Reputation: 607
i've a pdf file in my app assets directory that i want open using an external app, so wrote my content provider and i'm tryng to make it work but nothing...
here is the code:
Content Provider:
package package.name;
import java.io.File;
import java.io.FileNotFoundException;
import java.net.URI;
import android.content.ContentProvider;
import android.content.ContentValues;
import android.database.Cursor;
import android.net.Uri;
import android.os.ParcelFileDescriptor;
public class FileContentProvider extends ContentProvider {
private static final String URI_PREFIX = "content://package.name.filecontentprovider";
public static String constructUri(String url) {
Uri uri = Uri.parse(url);
return uri.isAbsolute() ? url : URI_PREFIX + url;
}
@Override
public ParcelFileDescriptor openFile(Uri uri, String mode) throws FileNotFoundException {
URI uri1 = URI.create("file:///data/data/package.name/"+uri.getPath());
File file = new File(uri1.getPath());
ParcelFileDescriptor parcel = ParcelFileDescriptor.open(file, ParcelFileDescriptor.MODE_READ_ONLY);
return parcel;
}
@Override
public boolean onCreate() {
return true;
}
@Override
public int delete(Uri uri, String s, String[] as) {
throw new UnsupportedOperationException("Not supported by this provider");
}
@Override
public String getType(Uri uri) {
throw new UnsupportedOperationException("Not supported by this provider");
}
@Override
public Uri insert(Uri uri, ContentValues contentvalues) {
throw new UnsupportedOperationException("Not supported by this provider");
}
@Override
public Cursor query(Uri uri, String[] as, String s, String[] as1, String s1) {
throw new UnsupportedOperationException("Not supported by this provider");
}
@Override
public int update(Uri uri, ContentValues contentvalues, String s, String[] as) {
throw new UnsupportedOperationException("Not supported by this provider");
}
}
and here how i call the opening of the file:
File pdf = new File("assets/prova.pdf");
Intent i = new Intent(Intent.ACTION_VIEW, Uri.parse("content://package.name/" + pdf));
i.setType("application/pdf");
startActivity(i);
i've added the following line in the android manifest, inside the tag:
<provider android:name=".FileContentProvider" android:authorities="package.name" />
this is the logcat output:
02-26 19:47:44.938: ERROR/AndroidRuntime(6494): Uncaught handler: thread main exiting due to uncaught exception
02-26 19:47:44.953: ERROR/AndroidRuntime(6494): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.tf.thinkdroid.samsung/com.tf.thinkdroid.pdf.app.PdfRenderScreen}: java.lang.NullPointerException
02-26 19:47:44.953: ERROR/AndroidRuntime(6494): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2496)
02-26 19:47:44.953: ERROR/AndroidRuntime(6494): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2512)
02-26 19:47:44.953: ERROR/AndroidRuntime(6494): at android.app.ActivityThread.access$2200(ActivityThread.java:119)
02-26 19:47:44.953: ERROR/AndroidRuntime(6494): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1863)
02-26 19:47:44.953: ERROR/AndroidRuntime(6494): at android.os.Handler.dispatchMessage(Handler.java:99)
02-26 19:47:44.953: ERROR/AndroidRuntime(6494): at android.os.Looper.loop(Looper.java:123)
02-26 19:47:44.953: ERROR/AndroidRuntime(6494): at android.app.ActivityThread.main(ActivityThread.java:4363)
02-26 19:47:44.953: ERROR/AndroidRuntime(6494): at java.lang.reflect.Method.invokeNative(Native Method)
02-26 19:47:44.953: ERROR/AndroidRuntime(6494): at java.lang.reflect.Method.invoke(Method.java:521)
02-26 19:47:44.953: ERROR/AndroidRuntime(6494): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:862)
02-26 19:47:44.953: ERROR/AndroidRuntime(6494): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:620)
02-26 19:47:44.953: ERROR/AndroidRuntime(6494): at dalvik.system.NativeStart.main(Native Method)
02-26 19:47:44.953: ERROR/AndroidRuntime(6494): Caused by: java.lang.NullPointerException
02-26 19:47:44.953: ERROR/AndroidRuntime(6494): at com.tf.thinkdroid.pdf.app.RenderScreen.onNewIntent(Unknown Source)
02-26 19:47:44.953: ERROR/AndroidRuntime(6494): at com.tf.thinkdroid.pdf.app.RenderScreen.onCreate(Unknown Source)
02-26 19:47:44.953: ERROR/AndroidRuntime(6494): at com.tf.thinkdroid.pdf.app.PdfRenderScreen.onCreate(Unknown Source)
02-26 19:47:44.953: ERROR/AndroidRuntime(6494): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
02-26 19:47:44.953: ERROR/AndroidRuntime(6494): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2459)
02-26 19:47:44.953: ERROR/AndroidRuntime(6494): ... 11 more
don't understand where the problem is, seem that the external application can't get the file.
thanks for any help!
