55package io .flutter .plugins .share ;
66
77import android .app .Activity ;
8+ import android .content .Context ;
89import android .content .Intent ;
10+ import android .content .pm .PackageManager ;
11+ import android .content .pm .ResolveInfo ;
12+ import android .net .Uri ;
13+ import android .os .Environment ;
14+ import androidx .annotation .NonNull ;
15+ import androidx .core .content .FileProvider ;
16+ import java .io .File ;
17+ import java .io .FileInputStream ;
18+ import java .io .FileOutputStream ;
19+ import java .io .IOException ;
20+ import java .io .InputStream ;
21+ import java .io .OutputStream ;
22+ import java .util .ArrayList ;
23+ import java .util .List ;
924
1025/** Handles share intent. */
1126class Share {
1227
28+ private Context context ;
1329 private Activity activity ;
1430
1531 /**
16- * Constructs a Share object. The {@code activity} is used to start the share intent. It might be
17- * null when constructing the {@link Share} object and set to non-null when an activity is
18- * available using {@link #setActivity(Activity)}.
32+ * Constructs a Share object. The {@code context} and {@code activity} are used to start the share
33+ * intent. The {@code activity} might be null when constructing the {@link Share} object and set
34+ * to non-null when an activity is available using {@link #setActivity(Activity)}.
1935 */
20- Share (Activity activity ) {
36+ Share (Context context , Activity activity ) {
37+ this .context = context ;
2138 this .activity = activity ;
2239 }
2340
@@ -40,11 +57,177 @@ void share(String text, String subject) {
4057 shareIntent .putExtra (Intent .EXTRA_SUBJECT , subject );
4158 shareIntent .setType ("text/plain" );
4259 Intent chooserIntent = Intent .createChooser (shareIntent , null /* dialog title optional */ );
60+ startActivity (chooserIntent );
61+ }
62+
63+ void shareFiles (List <String > paths , List <String > mimeTypes , String text , String subject )
64+ throws IOException {
65+ if (paths == null || paths .isEmpty ()) {
66+ throw new IllegalArgumentException ("Non-empty path expected" );
67+ }
68+
69+ clearExternalShareFolder ();
70+ ArrayList <Uri > fileUris = getUrisForPaths (paths );
71+
72+ Intent shareIntent = new Intent ();
73+ if (fileUris .isEmpty ()) {
74+ share (text , subject );
75+ return ;
76+ } else if (fileUris .size () == 1 ) {
77+ shareIntent .setAction (Intent .ACTION_SEND );
78+ shareIntent .putExtra (Intent .EXTRA_STREAM , fileUris .get (0 ));
79+ shareIntent .setType (
80+ !mimeTypes .isEmpty () && mimeTypes .get (0 ) != null ? mimeTypes .get (0 ) : "*/*" );
81+ } else {
82+ shareIntent .setAction (Intent .ACTION_SEND_MULTIPLE );
83+ shareIntent .putParcelableArrayListExtra (Intent .EXTRA_STREAM , fileUris );
84+ shareIntent .setType (reduceMimeTypes (mimeTypes ));
85+ }
86+ if (text != null ) shareIntent .putExtra (Intent .EXTRA_TEXT , text );
87+ if (subject != null ) shareIntent .putExtra (Intent .EXTRA_SUBJECT , subject );
88+ shareIntent .addFlags (Intent .FLAG_GRANT_READ_URI_PERMISSION );
89+ Intent chooserIntent = Intent .createChooser (shareIntent , null /* dialog title optional */ );
90+
91+ List <ResolveInfo > resInfoList =
92+ getContext ()
93+ .getPackageManager ()
94+ .queryIntentActivities (chooserIntent , PackageManager .MATCH_DEFAULT_ONLY );
95+ for (ResolveInfo resolveInfo : resInfoList ) {
96+ String packageName = resolveInfo .activityInfo .packageName ;
97+ for (Uri fileUri : fileUris ) {
98+ getContext ()
99+ .grantUriPermission (
100+ packageName ,
101+ fileUri ,
102+ Intent .FLAG_GRANT_WRITE_URI_PERMISSION | Intent .FLAG_GRANT_READ_URI_PERMISSION );
103+ }
104+ }
105+
106+ startActivity (chooserIntent );
107+ }
108+
109+ private void startActivity (Intent intent ) {
43110 if (activity != null ) {
