)+SEC);
}赶上(IOException异常E){
Log.d(下载管理,错误:+ E);
}
}
}
i want to store images in \mnt\sdcard
package com.Downld_file_frm_net;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
import org.apache.http.util.ByteArrayBuffer;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
public class Downld_file_frm_net extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//http://203.109.115.55/MRESC/images/150.jpg
DownloadFromUrl("http://www.garyolsen.com/goclarke/digitalphotography/2006-2/NLechPortfolio/images/Fire%20Flower_jpg.jpg","Fire%20Flower_jpg.jpg");
}
public void DownloadFromUrl(String DownloadUrl, String fileName) {
try {
File root = android.os.Environment.getExternalStorageDirectory();
File dir = new File (root.getAbsolutePath() + "mnt/sdcard/");
if(dir.exists()==false) {
dir.mkdirs();
}
URL url = new URL(DownloadUrl); //you can write here any link
File file = new File(dir, fileName);
long startTime = System.currentTimeMillis();
Log.d("DownloadManager", "download begining");
Log.d("DownloadManager", "download url:" + url);
Log.d("DownloadManager", "downloaded file name:" + fileName);
/* Open a connection to that URL. */
URLConnection ucon = url.openConnection();
/*
* Define InputStreams to read from the URLConnection.
*/
InputStream is = ucon.getInputStream();
BufferedInputStream bis = new BufferedInputStream(is);
/*
* Read bytes to the Buffer until there is nothing more to read(-1).
*/
ByteArrayBuffer baf = new ByteArrayBuffer(5000);
int current = 0;
while ((current = bis.read()) != -1) {
baf.append((byte) current);
}
/* Convert the Bytes read to a String. */
FileOutputStream fos = new FileOutputStream(file);
fos.write(baf.toByteArray());
fos.flush();
fos.close();
Log.d("DownloadManager", "download ready in" + ((System.currentTimeMillis() - startTime) / 1000) + " sec");
} catch (IOException e) {
Log.d("DownloadManager", "Error: " + e);
}
}
}
permission ::
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
logcate ::
08-11 11:28:37.673: DEBUG/AndroidRuntime(7606): Shutting down VM
08-11 11:28:37.673: DEBUG/dalvikvm(7606): Debugger has detached; object registry had 1 entries
08-11 11:28:38.223: DEBUG/DownloadManager(7631): download begining
08-11 11:28:38.223: DEBUG/DownloadManager(7631): download url:http://www.garyolsen.com/goclarke/digitalphotography/2006-2/NLechPortfolio/images/Fire%20Flower_jpg.jpg
08-11 11:28:38.233: DEBUG/DownloadManager(7631): downloaded file name:Fire%20Flower_jpg.jpg
08-11 11:28:39.382: INFO/global(7631): Default buffer size used in BufferedInputStream constructor. It would be better to be explicit if an 8k buffer is required.
08-11 11:28:42.193: DEBUG/dalvikvm(7631): GC_FOR_MALLOC freed 1181 objects / 146296 bytes in 64ms
08-11 11:28:45.552: DEBUG/DownloadManager(7631): Error: java.io.FileNotFoundException: /mnt/sdcardmnt/sdcard/Fire%20Flower_jpg.jpg (No such file or directory)
08-11 11:28:45.672: INFO/ActivityManager(70): Displayed activity com.Downld_file_frm_net/.Downld_file_frm_net: 8036 ms (total 8036 ms)
08-11 11:28:50.802: DEBUG/dalvikvm(178): GC_EXPLICIT freed 115 objects / 5224 bytes in 107ms
08-11 11:28:55.854: DEBUG/dalvikvm(190): GC_EXPLICIT freed 733 objects / 40232 bytes in 119ms
解决方案
try this code
package com.Downld_file_frm_net;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
import org.apache.http.util.ByteArrayBuffer;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
public class Downld_file_frm_net extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//http://203.109.115.55/MRESC/images/150.jpg
DownloadFromUrl("http://www.garyolsen.com/goclarke/digitalphotography/2006-2/NLechPortfolio/images/Fire%20Flower_jpg.jpg","Fire%20Flower_jpg.jpg");
}
public void DownloadFromUrl(String DownloadUrl, String fileName) {
try {
File dir = new File("/sdcard/yourDir");
if(dir.exists()==false) {
dir.mkdirs();
}
URL url = new URL(DownloadUrl); //you can write here any link
File file = new File(dir, fileName);
long startTime = System.currentTimeMillis();
Log.d("DownloadManager", "download begining");
Log.d("DownloadManager", "download url:" + url);
Log.d("DownloadManager", "downloaded file name:" + fileName);
/* Open a connection to that URL. */
URLConnection ucon = url.openConnection();
/*
* Define InputStreams to read from the URLConnection.
*/
InputStream is = ucon.getInputStream();
BufferedInputStream bis = new BufferedInputStream(is);
/*
* Read bytes to the Buffer until there is nothing more to read(-1).
*/
ByteArrayBuffer baf = new ByteArrayBuffer(5000);
int current = 0;
while ((current = bis.read()) != -1) {
baf.append((byte) current);
}
/* Convert the Bytes read to a String. */
FileOutputStream fos = new FileOutputStream(file);
fos.write(baf.toByteArray());
fos.flush();
fos.close();
Log.d("DownloadManager", "download ready in" + ((System.currentTimeMillis() - startTime) / 1000) + " sec");
} catch (IOException e) {
Log.d("DownloadManager", "Error: " + e);
}
}
}
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