为什么这个android工具栏是空的？

Question

我有一个带工具栏的活动，但工具栏中没有后箭头和活动标签。我不确定为什么，因为我有另一个活动使用看似相同的代码，工具栏显示后面箭头和manifest.xml中设置的活动标签值。

<!--This is the activity where the toolbar doesn't work-->
<activity
        android:name=".CreateReviewActivity"
        android:label="@string/title_activity_create_review"
        android:parentActivityName=".VenuesToReviewActivity"
        android:theme="@style/Theme.Phield">
        <meta-data
            android:name="android.support.PARENT_ACTIVITY"
            android:value="com.tremulant.phield.MainActivity"/>
</activity>
<!--This activity's toolbar works-->
<activity
        android:name=".ReviewDetailsActivity"
        android:label="@string/title_activity_review_details"
        android:parentActivityName=".VenuesToReviewActivity"
        android:theme="@style/Theme.Phield">
        <meta-data
            android:name="android.support.PARENT_ACTIVITY"
            android:value="com.tremulant.phield.VenuesToReviewActivity"/>
</activity>

工具栏布局。

<android.support.v7.widget.Toolbar
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:flickr="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="?actionBarSize"
    flickr:theme="@style/ActionBarThemeOverlay"
    flickr:titleTextAppearance="@style/ActionBar.TitleText">
</android.support.v7.widget.Toolbar>

好的衡量标准

<string name="title_activity_create_review">Create Review</string>
<string name="title_activity_review_details">Review Details</string>

不起作用的布局

<ScrollView
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:phield="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/phieldBackgroundColor"
    tools:context=".CreateReviewActivity">

    <LinearLayout

        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        >

        <android.support.design.widget.AppBarLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:theme="@style/Theme.Phield.AppBarOverlay">

            <android.support.v7.widget.Toolbar
                android:id="@+id/toolbar"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                android:background="?attr/colorPrimary"
                phield:popupTheme="@style/Theme.Phield.PopupOverlay"/>

        </android.support.design.widget.AppBarLayout>


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

            <include
                android:id="@+id/app_bar"
                layout="@layout/toolbar"
                android:layout_width="match_parent"
                android:layout_height="?actionBarSize"/>

        </LinearLayout>


java activity class that isn't working 

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

<ScrollView
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:phield="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/phieldBackgroundColor"
    tools:context=".CreateReviewActivity">

    <LinearLayout

        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        >

        <android.support.design.widget.AppBarLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:theme="@style/Theme.Phield.AppBarOverlay">

            <android.support.v7.widget.Toolbar
                android:id="@+id/toolbar"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                android:background="?attr/colorPrimary"
                phield:popupTheme="@style/Theme.Phield.PopupOverlay"/>

        </android.support.design.widget.AppBarLayout>


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

            <include
                android:id="@+id/app_bar"
                layout="@layout/toolbar"
                android:layout_width="match_parent"
                android:layout_height="?actionBarSize"/>

        </LinearLayout>

没有工作的Java类

import android.content.ContentValues;
import android.content.Intent;
import android.graphics.Typeface;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.view.inputmethod.InputMethodManager;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.NumberPicker;
import android.widget.RatingBar;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;

import com.tremulant.phield.data.Review;
import com.tremulant.phield.data.User;
import com.tremulant.phield.data.Venue;
import com.tremulant.phield.data.helpers.StringWithTag;
import com.tremulant.phield.webservices.WebServiceTask;
import com.tremulant.phield.webservices.WebServiceUtils;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import static com.tremulant.phield.Constants.DEFAULT_REVIEW_TEXT;

public class CreateReviewActivity extends BaseActivity implements RatingBar.OnRatingBarChangeListener, View.OnClickListener, AdapterView.OnItemSelectedListener{
    private User mUser;
    private Venue mVenue;
    private Review mReview;
    private Button btnSubmit;
    private EditText mEditText;
    private TextView mUserTextCounter;
    private boolean mbEditTextFocusedOnce;
    private CreateReviewServiceTask mCreateReviewServiceTask;
    private static final String LOG_TAG = "CreateReviewActivity";
    //private RatingBar mRatingBar;
    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        checkUserTokensSet();
        setContentView(R.layout.activity_create_review);
        //activateToolbarWithHomeEnabled();

