Navigation drawer 和 Up Carat在fragments中的转换

问题：在使用抽屉的情况下，往下层fragment导航，其中某一个下层的fragment需要网上导航，即在这个fragment中，按压logo不希望出现抽屉而是希望出现向上导航。

When using the Navigation Drawer the Android devs are recommending that in the ActionBar "only those screens that are represented in the Navigation Drawer should actually have the Navigation Drawer image" and that "all other screens have the traditional up carat."

解决：

private ActionBarDrawerToggle mDrawerToggle;

mDrawerToggle = new ActionBarDrawerToggle(this, /* host Activity */
		mDrawerLayout, /* DrawerLayout object */
		R.drawable.ic_drawer, /* nav drawer icon to replace ‘Up‘ caret */
		R.string.drawer_open, /* "open drawer" description */
		R.string.drawer_close /* "close drawer" description */
		) {

			/** Called when a drawer has settled in a completely closed state. */
			public void onDrawerClosed(View view) {

				Log.e(TAG, "onDrawerClosed");

				super.onDrawerClosed(view);

				if (currentDrawerPosition == 0) // 不同的界面显示不同的title
					actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

				getActionBar().setTitle(mTitle);

				invalidateOptionsMenu(); // creates call to
											// onPrepareOptionsMenu()
			}

			/** Called when a drawer has settled in a completely open state. */
			public void onDrawerOpened(View drawerView) {

				Log.e(TAG, "onDrawerOpened");

				super.onDrawerOpened(drawerView);
				/**
				 * 打开的时候去掉 tabs,因为在drawer navigation不能overlay tabs
				 */
				actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);

				getActionBar().setTitle(mDrawerTitle);
				invalidateOptionsMenu(); // creates call to
											// onPrepareOptionsMenu()
			}
		};

		//disable the toggle menu and show up carat
		mDrawerToggle.setDrawerIndicatorEnabled(false);

MainActivity

This activity controls all fragments in the app.

When preparing new fragments to replace others, I set the DrawerTogglesetDrawerIndicatorEnabled(false) like this:

LowerLevelFragment lowFrag = new LowerLevelFragment();

//disable the toggle menu and show up carat
theDrawerToggle.setDrawerIndicatorEnabled(false);
  getSupportFragmentManager().beginTransaction().replace(R.id.frag_layout,   
  lowFrag).addToBackStack(null).commit();

@Override
public void onBackPressed() {
super.onBackPressed();

//turn on the Navigation Drawer image; this is called in the LowerLevelFragments
setDrawerIndicatorEnabled(true)

}

In the LowerLevelFragments

In the fragments I modified onCreate and onOptionsItemSelected like this:

In onCreate added setHasOptionsMenu(true) to enable configuring the options menu. Also setsetDisplayHomeAsUpEnabled(true) to enable the < in the actionbar:

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//needed to indicate that the fragment would like to add items to the Options Menu      
setHasOptionsMenu(true);

//update the actionbar to show the up carat/affordance 
getActivity().getActionBar().setDisplayHomeAsUpEnabled(true);
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {

// Get item selected and deal with it
switch (item.getItemId()) {
case android.R.id.home:

//called when the up affordance/carat in actionbar is pressed
getActivity().onBackPressed();
return true;
… 
}

但是当点击低层fragment的向上导航按钮时，不会指向之前的界面，如何回到上一个fragment:

因为上一个fragment是在某个tab中，且低层的这个fragment是没有tabs于是在低层的fragment中

		actionbar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);  

ActionBarActivity activity2 = (ActionBarActivity) getActivity();
		actionBar = activity2.getSupportActionBar();
		actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
		

Navigation drawer 和 Up Carat在fragments中的转换,布布扣,bubuko.com

Navigation drawer 和 Up Carat在fragments中的转换

原文：http://blog.csdn.net/zqx198810/article/details/21009037