New sample code for fragment support library.

Also tweak a few things to make the demos run on Donut.

Change-Id: I298fdf8fb0f12ee6db10e66657a22e19a527811a

samples/ApiDemos/src/com/example/android/apis/view/CheckableFrameLayout.java

@@ -0,0 +1,49 @@
+/*
+ * 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.view;
+
+import android.content.Context;
+import android.graphics.drawable.ColorDrawable;
+import android.util.AttributeSet;
+import android.widget.Checkable;
+import android.widget.FrameLayout;
+
+public class CheckableFrameLayout extends FrameLayout implements Checkable {
+    private boolean mChecked;
+
+    public CheckableFrameLayout(Context context) {
+        super(context);
+    }
+
+    public CheckableFrameLayout(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    public void setChecked(boolean checked) {
+        mChecked = checked;
+        setBackgroundDrawable(checked ? new ColorDrawable(0xff0000a0) : null);
+    }
+
+    public boolean isChecked() {
+        return mChecked;
+    }
+
+    public void toggle() {
+        setChecked(!mChecked);
+    }
+
+}