Android使用Fragment实现兼容手机和平板的程序

目录

• 一
• 二
• 三
• 四

public class MainActivity extends Activity {
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
	}
}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="horizontal"
    tools:context=".MainActivity" >
    <fragment
        android:id="@+id/menu_fragment"
        android:name="com.example.fragmentdemo.MenuFragment"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        />
</LinearLayout>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="horizontal"
    android:baselineAligned="false"
    tools:context=".MainActivity"
    >
    <fragment
        android:id="@+id/left_fragment"
        android:name="com.example.fragmentdemo.MenuFragment"
        android:layout_width="0dip"
        android:layout_height="fill_parent"
        android:layout_weight="1"
        />
    <FrameLayout 
        android:id="@+id/details_layout"
        android:layout_width="0dip"
        android:layout_height="fill_parent"
        android:layout_weight="3"
        ></FrameLayout>
</LinearLayout>

public class MenuFragment extends Fragment implements OnItemClickListener {
	/**
	 * 菜单界面中只包含了一个ListView。
	 */
	private ListView menuList;
	/**
	 * ListView的适配器。
	 */
	private ArrayAdapter<String> adapter;
	/**
	 * 用于填充ListView的数据，这里就简单只用了两条数据。
	 */
	private String[] menuItems = { "Sound", "Display" };
	/**
	 * 是否是双页模式。如果一个Activity中包含了两个Fragment，就是双页模式。
	 */
	private boolean isTwoPane;
	/**
	 * 当Activity和Fragment建立关联时，初始化适配器中的数据。
	 */
	@Override
	public void onAttach(Activity activity) {
		super.onAttach(activity);
		adapter = new ArrayAdapter<String>(activity, android.R.layout.simple_list_item_1, menuItems);
	}
	/**
	 * 加载menu_fragment布局文件，为ListView绑定了适配器，并设置了监听事件。
	 */
	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
		View view = inflater.inflate(R.layout.menu_fragment, container, false);
		menuList = (ListView) view.findViewById(R.id.menu_list);
		menuList.setAdapter(adapter);
		menuList.setOnItemClickListener(this);
		return view;
	}
	/**
	 * 当Activity创建完毕后，尝试获取一下布局文件中是否有details_layout这个元素，如果有说明当前
	 * 是双页模式，如果没有说明当前是单页模式。
	 */
	@Override
	public void onActivityCreated(Bundle savedInstanceState) {
		super.onActivityCreated(savedInstanceState);
		if (getActivity().findViewById(R.id.details_layout) != null) {
			isTwoPane = true;
		} else {
			isTwoPane = false;
		}
	}
	/**
	 * 处理ListView的点击事件，会根据当前是否是双页模式进行判断。如果是双页模式，则会动态添加Fragment。
	 * 如果不是双页模式，则会打开新的Activity。
	 */
	@Override
	public void onItemClick(AdapterView<?> arg0, View view, int index, long arg3) {
		if (isTwoPane) {
			Fragment fragment = null;
			if (index == 0) {
				fragment = new SoundFragment();
			} else if (index == 1) {
				fragment = new DisplayFragment();
			}
			getFragmentManager().beginTransaction().replace(R.id.details_layout, fragment).commit();
		} else {
			Intent intent = null;
			if (index == 0) {
				intent = new Intent(getActivity(), SoundActivity.class);
			} else if (index == 1) {
				intent = new Intent(getActivity(), DisplayActivity.class);
			}
			startActivity(intent);
		}
	}
}

<?xml version="1.0" encoding="UTF-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
android:id="@+id/menu_list"
android:layout_width="fill_parent"
android:layout_height="fill_parent"

public class SoundFragment extends Fragment {
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
		View view = inflater.inflate(R.layout.sound_fragment, container, false);

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#00ff00"
    android:orientation="vertical" >
    <TextView 
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:textSize="28sp"
        android:textColor="#000000"
        android:text="This is sound view"
        />
</RelativeLayout>

public class DisplayFragment extends Fragment {
	public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
		View view = inflater.inflate(R.layout.display_fragment, container, false);
		return view;
	}
}

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#0000ff"
    android:orientation="vertical" >
    <TextView 
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:textSize="28sp"
        android:textColor="#000000"
        android:text="This is display view"
        />
</RelativeLayout>

public class SoundActivity extends Activity {
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.sound_activity);
	}
}

<?xml version="1.0" encoding="utf-8"?>
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/sound_fragment"
    android:name="com.example.fragmentdemo.SoundFragment"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >
</fragment>

public class DisplayActivity extends Activity {
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.display_activity);
	}
}

<?xml version="1.0" encoding="utf-8"?>
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/display_fragment"
    android:name="com.example.fragmentdemo.DisplayFragment"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >
</fragment>