        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);

有效的活动布局。

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
    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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:context="com.tremulant.phield.ReviewDetailsActivity">

    <android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/Theme.Phield.AppBarOverlay">

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            app:popupTheme="@style/Theme.Phield.PopupOverlay"/>

    </android.support.design.widget.AppBarLayout>

    <LinearLayout android:layout_width="match_parent"
                  android:layout_height="match_parent"
                android:orientation="vertical"
    >
    <include
        android:id="@+id/app_bar"
        layout="@layout/toolbar"
        android:layout_width="match_parent"
        android:layout_height="?actionBarSize"/>

    <include layout="@layout/content_review_details"/>
    </LinearLayout>
</android.support.design.widget.CoordinatorLayout>

有效且与之相关的内容部分

<RelativeLayout
    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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:context="com.tremulant.phield.ReviewDetailsActivity"
    tools:showIn="@layout/activity_review_details">

有效的Java活动

import android.annotation.SuppressLint;
import android.content.ContentValues;
import android.content.Intent;
import android.graphics.Typeface;
import android.os.Build;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.View;
import android.view.ViewTreeObserver;
import android.widget.ListView;
import android.widget.TextView;

import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
import com.tremulant.phield.data.AggReview;
import com.tremulant.phield.data.User;
import com.tremulant.phield.webservices.WebServiceTask;
import com.tremulant.phield.webservices.WebServiceUtils;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

public class ReviewDetailsActivity extends BaseActivity implements View.OnClickListener, OnMapReadyCallback{

    private User mUser;
    private AggReview mAggReview;
    private ReviewTextAdapter mReviewTextAdapter;
    private GoogleMap mMap;
    private LatLng mLatLng;
    private RetrieveReviewTextTask mRetrieveReviewTextTask;
    private static final String LOG_TAG = "ReviewDetailsActivity";
    private List<ReviewText> mReviewTexts = new ArrayList<ReviewText>();

    @Override
    public void onClick(View v) {
        Intent mapIntent = new Intent(ReviewDetailsActivity.this, VenueMap.class);
        mapIntent.putExtra(VENUE_TRANSFER,mAggReview);
        startActivity(mapIntent);
    }

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

        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);

style.xml

<resources>

    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
    </style>

    <style name="Theme.Base" parent="AppTheme">
        <item name="colorPrimary">@color/phieldPrimaryColor</item>
        <item name="colorPrimaryDark">@color/phieldPrimaryDarkColor</item>
        <item name="colorAccent">@color/phieldAccentColor</item>
        <item name="windowActionBar">false</item>
        <item name="android:windowNoTitle">true</item>
        <item name="android:windowBackground">@color/phieldBackgroundColor</item>
        <item name="android:spinnerDropDownItemStyle">@style/mySpinnerItemStyle</item>
        <item name="android:spinnerItemStyle">@style/mySpinnerItemStyle</item>
    </style>

    <style name="Theme.Phield" parent="Theme.Base"/>

    <style name="ActionBarThemeOverlay" parent="">
        <item name="android:textColorPrimary">@color/phieldPrimaryTextColor</item>
        <item name="colorControlHighlight">@color/phieldAccentColor</item>
        <item name="android:actionMenuTextColor">@color/phieldBackgroundColor</item>
        <item name="android:textColorSecondary">@color/phieldBackgroundColor</item>
        <item name="android:background">@color/phieldPrimaryColor</item>

    </style>

    <style name="ActionBar.TitleText" parent="TextAppearance.AppCompat.Widget.ActionBar.Title">
        <item name="android:textColor">@color/phieldBackgroundColor</item>
        <item name="android:textSize">18sp</item>
    </style>

