Android原生”SlidingMenu”框架的代码简析

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<!--
As the main content view, the view below consumes the entire
space available using match_parent in both dimensions.
-->
<FrameLayout
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent" />

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<!--
The drawer is given a fixed width in dp and extends the full height of
the container.
-->
<fragment
android:id="@+id/navigation_drawer"
android:name="com.example.scsc.NavigationDrawerFragment"
android:layout_width="@dimen/navigation_drawer_width"
android:layout_height="match_parent"
android:layout_gravity="start" />

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ActionBar actionBar = getActionBar();
actionBar.setDisplayHomeAsUpEnabled(true);//是否显示Toggle开关图片
actionBar.setHomeButtonEnabled(false);//是否打开Toggle功能

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// set a custom shadow that overlays the main content when the drawer opens
mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START);

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@Override
public void onNavigationDrawerItemSelected(int position) {
// update the main content by replacing fragments
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager
.beginTransaction()//这里仅仅是做出，选项点击后替换相应的fragment界面"内容"
.replace(R.id.container,
PlaceholderFragment.newInstance(position + 1)).commit();
Toast.makeText(this, "第->" +(position + 1) +"<-被选中", Toast.LENGTH_SHORT).show();
}

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super.onCreate(savedInstanceState);

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@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putInt(STATE_SELECTED_POSITION, mCurrentSelectedPosition);//把当前选中的位置信息存储到state的某参数下
}

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 if (savedInstanceState != null) {//这里在OnCreate()中调用的
mCurrentSelectedPosition = savedInstanceState.getInt(STATE_SELECTED_POSITION);//取值和大家熟悉的Intent取值非常相似
mFromSavedInstanceState = true;
}

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@Override
public void onDetach() {
super.onDetach();
mCallbacks = null;
}