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| 1 | +/* |
| 2 | + * Copyright 2012 The Android Open Source Project |
| 3 | + * |
| 4 | + * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | + * you may not use this file except in compliance with the License. |
| 6 | + * You may obtain a copy of the License at |
| 7 | + * |
| 8 | + * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | + * |
| 10 | + * Unless required by applicable law or agreed to in writing, software |
| 11 | + * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | + * See the License for the specific language governing permissions and |
| 14 | + * limitations under the License. |
| 15 | + */ |
| 16 | + |
| 17 | +package servicestack.net.androidclient; |
| 18 | + |
| 19 | +import android.app.ActionBar; |
| 20 | +import android.content.Intent; |
| 21 | +import android.os.Bundle; |
| 22 | +import android.support.v4.app.Fragment; |
| 23 | +import android.support.v4.app.FragmentActivity; |
| 24 | +import android.support.v4.app.FragmentManager; |
| 25 | +import android.support.v4.app.FragmentStatePagerAdapter; |
| 26 | +import android.support.v4.app.NavUtils; |
| 27 | +import android.support.v4.app.TaskStackBuilder; |
| 28 | +import android.support.v4.view.ViewPager; |
| 29 | +import android.view.LayoutInflater; |
| 30 | +import android.view.MenuItem; |
| 31 | +import android.view.View; |
| 32 | +import android.view.ViewGroup; |
| 33 | +import android.widget.TextView; |
| 34 | + |
| 35 | +public class CollectionDemoActivity extends FragmentActivity { |
| 36 | + |
| 37 | + /** |
| 38 | + * The {@link android.support.v4.view.PagerAdapter} that will provide fragments representing |
| 39 | + * each object in a collection. We use a {@link android.support.v4.app.FragmentStatePagerAdapter} |
| 40 | + * derivative, which will destroy and re-create fragments as needed, saving and restoring their |
| 41 | + * state in the process. This is important to conserve memory and is a best practice when |
| 42 | + * allowing navigation between objects in a potentially large collection. |
| 43 | + */ |
| 44 | + DemoCollectionPagerAdapter mDemoCollectionPagerAdapter; |
| 45 | + |
| 46 | + /** |
| 47 | + * The {@link android.support.v4.view.ViewPager} that will display the object collection. |
| 48 | + */ |
| 49 | + ViewPager mViewPager; |
| 50 | + |
| 51 | + public void onCreate(Bundle savedInstanceState) { |
| 52 | + super.onCreate(savedInstanceState); |
| 53 | + setContentView(R.layout.activity_collection_demo); |
| 54 | + |
| 55 | + // Create an adapter that when requested, will return a fragment representing an object in |
| 56 | + // the collection. |
| 57 | + // |
| 58 | + // ViewPager and its adapters use support library fragments, so we must use |
| 59 | + // getSupportFragmentManager. |
| 60 | + mDemoCollectionPagerAdapter = new DemoCollectionPagerAdapter(getSupportFragmentManager()); |
| 61 | + |
| 62 | + // Set up action bar. |
| 63 | + final ActionBar actionBar = getActionBar(); |
| 64 | + |
| 65 | + // Specify that the Home button should show an "Up" caret, indicating that touching the |
| 66 | + // button will take the user one step up in the application's hierarchy. |
| 67 | + actionBar.setDisplayHomeAsUpEnabled(true); |
| 68 | + |
| 69 | + // Set up the ViewPager, attaching the adapter. |
| 70 | + mViewPager = (ViewPager) findViewById(R.id.pager); |
| 71 | + mViewPager.setAdapter(mDemoCollectionPagerAdapter); |
| 72 | + } |
| 73 | + |
| 74 | + @Override |
| 75 | + public boolean onOptionsItemSelected(MenuItem item) { |
| 76 | + switch (item.getItemId()) { |
| 77 | + case android.R.id.home: |
| 78 | + // This is called when the Home (Up) button is pressed in the action bar. |
| 79 | + // Create a simple intent that starts the hierarchical parent activity and |
| 80 | + // use NavUtils in the Support Package to ensure proper handling of Up. |
| 81 | + Intent upIntent = new Intent(this, MainActivity.class); |
| 82 | + if (NavUtils.shouldUpRecreateTask(this, upIntent)) { |
| 83 | + // This activity is not part of the application's task, so create a new task |
| 84 | + // with a synthesized back stack. |
| 85 | + TaskStackBuilder.from(this) |
| 86 | + // If there are ancestor activities, they should be added here. |
| 87 | + .addNextIntent(upIntent) |
| 88 | + .startActivities(); |
| 89 | + finish(); |
| 90 | + } else { |
| 91 | + // This activity is part of the application's task, so simply |
| 92 | + // navigate up to the hierarchical parent activity. |
| 93 | + NavUtils.navigateUpTo(this, upIntent); |
| 94 | + } |
| 95 | + return true; |
| 96 | + } |
| 97 | + return super.onOptionsItemSelected(item); |
| 98 | + } |
| 99 | + |
| 100 | + /** |
| 101 | + * A {@link android.support.v4.app.FragmentStatePagerAdapter} that returns a fragment |
| 102 | + * representing an object in the collection. |
| 103 | + */ |
| 104 | + public static class DemoCollectionPagerAdapter extends FragmentStatePagerAdapter { |
| 105 | + |
| 106 | + public DemoCollectionPagerAdapter(FragmentManager fm) { |
| 107 | + super(fm); |
| 108 | + } |
| 109 | + |
| 110 | + @Override |
| 111 | + public Fragment getItem(int i) { |
| 112 | + Fragment fragment = new DemoObjectFragment(); |
| 113 | + Bundle args = new Bundle(); |
| 114 | + args.putInt(DemoObjectFragment.ARG_OBJECT, i + 1); // Our object is just an integer :-P |
| 115 | + fragment.setArguments(args); |
| 116 | + return fragment; |
| 117 | + } |
| 118 | + |
| 119 | + @Override |
| 120 | + public int getCount() { |
| 121 | + // For this contrived example, we have a 100-object collection. |
| 122 | + return 100; |
| 123 | + } |
| 124 | + |
| 125 | + @Override |
| 126 | + public CharSequence getPageTitle(int position) { |
| 127 | + return "OBJECT " + (position + 1); |
| 128 | + } |
| 129 | + } |
| 130 | + |
| 131 | + /** |
| 132 | + * A dummy fragment representing a section of the app, but that simply displays dummy text. |
| 133 | + */ |
| 134 | + public static class DemoObjectFragment extends Fragment { |
| 135 | + |
| 136 | + public static final String ARG_OBJECT = "object"; |
| 137 | + |
| 138 | + @Override |
| 139 | + public View onCreateView(LayoutInflater inflater, ViewGroup container, |
| 140 | + Bundle savedInstanceState) { |
| 141 | + View rootView = inflater.inflate(R.layout.fragment_collection_object, container, false); |
| 142 | + Bundle args = getArguments(); |
| 143 | + ((TextView) rootView.findViewById(android.R.id.text1)).setText( |
| 144 | + Integer.toString(args.getInt(ARG_OBJECT))); |
| 145 | + return rootView; |
| 146 | + } |
| 147 | + } |
| 148 | +} |
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