[Fingerprint] Make enroll progress bar scalable

Make the fingerprint enroll progress bar scalable by moving it to a
single FingerprintProgressBar view and make it fill the remaining
space.

- The background fingerprint icon was changed to include the padding
internally so it can be added as the background directly onto the
progress bar view.
- The icon in landscape mode is also fixed to use the fingerprint
icon rather than the lock icon.

Test: cd tests/robotests && mm
Bug: 32123370
Change-Id: Ia5cf37d92f0af7c1cf39287f5070c44f51d44878

src/com/android/settings/widget/RingProgressBar.java

@@ -0,0 +1,57 @@
+/*
+ * 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.android.settings.widget;
+
+import android.content.Context;
+import android.util.AttributeSet;
+import android.widget.ProgressBar;
+
+import com.android.settings.R;
+
+/**
+ * A (determinate) progress bar in the form of a ring. The progress bar goes clockwise starting
+ * from the 12 o'clock position. This view maintain equal width and height using a strategy similar
+ * to "centerInside" for ImageView.
+ */
+public class RingProgressBar extends ProgressBar {
+
+    public RingProgressBar(Context context) {
+        this(context, null);
+    }
+
+    public RingProgressBar(Context context, AttributeSet attrs) {
+        this(context, attrs, 0);
+    }
+
+    public RingProgressBar(Context context, AttributeSet attrs, int defStyleAttr) {
+        this(context, attrs, defStyleAttr, R.style.RingProgressBarStyle);
+    }
+
+    public RingProgressBar(Context context, AttributeSet attrs, int defStyleAttr,
+            int defStyleRes) {
+        super(context, attrs, defStyleAttr, defStyleRes);
+    }
+
+    @Override
+    protected synchronized void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
+        final int measuredHeight = getMeasuredHeight();
+        final int measuredWidth = getMeasuredWidth();
+        final int shortSide = Math.min(measuredHeight, measuredWidth);
+        setMeasuredDimension(shortSide, shortSide);
+    }
+}