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");
}
}
}
答案 0 :(得分:0)
if (toolbar != null)
,它始终必须为空。id
设置为包含布局<include layout="@layout/toolbar"/>
。你可以致电R.id.toolbar
。LinearLayout
而不是RelativeLayout
。AppCompatActivity