Add debugging feature to clear database

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

vlc-android/res/values/strings.xml

@@ -66,6 +66,7 @@
     <string name="enable_iomx">Enable hardware accelerated decoding</string>
     <string name="advanced_debugging">Advanced Debugging</string>
     <string name="quit">Quit Application</string>
+    <string name="clear_media_db">Clear media database</string>
     <string name="detect_headset">Detect headset</string>
     <string name="detect_headset_detail">Pause on headset removed, Resume on headset inserted</string>
     <string name="refresh">Refresh</string>

vlc-android/res/xml/preferences.xml

@@ -34,6 +34,7 @@
     <PreferenceCategory android:title="@string/advanced_prefs_category">
         <PreferenceScreen android:title="@string/advanced_debugging">
             <Preference android:title="@string/quit" android:key="quit_app" android:enabled="true"/>
+            <Preference android:title="@string/clear_media_db" android:key="clear_media_db" android:enabled="true" />
         </PreferenceScreen>
     </PreferenceCategory>
 </PreferenceScreen>

vlc-android/src/org/videolan/vlc/DatabaseManager.java

@@ -475,5 +475,11 @@ public class DatabaseManager {
     public synchronized void clearSearchhistory() {
         mDb.delete(SEARCHHISTORY_TABLE_NAME, null, null);
     }
-
+    
+    /**
+     * Empty the database for debugging purposes
+     */
+    public synchronized void emptyDatabase() {
+        mDb.delete(MEDIA_TABLE_NAME, null, null);
+    }
 }

vlc-android/src/org/videolan/vlc/gui/PreferencesActivity.java

@@ -33,6 +33,7 @@ import android.preference.CheckBoxPreference;
 import android.preference.Preference;
 import android.preference.Preference.OnPreferenceClickListener;
 import android.preference.PreferenceActivity;
+import android.widget.Toast;
 
 public class PreferencesActivity extends PreferenceActivity {
 
@@ -114,6 +115,16 @@ public class PreferencesActivity extends PreferenceActivity {
                         return true;
                     }
                 });
+        Preference clearMediaPref = (Preference)findPreference("clear_media_db");
+        clearMediaPref.setOnPreferenceClickListener(
+                new OnPreferenceClickListener() {
+
+                    public boolean onPreferenceClick(Preference preference) {
+                        DatabaseManager.getInstance(getBaseContext()).emptyDatabase();
+                        Toast.makeText(getBaseContext(), "Media database cleared!", Toast.LENGTH_SHORT);
+                        return true;
+                    }
+                });
     }
 
     @Override