From a5f792a718ccdf01d5702a38cc8a26d893d7fa94 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Dominik=20Sch=C3=BCrmann?= <dominik@dominikschuermann.de>
Date: Mon, 4 Jan 2016 10:28:51 +0100
Subject: Check for ACTION_OPEN_DOCUMENT before starting activity

---
 .../keychain/util/FileHelper.java                  | 38 ++++++++++++++++------
 1 file changed, 28 insertions(+), 10 deletions(-)

(limited to 'OpenKeychain/src/main/java/org/sufficientlysecure/keychain/util')

diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/util/FileHelper.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/util/FileHelper.java
index 67576f88e..106775201 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/util/FileHelper.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/util/FileHelper.java
@@ -29,12 +29,15 @@ import java.io.OutputStream;
 import java.io.UnsupportedEncodingException;
 import java.security.SecureRandom;
 import java.text.DecimalFormat;
+import java.util.List;
 
 import android.annotation.TargetApi;
 import android.content.ActivityNotFoundException;
 import android.content.ContentResolver;
 import android.content.Context;
 import android.content.Intent;
+import android.content.pm.PackageManager;
+import android.content.pm.ResolveInfo;
 import android.database.Cursor;
 import android.graphics.Bitmap;
 import android.graphics.Point;
@@ -76,6 +79,8 @@ import org.sufficientlysecure.keychain.R;
  */
 public class FileHelper {
 
+    private static Boolean hasOpenDocumentIntent;
+
     @TargetApi(VERSION_CODES.KITKAT)
     public static void saveDocument(Fragment fragment, String targetName, int requestCode) {
         saveDocument(fragment, targetName, "*/*", requestCode);
@@ -94,8 +99,9 @@ public class FileHelper {
     }
 
     public static void openDocument(Fragment fragment, Uri last, String mimeType, boolean multiple, int requestCode) {
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
-            openDocumentKitKat(fragment, last, mimeType, multiple, requestCode);
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT
+                && hasOpenDocumentIntent(fragment.getContext())) {
+            openDocumentKitKat(fragment, mimeType, multiple, requestCode);
         } else {
             openDocumentPreKitKat(fragment, last, mimeType, multiple, requestCode);
         }
@@ -126,7 +132,7 @@ public class FileHelper {
 
     /** Opens the storage browser on Android 4.4 or later for opening a file */
     @TargetApi(Build.VERSION_CODES.KITKAT)
-    private static void openDocumentKitKat(Fragment fragment, Uri last, String mimeType, boolean multiple, int requestCode) {
+    private static void openDocumentKitKat(Fragment fragment, String mimeType, boolean multiple, int requestCode) {
         Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
         intent.addCategory(Intent.CATEGORY_OPENABLE);
         intent.setType(mimeType);
@@ -134,14 +140,26 @@ public class FileHelper {
         intent.putExtra("android.content.extra.SHOW_ADVANCED", true);
         intent.putExtra(Intent.EXTRA_ALLOW_MULTIPLE, multiple);
 
-        try {
-            fragment.startActivityForResult(intent, requestCode);
-        } catch (ActivityNotFoundException e) {
-            // NOTE: Looks like some Android distributions are missing the ACTION_OPEN_DOCUMENT intent
-            // even on Android 4.4, see https://github.com/open-keychain/open-keychain/issues/1625
-            Log.w(Constants.TAG, "Couldn't start ACTION_OPEN_DOCUMENT intent, no activity found, falling back to ");
-            openDocumentPreKitKat(fragment, last, mimeType, multiple, requestCode);
+        fragment.startActivityForResult(intent, requestCode);
+    }
+
+    /**
+     * Does the device actually have a ACTION_OPEN_DOCUMENT Intent? Looks like some Android
+     * distributions are missing the ACTION_OPEN_DOCUMENT Intent even on Android 4.4,
+     * see https://github.com/open-keychain/open-keychain/issues/1625
+     *
+     * @return True, if the device supports ACTION_OPEN_DOCUMENT. False, otherwise.
+     */
+    @TargetApi(VERSION_CODES.KITKAT)
+    private static boolean hasOpenDocumentIntent(Context context) {
+        if (hasOpenDocumentIntent == null) {
+            PackageManager packageManager = context.getPackageManager();
+            List<ResolveInfo> resolveInfoList = packageManager.queryIntentActivities(
+                    new Intent(Intent.ACTION_OPEN_DOCUMENT), 0);
+            hasOpenDocumentIntent = !resolveInfoList.isEmpty();
         }
+
+        return hasOpenDocumentIntent;
     }
 
     public static String getFilename(Context context, Uri uri) {
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