custom list preference implementation for visual material consistency on pre-lollipop

res/xml/preferences.xml

@@ -26,7 +26,7 @@
 	</PreferenceCategory>
 
     <PreferenceCategory android:title="@string/prefs_category_instant_uploading" android:key="instant_uploading_category">
-         <ListPreference android:key="prefs_instant_behaviour"
+         <com.owncloud.android.ui.dialog.OwnCloudListPreference android:key="prefs_instant_behaviour"
 			 android:dialogTitle="@string/prefs_instant_behaviour_dialogTitle"
 			 android:title="@string/prefs_instant_behaviour_title"
 			 android:entries="@array/pref_behaviour_entries"

src/com/owncloud/android/ui/dialog/OwnCloudListPreference.java

@@ -0,0 +1,102 @@
+package com.owncloud.android.ui.dialog;
+
+import android.annotation.TargetApi;
+import android.content.Context;
+import android.content.DialogInterface;
+import android.os.Build;
+import android.os.Bundle;
+import android.preference.ListPreference;
+import android.preference.PreferenceManager;
+import android.support.v7.app.AppCompatDialog;
+import android.util.AttributeSet;
+
+import com.owncloud.android.R;
+import com.owncloud.android.lib.common.utils.Log_OC;
+
+import java.lang.reflect.Method;
+
+public class OwnCloudListPreference extends ListPreference {
+    private static final String TAG = OwnCloudListPreference.class.getSimpleName();
+
+    private Context mContext;
+    private AppCompatDialog mDialog;
+
+    public OwnCloudListPreference(Context context) {
+        super(context);
+        this.mContext = context;
+    }
+
+    public OwnCloudListPreference(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        this.mContext = context;
+    }
+
+    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
+    public OwnCloudListPreference(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
+        super(context, attrs, defStyleAttr, defStyleRes);
+    }
+
+    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
+    public OwnCloudListPreference(Context context, AttributeSet attrs, int defStyleAttr) {
+        super(context, attrs, defStyleAttr);
+    }
+
+    @Override
+    protected void showDialog(Bundle state) {
+        if (getEntries() == null || getEntryValues() == null) {
+            throw new IllegalStateException(
+                    "ListPreference requires an entries array and an entryValues array.");
+        }
+
+        int preselect = findIndexOfValue(getValue());
+        // TODO for some reason value change is persisted but not directly shown in Android-15 emulator
+        // same thing happens for the Standard ListPreference though
+        android.support.v7.app.AlertDialog.Builder builder =
+                new android.support.v7.app.AlertDialog.Builder(mContext, R.style.ownCloud_AlertDialog)
+                .setTitle(getDialogTitle())
+                .setIcon(getDialogIcon())
+                .setSingleChoiceItems(getEntries(), preselect, this);
+
+        PreferenceManager pm = getPreferenceManager();
+        try {
+            Method method = pm.getClass().getDeclaredMethod(
+                    "registerOnActivityDestroyListener",
+                    PreferenceManager.OnActivityDestroyListener.class);
+            method.setAccessible(true);
+            method.invoke(pm, this);
+        } catch (Exception e) {
+            // no way to handle this but logging it
+            Log_OC.e(TAG, "error invoking registerOnActivityDestroyListener", e);
+        }
+
+        mDialog = builder.create();
+        if (state != null) {
+            mDialog.onRestoreInstanceState(state);
+        }
+        mDialog.show();
+    }
+
+    @Override
+    public void onClick(DialogInterface dialog, int which) {
+        if (which >= 0 && getEntryValues() != null) {
+            String value = getEntryValues()[which].toString();
+            if (callChangeListener(value)) {
+                setValue(value);
+            }
+            dialog.dismiss();
+        }
+    }
+
+    @Override
+    public AppCompatDialog getDialog() {
+        return mDialog;
+    }
+
+    @Override
+    public void onActivityDestroy() {
+        super.onActivityDestroy();
+        if (mDialog != null && mDialog.isShowing()) {
+            mDialog.dismiss();
+        }
+    }
+}