你好，我使用了下面的代码，我在 android 应用程序的 android 3.0 平板电脑模拟器中运行项目，我得到路径 /mnt/sdcard/ 但没有得到完整路径。如何解决它？请帮助我！！下面是我的代码
![package com.hope.project;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileFilter;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;
import java.net.URLConnection;
import android.app.Activity;
import android.content.Context;
import android.content.IntentFilter;
import android.content.SharedPreferences;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity {
WebView myWebView;
TextView mDisplay;
AsyncTask<Void, Void, Void> mRegisterTask;
String name;
String Message;
String deviceId;
String regId;
IntentFilter gcmFilter;
SharedPreferences sharedPref;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myWebView = (WebView) findViewById(R.id.webView1);
final JavaScriptInterface myJavaScriptInterface = new JavaScriptInterface(
this);
myWebView.addJavascriptInterface(myJavaScriptInterface,
"AndroidFunction");
WebSettings settings = myWebView.getSettings();
settings.setJavaScriptEnabled(true);
settings.setDatabaseEnabled(true);
settings.setDomStorageEnabled(true);
settings.setAllowFileAccess(true);
settings.setBuiltInZoomControls(true);
settings.setUseWideViewPort(true);
settings.setJavaScriptCanOpenWindowsAutomatically(true);
settings.setLoadWithOverviewMode(true);
myWebView.setScrollBarStyle(WebView.SCROLLBARS_OUTSIDE_OVERLAY);
myWebView.setWebViewClient(new WebViewClient() {
public boolean shouldOverrideUrlLoading(WebView view, String url) {
// handle stuff here
// e.g. view.loadUrl(url);
Log.v("log", " on ovverRide " + url);
return true;
}
public void onPageFinished(WebView view, String url) {
// dismiss the indeterminate progress dialog
Log.v("log", "onPageFinished: " + url);
myWebView.setEnabled(false);
}
});
myWebView.loadUrl("file:///android_asset/www/index.html");
/* File urlName= Environment.getExternalStorageDirectory().getAbsoluteFile();
Log.v("log_tag", "urlNameDownload "+urlName);*/
/* File file\[\] = Environment.getExternalStorageDirectory().listFiles();
for (File f : file)
{
if (f.isDirectory()) {
String uri=f.getPath().substring(f.getPath().lastIndexOf("/") + 1);
Log.v("Name", uri);
Log.v("Name", f.getPath()+ "");
Log.v("Name", f.getAbsolutePath()+ "");
}
}*/
File dir = new File("mnt/sdcard/");
File\[\] files = (new File("mnt/sdcard/")).listFiles();
// This filter only returns directories
FileFilter dirFilter = new FileFilter() {
public boolean accept(File dir) {
return dir.isDirectory();
}
};
files = dir.listFiles(dirFilter);
for (int i=0; i<files.length; i++) {
if(files\[i\].getAbsolutePath().contains("Download"))
Log.v("log_tag","directory path : " + files\[i\].getAbsolutePath().substring(files\[i\].getAbsolutePath().lastIndexOf("/") +1));
}
}
protected void onDestroy() {
super.onDestroy();
}
public class JavaScriptInterface {
Context mContext;
JavaScriptInterface(Context c) {
mContext = c;
}
public void DownloadUrl(String url) {
Log.v("log", "login main url " + url);
String file_url = url;
new DownloadFileFromURL().execute(file_url);
/*
* String url_new = "http://"+url; Intent i = new
* Intent(Intent.ACTION_VIEW); i.setData(Uri.parse(url_new));
* startActivity(i);
*/
}
}
class DownloadFileFromURL extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Bar Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
// showDialog(progress_bar_type);
}
/**
* Downloading file in background thread
* */
@Override
protected String doInBackground(String... f_url) {
int count;
Log.v("log", "login main url\[0\] " + f_url\[0\]);
try {
URL url = new URL(f_url\[0\]);
name = f_url\[0\].substring(f_url\[0\].lastIndexOf("/") + 1);
URLConnection conection = url.openConnection();
conection.connect();
// getting file length
int lenghtOfFile = conection.getContentLength();
// input stream to read file - with 8k buffer
InputStream input = new BufferedInputStream(url.openStream(),
8192);
// Output stream to write file
// OutputStream output = new
// FileOutputStream("/sdcard/downloadedfile.jpg");
OutputStream output = new FileOutputStream(
Environment.getExternalStorageDirectory() + "/Download/" + name);
// OutputStream output = new
// FileOutputStream("/sdcard/downloadedUrl.mp4");
byte data\[\] = new byte\[1024\];
long total = 0;
while ((count = input.read(data)) != -1) {
total += count;
// publishing the progress....
// After this onProgressUpdate will be called
publishProgress("" + (int) ((total * 100) / lenghtOfFile));
// writing data to file
output.write(data, 0, count);
}
// flushing output
output.flush();
// closing streams
output.close();
input.close();
} catch (Exception e) {
Log.e("Error: ", e.getMessage());
}
return null;
}
/**
* Updating progress bar
* */
protected void onProgressUpdate(String... progress) {
// setting progress percentage
// pDialog.setProgress(Integer.parseInt(progress\[0\]));
}
/**
* After completing background task Dismiss the progress dialog
* **/
@Override
protected void onPostExecute(String file_url) {
// dismiss the dialog after the file was downloaded
// dismissDialog(progress_bar_type);
// Displaying downloaded image into image view
// Reading image path from sdcard
/*
* Log.v("log","login main url\[0\] " +
* Environment.getExternalStorageDirectory().toString()); String
* videoPath = Environment.getExternalStorageDirectory() +"/"+name;
* Intent i = new Intent(MainActivity.this,
* VideoPlayActivity.class); i.putExtra("videoPath", videoPath);
* startActivity(i);
*/
Toast.makeText(MainActivity.this, "DownLoad Is Completed",
Toast.LENGTH_LONG).show();
}
}
}
