API demo for new Activity.recreate() API.

Change-Id: I56bd36edf2cd5cd9b6f95dd4a2b82571689c04d2

samples/ApiDemos/AndroidManifest.xml

@@ -151,6 +151,14 @@
             </intent-filter>
         </activity>
 
+        <activity android:name=".app.ActivityRecreate"
+                android:label="@string/activity_recreate">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.SAMPLE_CODE" />
+            </intent-filter>
+        </activity>
+
         <activity android:name=".app.SoftInputModes"
                 android:label="@string/soft_input_modes">
             <intent-filter>

samples/ApiDemos/res/layout/activity_recreate.xml

@@ -0,0 +1,37 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2010 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.
+-->
+
+<!-- Demonstrates starting and stopping a local service.
+     See corresponding Java code com.android.sdk.app.LocalSerice.java. -->
+
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:orientation="vertical" android:padding="4dip"
+    android:gravity="center_horizontal"
+    android:layout_width="match_parent" android:layout_height="match_parent">
+
+    <TextView
+        android:layout_width="match_parent" android:layout_height="wrap_content"
+        android:layout_weight="0"
+        android:paddingBottom="4dip"
+        android:text="@string/activity_recreate_msg"/>
+
+    <Button android:id="@+id/recreate"
+        android:layout_width="wrap_content" android:layout_height="wrap_content"
+        android:text="@string/recreate">
+        <requestFocus />
+    </Button>
+
+</LinearLayout>

samples/ApiDemos/res/values/strings.xml

@@ -80,6 +80,11 @@
     <string name="activity_persistent">App/Activity/Persistent State</string>
     <string name="persistent_msg">Demonstration of persistent activity state with getPreferences(0).edit() and getPreferences(0).</string>
 
+    <string name="activity_recreate">App/Activity/Recreate</string>
+    <string name="activity_recreate_msg">Demonstration recreating an activity, to have
+        it reconstructed with significant new changes.  In this case the theme is changed.</string>
+    <string name="recreate">Recreate</string>
+
     <string name="activity_receive_result">App/Activity/Receive Result</string>
     <string name="pick_result">Pick a result to send, or BACK to cancel.</string>
     <string name="corky">Corky</string>

samples/ApiDemos/src/com/example/android/apis/app/ActivityRecreate.java

@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2010 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.example.android.apis.app;
+
+import com.example.android.apis.R;
+import com.example.android.apis.app.LocalServiceActivities.Controller;
+
+import android.app.Activity;
+import android.content.Intent;
+import android.os.Bundle;
+import android.util.Log;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.widget.Button;
+
+public class ActivityRecreate extends Activity {
+    int mCurTheme;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        if (savedInstanceState != null) {
+            mCurTheme = savedInstanceState.getInt("theme");
+
+            // Switch to a new theme different from last theme.
+            switch (mCurTheme) {
+                case android.R.style.Theme_Holo_Light:
+                    mCurTheme = android.R.style.Theme_Holo_Dialog;
+                    break;
+                case android.R.style.Theme_Holo_Dialog:
+                    mCurTheme = android.R.style.Theme_Holo;
+                    break;
+                default:
+                    mCurTheme = android.R.style.Theme_Holo_Light;
+                    break;
+            }
+            setTheme(mCurTheme);
+        }
+
+        setContentView(R.layout.activity_recreate);
+
+        // Watch for button clicks.
+        Button button = (Button)findViewById(R.id.recreate);
+        button.setOnClickListener(mRecreateListener);
+    }
+
+    @Override
+    protected void onSaveInstanceState(Bundle savedInstanceState) {
+        super.onSaveInstanceState(savedInstanceState);
+        savedInstanceState.putInt("theme", mCurTheme);
+    }
+
+    private OnClickListener mRecreateListener = new OnClickListener() {
+        public void onClick(View v) {
+            recreate();
+        }
+    };
+}