我的问题是我有一个代码，假设接收一个变量，其中包含一个有图像的网站，所以这个变量每次发送新链接时都会更改，此代码应该联机并下载图像并将其保存到sd-card然后我读它并显示它
所以我的代码问题是如果我发送2个链接，它下载1个图像，它总是用第二个图像名称存储它（例如：im发送image1和image2代码下载image1两次并存储它作为“image2”）当我挂载SD卡并检查图像目录时只有1个图像名为image2，我认为doInBackground导致问题，但我也使用onPostExecute（）所以，如果有人可以帮助我我会感谢他的帮助请注意这就是我所说的： 注意：我的代码没有错误//没有红色标记 这就是所有代码：
private void UpdateAds(String Bookinfo,TextView myText){
elhgsdatabase db = new elhgsdatabase(this);
if (Bookinfo != "didn't read titels"){
String debContent="";
String output ="";
int NUMBEROFFIELDS = 5;
String s = addressString;
long idx;
String [] buffer = new String[NUMBEROFFIELDS];
output = "";
int l = 0;
while (s.indexOf("[")>-1){
int fk = s.indexOf("[");
int fl = s.indexOf("]");
if(fk > -1){
buffer[l] = s.substring(fk+1, fl);
s = s.substring(fl+1);
l++;
if (l == NUMBEROFFIELDS){
//1. Query the database to check if the book exists
//---get all titles---
db.open();
Cursor c = db.getBookTitle (buffer[0]);
if (c.getCount()==1)
{ myText.setText("This Books Exist \n"); }
else if(c.getCount()==0)
{ String locLink;
locLink = getLocalLink(buffer[3], buffer[0]);
c.moveToFirst();
if (!locLink.equalsIgnoreCase("-1")){
idx= db.insertTitle(buffer[0], buffer[1], buffer[2], getDate(buffer[3]), buffer[4], locLink);
}
else { //there was a problem with retrieval-saving of the Book info locally
myText.setText("There was a problem with retrieval-saving of the Book info locally\n");
}
}//if(c.getCount()==0)
else{//The table has two Books with the same Name. Do something
myText.setText("The table has two Books with the same Name\n");
}
c.close();
l = 0;
}//if(l == NUMBEROFFIELDS)
} //if (fk>-1)
}//while
db.close();
} //of if(BookInfo...
else {
myText.setText("Nothing is Done\n");
}
}
//This method gets the local link field of the active book records
// it goes on the web, gets the content and stores it in a place
// and saves the path of that place in the database for that
//it returns -1 if something wrong happened during the process
public String getLocalLink(String image_URL, String BookName){
/** This is what we do with this method:
* Go online, according to the link, get the content, call the method to save, get the local link
* and return it
*/
setContentView(R.layout.main);
reviewImageLink = image_URL;
URL reviewImageURL;
String name = reviewImageLink.substring(reviewImageLink.lastIndexOf("/") + 1);
try {
reviewImageURL = new URL(reviewImageLink);
if (!hasExternalStoragePublicPicture(name)) {
isImage = false;
new DownloadImageTask().execute(reviewImageURL);
Log.v("log_tag", "if");
isImage = true;
File sdImageMainDirectory = new File(Environment.getExternalStorageDirectory(), getResources()
.getString(R.string.directory));
sdImageMainDirectory.mkdirs();
File file = new File(sdImageMainDirectory, name);
Log.v("log_tag", "Directory created");
}
} catch (MalformedURLException e) {
Log.v(TAG, e.toString());
}
return ("/sdcard/Hanud/"+BookName+".jpg");
}
private class DownloadImageTask extends AsyncTask<URL, Integer, Bitmap> {
// This class definition states that DownloadImageTask will take String
// parameters, publish Integer progress updates, and return a Bitmap
protected Bitmap doInBackground(URL... paths) {
URL url;
try {
url = paths[0];
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
int length = connection.getContentLength();
InputStream is = (InputStream) url.getContent();
byte[] imageData = new byte[length];
int buffersize = (int) Math.ceil(length / (double) 100);
int downloaded = 0;
int read;
while (downloaded < length) {
if (length < buffersize) {
read = is.read(imageData, downloaded, length);}
else if ((length - downloaded) <= buffersize) {
read = is.read(imageData, downloaded, length- downloaded);
}
else {read = is.read(imageData, downloaded, buffersize);}
downloaded += read;
publishProgress((downloaded * 100) / length);
}
Bitmap bitmap = BitmapFactory.decodeByteArray(imageData, 0,
length);
if (bitmap != null) {
Log.i(TAG, "Bitmap created");
} else {
Log.i(TAG, "Bitmap not created");
}
is.close();
return bitmap;
} catch (MalformedURLException e) {
Log.e(TAG, "Malformed exception: " + e.toString());
} catch (IOException e) {
Log.e(TAG, "IOException: " + e.toString());
} catch (Exception e) {
