Introduce an interface for DpcPreferences.

The common interface allows abstraction over different DpcPreference
types. This allows constraints to be set regardless of whether it is a
switch of a normal preference.

Change-Id: Ic7054c9def68d3c59580642027071c048f94e893

Author: AndrewScull

app/src/main/java/com/afwsamples/testdpc/common/preference/DpcEditTextPreference.java

@@ -28,7 +28,7 @@
  *
  * See {@link DpcPreferenceHelper} for details about constraints.
  */
-public class DpcEditTextPreference extends EditTextPreference {
+public class DpcEditTextPreference extends EditTextPreference implements DpcPreferenceBase {
     private DpcPreferenceHelper mHelper;
 
     public DpcEditTextPreference(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
@@ -68,34 +68,42 @@ public void setEnabled(boolean enabled) {
         super.setEnabled(enabled);
     }
 
+    @Override
     public void setAdminConstraint(int adminConstraint) {
         mHelper.setAdminConstraint(adminConstraint);
     }
 
+    @Override
     public void clearAdminConstraint() {
         mHelper.clearAdminConstraint();
     }
 
+    @Override
     public void setUserConstraint(int userConstraints) {
         mHelper.setUserConstraint(userConstraints);
     }
 
+    @Override
     public void clearUserConstraint() {
         mHelper.clearUserConstraint();
     }
 
+    @Override
     public void clearNonCustomConstraints() {
         mHelper.clearNonCustomConstraints();
     }
 
+    @Override
     public void setCustomConstraint(CharSequence constraintSummary) {
         mHelper.setCustomConstraint(constraintSummary);
     }
 
+    @Override
     public void setCustomConstraint(@StringRes int constraintSummaryRes) {
         mHelper.setCustomConstraint(getContext().getString(constraintSummaryRes));
     }
 
+    @Override
     public void clearCustomConstraint() {
         mHelper.clearCustomConstraint();
     }

app/src/main/java/com/afwsamples/testdpc/common/preference/DpcListPreference.java

@@ -28,7 +28,7 @@
  *
  * See {@link DpcPreferenceHelper} for details about constraints.
  */
-public class DpcListPreference extends ListPreference {
+public class DpcListPreference extends ListPreference implements DpcPreferenceBase {
     private DpcPreferenceHelper mHelper;
 
     public DpcListPreference(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
@@ -68,34 +68,42 @@ public void setEnabled(boolean enabled) {
         super.setEnabled(enabled);
     }
 
+    @Override
     public void setAdminConstraint(int adminConstraint) {
         mHelper.setAdminConstraint(adminConstraint);
     }
 
+    @Override
     public void clearAdminConstraint() {
         mHelper.clearAdminConstraint();
     }
 
+    @Override
     public void setUserConstraint(int userConstraints) {
         mHelper.setUserConstraint(userConstraints);
     }
 
+    @Override
     public void clearUserConstraint() {
         mHelper.clearUserConstraint();
     }
 
+    @Override
     public void clearNonCustomConstraints() {
         mHelper.clearNonCustomConstraints();
     }
 
+    @Override
     public void setCustomConstraint(CharSequence constraintSummary) {
         mHelper.setCustomConstraint(constraintSummary);
     }
 
+    @Override
     public void setCustomConstraint(@StringRes int constraintSummaryRes) {
         mHelper.setCustomConstraint(getContext().getString(constraintSummaryRes));
     }
 
+    @Override
     public void clearCustomConstraint() {
         mHelper.clearCustomConstraint();
     }

app/src/main/java/com/afwsamples/testdpc/common/preference/DpcPreference.java

@@ -28,7 +28,7 @@
  *
  * See {@link DpcPreferenceHelper} for details about constraints.
  */
-public class DpcPreference extends Preference {
+public class DpcPreference extends Preference implements DpcPreferenceBase {
     private DpcPreferenceHelper mHelper;
 
     public DpcPreference(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
@@ -68,34 +68,42 @@ public void setEnabled(boolean enabled) {
         super.setEnabled(enabled);
     }
 
+    @Override
     public void setAdminConstraint(int adminConstraint) {
         mHelper.setAdminConstraint(adminConstraint);
     }
 
+    @Override
     public void clearAdminConstraint() {
         mHelper.clearAdminConstraint();
     }
 
+    @Override
     public void setUserConstraint(int userConstraints) {
         mHelper.setUserConstraint(userConstraints);
     }
 
+    @Override
     public void clearUserConstraint() {
         mHelper.clearUserConstraint();
     }
 
+    @Override
     public void clearNonCustomConstraints() {
         mHelper.clearNonCustomConstraints();
     }
 
+    @Override
     public void setCustomConstraint(CharSequence constraintSummary) {
         mHelper.setCustomConstraint(constraintSummary);
     }
 
+    @Override
     public void setCustomConstraint(@StringRes int constraintSummaryRes) {
         mHelper.setCustomConstraint(getContext().getString(constraintSummaryRes));
     }
 
+    @Override
     public void clearCustomConstraint() {
         mHelper.clearCustomConstraint();
     }

app/src/main/java/com/afwsamples/testdpc/common/preference/DpcPreferenceBase.java

@@ -0,0 +1,33 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.afwsamples.testdpc.common.preference;
+
+import android.support.annotation.StringRes;
+
+/**
+ * Common base class for the DpcPreference family of classes.
+ */
+public interface DpcPreferenceBase {
+    void setAdminConstraint(int adminConstraint);
+    void clearAdminConstraint();
+    void setUserConstraint(int userConstraints);
+    void clearUserConstraint();
+    void clearNonCustomConstraints();
+    void setCustomConstraint(CharSequence constraintSummary);
+    void setCustomConstraint(@StringRes int constraintSummaryRes);
+    void clearCustomConstraint();
+}

app/src/main/java/com/afwsamples/testdpc/common/preference/DpcSwitchPreference.java

@@ -28,7 +28,7 @@
  *
  * See {@link DpcPreferenceHelper} for details about constraints.
  */
-public class DpcSwitchPreference extends SwitchPreference {
+public class DpcSwitchPreference extends SwitchPreference implements DpcPreferenceBase {
     private DpcPreferenceHelper mHelper;
 
     public DpcSwitchPreference(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
@@ -68,34 +68,42 @@ public void setEnabled(boolean enabled) {
         super.setEnabled(enabled);
     }
 
+    @Override
     public void setAdminConstraint(int adminConstraint) {
         mHelper.setAdminConstraint(adminConstraint);
     }
 
+    @Override
     public void clearAdminConstraint() {
         mHelper.clearAdminConstraint();
     }
 
+    @Override
     public void setUserConstraint(int userConstraints) {
         mHelper.setUserConstraint(userConstraints);
     }
 
+    @Override
     public void clearUserConstraint() {
         mHelper.clearUserConstraint();
     }
 
+    @Override
     public void clearNonCustomConstraints() {
         mHelper.clearNonCustomConstraints();
     }
 
+    @Override
     public void setCustomConstraint(CharSequence constraintSummary) {
         mHelper.setCustomConstraint(constraintSummary);
     }
 
+    @Override
     public void setCustomConstraint(@StringRes int constraintSummaryRes) {
         mHelper.setCustomConstraint(getContext().getString(constraintSummaryRes));
     }
 
+    @Override
     public void clearCustomConstraint() {
         mHelper.clearCustomConstraint();
     }