Android 将文件从url下载到sdk卡中_Android_Cordova

Android 将文件从url下载到sdk卡中

android cordova

Android 将文件从url下载到sdk卡中,android,cordova,Android,Cordova,我正在与android项目合作phonegap。我想从url下载一个文件到我的sdk卡中这是我的Downloader.java package com.example.pgplugins.downloaderPlugin; import org.json.JSONArray; import org.json.JSONException; import android.util.Log; import com.phonegap.DroidGap; import com.phonegap.ap

我正在与android项目合作phonegap。我想从url下载一个文件到我的sdk卡中

这是我的Downloader.java

package com.example.pgplugins.downloaderPlugin;
import org.json.JSONArray;
import org.json.JSONException;

import android.util.Log;

import com.phonegap.DroidGap;
import com.phonegap.api.Plugin;
import com.phonegap.api.PluginResult;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

public class Downloader extends Plugin{

 @Override
 public PluginResult execute(String action, JSONArray args, String callbackId) {
 if (action.equals("downloadFile")) {
 try {
 return this.downloadUrl(args.getString(0),args.getString(1),args.getString(2),args.getString(3));
 } catch (JSONException e) {
 return new PluginResult(PluginResult.Status.ERROR, "Param errrors");
 }
 }
 else {
 return new PluginResult(PluginResult.Status.INVALID_ACTION);
 }

 }

 private PluginResult downloadUrl(String fileUrl, String dirName, String fileName, String overwrite){
 try{
 Log.d("DownloaderPlugin", "DIRECTORY CALLED /sdcard/"+dirName+" created");
 File dir =     new File("/sdcard/"+dirName);
 if(!dir.exists()){
 Log.d("DownloaderPlugin", "directory /sdcard/"+dirName+" created");
 dir.mkdirs();
 }

 File file = new File("/sdcard/"+dirName+fileName);

 if(overwrite.equals("false") && file.exists()){
 Log.d("DownloaderPlugin", "File already exist");
 return new PluginResult(PluginResult.Status.OK, "exist");
 }

 URL url = new URL(fileUrl);
 HttpURLConnection ucon = (HttpURLConnection) url.openConnection();
 ucon.setRequestMethod("GET");
 ucon.setDoOutput(true);
 ucon.connect();

 Log.d("DownloaderPlugin", "download begining");

 Log.d("DownloaderPlugin", "download url:" + url);

 InputStream is = ucon.getInputStream();

 byte[] buffer = new byte[1024];

 int len1 = 0;

 FileOutputStream fos = new FileOutputStream(file);

 while ( (len1 = is.read(buffer)) > 0 ) {
 fos.write(buffer,0, len1);
 }

 fos.close();

 Log.d("DownloaderPlugin", "Download complete in" + fileName);

 } catch (IOException e) {

 Log.d("DownloaderPlugin", "Error: " + e);
 return new PluginResult(PluginResult.Status.ERROR, "Error: " + e);

 }

 return new PluginResult(PluginResult.Status.OK, fileName);

 }

}

这是我的Downloader.js

function Downloader() {

}

Downloader.prototype.downloadFile = function(fileUrl,dirName,fileName,overwrite,win,fail) {
 if(overwrite==false) overwrite="false";
 else overwrite="true";
 PhoneGap.exec(win, fail, "Downloader", "downloadFile", [fileUrl,dirName,fileName,overwrite]);

};

PhoneGap.addConstructor(function() {
 PhoneGap.addPlugin("downloader", new Downloader());
 PluginManager.addService("Downloader","com.example.pgplugins.downloaderPlugin.Downloader");
});

这是我的index.html

<!DOCTYPE HTML>
<html>
  <head>
    <meta name="viewport" content="width=320; user-scalable=no" />
    <meta http-equiv="Content-type" content="text/html; charset=utf-8">
    <title>PhoneGap Demo With JQuery Mobile</title>
      <link rel="stylesheet" href="jquery.mobile/jquery.mobile-1.0b2.css" type="text/css" charset="utf-8" />
      <link rel="stylesheet" href="pgandjqm-style-override.css" type="text/css" charset="utf-8" />
      <script type="text/javascript" src="jquery.mobile/jquery-1.6.2.min"></script>
      <script type="text/javascript" charset="utf-8" src="phonegap-1.0.0.js"></script>
      <script src="jquery.mobile/jquery.mobile-1.0b2.js"></script>
      <script type="text/javascript" charset="utf-8" src="main.js"></script>

    <!-- CDN Respositories: For production, replace lines above with these uncommented minified versions -->
    <!-- <link rel="stylesheet" href="http://code.jquery.com/mobile/1.0b2/jquery.mobile-1.0b2.min.css" />-->
    <!-- <script src="http://code.jquery.com/jquery-1.6.2.min.js"></script>-->
    <!-- <script src="http://code.jquery.com/mobile/1.0b2/jquery.mobile-1.0b2.min.js"></script>-->
    script type="text/javascript" charset="utf-8" src="downloader.js"></script>
 <script type="text/javascript">

 window.plugins.downloader.downloadFile("http://www.toforge.com/archive.zip","sdcard/cache/","archive.zip", false,
 function(data){
 if(data=="exist"){
 alert("File already exist");
 }
 else{
 alert("File saved on sd card")
 }
 },function(data){ alert("error: "+data); });

 </script>
    </head>
  <body onload="init();">

  </body>
</html>


使用JQuery Mobile的PhoneGap演示
script type=“text/javascript”charset=“utf-8”src=“downloader.js”>
window.plugins.downloader.downloadFile（“http://www.toforge.com/archive.zip“，“sdcard/cache/”，“archive.zip”，false，
功能（数据）{
如果（数据==“存在”）{
警报（“文件已存在”）；
}
否则{
警报（“文件保存在sd卡上”）
}
}，函数（数据）{alert（“error:+data）；}）；

每当我运行那个程序时，就会出现这个错误，这意味着我得不到任何结果

错误：-强制关闭程序

我的程序未运行。意味着在开始运行之前，会发生暂停。请检查我的代码并帮助我找出错误。

如果要使用带有通知的服务在后台下载文件，请检查此项

我希望这会对您有所帮助。

这是logcat中发生的错误：-07-26 16:48:55.328:DEBUG/AndroidRuntime（275）：关闭VM 07-26 16:48:55.328:WARN/dalvikvm（275）：threadid=1：线程退出时出现未捕获异常（组=0x4001d800）07-26 16:48:55.435:error/AndroidRuntime（275）：致命异常：main 07-26 16:48:55.435:错误/AndroidRuntime（275）：java.lang.RuntimeException:无法在执行它停止的任何函数之前实例化activitymeans。