styles.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
<item name="colorPrimary">@color/WhiteSmoke</item><!--浅灰白,title栏背景色-->
<item name="colorPrimaryDark">@color/black</item>
</style>
</resources>
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.myapplication">
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme"><!--修改theme-->
<activity
android:name=".MainActivity"
android:exported="true">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<androidx.appcompat.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?attr/colorPrimary"
><!--title栏背景色:灰白色-->
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="标题"
android:textSize="20sp"
android:textColor="@color/black"
android:layout_gravity="center"/>
</androidx.appcompat.widget.Toolbar>
</FrameLayout>
MainActivity.java
public class MainActivity extends AppCompatActivity {
private Toolbar toolbar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
toolbar = (Toolbar) findViewById(R.id.toolbar);
//设置导航图标要在setSupportActionBar方法之后
setSupportActionBar(toolbar);
toolbar.setNavigationIcon(R.drawable.baseline_arrow_back_ios_black_24dp);
}
@Override
public void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
//Toolbar 必须在onCreate()之后设置标题文本,否则默认标签将覆盖我们的设置
if (toolbar != null) {//mActionBarToolbar就是android.support.v7.widget.Toolbar
toolbar.setTitle("");//设置为空,可以自己定义一个居中的控件,当做标题控件使用
}
}
}
color.xml