Add maxTargetSdk restriction to unused APIs.

These are APIs that have @UnsupportedAppUsage but for which we don't
have any evidence of them currently being used, so should be safe to
remove from the unsupported list.

Bug: 170729553
Test: Treehugger
Change-Id: I4c8fd0006f950de9955242e93968fb0996ceb372

core/java/android/preference/PreferenceActivity.java

@@ -31,6 +31,7 @@ import android.content.Intent;
 import android.content.res.Resources;
 import android.content.res.TypedArray;
 import android.content.res.XmlResourceParser;
+import android.os.Build;
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.Message;
@@ -728,7 +729,7 @@ public abstract class PreferenceActivity extends ListActivity implements
      * Returns the Header list
      * @hide
      */
-    @UnsupportedAppUsage
+    @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
     public List<Header> getHeaders() {
         return mHeaders;
     }

core/java/android/preference/PreferenceFragment.java

@@ -24,6 +24,7 @@ import android.compat.annotation.UnsupportedAppUsage;
 import android.content.Intent;
 import android.content.SharedPreferences;
 import android.content.res.TypedArray;
+import android.os.Build;
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.Message;
@@ -103,7 +104,7 @@ public abstract class PreferenceFragment extends Fragment implements
 
     private static final String PREFERENCES_TAG = "android:preferences";
 
-    @UnsupportedAppUsage
+    @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
     private PreferenceManager mPreferenceManager;
     private ListView mList;
     private boolean mHavePrefs;

core/java/android/preference/PreferenceScreen.java

@@ -22,6 +22,7 @@ import android.content.Context;
 import android.content.DialogInterface;
 import android.content.res.TypedArray;
 import android.graphics.drawable.Drawable;
+import android.os.Build;
 import android.os.Bundle;
 import android.os.Parcel;
 import android.os.Parcelable;
@@ -102,7 +103,7 @@ public final class PreferenceScreen extends PreferenceGroup implements AdapterVi
     
     private Dialog mDialog;
 
-    @UnsupportedAppUsage
+    @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
     private ListView mListView;
 
     private int mLayoutResId = com.android.internal.R.layout.preference_list_fragment;

core/java/android/preference/SeekBarPreference.java

@@ -19,6 +19,7 @@ package android.preference;
 import android.compat.annotation.UnsupportedAppUsage;
 import android.content.Context;
 import android.content.res.TypedArray;
+import android.os.Build;
 import android.os.Parcel;
 import android.os.Parcelable;
 import android.util.AttributeSet;
@@ -73,7 +74,7 @@ public class SeekBarPreference extends Preference
         this(context, attrs, com.android.internal.R.attr.seekBarPreferenceStyle);
     }
 
-    @UnsupportedAppUsage
+    @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
     public SeekBarPreference(Context context) {
         this(context, null);
     }

core/java/android/preference/SwitchPreference.java

@@ -20,6 +20,7 @@ import android.annotation.StringRes;
 import android.compat.annotation.UnsupportedAppUsage;
 import android.content.Context;
 import android.content.res.TypedArray;
+import android.os.Build;
 import android.util.AttributeSet;
 import android.view.View;
 import android.widget.Checkable;
@@ -45,7 +46,7 @@ import android.widget.Switch;
  */
 @Deprecated
 public class SwitchPreference extends TwoStatePreference {
-    @UnsupportedAppUsage
+    @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
     private final Listener mListener = new Listener();
 
     // Switch text for on and off states