Upvotes: 2
Views: 12357
Reputation: 14145
My implementation is below. Note that if your filename is MyPdf.pdf, the file should be assets/public_pdfs/MyPdf.pdf.mp3. The path public_pdfs is to only export the pdfs you really want to export, and the .mp3 extension is to prevent compression.
AndroidManifest.xml
<provider android:authorities="my.app.PdfContentProvider" android:enabled="true" android:exported="true" android:name="my.app.PdfContentProvider">
</provider>
Opening a PDF
Intent intent = new Intent();
intent.setAction(Intent.ACTION_VIEW);
Uri uri = Uri.parse("content://my.app.PdfContentProvider/" + filename);
intent.setDataAndType(uri, "application/pdf");
startActivity(intent);
PdfContentProvider.java
public class PdfContentProvider extends ContentProvider
{
private static final String PDFPATH = "public_pdfs/";
@Override
public String getType(Uri uri)
{
return "application/pdf";
}
@Override
public AssetFileDescriptor openAssetFile(Uri uri, String mode) throws FileNotFoundException
{
AssetManager am = getContext().getAssets();
String file_name = uri.getLastPathSegment();
if (file_name == null) throw new FileNotFoundException();
AssetFileDescriptor afd = null;
try
{
afd = am.openFd(PDFPATH + file_name + ".mp3");
}
catch (IOException e)
{
e.printStackTrace();
}
return afd;
}
private final static String[] COLUMNS = {OpenableColumns.DISPLAY_NAME, OpenableColumns.SIZE};
@Override
/**
* This function is required for it to work on the Quickoffice at Android 4.4 (KitKat)
*/
public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder)
{
if (projection == null)
{
projection = COLUMNS;
}
String[] cols = new String[projection.length];
Object[] values = new Object[projection.length];
int i = 0;
for (String col : projection)
{
if (OpenableColumns.DISPLAY_NAME.equals(col))
{
cols[i] = OpenableColumns.DISPLAY_NAME;
values[i++] = uri.getLastPathSegment();
}
else if (OpenableColumns.SIZE.equals(col))
{
cols[i] = OpenableColumns.SIZE;
values[i++] = AssetFileDescriptor.UNKNOWN_LENGTH;
}
}
cols = copyOf(cols, i);
values = copyOf(values, i);
final MatrixCursor cursor = new MatrixCursor(cols, 1);
cursor.addRow(values);
return cursor;
}
private static String[] copyOf(String[] original, int newLength)
{
final String[] result = new String[newLength];
System.arraycopy(original, 0, result, 0, newLength);
return result;
}
private static Object[] copyOf(Object[] original, int newLength)
{
final Object[] result = new Object[newLength];
System.arraycopy(original, 0, result, 0, newLength);
return result;
}
@Override
public boolean onCreate()
{
return true;
}
@Override
public Uri insert(Uri uri, ContentValues values)
{
return null;
}
@Override
public int delete(Uri uri, String selection, String[] selectionArgs)
{
return 0;
}
@Override
public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs)
{
return 0;
}
}
Upvotes: 5
Reputation: 61
I am new to android development and spent the whole day looking for the reason that my locally stored PDF could not be opened by external apps. I am glad having found this thread.
In the meantime Marco got it working and describes it here. Beware: Italian language- Google translation service might help ;-)
http://www.marcofaion.it/?p=7
http://web.archive.org/web/20111020204554/http://www.marcofaion.it/?p=7
Additional notes to his howto for beginners:
The line Marco mentions to be inserted in the Manifest.xml
<provider android:name=".FileContentProvider" android:authorities="package.name" />
should be inserted within the <application ...></application>
tag.
And if you plan to have custom filenames you should exchange
InputStream is = am.open("file.pdf");
with
InputStream is = am.open(uri.getLastPathSegment());
PDF files have to be put into already existing folder assets in your project (especially not in any newly added folder res/assets or sth.)! =)
Upvotes: 2
Reputation: 1007624
setType()
resets your Uri
to null
. Try skipping the Uri
in the constructor and using setDataAndType()
instead.
Upvotes: 2