Android App Compact Libary ToolBar不显示活动标题

时间:2015-09-05 09:52:03

标签: android android-studio

我已经浏览了这里的所有帖子和建议的解决方案,但没有任何对我有用。我已经花了2天时间,即将放弃Android。所以我在这里寻求你们的帮助,你们建议的任何帮助都非常感谢。这是我的代码,如果我遗失任何内容,请告诉我。

的build.gradle

    dependencies {
        compile fileTree(dir: 'libs', include: ['*.jar'])
        compile 'com.android.support:appcompat-v7:21.0.3'
    }

toolbar.xml

    <?xml version="1.0" encoding="utf-8"?>
    <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/toolbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/colorPrimary"
        app:titleTextAppearance="@android:color/black"
        android:minHeight="?attr/actionBarSize" />

styles.xml

 <resources>

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

            <item name="colorPrimary">@color/colorPrimary</item>

            <!-- Customize your theme here. -->
        </style>

    </resources>

colors.xml

    <?xml version="1.0" encoding="utf-8"?>
    <resources>
        <color name="colorPrimary">#E64A19</color>

    </resources>

activity_maim.xml

 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
        android:layout_height="match_parent"  tools:context=".MainActivity">
        <include
            android:id="@+id/tool_bar"
            layout="@layout/toolbar"

            />
        <TextView android:text="@string/hello_world" android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:layout_alignParentEnd="true"
            android:layout_below="@+id/tool_bar"
            android:layout_alignParentLeft="true"
            android:layout_alignParentStart="true" />``

    </RelativeLayout>

清单文件

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.toolbarexample" >

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme"
        >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

</manifest>

MainActivity.java

package com.example.toolbarexample;

import android.app.Activity;
import android.os.Bundle;
import android.support.v7.app.ActionBar;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Toast;


public class MainActivity extends ActionBarActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);

        if (toolbar != null) {
            setSupportActionBar(toolbar);
            getSupportActionBar().setDisplayShowHomeEnabled(true);

            ActionBar actionBar = getSupportActionBar();
            actionBar.setTitle("Groups history");
             //also tested using
            //this.setTitle("My ToolBar");
           // toolbar.setTitle("My ToolBar");


        }

    }



}

1 个答案:

答案 0 :(得分:0)

  1. 您无需检查if (toolbar != null),它始终必须为空。
  2. 您无需将id设置为包含布局<include layout="@layout/toolbar"/>。你可以致电R.id.toolbar
  3. 您最好在活动布局中使用垂直方向LinearLayout而不是RelativeLayout
  4. 您最好扩展AppCompatActivity