Ne peut pas ouvrir le fichier PDF dans app externe

Je voudrais ouvrir un fichier PDF lorsque l'utilisateur clique sur un bouton.
Actuellement, je suis en utilisant ce code pour obtenir ceci:

Uri path = Uri.fromFile(new File("file:///android_asset/regola11_1.pdf"));
            Intent pdfIntent = new Intent(Intent.ACTION_VIEW);
            pdfIntent.setDataAndType(path, "application/pdf");
            pdfIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
            startActivity(pdfIntent);

mais ça ne fonctionne pas.

Lorsque je sélectionne à l'aide d'Adobe Acrobat, je reçois un message, affiché comme un Toast, qui dit

"This file could not be accessed Check the location or the network and try again."

Quand j'ai essayer avec le Lecteur PDF Viewer, je reçois

"Cannot display PDF ( regola11_1.pdf cannot be opened)"

Le fichier PDF est stocké dans

app > build > intermediates > assets

Où est le problème?

MODIFIER

Maintenant, je suis en utilisant le code suivant:

File file = new File("\"file:///android_asset/regola11_1.pdf");
            Uri path = Uri.fromFile(file);
            Intent intent = new Intent(Intent.ACTION_VIEW);
            intent.setDataAndType(path, "application/pdf");
            intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);

            try {
                context.startActivity(intent);
            }
            catch (ActivityNotFoundException e) {
                Toast.makeText(context, "No application available to view PDF", Toast.LENGTH_LONG).show();
            }

Mais lorsque j'essaie d'ouvrir le fichier PDF en cliquant sur le bouton, l'application se bloque.

C'est le journal que je reçois:

05-31 10:05:25.132  24474-24474/? E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.andrey.andreyvedis.iamaref, PID: 24474
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.content.Context.startActivity(android.content.Intent)' on a null object reference
        at com.andrey.andreyvedis.iamaref.FragmentR11.onClick(FragmentR11.java:147)
        at android.view.View.performClick(View.java:4781)
        at android.view.View$PerformClick.run(View.java:19873)
        at android.os.Handler.handleCallback(Handler.java:739)
        at android.os.Handler.dispatchMessage(Handler.java:95)
        at android.os.Looper.loop(Looper.java:135)
        at android.app.ActivityThread.main(ActivityThread.java:5293)
        at java.lang.reflect.Method.invoke(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:372)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:904)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:699)

C'est ma classe:

