[英]Open File PDF automatically After Download Completed
我有个问题。 我有下载和打开PDF文件的代码。 我希望下载完成后,PDF将自动打开。
这是我下载pdf文件的代码:
private EditText ids;
private TextView no;
private TextView per;
private EditText surat_fi;
private EditText disp;
private Button kepada, baca;
Context context=this;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.suratmasuk);
ids = (EditText) findViewById(R.id.edid);
no = (TextView) findViewById(R.id.ednomor);
per = (TextView) findViewById(R.id.edperihal);
surat_fi = (EditText) findViewById(R.id.surat);
disp = (EditText) findViewById(R.id.eddisposisi);
ArrayList<HashMap<String, String>> mylist = new ArrayList<HashMap<String, String>>();
JSONObject json = JSONSuratMasuk.getJSONfromURL("http://link...");
try{
JSONArray data = json.getJSONArray("data");
for(int i=0;i<data.length();i++){
HashMap<String, String> map = new HashMap<String, String>();
JSONObject jsonobj = data.getJSONObject(i);
map.put("id1", jsonobj.getString("id"));
map.put("nomor", jsonobj.getString("nosurat"));
map.put("perihal", jsonobj.getString("perihal"));
map.put("surat", jsonobj.getString("surat"));
mylist.add(map);
}
}catch(JSONException e) {
Log.e("log_tag", "Error parsing data "+e.toString());
}
ListAdapter adapter = new SimpleAdapter(this, mylist , R.layout.row,
new String[] { "nomor", "perihal" },
new int[] { R.id.lvnomor, R.id.lvperihal });
setListAdapter(adapter);
final ListView lv = getListView();
lv.setTextFilterEnabled(true);
lv.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
@SuppressWarnings("unchecked")
HashMap<String, String> o = (HashMap<String, String>) lv.getItemAtPosition(position);
no.setText(String.valueOf(o.get("nomor")));
per.setText(String.valueOf(o.get("perihal")));
surat_fi.setText(String.valueOf(o.get("surat")));
Boolean result=isDownloadManagerAvailable(getApplicationContext());
if (result)
downloadFile();
}
});
}
});
@SuppressLint("NewApi")
public void downloadFile() {
String surfil = surat_fi.getText().toString();
String DownloadUrl = "http://link...";
String fs = DownloadUrl+surfil;
DownloadManager.Request request = new DownloadManager.Request(Uri.parse(fs));
request.setDescription("Sedang download");
request.setTitle(surfil);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
request.allowScanningByMediaScanner();
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
}
request.setDestinationInExternalFilesDir(getApplicationContext(),null, surfil);
DownloadManager manager = (DownloadManager)getSystemService(Context.DOWNLOAD_SERVICE);
manager.enqueue(request);
}
}
@SuppressLint("NewApi")
public static boolean isDownloadManagerAvailable(Context context) {
try {
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.GINGERBREAD) {
return false;
}
Intent intent = new Intent(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_LAUNCHER);
intent.setClassName("com.android.providers.downloads.ui","com.android.providers.downloads.ui.DownloadList");
List <ResolveInfo> list = context.getPackageManager().queryIntentActivities(intent,
PackageManager.MATCH_DEFAULT_ONLY);
return list.size() > 0;
} catch (Exception e) {
return false;
}
}
这是打开PDF File的代码:
String sur_fil = surat_fi.getText().toString();
String baca_file = "/sdcard/Android/data/com.e_office/files/";
String fs_baca = baca_file+sur_fil;
File pdfFile = new File(fs_baca);
if(pdfFile.exists()) {
Uri path = Uri.fromFile(pdfFile);
Intent pdfIntent = new Intent(Intent.ACTION_VIEW);
pdfIntent.setDataAndType(path, "application/pdf");
pdfIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
try {
startActivity(pdfIntent);
} catch(ActivityNotFoundException e) {
Toast.makeText(SuratMasuk.this, "No Application available to view pdf", Toast.LENGTH_LONG).show();
}
}
我应该放在哪里?
好吧! 无论何时执行下载任务,最好通过进度对话框将代码放在异步任务中。这需要一些时间。因此,您可以执行以下操作。
==>在Async()
任务的doinBackground()
部分中放置/调用您的下载代码。
==>如下在preexecute()
和postexecute()
调用progressdialog()
。
==>在mProgressDialog.dismiss();
之后的mProgressDialog.dismiss();
调用openfile()
函数,并在fileopen()
函数中编写文件打开器代码。
class MyAsyncTask extends AsyncTask<String, String, Void> {
boolean running;
@Override
protected Void doInBackground(String...fUrl) {
int count;
InputStream input = null;
OutputStream output = null;
HttpURLConnection connection = null;
try {
URL url = new URL(fUrl[0]);
connection = (HttpURLConnection) url.openConnection();
connection.connect();
int lenghtOfFile = connection.getContentLength();
// download the file
input = connection.getInputStream();
output = new FileOutputStream(
Environment.getExternalStorageDirectory() + "/MDroid/"
+ fileName);
//#################################
mydownload(fileUrl, filepath, fileName,
visibility); //i am calling download function() here
//##########################################
byte data[] = new byte[4096];
long total = 0;
while ((count = input.read(data)) != -1) {
total += count;
publishProgress(""+(int)((total*100)/lenghtOfFile));
output.write(data, 0, count);
}
output.close();
input.close();
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPreExecute() {
super.onPreExecute();
running = true;
mProgressDialog.show();
}
@Override
protected void onPostExecute(Void aVoid) {
super.onPostExecute(aVoid);
mProgressDialog.dismiss();
openfile();
}
@Override
protected void onProgressUpdate(String... progress) {
// Update the progress dialog
mProgressDialog.setProgress(Integer.parseInt(progress[0]));
}
}
==> openfile()
函数代码是这样的。
public void openfile()
{
try {
File file = new File(Environment
.getExternalStoragePublicDirectory("/MDroid")
+ filepath + fileName);
Intent testIntent = new Intent("com.adobe.reader");
testIntent.setType("application/pdf");
testIntent.setAction(Intent.ACTION_VIEW);
Uri uri = Uri.fromFile(file);
testIntent.setDataAndType(uri, "application/pdf");
context.startActivity(testIntent);
} catch (Exception e) {
e.printStackTrace();
}
}
使用以下操作编写广播接收器 : DownloadManager.ACTION_DOWNLOAD_COMPLETE
。 下载文件后,它将进入接收器中的onReceive()
。
将您的下载调用放在try catch块中,一旦调用成功,就在结尾之前,调用一个名为openpdf()的新方法,您可以在其中放置此代码。
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