激活微调器中的任何按钮后,进度对话框出现但没有任何反应。我有这个与按钮完美配合,但在转换到微调器时不明白这里有什么问题。有人发现下载无法正常启动的原因吗?
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(Integer... url) {
DownloadFile downloadFile = new DownloadFile();
downloadFile.execute();
}
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) {
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();
}
}
}
}
答案 0 :(得分:1)
在startDownload
方法中,您传入url
,这是一个String
类型的数组。在doInBackground
的{{1}}中,您只使用了AsyncTask
的第一个索引,并将其设置为url
,因此您传递的是""
String
}}
要传入您期望的网址,请更改startDownload
方法以接受int
值。然后在onItemSelected
方法中,传入您命名为arg2
的位置(参数名称应该是父级,视图,位置和ID,按顺序排列。更容易理解它们的含义)。然后,当您致电downloadFile.execute
时,请传入url[position]
。
修改强>
将下载方法更改为:
private void startDownload(int position) {
DownloadFile downloadFile = new DownloadFile();
downloadFile.execute(url[position]);
}
假设您使用的URL有效,那么应该会给您预期的结果。此外,您的对话框不会消失,因为您忘记在mProgressDialog.dismiss()
中致电onPostExecute
。