我是第一次使用Android Studio,无法ActionBar
在运行该应用程序时进行演出。这是我到目前为止的内容:
我的活动MainActivity.java
package xeniasis.mymarket;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.support.v7.app.ActionBar;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return super.onCreateOptionsMenu(menu);
}
}
它是布局activity_main.xml(那里什么都没有)
<?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: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"
tools:context="xeniasis.mymarket.MainActivity"></RelativeLayout>
和带有一项activity_main.xml的菜单
<?xml version="1.0" encoding="utf-8"?>
<menu 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"
tools:context="xeniasis.mymarket.MainActivity">
<item
android:id="@+id/action_update"
android:icon="@drawable/ic_action_update"
android:showAsAction="ifRoom"
android:title="@string/update_app" />
</menu>
我需要其他东西才能显示ActionBar
吗?
编辑
这是应用程序主题
<style name="AppTheme" parent="Base.Theme.AppCompat.Light.DarkActionBar">
<!-- Customize your theme here. -->
<item name="colorPrimary">@color/colorPrimary</item>
<item name="colorPrimaryDark">@color/colorPrimaryDark</item>
<item name="colorAccent">@color/colorAccent</item>
</style>
使用
AppCompatActivity
与ToolBar
按材料设计。
public class MyActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my);
// Find the toolbar view inside the activity layout
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
// Sets the Toolbar to act as the ActionBar for this Activity window.
// Make sure the toolbar exists in the activity and is not null
setSupportActionBar(toolbar);
}
// Menu icons are inflated just as they were with actionbar
@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;
}
}
activity_my.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
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:layout_width="match_parent"
android:layout_height="wrap_content"
app:titleTextColor="@android:color/white"
android:background="?attr/colorPrimary">
</android.support.v7.widget.Toolbar>
<!-- Layout for content is here. This can be a RelativeLayout -->
</LinearLayout>
将此添加到中
Style.xml
。
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
<!-- Customize your theme here. -->
<item name="colorPrimary">@color/colorPrimary</item>
<item name="colorPrimaryDark">@color/colorPrimaryDark</item>
<item name="colorAccent">@color/colorAccent</item>
</style>
<style name="ToolbarTheme" parent="@style/ThemeOverlay.AppCompat.Dark.ActionBar">
<!-- This would set the toolbar's background color -->
<item name="android:background">@color/colorPrimary</item>
<!-- android:textColorPrimary is the color of the title text in the Toolbar -->
<item name="android:textColorPrimary">@android:color/holo_blue_light</item>
<!-- android:actionMenuTextColor is the color of the text of action (menu) items -->
<item name="actionMenuTextColor">@android:color/holo_green_light</item>
<!-- Enable these below if you want clicking icons to trigger a ripple effect -->
<!--
<item name="selectableItemBackground">?android:selectableItemBackground</item>
<item name="selectableItemBackgroundBorderless">?android:selectableItemBackground</item>
-->
</style>
<!-- This configures the styles for the title within the Toolbar -->
<style name="Toolbar.TitleText" parent="TextAppearance.Widget.AppCompat.Toolbar.Title">
<item name="android:textSize">21sp</item>
<item name="android:textStyle">italic</item>
</style>
menu.xml
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<item
android:id="@+id/miCompose"
android:icon="@drawable/ic_compose"
app:showAsAction="ifRoom"
android:title="Compose">
</item>
<item
android:id="@+id/miProfile"
android:icon="@drawable/ic_profile"
app:showAsAction="ifRoom|withText"
android:title="Profile">
</item>
</menu>
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