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java – 无法将图像保存到SD卡
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![java – 无法将图像保存到SD卡](/upload/InfoBanner/zyjiaocheng/697/6e76b4eb9ab545eb8014b4a0f34b9cee.jpg)
我尝试使用此代码下载图像并保存:
在这一行:
OutputStream os =new FileOutputStream(f);
我在模拟器上尝试它.我的应用得到例外,没有权限保存到此路径:
java.io.FileNotFoundException: /mnt/sdcard/InterFlora/1221618532: open failed: EACCES (Permission denied)
我还添加了这一行:
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
这是代码:
RetreiveImage extends AsyncTask<String, Void,Bitmap> {
Item m_item;
File f;
public RetreiveImage(Item aItem , File aFile){
m_item = aItem;
f = File (m_Sdcard.getAbsolutePath() + "/myFolder");
}
@Override
protected Bitmap doInBackground(String... params) {
try
{
Bitmap bitmap=null;
InputStream is=new URL(m_item.small).openStream();
OutputStream os =new FileOutputStream(f);
os.close();
return bitmap;
}
catch (MalformedURLException e) {
return null;
} catch (IOException e) {
return null;
}
}
}
编辑
File m_Sdcard = Environment.getExternalStorageDirectory();
File cacheDir =new File (m_Sdcard.getAbsolutePath() + "/MyFolder");
if(!cacheDir.exists())
cacheDir.mkdirs();
解决方法:
Try this works..
import java.io.BufferedInputStream;
import java.io.File;
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.app.Dialog;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class main extends Activity {
/** Called when the activity is first created. */
public static final int DIALOG_DOWNLOAD_PROGRESS = 0;
private Button startBtn;
private ProgressDialog mProgressDialog;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
startBtn = (Button)findViewById(R.id.startBtn);
startBtn.setOnClickListener(new OnClickListener(){
public void onClick(View v) {
startDownload();
}
});
}
private void startDownload() {
String url = "http://farm1.static.flickr.com/114/298125983_0e4bf66782_b.jpg";
new DownloadFileAsync().execute(url);
}
@Override
protected Dialog onCreateDialog(int id) {
switch (id) {
case DIALOG_DOWNLOAD_PROGRESS:
mProgressDialog = new ProgressDialog(this);
mProgressDialog.setMessage("Downloading file..");
mProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
mProgressDialog.setCancelable(false);
mProgressDialog.show();
return mProgressDialog;
default:
return null;
}
}
class DownloadFileAsync extends AsyncTask<String, String, String> {
@Override
protected void onPreExecute() {
super.onPreExecute();
showDialog(DIALOG_DOWNLOAD_PROGRESS);
}
@Override
protected String doInBackground(String... aurl) {
int count;
try {
URL url = new URL(aurl[0]);
URLConnection conexion = url.openConnection();
conexion.connect();
int lenghtOfFile = conexion.getContentLength();
Log.d("ANDRO_ASYNC", "Lenght of file: " + lenghtOfFile);
FileOutputStream obj;
InputStream input = new BufferedInputStream(url.openStream());
//obj=openFileOutput("some_photo_from_gdansk_poland.jpg", Context.MODE_PRIVATE);
String Path="/sdcard/";//"/data/data/com.server/";
OutputStream output = new FileOutputStream(Path+"some_photo_from_gdansk_poland.jpg");//obj
byte data[] = new byte[1024];
long total = 0;
while ((count = input.read(data)) != -1) {
total += count;
publishProgress(""+(int)((total*100)/lenghtOfFile));
output.write(data, 0, count);
}
output.flush();
output.close();
input.close();
} catch (Exception e) {}
return null;
}
protected void onProgressUpdate(String... progress) {
Log.d("ANDRO_ASYNC",progress[0]);
mProgressDialog.setProgress(Integer.parseInt(progress[0]));
}
@Override
protected void onPostExecute(String unused) {
dismissDialog(DIALOG_DOWNLOAD_PROGRESS);
}
}
}
and add android.permission.WRITE_EXTERNAL_STORAGE
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