我有一个CollapsingToolBarLayout。当导航抽屉关闭时，工具栏上的标题会消失。仅当工具栏处于折叠状态时才会发生这种情况。在Expanded状态下，标题仍然存在。我检查了代码但是我无法找到错误。 这是我的主要活动代码： -
import android.support.design.widget.CollapsingToolbarLayout;
import android.support.design.widget.CoordinatorLayout;
import android.support.v4.view.ViewPager;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBar;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import com.defcomm.invento.NavigationDrawerActivity;
import android.support.v4.widget.NestedScrollView;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
public class INVENTO extends AppCompatActivity {
private Toolbar toolbar;
private CoordinatorLayout mCoordinator;
private CollapsingToolbarLayout mCollapsableLayout;
private NestedScrollView nestedScrollView;
private ViewPager mPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_new);
mCoordinator= (CoordinatorLayout) findViewById(R.id.coordinator_layout);
mCollapsableLayout = (CollapsingToolbarLayout) findViewById(R.id.collapsing_toolbar);
toolbar= (Toolbar) findViewById(R.id.appbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayShowHomeEnabled(true);
mCollapsableLayout.setTitle(getResources().getString(R.string.app_name));
nestedScrollView= (NestedScrollView) findViewById(R.id.rvToDoList);
mCollapsableLayout.setExpandedTitleColor(getResources().getColor(R.color.textColor));
mCollapsableLayout.setCollapsedTitleTextColor(getResources().getColor(R.color.textColor));
NavigationDrawerActivity drawerFragment= (NavigationDrawerActivity) getSupportFragmentManager().
findFragmentById(R.id.navigation_drawer);
drawerFragment.setUp(R.id.navigation_drawer, (DrawerLayout) findViewById(R.id.drawerlayout), toolbar);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_invento, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
主要活动xml文件： -
<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/drawerlayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.defcomm.invento.INVENTO">
<android.support.design.widget.CoordinatorLayout
android:id="@+id/coordinator_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<android.support.design.widget.AppBarLayout
android:id="@+id/app_bar_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
>
<android.support.design.widget.CollapsingToolbarLayout
android:id="@+id/collapsing_toolbar"
android:layout_width="match_parent"
android:layout_height="200dp"
android:fitsSystemWindows="true"
android:background="#3f51b5"
app:contentScrim="@color/primaryColor"
app:expandedTitleMarginEnd="64dp"
app:expandedTitleMarginStart="48dp"
app:layout_scrollFlags="scroll|exitUntilCollapsed">
<ImageView
android:id="@+id/imageview"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="centerCrop"
android:src="@drawable/index"
app:layout_collapseMode="parallax" />
<android.support.v7.widget.Toolbar
android:id="@+id/appbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:layout_scrollFlags="scroll|enterAlways"
android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
app:layout_collapseMode="pin"/>
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<android.support.v4.widget.NestedScrollView
android:id="@+id/rvToDoList"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum. Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum."
android:textSize="26sp"
android:background="@android:color/white"
android:padding="5dp"
/>
</android.support.v4.widget.NestedScrollView>
<fragment
android:id="@+id/navigation_drawer"
android:name="com.defcomm.invento.NavigationDrawerActivity"
android:layout_width="@dimen/drawer_width"
android:layout_height="match_parent"
android:layout_gravity="start"
app:layout="@layout/fragment_navigation_drawer"
tools:layout="@layout/fragment_navigation_drawer" />
</android.support.design.widget.CoordinatorLayout>
</android.support.v4.widget.DrawerLayout>
}
我的导航java文件： -
import android.content.Context;
import android.content.SharedPreferences;
import android.content.res.Configuration;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.design.widget.CoordinatorLayout;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBar;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.view.LayoutInflater;
import android.support.design.widget.CollapsingToolbarLayout;
import android.view.View;
import android.view.ViewGroup;
public class NavigationDrawerActivity extends Fragment {
private ActionBarDrawerToggle mdrawerToggle;
private DrawerLayout mdrawerLayout;
private boolean mUserLearnedState;
private CoordinatorLayout mcoordinator;
private CollapsingToolbarLayout collapsingToolbarLayout;
View containerId;
public static final String file_pref_name = "Testpef";
public static final String KEY_USER_VALUE = "user_learned_drawer";
private boolean mfromSavedInstanceState;
public NavigationDrawerActivity() {
// Required empty public constructor
}
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mUserLearnedState = Boolean.valueOf(readPreference(getActivity(), KEY_USER_VALUE, "false"));
if (savedInstanceState != null) {
mfromSavedInstanceState = true;
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View layout=inflater.inflate(R.layout.fragment_navigation_drawer, container, false);
//recyclerview= (RecyclerView) layout.findViewById(R.id.recycler);
return layout;
}
public void setUp(final int fragmentId, DrawerLayout drawerlayout, final Toolbar toolbar) {
mdrawerLayout = drawerlayout;
containerId = getActivity().findViewById(fragmentId);
mdrawerToggle = new ActionBarDrawerToggle(getActivity(), drawerlayout, toolbar,
R.string.drawer_open, R.string.drawer_close) {
@Override
public void onDrawerOpened(View drawerView) {
super.onDrawerOpened(drawerView);
if (!mUserLearnedState) {
mUserLearnedState = true;
saveToPreference(getActivity(), KEY_USER_VALUE, mUserLearnedState + "");
}
getActivity().invalidateOptionsMenu();
toolbar.setTitle(getResources().getString(R.string.app_name));
}
@Override
public void onDrawerClosed(View drawerView) {
super.onDrawerClosed(drawerView);
getActivity().invalidateOptionsMenu();
toolbar.setTitle(getResources().getString(R.string.app_name));
}
@Override
public void onDrawerSlide(View drawerView, float slideOffset) {
if (slideOffset < 0.5f) {
toolbar.setAlpha(1 - slideOffset);
}
}
};
if (!mUserLearnedState && !mfromSavedInstanceState) {
mdrawerLayout.openDrawer(containerId);
}
mdrawerLayout.setDrawerListener(mdrawerToggle);
mdrawerLayout.post(new Runnable() {
@Override
public void run() {
mdrawerToggle.syncState();
}
});
}
public static void saveToPreference(Context context, String preferenceName, String preferenceValue) {
SharedPreferences shared = context.getSharedPreferences(file_pref_name, Context.MODE_PRIVATE);
SharedPreferences.Editor editor = shared.edit();
editor.putString(preferenceName, preferenceValue);
editor.apply();
}
public static String readPreference(Context context, String preferenceName, String defaultValue) {
SharedPreferences share = context.getSharedPreferences(file_pref_name, Context.MODE_PRIVATE);
return share.getString(preferenceName, defaultValue);
}
}
答案 0 :(得分：1)
我有类似的问题，发现有一个示例repo是为演示此问题here而创建的。如果该链接无效，请查看我的分叉版本here
经过一些随机实验后，我发现在AppBarLayout上设置删除android:fitsSystemWindows="true"（属性）可以解决这个问题。附上Fixed layout file和MainActivity供您参考。
而且，仅在setup上定义的NavigationDrawerActivity方法尝试在工具栏上设置标题，但根据官方指南，您需要在CollapsingToolBarLayout而不是工具栏上设置标题。
我建议您使用NavigationView（来自设计支持库）而不是自定义DrawerFragment，除非您想在导航抽屉中添加花哨/自定义行为。