工具栏不显示

Question

我正在尝试实现 Android 工具栏。现在，当我打开我的应用程序时，它看起来像这样：

上面的选项卡不是来自工具栏。它是 android 的旧版标签...我正在更新....

到目前为止，action bar 没有出现是正确的，但是toolbar 也没有出现。这是我的代码：

MainDrawer2:

public class MainDrawer2 extends ActionBarActivity
{
    private static final String EXTRA_NAV_ITEM    = "extraNavItem";
    private static final String STATE_CURRENT_NAV = "stateCurrentNav";

    private ActionBarDrawerToggle mDrawerToggle;
    private DrawerLayout mDrawerLayout;


    private NavDrawerListAdapter mDrawerAdapter;
    private ListView mDrawerList;

    private CharSequence mTitle;
    private CharSequence mDrawerTitle;

    private MainNavItem mCurrentNavItem;


    public static Intent createLaunchFragmentIntent(Context context, MainNavItem navItem)
    {
        return new Intent(context, MainDrawer2.class)
                .putExtra(EXTRA_NAV_ITEM, navItem.ordinal());
    }



    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fragment_main);

        //Crashlytics.start(this);



        mTitle = mDrawerTitle = getTitle();
        mDrawerLayout = (DrawerLayout)findViewById(R.id.drawer_layout);
        mDrawerList   = (ListView)findViewById(R.id.drawer);

        // Set a toolbar to replace the action bar.
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        //getActionBar().setDisplayHomeAsUpEnabled(true);
        //enableHomeButtonIfRequired();

        mDrawerAdapter = new NavDrawerListAdapter(getApplicationContext());
        mDrawerList.setAdapter(mDrawerAdapter);
        mDrawerList.setOnItemClickListener(new ListView.OnItemClickListener()
        {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id)
            {
                displayNavFragment((MainNavItem)parent.getItemAtPosition(position));
            }
        });

        mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout,
                R.drawable.ic_drawer, R.string.app_name, R.string.app_name)
        {
            public void onDrawerClosed(View view)
            {
                //getActionBar().setTitle(mTitle);
                invalidateOptionsMenu();
            }

            public void onDrawerOpened(View drawerView)
            {
                //getActionBar().setTitle(mDrawerTitle);
                invalidateOptionsMenu();
            }
        };

        mDrawerLayout.setDrawerListener(mDrawerToggle);

        if(getIntent().hasExtra(EXTRA_NAV_ITEM)){
            MainNavItem navItem = MainNavItem.values()
                    [getIntent().getIntExtra(EXTRA_NAV_ITEM,
                    MainNavItem.STATISTICS.ordinal())];
            displayNavFragment(navItem);
        }
        else if(savedInstanceState != null){
            mCurrentNavItem = MainNavItem.values()
                    [savedInstanceState.getInt(STATE_CURRENT_NAV)];
            setCurrentNavItem(mCurrentNavItem);
        }
        else{
            displayNavFragment(MainNavItem.STATISTICS);
        }
    }

    @TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH)
    private void enableHomeButtonIfRequired()
    {
        if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH){
            //getActionBar().setHomeButtonEnabled(true);
        }
    }
    public void setActionBarTitle(String title) {
        getActionBar().setTitle(title);
    }


    @Override
    public void setTitle(CharSequence title)
    {
        mTitle = title;
        //getActionBar().setTitle(mTitle);
    }

    @Override
    protected void onPostCreate(Bundle savedInstanceState)
    {
        super.onPostCreate(savedInstanceState);
        // Sync the toggle state after onRestoreInstanceState has occurred.
        mDrawerToggle.syncState();
    }

    @Override
    public void onConfigurationChanged(Configuration newConfig)
    {
        super.onConfigurationChanged(newConfig);
        // Pass any configuration change to the drawer toggles
        mDrawerToggle.onConfigurationChanged(newConfig);
    }

    @Override
    protected void onSaveInstanceState(Bundle outState)
    {
        super.onSaveInstanceState(outState);

        if (mCurrentNavItem == null){


        }
        else{
            outState.putInt(STATE_CURRENT_NAV, mCurrentNavItem.ordinal());
        }

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu)
    {
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    /*
    @Override
    public boolean onPrepareOptionsMenu(Menu menu)
    {
        // if nav drawer is opened, hide the action items
        boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);
        menu.findItem(R.id.action_settings).setVisible(!drawerOpen);
        return super.onPrepareOptionsMenu(menu);
    }
    */



    private void displayNavFragment(MainNavItem navItem)
    {
        //if(navItem == mCurrentNavItem){
        //  return;
        //}
        Fragment fragment = Fragment.instantiate(this,
                navItem.getFragClass().getName());
        if(fragment != null){

            getSupportFragmentManager().beginTransaction()
                    .replace(R.id.main, fragment)
                    .commit();
            //setCurrentNavItem(navItem);
        }
    }

    private void setCurrentNavItem(MainNavItem navItem)
    {
        int position = navItem.ordinal();
        // If navItem is in DrawerAdapter
        if(position >= 0 && position < mDrawerAdapter.getCount()){
            //mDrawerList.setItemChecked(position, true);
        }
        else{
            // navItem not in DrawerAdapter, de-select current item
            if(mCurrentNavItem != null){
                //mDrawerList.setItemChecked(mCurrentNavItem.ordinal(), false);
            }
        }