    <style name="Theme.Phield.AppBarOverlay" parent="ThemeOverlay.AppCompat.Dark.ActionBar"/>

    <style name="Theme.Phield.PopupOverlay" parent="ThemeOverlay.AppCompat.Light"/>

    <style name="FullscreenTheme" parent="Theme.Phield">
        <item name="android:actionBarStyle">@style/FullscreenActionBarStyle</item>
        <item name="android:windowActionBarOverlay">true</item>
        <item name="android:windowBackground">@null</item>
        <item name="metaButtonBarStyle">?android:attr/buttonBarStyle</item>
        <item name="metaButtonBarButtonStyle">?android:attr/buttonBarButtonStyle</item>
        <item name="colorPrimary">@color/md_black_1000</item>
        <item name="colorPrimaryDark">@color/md_black_1000</item>
    </style>

    <style name="FullscreenActionBarStyle" parent="Widget.AppCompat.ActionBar">
        <item name="android:background">@color/black_overlay</item>
    </style>

    <style name="mySpinnerItemStyle" parent="@android:style/Widget.Holo.DropDownItem.Spinner">
        <item name="android:textColor">@color/phieldPrimaryColor</item>
    </style>

    <style name="mySpinnerSelectedItemStyle"
           parent="@android:style/Widget.Holo.DropDownItem.Spinner">
        <item name="android:textColor">@color/phieldPrimaryColor</item>
    </style>



</resources>

我也尝试将我的activity_create_reviews拆分为具有Coordinator布局和内容布局的活动布局，但这也没有工作并且与我的格式混乱，所以我还原了它。这是为了展示我的尝试。

activity_create_reviews.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
    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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:context="com.tremulant.phield.CreateReviewActivity">

    <android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/Theme.Phield.AppBarOverlay">

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            app:popupTheme="@style/Theme.Phield.PopupOverlay"/>

    </android.support.design.widget.AppBarLayout>

    <LinearLayout android:layout_width="match_parent"
                  android:layout_height="match_parent"
                  android:orientation="vertical"
    >
    <include
        android:id="@+id/app_bar"
        layout="@layout/toolbar"
        android:layout_width="match_parent"
        android:layout_height="?actionBarSize"/>

        <include layout="@layout/content_create_review"/>
    </LinearLayout>
</android.support.design.widget.CoordinatorLayout>

content_create_reviews.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:context="com.tremulant.phield.CreateReviewActivity"
    tools:showIn="@layout/activity_create_review">

    <!--  <ScrollView

          android:layout_width="match_parent"
          android:layout_height="match_parent"
          android:background="@color/phieldBackgroundColor"
          >-->

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

        <LinearLayout
            android:id="@+id/my_linear_layout"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical"
            android:padding="8dp"
        >

            <TextView
                android:id="@+id/venue_name"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:textColor="@color/phieldPrimaryTextColor"
                android:textSize="14sp"/>
            <!--etc more layouts  and things unrelate to toolbar

Answer 1

我发现了我做错了什么。我的活动中有两次setContentView导致工具栏无法显示。

Answer 2

如果您需要使用工具栏，则应在noActionBar中为您的活动（或您的应用程序代码）设置manifest主题，例如：

<activity android:name=".MainActivity"
        android:theme="@style/Theme.AppCompat.DayNight.NoActionBar">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>

您还需要将工具栏设置为活动的操作栏，也可以设置onCreateOptionMenu以上的活动：

public class MainActivity extends AppCompatActivity { 


private Toolbar toolbar;                              // Declaring the Toolbar Object


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

    toolbar = (Toolbar) findViewById(R.id.tool_bar); // Attaching the layout to the toolbar object
    setSupportActionBar(toolbar);                   // Setting toolbar as the ActionBar with setSupportActionBar() call

}


@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_main, 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);
}
}