public class FragmentR11 extends Fragment implements  View.OnClickListener{
//TODO: Rename parameter arguments, choose names that match
//the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
Context context;
//TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* @param param1 Parameter 1.
* @param param2 Parameter 2.
* @return A new instance of fragment FragmentR11.
*/
//TODO: Rename and change types and number of parameters
public static FragmentR11 newInstance(String param1, String param2) {
FragmentR11 fragment = new FragmentR11();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
public FragmentR11() {
//Required empty public constructor
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
//Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_r11, container, false);
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
getActivity().findViewById(R.id.bD1).setOnClickListener(this);
getActivity().findViewById(R.id.bD2).setOnClickListener(this);
getActivity().findViewById(R.id.bD3).setOnClickListener(this);
getActivity().findViewById(R.id.bD4).setOnClickListener(this);
getActivity().findViewById(R.id.bD5).setOnClickListener(this);
getActivity().findViewById(R.id.bD6).setOnClickListener(this);
getActivity().findViewById(R.id.bD7).setOnClickListener(this);
getActivity().findViewById(R.id.bD8).setOnClickListener(this);
getActivity().findViewById(R.id.bD9).setOnClickListener(this);
getActivity().findViewById(R.id.bD10).setOnClickListener(this);
getActivity().findViewById(R.id.bD11).setOnClickListener(this);
getActivity().findViewById(R.id.bD12).setOnClickListener(this);
getActivity().findViewById(R.id.bD13).setOnClickListener(this);
getActivity().findViewById(R.id.bD14).setOnClickListener(this);
getActivity().findViewById(R.id.bD15).setOnClickListener(this);
getActivity().findViewById(R.id.bD16).setOnClickListener(this);
getActivity().findViewById(R.id.bD17).setOnClickListener(this);
}
/**private void openPDF(final String pathToPDF) {
File file = new File(pathToPDF);
Uri path = Uri.fromFile(file);
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
intent.setDataAndType(path, "application/pdf");
try {
startActivity(intent);
} catch (ActivityNotFoundException e) {
Toast.makeText(getActivity(), "Devi installare un'app per aprire PDF, come Adobe Acrobat Reader ", Toast.LENGTH_SHORT).show();
}
}*/
@Override
public void onClick(View v) {
switch(v.getId()){
case R.id.bD1: {
/**Uri path = Uri.fromFile(new File("regola11_1.pdf"));
Intent pdfIntent = new Intent(Intent.ACTION_VIEW);
pdfIntent.setDataAndType(path, "application/pdf");
pdfIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(pdfIntent);
Toast.makeText(getActivity(), "Hai cliccato Regola 1 in Reg11 ", Toast.LENGTH_SHORT).show();*/
File file = new File("\"file:///android_asset/regola11_1.pdf");
Uri path = Uri.fromFile(file);
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(path, "application/pdf");
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
try {
context.startActivity(intent);
}
catch (ActivityNotFoundException e) {
Toast.makeText(context, "No application available to view PDF", Toast.LENGTH_LONG).show();
}
break;
}
case R.id.bD2:
{
Toast.makeText(getActivity(), "Hai cliccato Regola 2 in Reg11 ", Toast.LENGTH_SHORT).show();
break;
}
case R.id.bD3:
{
Toast.makeText(getActivity(), "Hai cliccato Regola 3 in Reg11 ", Toast.LENGTH_SHORT).show();
break;
}
case R.id.bD4:
{
Toast.makeText(getActivity(), "Hai cliccato Regola 4 in Reg11 ", Toast.LENGTH_SHORT).show();
break;
}
case R.id.bD5:
{
Toast.makeText(getActivity(), "Hai cliccato Regola 5 in Reg11 ", Toast.LENGTH_SHORT).show();
break;
}
case R.id.bD6:
{
Toast.makeText(getActivity(), "Hai cliccato Regola 6 in Reg11 ", Toast.LENGTH_SHORT).show();
break;
}
case R.id.bD7:
{
Toast.makeText(getActivity(), "Hai cliccato Regola 7 in Reg11 ", Toast.LENGTH_SHORT).show();
break;
}
case R.id.bD8:
{
Toast.makeText(getActivity(), "Hai cliccato Regola 8 in Reg11 ", Toast.LENGTH_SHORT).show();
break;
}
case R.id.bD9:
{
Toast.makeText(getActivity(), "Hai cliccato Regola 9 in Reg11 ", Toast.LENGTH_SHORT).show();
break;
}
case R.id.bD10:
{
Toast.makeText(getActivity(), "Hai cliccato Regola 10 in Reg11 ", Toast.LENGTH_SHORT).show();
break;
}
case R.id.bD11:
{
Toast.makeText(getActivity(), "Hai cliccato Regola 11 in Reg11 ", Toast.LENGTH_SHORT).show();
break;
}
case R.id.bD12:
{
Toast.makeText(getActivity(), "Hai cliccato Regola 12 in Reg11 ", Toast.LENGTH_SHORT).show();
break;
}
case R.id.bD13:
{
Toast.makeText(getActivity(), "Hai cliccato Regola 13 in Reg11 ", Toast.LENGTH_SHORT).show();
break;
}
case R.id.bD14:
{
Toast.makeText(getActivity(), "Hai cliccato Regola 14 in Reg11 ", Toast.LENGTH_SHORT).show();
break;
}
case R.id.bD15:
{
Toast.makeText(getActivity(), "Hai cliccato Regola 15 in Reg11 ", Toast.LENGTH_SHORT).show();
break;
}
case R.id.bD16:
{
Toast.makeText(getActivity(), "Hai cliccato Regola 16 in Reg11 ", Toast.LENGTH_SHORT).show();
break;
}
case R.id.bD17:
{
Toast.makeText(getActivity(), "Hai cliccato Regola 17 in Reg11 ", Toast.LENGTH_SHORT).show();
break;
}
}
}

}

Quelqu'un peut m'aider?

EDIT 2

J'ai trouvé la solution, consultez ma réponse ci-dessous pour le code.

Merci à vous tous pour vos réponses.

OriginalL'auteur Andrey E. Vedishchev | 2015-05-30