        //test to keep item not selected
        int toClear=mDrawerList.getCheckedItemPosition();

        if (toClear >= 0) {
            mDrawerList.setItemChecked(toClear, false);
        }

        mDrawerLayout.closeDrawer(mDrawerList);
        //setTitle(navItem.getTitleResId());
        mCurrentNavItem = navItem;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case android.R.id.home:
                if(mDrawerLayout.isDrawerOpen(mDrawerList)) {
                    mDrawerLayout.closeDrawer(mDrawerList);
                }
                else {
                    mDrawerLayout.openDrawer(mDrawerList);
                }
                return true;
            default:
                return super.onOptionsItemSelected(item);
        }
    }




    public void goToSearch(MenuItem item){

        //go to search page
        Fragment Fragment_one;
        FragmentManager man= getSupportFragmentManager();
        FragmentTransaction tran = man.beginTransaction();
        Fragment_one = new Search();

        tran.replace(R.id.main, Fragment_one);//tran.
        tran.addToBackStack(null);
        tran.commit();

    }

    public void scanBarcode(MenuItem item){

        //open scanner
        IntentIntegrator scanIntegrator = new IntentIntegrator(this);
        scanIntegrator.initiateScan();



    }

    public void onActivityResult(int requestCode, int resultCode, Intent intent) {

        //retrieve scan result
        IntentResult scanningResult = IntentIntegrator.parseActivityResult(requestCode, resultCode, intent);
        if (scanningResult != null) {
            //we have a result

            String scanContent = scanningResult.getContents();

            //todo: set scan content into setting, load new fragment which calls async task below. New
            //todo: fragment will have same ui as search. :-)
            Fragment Fragment_one;




            FragmentManager man= this.getSupportFragmentManager();
            FragmentTransaction tran = man.beginTransaction();
            BarcodeFrag fragmentNew = new BarcodeFrag();
            Bundle bundle = new Bundle();
            bundle.putString("scanContent", scanContent);
            fragmentNew.setArguments(bundle);


            tran.replace(R.id.main, fragmentNew);//tran.
            tran.addToBackStack(null);
            //tran.commit();
            tran.commitAllowingStateLoss();


        }

        else{
            Toast toast = Toast.makeText(getApplicationContext(),
                    "No scan data received!", Toast.LENGTH_SHORT);
            toast.show();
        }

    }



}

我的fragment_mail.xml：

<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >

    <FrameLayout
        android:id="@+id/main"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:minHeight="?attr/actionBarSize"
            android:background="#2196F3"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">
        </android.support.v7.widget.Toolbar>



    </FrameLayout>

    <ListView
        android:id="@+id/drawer"
        android:layout_width="240dp"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:divider="@android:color/white"
        android:background="@android:color/black"
        android:choiceMode="none"/>

</android.support.v4.widget.DrawerLayout>

我在 android studio 中也遇到了这个错误，这可能是相关的：

Answer 1

当你打电话时

getSupportFragmentManager().beginTransaction()
                .replace(R.id.main, fragment)
                .commit();

您正在用片段替换 @id/main 中的所有内容 - 包括您的工具栏。相反，您的布局应该在您放置片段的工具栏下方有一个单独的 FrameLayout：

<android.support.v4.widget.DrawerLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical" >

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:minHeight="?attr/actionBarSize"
            android:background="#2196F3"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">
        </android.support.v7.widget.Toolbar>

        <FrameLayout
            android:id="@+id/main"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1" />

    </LinearLayout>

    <ListView
        android:id="@+id/drawer"
        android:layout_width="240dp"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:divider="@android:color/white"
        android:background="@android:color/black"
        android:choiceMode="none"/>

</android.support.v4.widget.DrawerLayout>

Answer 2

创建 toolbar.xml

<android.support.v7.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/activity_my_toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/PrimaryColor"
app:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
app:popupTheme="@style/ThemeOverlay.AppCompat.Light"/>

现在将此工具栏包含在您的布局文件中，如下所示

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/view"
android:layout_width="match_parent"
android:layout_height="match_parent">


<include
    android:id="@+id/tool_bar"
    layout="@layout/toolbar"></include>

     <android.support.v4.widget.DrawerLayout

        // Write your other code here
          ....
     </android.support.v4.widget.DrawerLayout>

</RelativeLayout>

终于在MainDrawer2.java

 toolbar = (Toolbar) findViewById(R.id.tool_bar);   
 setSupportActionBar(toolbar);

Answer 3

只需将您的工具栏视图从片段框架布局中移出即可。也许您的工具栏上悬停着片段容器，而您没有看到它。在您的代码中看到的一些小东西是您使用方法

public void setActionBarTitle(String title) {
    getActionBar().setTitle(title);
}

当您使用工具栏时，您应该忘记 getActionBar() ，但您应该使用 getSupportActionBar()。

工具栏不显示

toolbar not showing up

android

android-layout

android-actionbar

android-toolbar