Question

我正在使用此方法从wallpaperURLStr下载图片：

  private class DownloadWallpaperTask extends AsyncTask<String, Integer, String> {

            @Override
            protected String doInBackground(String... params) {
                // TODO Auto-generated method stub
                String wallpaperURLStr = params[0];
                String localFileName = Integer.toString(wallpaperURLStr.hashCode());

                try {
                    File cacheDir = GlobalClass.instance().getCacheFolder(MainActivity.this);
                    File cacheFile = new File(cacheDir, localFileName);
                    if (!cacheFile.exists()) {
                        URL wallpaperURL = new URL(wallpaperURLStr);
                        URLConnection connection = wallpaperURL.openConnection();

                        //get file length
                        int filesize = connection.getContentLength();
                        if (filesize < 0) {
                            downloadProgressDialog.setMax(1000000);
                        } else {
                            downloadProgressDialog.setMax(filesize);
                        }

                        InputStream inputStream = new BufferedInputStream(wallpaperURL.openStream(), 10240);

                        FileOutputStream outputStream = new FileOutputStream(cacheFile);

                        byte buffer[] = new byte[1024];
                        int dataSize;
                        int loadedSize = 0;
                        while ((dataSize = inputStream.read(buffer)) != -1) {
                            loadedSize += dataSize;
                            publishProgress(loadedSize);
                            outputStream.write(buffer, 0, dataSize);
                        }

                        outputStream.close();
                    }
                } catch (MalformedURLException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }

                return localFileName;
            }

            protected void onProgressUpdate(Integer... progress) {
                downloadProgressDialog.setProgress(progress[0]);
            }

            protected void onPostExecute(String result) {
                downloadProgressDialog.hide();

                //open preview activity
                Bundle postInfo = new Bundle();
                postInfo.putString("localpath", result);

                if (previewPanelIntent == null) {
                    previewPanelIntent = new Intent(MainActivity.this,
                            PreviewPanel.class);
                }

                previewPanelIntent.putExtras(postInfo);
                startActivity(previewPanelIntent);
            }
        }

并将此方法保存在内部目录中：

public class GlobalClass {
    private static GlobalClass instance;
    private static final String applicationCacheFolder = "wallpaper_jms/cache/";
    private static final String applicationPicFolder = "wallpaper_jms/data/";

    public static GlobalClass instance() {
        if (instance == null) {
            instance = new GlobalClass();
        }
        return instance;
    }

    public File getCacheFolder(Context context) {
        File cacheDir = null;
        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
            cacheDir = new File(Environment.getExternalStorageDirectory() + "/" + Environment.DIRECTORY_DCIM + "/");
            if(!cacheDir.isDirectory()) {
                cacheDir.mkdirs();
            }
        }

        if(!cacheDir.isDirectory()) {
            cacheDir = context.getCacheDir(); //get system cache folder
        }

        return cacheDir;
    }

    public File getDataFolder(Context context) {
        File dataDir = null;
        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
            dataDir = new File(Environment.getExternalStorageDirectory() + "/" + Environment.DIRECTORY_DCIM + "/");
            if(!dataDir.isDirectory()) {
                dataDir.mkdirs();
            }
        }

        if(!dataDir.isDirectory()) {
            dataDir = context.getFilesDir();
        }

        return dataDir;
    }
}

我可以下载图片，但我无法将其保存在图库中。

这段代码出了什么问题？

提前致谢。

Answer 1

您需要将其广播到MediaScanner

sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED, Uri.parse("file://"+ Environment.getExternalStorageDirectory())));

结帐this Question

保存在android中的库中下载的图像

1 个答案: