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我有一些代码需要一组 url，我有一个用于文件名。url 被输入到异步下载任务中，文件名应该是它们在 SD 卡上的命名和保存方式。我相信它会尝试下载从微调器中选择的文件，但它们根本没有保存在 SD 卡上。此外，似乎我的进度条没有填充，它显示但保持为零。我假设它正在尝试下载的唯一原因是因为它位于文件进度条上的时间长度，有些长有些短。

这是代码：

public class SpinnerActivity extends Activity {

public static final int DIALOG_DOWNLOAD_PROGRESS = 0;
private ProgressDialog mProgressDialog;

Spinner spDownloadFrom;
private ArrayAdapter<CharSequence> spinnerArrayAdapter;
String url[] = {"http://www.becker.cl/bases.pdf",
        "http://www.pitt.edu/documents/campusmap0607.pdf", "http://www.aara.ca/reg3317/web_page_doc.pdf",
        "www.dataprotection.ie/documents/guidance/GuidanceFinance.pdf", "http://www.fmbb2012.com/JumpingQualifica1.pdf",
        "http://www.consulatdumaroc.ca/coloniefh22012.pdf", "http://www.rgrdlaw.com/media/cases/140_Complaint.pdf" };
String name[] = {"bases.pdf", "campusmap0607.pdf", "web_page_doc.pdf", "GuidanceFinance.pdf",
        "JumpingQualifica1.pdf", "coloniefh22012.pdf", "140_Complaint.pdf", };

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    mProgressDialog = new ProgressDialog(SpinnerActivity.this);
    mProgressDialog.setMessage("Please be patient, file downloading...");
    mProgressDialog.setIndeterminate(false);
    mProgressDialog.setMax(100);
    mProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);

    spDownloadFrom = (Spinner) findViewById(R.id.Spinner01);

    spinnerArrayAdapter = new ArrayAdapter<CharSequence>(this,
            android.R.layout.simple_spinner_item, name);
    spinnerArrayAdapter
            .setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    spDownloadFrom.setAdapter(spinnerArrayAdapter);

    spDownloadFrom.setOnItemSelectedListener(new SpinnerListener(
            spDownloadFrom));
}

public class SpinnerListener implements OnItemSelectedListener {
    Spinner sp;

    public SpinnerListener(View v) {
        sp = (Spinner) findViewById(v.getId());
    }

    @Override
    public void onItemSelected(AdapterView<?> parent, View v, int arg2,
            long arg3) {
        // Call to download class
        startDownload(arg2);


    }

    @Override
    public void onNothingSelected(AdapterView<?> arg0) {
        // TODO Auto-generated method stub

    }
}

private void startDownload(int position) {
    DownloadFile downloadFile = new DownloadFile();
    downloadFile.execute(url[position]);
}

class DownloadFile extends AsyncTask<String, Integer, String> { // put your
                                                                // download
                                                                // code

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        mProgressDialog.show();
    }

    @Override
    protected void onProgressUpdate(Integer... progress) {
        super.onProgressUpdate(progress);
        mProgressDialog.setProgress(progress[0]);
    }

    @Override
    protected String doInBackground(String... aurl) {
        try {

            URL url = new URL(aurl[0]);
            URLConnection connection = url.openConnection();

            connection.connect();
            int fileLength = connection.getContentLength();
            int tickSize = 2 * fileLength / 100;
            int nextProgress = tickSize;

            Log.d(

            "ANDRO_ASYNC", "Lenght of file: " + fileLength);

            InputStream input = new BufferedInputStream(url.openStream());

            String path = Environment.getExternalStorageDirectory()
                    + "/Android/Data/"
                    + getApplicationContext().getPackageName() + "/files/" + name;
            File file = new File(path);
            file.mkdirs();
            File outputFile = file;

            OutputStream output = new FileOutputStream(outputFile);

            byte data[] = new byte[1024 * 1024];
            long total = 0;
            int count;
            while ((count = input.read(data)) != -1) {
                total += count;
                if (total >= nextProgress) {
                    nextProgress = (int) ((total / tickSize + 1) * tickSize);
                    this.publishProgress((int) (total * 100 / fileLength));
                }
                output.write(data, 0, count);
            }

            output.flush();
            output.close();
            input.close();
            mProgressDialog.dismiss();

        } catch (Exception e) {
        }
        return null;
    }

    protected void onProgressUpdate(String... progress) {
        Log.d("Downloading", progress[0]);

    }

    @Override
    protected void onPostExecute(String unused) {

        mProgressDialog.dismiss();

        File file = new File(Environment.getExternalStorageDirectory()
                + "/Android/Data/"
                + getApplicationContext().getPackageName()
                + "/files/" + name);
        Intent testIntent = new Intent(Intent.ACTION_VIEW);
        testIntent.setType("application/pdf");
        Intent intent = new Intent();
        intent.setAction(Intent.ACTION_VIEW);
        Uri uri = Uri.fromFile(file);
        intent.setDataAndType(uri, "application/pdf");
        try {
            startActivity(intent);
        } catch (ActivityNotFoundException e) {
            Toast.makeText(SpinnerActivity.this,
                    "No Application Available to View PDF",
                    Toast.LENGTH_LONG).show();
        }
    }
}
}

除了打印到 LogCat 之外，这里是收到的错误：

05-06 00:23:39.087: E/Spinner(13841): exception
05-06 00:23:39.087: E/Spinner(13841): java.io.FileNotFoundException:     /mnt/sdcard/Android/Data/com.hellospinner/files/[Ljava.lang.String;@40517468 (Is a     directory)
05-06 00:23:39.087: E/Spinner(13841):   at     org.apache.harmony.luni.platform.OSFileSystem.open(Native Method)
05-06 00:23:39.087: E/Spinner(13841):   at     dalvik.system.BlockGuard$WrappedFileSystem.open(BlockGuard.java:232)
05-06 00:23:39.087: E/Spinner(13841):   at java.io.FileOutputStream.<init>    (FileOutputStream.java:94)
05-06 00:23:39.087: E/Spinner(13841):   at java.io.FileOutputStream.<init>    (FileOutputStream.java:66)
05-06 00:23:39.087: E/Spinner(13841):   at     com.hellospinner.SpinnerActivity$DownloadFile.doInBackground(SpinnerActivity.java:    131)
05-06 00:23:39.087: E/Spinner(13841):   at     com.hellospinner.SpinnerActivity$DownloadFile.doInBackground(SpinnerActivity.java:    1)
05-06 00:23:39.087: E/Spinner(13841):   at     android.os.AsyncTask$2.call(AsyncTask.java:185)
05-06 00:23:39.087: E/Spinner(13841):   at     java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306)
05-06 00:23:39.087: E/Spinner(13841):   at     java.util.concurrent.FutureTask.run(FutureTask.java:138)
05-06 00:23:39.087: E/Spinner(13841):   at     java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)
05-06 00:23:39.087: E/Spinner(13841):   at     java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)
05-06 00:23:39.087: E/Spinner(13841):   at java.lang.Thread.run(Thread.java:1019)

固定代码：

public class SpinnerActivity extends Activity {

public static final int DIALOG_DOWNLOAD_PROGRESS = 0;
private ProgressDialog mProgressDialog;

Spinner spDownloadFrom;
private ArrayAdapter<CharSequence> spinnerArrayAdapter;
String url[] = {
        "http://www.becker.cl/bases.pdf",
        "http://www.pitt.edu/documents/campusmap0607.pdf",
        "http://www.aara.ca/reg3317/web_page_doc.pdf",
        "http://www.dataprotection.ie/documents/guidance/GuidanceFinance.pdf",
        "http://www.fmbb2012.com/JumpingQualifica1.pdf",
        "http://www.consulatdumaroc.ca/coloniefh22012.pdf",
        "http://www.rgrdlaw.com/media/cases/140_Complaint.pdf" };
String name[] = { "bases.pdf", "campusmap0607.pdf", "web_page_doc.pdf",
        "GuidanceFinance.pdf", "JumpingQualifica1.pdf",
        "coloniefh22012.pdf", "140_Complaint.pdf", };

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    mProgressDialog = new ProgressDialog(SpinnerActivity.this);
    mProgressDialog.setMessage("Please be patient, file downloading...");
    mProgressDialog.setIndeterminate(false);
    mProgressDialog.setMax(100);
    mProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);

    spDownloadFrom = (Spinner) findViewById(R.id.Spinner01);

    spinnerArrayAdapter = new ArrayAdapter<CharSequence>(this,
            android.R.layout.simple_spinner_item, name);
    spinnerArrayAdapter
            .setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    spDownloadFrom.setAdapter(spinnerArrayAdapter);

    spDownloadFrom.setOnItemSelectedListener(new SpinnerListener(
            spDownloadFrom));
}

public class SpinnerListener implements OnItemSelectedListener {
    Spinner sp;

    public SpinnerListener(View v) {
        sp = (Spinner) findViewById(v.getId());
    }

    @Override
    public void onItemSelected(AdapterView<?> parent, View v, int arg2,
            long arg3) {
        // Call to download class
        startDownload(arg2);

    }

    @Override
    public void onNothingSelected(AdapterView<?> arg0) {
        // TODO Auto-generated method stub

    }
}

private void startDownload(int position) {
    DownloadFile downloadFile = new DownloadFile(position);
    downloadFile.execute(url[position]);
}

class DownloadFile extends AsyncTask<String, Integer, String> { // put your
                                                                // download
                                                                // code
    private int position;

    public DownloadFile(int position) {
        this.position = position;
    }

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        mProgressDialog.show();
    }

    @Override
    protected void onProgressUpdate(Integer... progress) {
        super.onProgressUpdate(progress);
        mProgressDialog.setProgress(progress[0]);
    }

    @Override
    protected String doInBackground(String... aurl) {
        try {

            URL url = new URL(aurl[0]);
            URLConnection connection = url.openConnection();

            connection.connect();
            int fileLength = connection.getContentLength();
            int tickSize = 2 * fileLength / 100;
            int nextProgress = tickSize;

            Log.d(

            "ANDRO_ASYNC", "Lenght of file: " + fileLength);

            InputStream input = new BufferedInputStream(url.openStream());

            String path = Environment.getExternalStorageDirectory()
                    + "/Android/Data/"
                    + getApplicationContext().getPackageName() + "/files/";
            File file = new File(path);
            file.mkdirs();
            File outputFile = new File(file, name[position]);

            OutputStream output = new FileOutputStream(outputFile);

            byte data[] = new byte[1024 * 1024];
            long total = 0;
            int count;
            while ((count = input.read(data)) != -1) {
                total += count;
                if (total >= nextProgress) {
                    nextProgress = (int) ((total / tickSize + 1) * tickSize);
                    this.publishProgress((int) (total * 100 / fileLength));
                }
                output.write(data, 0, count);
            }

            output.flush();
            output.close();
            input.close();
            mProgressDialog.dismiss();

        } catch (Exception e) {
            Log.e("Spinner", "exception", e);
        }
        return null;
    }

    protected void onProgressUpdate(String... progress) {
        Log.d("Downloading", progress[0]);

    }

    @Override
    protected void onPostExecute(String unused) {

        mProgressDialog.dismiss();

        File file = new File(Environment.getExternalStorageDirectory()
                + "/Android/Data/"
                + getApplicationContext().getPackageName() + "/files/"
                + name[position]);
        Intent testIntent = new Intent(Intent.ACTION_VIEW);
        testIntent.setType("application/pdf");
        Intent intent = new Intent();
        intent.setAction(Intent.ACTION_VIEW);
        Uri uri = Uri.fromFile(file);
        intent.setDataAndType(uri, "application/pdf");
        try {
            startActivity(intent);
        } catch (ActivityNotFoundException e) {
            Toast.makeText(SpinnerActivity.this,
                    "No Application Available to View PDF",
                    Toast.LENGTH_LONG).show();
        }
    }
}
}
4

1 回答 1

2

问题来自这一行：

String path = Environment.getExternalStorageDirectory()
                + "/Android/Data/"
                + getApplicationContext().getPackageName() + "/files/" + name;
//                                                                         ^

name是一个文件名数组，你想要的是单个文件名。您需要的是传递positionviaDownloadFile构造函数。像这样的东西：

private void startDownload(int position) {
    DownloadFile downloadFile = new DownloadFile(position);
    downloadFile.execute(url[position]);
}

class DownloadFile extends AsyncTask<String, Integer, String>
{
    private int position:

    public DownloadFile(int position){this.position = position;}

    // ...

    String path = Environment.getExternalStorageDirectory()
                + "/Android/Data/"
                + getApplicationContext().getPackageName() + "/files/" + name[position];
    // ...
}
于 2012-05-06T00:42:56.477 回答