phonegap 文件下载
效果图：
package com.phonegap.plugins.downloader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
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.JSONException;
import org.json.JSONObject;
import android.os.Environment;
import android.util.Log;
public class Downloader extends Plugin {
@Override
public PluginResult execute(String action, JSONArray args, String callbackId) {
if (!action.equals("downloadFile"))
return new PluginResult(PluginResult.Status.INVALID_ACTION);
try {
String fileUrl = args.getString(0);
JSONObject params = args.getJSONObject(1);
String fileName = params.has("fileName") ? params
.getString("fileName") : fileUrl.substring(fileUrl
.lastIndexOf("/") + 1);
String dirName = params.has("dirName") ? params
.getString("dirName") : Environment
.getExternalStorageDirectory().getPath() + "/download";
Boolean overwrite = params.has("overwrite") ? params
.getBoolean("overwrite") : false;
return this.downloadUrl(fileUrl, dirName, fileName, overwrite,
callbackId);
} catch (JSONException e) {
e.printStackTrace();
return new PluginResult(PluginResult.Status.JSON_EXCEPTION,
e.getMessage());
} catch (InterruptedException e) {
e.printStackTrace();
return new PluginResult(PluginResult.Status.ERROR, e.getMessage());
}
}
private PluginResult downloadUrl(String fileUrl, String dirName,
String fileName, Boolean overwrite, String callbackId)
throws InterruptedException, JSONException {
try {
Log.d("PhoneGapLog", "Downloading " + fileUrl + " into " + dirName
+ "/" + fileName);
File dir = new File(dirName);
if (!dir.exists()) {
Log.d("PhoneGapLog", "directory " + dirName + " created");
dir.mkdirs();
}
File file = new File(dirName, fileName);
if (!overwrite && file.exists()) {
Log.d("DownloaderPlugin", "File already exist");
JSONObject obj = new JSONObject();
obj.put("status", 1);
obj.put("total", 0);
obj.put("file", fileName);
obj.put("dir", dirName);
obj.put("progress", 100);
return new PluginResult(PluginResult.Status.OK, obj);
}
URL url = new URL(fileUrl);
HttpURLConnection ucon = (HttpURLConnection) url.openConnection();
ucon.setRequestMethod("GET");
ucon.connect();
Log.d("PhoneGapLog", "Download start");
InputStream is = ucon.getInputStream();
byte[] buffer = new byte[1024];
int readed = 0, progress = 0, totalReaded = 0, fileSize = ucon
.getContentLength();
FileOutputStream fos = new FileOutputStream(file);
while ((readed = is.read(buffer)) > 0) {
fos.write(buffer, 0, readed);
totalReaded += readed;
int newProgress = (int) (totalReaded * 100 / fileSize);
if (newProgress != progress)
progress = informProgress(fileSize, newProgress, dirName,
fileName, callbackId);
}
fos.close();
Log.d("PhoneGapLog", "Download finished");
JSONObject obj = new JSONObject();
obj.put("status", 1);
obj.put("total", fileSize);
obj.put("file", fileName);
obj.put("dir", dirName);
obj.put("progress", progress);
return new PluginResult(PluginResult.Status.OK, obj);
} catch (FileNotFoundException e) {
Log.d("PhoneGapLog", "File Not Found: " + e);
return new PluginResult(PluginResult.Status.ERROR, 404);
} catch (IOException e) {
Log.d("PhoneGapLog", "Error: " + e);
return new PluginResult(PluginResult.Status.ERROR, e.getMessage());
}
}
private int informProgress(int fileSize, int progress, String dirName,
String fileName, String callbackId) throws InterruptedException,
JSONException {
JSONObject obj = new JSONObject();
obj.put("status", 0);
obj.put("total", fileSize);
obj.put("file", fileName);
obj.put("dir", dirName);
obj.put("progress", progress);
PluginResult res = new PluginResult(PluginResult.Status.OK, obj);
res.setKeepCallback(true);
success(res, callbackId);
// Give a chance for the progress to be sent to javascript
Thread.sleep(100);
return progress;
}
}
function Downloader() {
}
Downloader.prototype.downloadFile = function(fileUrl, params, win, fail) {
// Make params hash optional.
if (!fail)
win = params;
cordova.exec(win, fail, "Downloader", "downloadFile", [ fileUrl, params ]);
};
window.downloader = new Downloader();
PhonegapTest