Log.e(TAG, "Exception: " + e.toString());
}
return null;
}
protected void onPostExecute(Bitmap result) {
String name = reviewImageLink.substring(reviewImageLink
.lastIndexOf("/") + 1);
if (result != null) {
hasExternalStoragePublicPicture(name);
saveToSDCard(result, name);
isImage = true;
} else {
isImage = false;
}
}
}
public void saveToSDCard(Bitmap bitmap, String name) {
boolean mExternalStorageAvailable = false;
boolean mExternalStorageWriteable = false;
String state = Environment.getExternalStorageState();
if (Environment.MEDIA_MOUNTED.equals(state)) {
mExternalStorageAvailable = mExternalStorageWriteable = true;
Log.v(TAG, "SD Card is available for read and write "
+ mExternalStorageAvailable + mExternalStorageWriteable);
saveFile(bitmap, name);
} else if (Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) {
mExternalStorageAvailable = true;
mExternalStorageWriteable = false;
Log.v(TAG, "SD Card is available for read "
+ mExternalStorageAvailable);
} else {
mExternalStorageAvailable = mExternalStorageWriteable = false;
Log.v(TAG, "Please insert a SD Card to save your Video "
+ mExternalStorageAvailable + mExternalStorageWriteable);
}
}
private void saveFile(Bitmap bitmap, String name) {
String filename = name;
ContentValues values = new ContentValues();
File sdImageMainDirectory = new File(Environment
.getExternalStorageDirectory(), getResources().getString(
R.string.directory));
sdImageMainDirectory.mkdirs();
File outputFile = new File(sdImageMainDirectory, filename);
values.put(MediaStore.MediaColumns.DATA, outputFile.toString());
values.put(MediaStore.MediaColumns.TITLE, filename);
values.put(MediaStore.MediaColumns.DATE_ADDED, System
.currentTimeMillis());
values.put(MediaStore.MediaColumns.MIME_TYPE, "image/png");
Uri uri = this.getContentResolver().insert(
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
values);
try {
OutputStream outStream = this.getContentResolver()
.openOutputStream(uri);
bitmap.compress(Bitmap.CompressFormat.PNG, 95, outStream);
outStream.flush();
outStream.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
private boolean hasExternalStoragePublicPicture(String name) {
File sdImageMainDirectory = new File(Environment
.getExternalStorageDirectory(), getResources().getString(
R.string.directory));
File file = new File(sdImageMainDirectory, name);
if (file != null) {
file.delete();
}
return file.exists();
}
public void showAllBooks( )
{
final elhgsdatabase db = new elhgsdatabase(this);
Handler handler = new Handler();
handler.postDelayed(new Runnable() {
public void run() {
// Get new entry
db.open();
long currTime = System.currentTimeMillis();
String p_query = "select * from ads where timeFrom<=?";
Cursor c = db.rawQuery(p_query, new String[] { Long.toString(currTime)});
if (c.moveToFirst())
{
do {
DisplayTitle(c);
} while (c.moveToNext());
}
db.close();
}
}, 5000); // 5000 miliseconds
}
public long getDate(String s){
String[] formats = new String[] {
"yyyy-MM-dd HH:mm:ss"
};
SimpleDateFormat sdf=null;
String st;
for (String format : formats) {
sdf = new SimpleDateFormat(format, Locale.US);
sdf.setTimeZone(TimeZone.getTimeZone("EST"));//UTC or EST
st = new String(sdf.format(new Date(0)));
System.err.format(format, st);
}
Calendar c = Calendar.getInstance();
Date dt;
try {
dt = sdf.parse(s);
c.setTime(dt);
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return c.getTimeInMillis() ;
}
public void DisplayTitle(final Cursor c)
{
Toast.makeText(this,
"Title: " + c.getString(0) + "\n" +
"isbn: " + c.getString(1) + "\n" +
"Publisher: " + c.getString(2) + "\n" +
"Year: " + c.getString(3) + "\n" +
"Image On Line: " + c.getString(4) + "\n" +
"Image On SD " + c.getString(5) + "\n" ,
Toast.LENGTH_LONG).show();
String imageInSD = c.getString(5);
Bitmap bitmap = BitmapFactory.decodeFile(imageInSD);
myImageView=(ImageView)findViewById(R.id.imageview1);
myImageView.setImageBitmap(bitmap);
}
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答案 0 :(得分：1)
我很确定你将第二个图像名称设置为reviewImageLink（不确定这是一个类变量还是什么）变量。相反，尝试将两者 URL和String传递给AsyncTask。而不是传递URL ...传入一个Object ...其中第一个是URL，第二个是名称，并在onPostExecute中使用它。
答案 1 :(得分：0)
您没有显示ImageLink的设置方式。但是由于文件名是由它构造的，我猜你的问题几乎与你在这里展示的代码无关。