我实现了抽屉布局，当我单击导航视图项时，会打开选项卡布局。 tablayout很好，但问题是，当我单击选项卡布局的后退按钮时，应用程序崩溃，没有抽屉视图，重力为LEFT。另外我注意到当标签布局进入时导航抽屉关闭时有一点延迟，抽屉没有顺利关闭。
下面是我的java代码和xml：
public class Navigation extends AppCompatActivity implements
ItemFragment.OnHeadlineSelectedListener,
SortFragment.OnHeadlineSelectedListener{
private static final String TAG = Navigation.class.getSimpleName();
Toolbar toolbar;
FragmentManager mFragmentManager;
private TextView mCounter;
private ImageView cart;
FragmentTransaction mFragmentTransaction;
public int id, tabPosition = 0, tabPositionNavigation = 0;
private String drinkToSort = "empty";
SharedPreferences preferences;
private LocalStore localStore;
private String userName, email, location;
private String phone;
private DrawerLayout mDrawerLayout;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.navigation);
localStore = new LocalStore(this);
id = localStore.getLoggedInUser().getId();
userName = localStore.getLoggedInUser().getUserName();
email = localStore.getLoggedInUser().getEmail();
phone = localStore.getLoggedInUser().getPhone();
Log.i(TAG,"USERDATA" + "[" + id + userName + email + phone + location + "]");
relativeLayout = (RelativeLayout) findViewById(R.id.main_content);
preferences = PreferenceManager.getDefaultSharedPreferences(getBaseContext());
toolbar = (Toolbar) findViewById(R.id.toolbar);
if (toolbar != null) {
setSupportActionBar(toolbar);
}
getSupportActionBar().setDisplayShowHomeEnabled(true);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setHomeButtonEnabled(true);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerToggle = new ActionBarDrawerToggle(
this, /* host Activity */
mDrawerLayout, /* DrawerLayout object */
toolbar, /* 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) {
super.onDrawerClosed(view);
getActionBar().setTitle("hello");
}
/** Called when a drawer has settled in a completely open state. */
public void onDrawerOpened(View drawerView) {
super.onDrawerOpened(drawerView);
getActionBar().setTitle("hello");
}
};
Bundle extras = getIntent().getExtras();
if (extras != null) {
this.tabPosition = extras.getInt("tabPosition");
this.tabPositionNavigation = extras.getInt("tabPositionNavigation");
this.drinkToSort = extras.getString("drinkToSort");
Log.d(TAG, tabPosition + tabPositionNavigation + drinkToSort);
}
Bundle bundle = new Bundle();
bundle.putString("drinkToSort", drinkToSort);
LiquorFragment obj = new LiquorFragment();
obj.setArguments(bundle);
int width = getResources().getDisplayMetrics().widthPixels/2;
mFragmentManager = getSupportFragmentManager();
mFragmentTransaction = mFragmentManager.beginTransaction();
mFragmentTransaction.replace(R.id.frame_container, new NavigationFragment()).commit();
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.details_activity, menu);
RelativeLayout badgeLayout = (RelativeLayout) menu.findItem(R.id.cart_no).getActionView();
mCounter = (TextView) badgeLayout.findViewById(R.id.counter);
Log.d("sameSelectionCount", CartCounter.getCounter()+"");
mCounter.setText(""+CartCounter.getCounter());
cart = (ImageView) badgeLayout.findViewById(R.id.cart);
cart.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Log.d("cart_no","cart_no");
Intent intent = new Intent(getApplicationContext(), ShoppingList.class);
startActivity(intent);
}
});
return true;
}
@Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
}
else {
super.onBackPressed();
}
}
@Override
public void onStart() {
super.onStart();
// analytics
GoogleAnalytics.getInstance(this).reportActivityStart(this);
}
@Override
public void onResume() {
super.onResume();
//TabFragment.viewPager.setCurrentItem(1);
Log.d("landposzq",tabPositionNavigation + "");
if (tabPositionNavigation != 0){
if (tabPositionNavigation == 1){
NavigationFragment.viewPager.setCurrentItem(0);
} else if (tabPositionNavigation == 2){
NavigationFragment.viewPager.setCurrentItem(1);
} else if (tabPositionNavigation == 3){
NavigationFragment.viewPager.setCurrentItem(2);
} else if (tabPositionNavigation == 4){
NavigationFragment.viewPager.setCurrentItem(3);
} else if (tabPositionNavigation == 5){
NavigationFragment.viewPager.setCurrentItem(4);
}
}
}
}
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#ffffff"
tools:openDrawer="start"
android:fitsSystemWindows="true">
<!--Main content-->
<RelativeLayout
android:id="@+id/main_content"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/qb"
android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />
<FrameLayout
android:id="@+id/frame_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="@+id/toolbar" />
</RelativeLayout>
<!--Navigation Drawer-->
<android.support.design.widget.NavigationView
android:id="@+id/main_drawer"
android:layout_width="290dp"
android:layout_height="match_parent"
android:layout_gravity="start"
android:fitsSystemWindows="true"
android:background="@color/white"
app:headerLayout="@layout/drawer_header"
app:itemTextColor="#000000"
app:itemIconTint="@color/qb"
app:menu="@menu/menu_drawer" >
<LinearLayout
android:id="@+id/layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:orientation="vertical">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:layout_marginLeft="20dp"
android:src="@drawable/balloon4"
/>
<TextView
android:id="@+id/free_drinks"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#ffff99"
android:gravity="center_vertical"
android:padding="10dp"
android:drawableRight="@drawable/direction"
android:height="60dp"
android:textSize="18sp"
android:text="GET FREE DRINKS"
android:textColor="#000000"
android:layout_gravity="bottom"
/>
</LinearLayout>
</android.support.design.widget.NavigationView>
</android.support.v4.widget.DrawerLayout>
答案 0 :(得分：0)
更改你的onBackPressed（）方法如下：
@Override
public void onBackPressed() {
if (mDrawerLayout.isDrawerOpen(GravityCompat.START)) {
mDrawerLayout.closeDrawer(GravityCompat.START);
}
else {
super.onBackPressed();
}
}