一.显示ActionBar
1.定义V7包下的ActionBar
android.support.v7.app.ActionBar actionBar;
2.获取ActionBar
actionBar = getSupportActionBar();
3.显示ActionBar动作栏
actionBar.show();
import android.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class MainActivity extends AppCompatActivity {
Button action_show, action_hide; //定义显示与隐藏按钮
android.support.v7.app.ActionBar actionBar; //定义V7包下的ActionBar
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
actionBar = getSupportActionBar(); //获取ActionBar动作栏
action_show = (Button) findViewById(R.id.actionBar_show); //获取显示按钮
action_hide = (Button) findViewById(R.id.actionBar_hide); //获取隐藏按钮
action_show.setOnClickListener(l); //为显示按钮设置监听事件
action_hide.setOnClickListener(l); //为隐藏按钮设置监听事件
}
View.OnClickListener l = new View.OnClickListener() { //创建一个新的监听事件l
@Override
public void onClick(View v) {
switch (v.getId()) { //根据选择按钮的id判断
case R.id.actionBar_show:
actionBar.show(); //显示ActionBar动作栏
break;
case R.id.actionBar_hide:
actionBar.hide(); //隐藏ActionBar动作栏
break;
}
}
};
}
二.ActionItem
添加一个ActionItem需要以下步骤:
1.编写menu.xml
<?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">
<item
android:id="@+id/search"
android:icon="@drawable/search"
android:title="@string/search"
app:showAsAction="always"></item>
<item
android:id="@+id/bell"
android:icon="@drawable/bell"
android:title="@string/bell"
app:showAsAction="always"></item>
<item
android:id="@+id/settings"
android:title="@string/settings"
app:showAsAction="ifRoom"></item>
<item
android:id="@+id/about"
android:title="@string/about"
app:showAsAction="never"></item>
</menu>
2.在onCreateOptionsMenu(Menu menu)方法内实例化一个MenuInflater对象并解析菜单文件
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater=getMenuInflater(); //实例化一个MenuInflater对象
inflater.inflate(R.menu.menu,menu); //解析菜单文件
return super.onCreateOptionsMenu(menu);
}
}
三.添加action_view
1.编写menu.xml
<?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">
<item
android:id="@+id/search"
android:title="@string/search"
app:actionViewClass="android.support.v7.widget.SearchView"
app:showAsAction="always"
></item>
<item
android:id="@+id/img1"
android:title="@string/img1"
app:actionLayout="@layout/img_message"
app:showAsAction="always"></item>
<item
android:id="@+id/img2"
android:title="@string/img2"
app:actionLayout="@layout/img_add"
app:showAsAction="always"></item>
</menu>
2.编写各个view
img_add.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="14dp"
android:src="@drawable/add" />
</LinearLayout>
3.在onCreateOptionsMenu(Menu menu)方法内实例化一个MenuInflater对象并解析菜单文件
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//隐藏ActionBar中显示的标题
getSupportActionBar().setDisplayShowTitleEnabled(false);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater(); //实例化一个MenuInflater对象
inflater.inflate(R.menu.menu, menu); //解析菜单文件
return super.onCreateOptionsMenu(menu);
}
}
四.ActionBar中的tab
1.使用setTabListener()方法添加并监听标签
actionBar.addTab(actionBar.newTab().setText("词典").
setTabListener(new MyTabListener(this, Fragment1.class)));
2.在MyTabListener方法中编写标签页变化代码
import android.app.Activity;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.ActionBar;
/**
* Created by Administrator on 2016/5/16.
*/
public class MyTabListener implements ActionBar.TabListener {
private Fragment fragment; //定义Fragment
private final Activity activity; //定义Activity
private final Class aClass; //定义Class
public MyTabListener(Activity activity, Class aClass) { //添加构造函数
this.activity = activity;
this.aClass = aClass;
}
@Override
public void onTabSelected(ActionBar.Tab tab, FragmentTransaction ft) {
//判断碎片是否初始化
if (fragment == null) { //如果没有初始化,将其初始化
fragment = Fragment.instantiate(activity, aClass.getName());
ft.add(android.R.id.content, fragment, null);
}
ft.attach(fragment); //显示新画面
}
@Override
public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction ft) {
if (fragment != null) {
ft.detach(fragment); //删除旧画面
}
}
@Override
public void onTabReselected(ActionBar.Tab tab, FragmentTransaction ft) {
}
}
3.需要编写每一个标签的java和xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="fitXY"
android:src="@drawable/fragment_1"
/>
</LinearLayout>
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class Fragment1 extends Fragment {
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_1,null); //加载布局页面
}
}
五.层级导航
1.编写两个Activity,其中子级Activity需要有返回符号
if (NavUtils.getParentActivityName(FriendsActivity.this) != null) {
getSupportActionBar().setDisplayHomeAsUpEnabled(true); //显示向左的箭头图标
}
然后在AndroidManifest中将子级Activity注册父级Activity
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value=".MainActivity" />