Add a time period dropdown to the CBD dialog on Android.

chrome/android/java/src/org/chromium/chrome/browser/preferences/SpinnerPreference.java

Index: chrome/android/java/src/org/chromium/chrome/browser/preferences/SpinnerPreference.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/preferences/SpinnerPreference.java b/chrome/android/java/src/org/chromium/chrome/browser/preferences/SpinnerPreference.java
new file mode 100644
index 0000000000000000000000000000000000000000..ff8b6e09fa491c68ab3056a6e921f56a8c57c27a
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/preferences/SpinnerPreference.java
@@ -0,0 +1,87 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.chrome.browser.preferences;
+
+import android.content.Context;
+import android.preference.Preference;
+import android.util.AttributeSet;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.AdapterView;
+import android.widget.ArrayAdapter;
+import android.widget.Spinner;
+import android.widget.TextView;
+
+import org.chromium.chrome.R;
+
+/**
+ * A preference that takes value from a specified list of objects, presented as a dropdown.
+ */
+public class SpinnerPreference extends Preference {
+    private Spinner mSpinner;
+    private ArrayAdapter<Object> mAdapter;
+    private int mSelectedIndex;
+
+    /**
+     * Constructor for inflating from XML.
+     */
+    public SpinnerPreference(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        setLayoutResource(R.layout.preference_spinner);
+    }
+
+    /**
+     * Provides a list of arbitrary objects to be shown in the spinner. Visually, each option will
+     * be presented as its toString() text.
+     * @param options The options to be shown in the spinner.
+     * @param selectedIndex Index of the initially selected option.
+     */
+    public void setOptions(Object[] options, int selectedIndex) {
+        mAdapter = new ArrayAdapter<Object>(
+                getContext(), android.R.layout.simple_spinner_item, options);
+        mAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
+        mSelectedIndex = selectedIndex;
+    }
+
+    /**
+     * @return The currently selected option.
+     */
+    public Object getSelectedOption() {
+        if (mSpinner == null) return null;
+        return mSpinner.getSelectedItem();
+    }
+
+    @Override
+    public View onCreateView(ViewGroup parent) {
+        View view = super.onCreateView(parent);
+
+        ((TextView) view.findViewById(R.id.title)).setText(getTitle());
+        mSpinner = (Spinner) view.findViewById(R.id.spinner);
+        mSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
+            @Override
+            public void onItemSelected(
+                    AdapterView<?> parent, View view, int position, long id) {
+                mSelectedIndex = position;
+                if (getOnPreferenceChangeListener() != null) {
+                    getOnPreferenceChangeListener().onPreferenceChange(
+                            SpinnerPreference.this, getSelectedOption());
+                }
+            }
+
+            @Override
+            public void onNothingSelected(AdapterView<?> parent) {
+                // No callback. Only update listeners when an actual option is selected.
+            }
+        });
+
+        return view;
+    }
+
+    @Override
+    protected void onBindView(View view) {
+        mSpinner.setAdapter(mAdapter);
+        mSpinner.setSelection(mSelectedIndex);
+    }
+}