Drawer Layout 与 Fragment的组合使用

最新推荐文章于 2025-06-04 13:58:38 发布

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本文探讨了如何在Android应用中结合使用Drawer Layout和Fragment，通过实例展示了它们在多个APP中的常见应用。详细介绍了布局文件如activity_main.xml、drawer_list.xml、fragment_oil.xml和fragment_item1.xml的结构，并讲解了MainActivity的设置，包括监听和Fragment的管理。同时强调了在Fragment中操作控件的注意事项，如必须的空构造函数、在onActivityCreated中的控件初始化等。

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现在Drawer Layout 与 Fragment在很多APP中都有出现，所以写篇博客，自己总结下。

先上两张Weico和豆瓣FM的效果图。

下面是测试的DemoApp

首先是布局。Demo用到了四个xml文件：activity_main.xml、drawer_list.xml、fragment_oil.xml、fragment_item1.xml

activity_main.xml为整体的布局，里面包含两块：<FrameLayout>用于显示主题体内容，<ListView>用于显示侧栏

fragment_oil为选择油量查询弹出的Fragment，fragment_item1为选择item1弹出额Fragment

接下来是MainActivity

mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerList = (ListView) findViewById(R.id.left_drawer);

设置list选项、监听

// set up the drawer's list view with items and click listener
mDrawerList.setAdapter(new ArrayAdapter<String>(this,R.layout.drawer_list_item, mCarpTitles));
mDrawerList.setOnItemClickListener(new DrawerItemClickListener());

上面用到了自定义的类DraweItemClickListener，下面定义这个类

/* The click listner for ListView in the navigation drawer */
	private class DrawerItemClickListener implements
			ListView.OnItemClickListener {
		@Override
		public void onItemClick(AdapterView<?> parent, View view, int position,
				long id) {
			selectItem(position);
		}
	}
	private void selectItem(int position) {
		String carpString = null;
		switch (position) {
		case 0:
			// update the main content by replacing fragments
			Fragment oilFragment = new OilFragment();
			FragmentManager fragmentManager = getFragmentManager();
			fragmentManager.beginTransaction()
					.replace(R.id.content_frame, oilFragment).commit();
			break;
		case 1:
			// update the main content by replacing fragments
			Fragment item1Fragment = new Item1Fragment();
			FragmentManager fragmentManager1 = getFragmentManager();
			fragmentManager1.beginTransaction()
					.replace(R.id.content_frame, item1Fragment).commit();
			break;
		default:
			break;
		}
		//close the drawer
		mDrawerLayout.closeDrawer(mDrawerList);
	}

OilFragment和Item1Fragment是定义的类，继承自Fragment。

注意点：

1.空的构造函数是必须的；

2.对于Fragment内的控件的操作，放在onActivityCreated中；

3.或许控件需要使用getview()

4.填充布局，也就是fragment_oil.xml、fragment_item1.xml

public static class OilFragment extends Fragment {
		public OilFragment() {
			// Empty constructor required for fragment subclasses
		}
		@Override
		public void onActivityCreated(Bundle savedInstanceState) {
			// TODO Auto-generated method stub
			super.onActivityCreated(savedInstanceState);
			Button mConsumeOilButton = (Button) getView().findViewById(
					R.id.button1);
			mProgress = (ProgressBar) getView().findViewById(R.id.progressBar1);
			showOilTextView = (TextView) getView().findViewById(R.id.textView1);
			mConsumeOilButton.setOnClickListener(new View.OnClickListener() {
				@Override
				public void onClick(View v) {
					new UpdateProgressBar().execute();
					// 启动线程，检测油量，当低于20%的时候，发送notification
					Intent intent = new Intent(getActivity(),
							OilDetectService.class);
					getActivity().startService(intent);
				}
			});
		}
		@Override
		public View onCreateView(LayoutInflater inflater, ViewGroup container,
				Bundle savedInstanceState) {
			View rootView = inflater.inflate(R.layout.fragment_oil, container,
					false);
			return rootView;
		}
	}

上面用到了UpdateProcessBar extends AsyncTask,用于消耗油量。另外开启了一个Service，当油量少于20%的时候，发出Notification

下面是Service，继承自IntentService。构造函数和onHandleIntent是必须的，onHandleIntent的形参intent是startService传递过来的（这里并没用到）

public class OilDetectService extends IntentService {
	public OilDetectService() {
		super("OilDetectService");
		// TODO Auto-generated constructor stub
	}
	@Override
	protected void onHandleIntent(Intent intent) {
		while (20<MainActivity.mProgressStatus) {
		}
		NotificationManager notificationManager = (NotificationManager) super.getSystemService(Activity.NOTIFICATION_SERVICE);
		Notification notification = new Notification.Builder(this)
        .setContentTitle("警告")
        .setContentText("油量低于20%，请及时加油")
        .setSmallIcon(R.drawable.ic_launcher)
        .build();
		//notification.flags = Notification.FLAG_AUTO_CANCEL;
		notificationManager.notify(null,1,notification);
	}
}