Allow DpcPerference minimum SDK version to be set.

Change-Id: I638a59fb5c59585b9532223366678f22f7ad1103

Author: AndrewScull

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

@@ -68,6 +68,11 @@ public void setEnabled(boolean enabled) {
         super.setEnabled(enabled);
     }
 
+    @Override
+    public void setMinSdkVersion(int version) {
+        mHelper.setMinSdkVersion(version);
+    }
+
     @Override
     public void setAdminConstraint(int adminConstraint) {
         mHelper.setAdminConstraint(adminConstraint);

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

@@ -68,6 +68,11 @@ public void setEnabled(boolean enabled) {
         super.setEnabled(enabled);
     }
 
+    @Override
+    public void setMinSdkVersion(int version) {
+        mHelper.setMinSdkVersion(version);
+    }
+
     @Override
     public void setAdminConstraint(int adminConstraint) {
         mHelper.setAdminConstraint(adminConstraint);

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

@@ -68,6 +68,11 @@ public void setEnabled(boolean enabled) {
         super.setEnabled(enabled);
     }
 
+    @Override
+    public void setMinSdkVersion(int version) {
+        mHelper.setMinSdkVersion(version);
+    }
+
     @Override
     public void setAdminConstraint(int adminConstraint) {
         mHelper.setAdminConstraint(adminConstraint);

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

@@ -22,6 +22,7 @@
  * Common base class for the DpcPreference family of classes.
  */
 public interface DpcPreferenceBase {
+    void setMinSdkVersion(int version);
     void setAdminConstraint(int adminConstraint);
     void clearAdminConstraint();
     void setUserConstraint(int userConstraints);

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

@@ -49,7 +49,7 @@ public class DpcPreferenceHelper {
 
     private CharSequence mConstraintViolationSummary = null;
     private CharSequence mCustomConstraintSummary = null;
-    private final int mMinSdkVersion;
+    private int mMinSdkVersion;
     private int mAdminConstraint;
     private int mUserConstraint;
 
@@ -73,6 +73,10 @@ public DpcPreferenceHelper(Context context, Preference preference, AttributeSet
         final TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.DpcPreference);
 
         mMinSdkVersion = a.getInt(R.styleable.DpcPreference_minSdkVersion, 0);
+        if (attrs == null) {
+            // Be more lenient when creating the preference from code
+            mMinSdkVersion = Build.VERSION_CODES.LOLLIPOP;
+        }
         if (mMinSdkVersion == 0) {
             throw new RuntimeException("testdpc:minSdkVersion must be specified.");
         }
@@ -100,6 +104,16 @@ public void onAttachedToHierarchy() {
         disableIfConstraintsNotMet();
     }
 
+    /**
+     * Set the minimum required API level constraint.
+     *
+     * @param version The minimum required version.
+     */
+    public void setMinSdkVersion(int version) {
+        mMinSdkVersion = version;
+        disableIfConstraintsNotMet();
+    }
+
     /**
      * Set constraints on the admin.
      *

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

@@ -68,6 +68,11 @@ public void setEnabled(boolean enabled) {
         super.setEnabled(enabled);
     }
 
+    @Override
+    public void setMinSdkVersion(int version) {
+        mHelper.setMinSdkVersion(version);
+    }
+
     @Override
     public void setAdminConstraint(int adminConstraint) {
         mHelper.setAdminConstraint(adminConstraint);