Adding new samples to browseable section of DAC

Change-Id: I58e10e787f5df668331fc04e97a6c2efcd75f76f

samples/browseable/BatchStepSensor/src/com.example.android.batchstepsensor/MainActivity.java

@@ -0,0 +1,91 @@
+/*
+* Copyright 2013 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.batchstepsensor;
+
+import android.os.Bundle;
+import android.support.v4.app.FragmentManager;
+import android.support.v4.app.FragmentTransaction;
+import android.view.Menu;
+
+import com.example.android.common.activities.SampleActivityBase;
+import com.example.android.common.logger.Log;
+
+public class MainActivity extends SampleActivityBase implements CardStream {
+    public static final String TAG = "MainActivity";
+    public static final String FRAGTAG = "BatchStepSensorFragment";
+
+    private CardStreamFragment mCardStreamFragment;
+
+    private StreamRetentionFragment mRetentionFragment;
+    private static final String RETENTION_TAG = "retention";
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+
+        FragmentManager fm = getSupportFragmentManager();
+        BatchStepSensorFragment fragment =
+                (BatchStepSensorFragment) fm.findFragmentByTag(FRAGTAG);
+
+        if (fragment == null) {
+            FragmentTransaction transaction = fm.beginTransaction();
+            fragment = new BatchStepSensorFragment();
+            transaction.add(fragment, FRAGTAG);
+            transaction.commit();
+        }
+
+        // Use fragment as click listener for cards, but must implement correct interface
+        if(!(fragment instanceof OnCardClickListener)){
+            throw new ClassCastException("BatchStepSensorFragment must " +
+                    "implement OnCardClickListener interface.");
+        }
+        OnCardClickListener clickListener = (OnCardClickListener) fm.findFragmentByTag(FRAGTAG);
+
+        mRetentionFragment = (StreamRetentionFragment) fm.findFragmentByTag(RETENTION_TAG);
+        if (mRetentionFragment == null) {
+            mRetentionFragment = new StreamRetentionFragment();
+            fm.beginTransaction().add(mRetentionFragment, RETENTION_TAG).commit();
+        } else {
+            // If the retention fragment already existed, we need to pull some state.
+            // pull state out
+            CardStreamState state = mRetentionFragment.getCardStream();
+
+            // dump it in CardStreamFragment.
+            mCardStreamFragment =
+                    (CardStreamFragment) fm.findFragmentById(R.id.fragment_cardstream);
+            mCardStreamFragment.restoreState(state, clickListener);
+        }
+    }
+
+    public CardStreamFragment getCardStream() {
+        if (mCardStreamFragment == null) {
+            mCardStreamFragment = (CardStreamFragment)
+                    getSupportFragmentManager().findFragmentById(R.id.fragment_cardstream);
+        }
+        return mCardStreamFragment;
+    }
+
+    @Override
+    protected void onSaveInstanceState(Bundle outState) {
+        super.onSaveInstanceState(outState);
+        CardStreamState state = getCardStream().dumpState();
+        mRetentionFragment.storeCardStream(state);
+    }
+}