44- activity .startActivity (chooserIntent );
111+ activity .startActivity (intent );
112+ } else if (context != null ) {
113+ intent .addFlags (Intent .FLAG_ACTIVITY_NEW_TASK );
114+ context .startActivity (intent );
115+ } else {
116+ throw new IllegalStateException ("Both context and activity are null" );
117+ }
118+ }
119+
120+ private ArrayList <Uri > getUrisForPaths (List <String > paths ) throws IOException {
121+ ArrayList <Uri > uris = new ArrayList <>(paths .size ());
122+ for (String path : paths ) {
123+ File file = new File (path );
124+ if (!fileIsOnExternal (file )) {
125+ file = copyToExternalShareFolder (file );
126+ }
127+
128+ uris .add (
129+ FileProvider .getUriForFile (
130+ getContext (), getContext ().getPackageName () + ".flutter.share_provider" , file ));
131+ }
132+ return uris ;
133+ }
134+
135+ private String reduceMimeTypes (List <String > mimeTypes ) {
136+ if (mimeTypes .size () > 1 ) {
137+ String reducedMimeType = mimeTypes .get (0 );
138+ for (int i = 1 ; i < mimeTypes .size (); i ++) {
139+ String mimeType = mimeTypes .get (i );
140+ if (!reducedMimeType .equals (mimeType )) {
141+ if (getMimeTypeBase (mimeType ).equals (getMimeTypeBase (reducedMimeType ))) {
142+ reducedMimeType = getMimeTypeBase (mimeType ) + "/*" ;
143+ } else {
144+ reducedMimeType = "*/*" ;
145+ break ;
146+ }
147+ }
148+ }
149+ return reducedMimeType ;
150+ } else if (mimeTypes .size () == 1 ) {
151+ return mimeTypes .get (0 );
45152 } else {
46- chooserIntent .addFlags (Intent .FLAG_ACTIVITY_NEW_TASK );
47- activity .startActivity (chooserIntent );
153+ return "*/*" ;
154+ }
155+ }
156+
157+ @ NonNull
158+ private String getMimeTypeBase (String mimeType ) {
159+ if (mimeType == null || !mimeType .contains ("/" )) {
160+ return "*" ;
161+ }
162+
163+ return mimeType .substring (0 , mimeType .indexOf ("/" ));
164+ }
165+
166+ private boolean fileIsOnExternal (File file ) {
167+ try {
168+ String filePath = file .getCanonicalPath ();
169+ File externalDir = Environment .getExternalStorageDirectory ();
170+ return externalDir != null && filePath .startsWith (externalDir .getCanonicalPath ());
171+ } catch (IOException e ) {
172+ return false ;
173+ }
174+ }
175+
176+ @ SuppressWarnings ("ResultOfMethodCallIgnored" )
177+ private void clearExternalShareFolder () {
178+ File folder = getExternalShareFolder ();
179+ if (folder .exists ()) {
180+ for (File file : folder .listFiles ()) {
181+ file .delete ();
182+ }
183+ folder .delete ();
184+ }
185+ }
186+
187+ @ SuppressWarnings ("ResultOfMethodCallIgnored" )
188+ private File copyToExternalShareFolder (File file ) throws IOException {
189+ File folder = getExternalShareFolder ();
190+ if (!folder .exists ()) {
191+ folder .mkdirs ();
192+ }
193+
194+ File newFile = new File (folder , file .getName ());
195+ copy (file , newFile );
196+ return newFile ;
197+ }
198+
199+ @ NonNull
200+ private File getExternalShareFolder () {
201+ return new File (getContext ().getExternalCacheDir (), "share" );
202+ }
203+
204+ private Context getContext () {
205+ if (activity != null ) {
206+ return activity ;
207+ }
208+ if (context != null ) {
209+ return context ;
210+ }
211+
212+ throw new IllegalStateException ("Both context and activity are null" );
213+ }
214+
215+ private static void copy (File src , File dst ) throws IOException {
216+ InputStream in = new FileInputStream (src );
217+ try {
218+ OutputStream out = new FileOutputStream (dst );
219+ try {
220+ // Transfer bytes from in to out
221+ byte [] buf = new byte [1024 ];
222+ int len ;
223+ while ((len = in .read (buf )) > 0 ) {
224+ out .write (buf , 0 , len );
225+ }
226+ } finally {
227+ out .close ();
228+ }
229+ } finally {
230+ in .close ();
48231 }
49232 }
50233}
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