android下载插件

package org.apache.cordova;

import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

import org.apache.cordova.api.Plugin;
import org.apache.cordova.api.PluginResult;
import org.json.JSONArray;
import org.json.JSONObject;

import android.graphics.Bitmap;
import android.graphics.Bitmap.CompressFormat;
import android.graphics.BitmapFactory;
import android.os.Environment;
import android.util.Log;

public class FileDownLoadPlugin extends Plugin {

private static final String ACTION_PIC = "pic";
private static final String STORE_PATH="wellapp/download/";

public PluginResult execute(String action, JSONArray data, String callBackId) {
//		FileDownLoadPlugin plugin = this;
PluginResult result = null;
try {
if (ACTION_PIC.equalsIgnoreCase(action)) {
String urlStr = data.getString(1)+"?picId="+data.getString(0);
Log.d("FileDownLoadPlugin execute", ACTION_PIC);
// this.showDatePicker(callBackId);
this.getImage(urlStr,data.getString(0)+".jpg");

JSONObject userChoice = new JSONObject();
userChoice.put("", "");
result = new PluginResult(PluginResult.Status.OK,userChoice);
result.setKeepCallback(true);
//				plugin.success(result, callBackId);
return result;
}
}catch(Exception e){
e.printStackTrace();
}
return null;
}

public byte[] getImage(String urlStr,String fileName) throws Exception {
Environment.getExternalStorageDirectory();
URL url = new URL(urlStr);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();// 基于HTTP协议的连接对象
conn.setConnectTimeout(5000);// 请求超时时间 5s
conn.setRequestMethod("GET");// 请求方式
Log.i("ResponseCode", "prepare");
Log.i("ResponseCode", conn.getResponseCode() + "");
if (conn.getResponseCode() == 200) {// 响应码==200 请求成功
InputStream inputStream = conn.getInputStream();// 得到输入流
Log.i("ResponseCode", inputStream.toString().length() + "");
ByteArrayOutputStream arrayOutputStream = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int len = 0;
Log.i("ResponseCode",
"inputStream.read(buffer) :" + inputStream.read(buffer)
+ "");
while ((len = inputStream.read(buffer)) != -1) {
arrayOutputStream.write(buffer, 0, len);
Log.i("ResponseCode", "buffer.length :" + buffer.length + "  "
+ len);
}
inputStream.close();

Log.i("ResponseCode", "arrayOutputStream.toByteArray().length :"
+ arrayOutputStream.toByteArray().length + "");

File extDir = Environment.getExternalStorageDirectory();
File fullFilename =new File(extDir,fileName);
if(!fullFilename.exists()){
fullFilename.mkdirs();
}
fullFilename.setWritable(Boolean.TRUE);
//			File imageFile = new File("BeautyGirl.txt");

FileOutputStream outStream = new FileOutputStream(fullFilename);
BufferedOutputStream bos = new BufferedOutputStream(outStream);
bos.write(arrayOutputStream.toByteArray());  //此步骤保存的jpg未能打开，提示已损坏...

//写入数据
//			 YuvImage yuvimage=new YuvImage(arrayOutputStream.toByteArray(), ImageFormat.NV21, 20,20, null);
//			 yuvimage.compressToJpeg(new Rect(0, 0,20, 20), 80, arrayOutputStream);
//	        outStream.write(arrayOutputStream.toByteArray());

//TODO 此处获取bitmap为空，未知原因，如何解决？？？
//	        Bitmap bitmap = BitmapFactory.decodeByteArray(arrayOutputStream.toByteArray(), 0,arrayOutputStream.toByteArray().length);
//	        bitmap.compress(CompressFormat.JPEG, 100, bos);

//关闭输出流
arrayOutputStream.close();
outStream.close();
}
return null;
}

}

/**
* 下载文件插件
*
* @author cjianquan
* @since 2014-07-18
*
*/
var FileDownLoad = function() {
};
FileDownLoad.prototype.downLoadFile = function(action, successCallback,
failureCallback,args) {
return PhoneGap.exec(successCallback, // Success callback from the plugin
failureCallback, // Error callback from the plugin
'FileDownLoadPlugin', // Tell PhoneGap to run "FileDownLoadPlugin" Plugin
action, // Tell plugin, which action we want to perform
args); // Passing list of args to the plugin
};

/**
*
*/

PhoneGap.addConstructor(function() {
// 如果不支持window.plugins,则创建并设置
if (!window.plugins) {
window.plugins = {};
}
window.plugins.FileDownLoadPlugin = new FileDownLoad();
// 向phonegap中注入插件相关的js
// Register the javascript plugin with PhoneGap
PhoneGap.addPlugin('FileDownLoadPlugin', new FileDownLoad());
// phonegap中注入后台插件相关的java类
// Register the native class of plugin with PhoneGap
PluginManager.addService("FileDownLoadPlugin",
"org.apache.cordova.FileDownLoadPlugin");
});