展会信息港展会大全

android开发之ActionBar实现下拉式导航(下拉菜单)
来源:互联网   发布日期:2015-09-29 10:49:50   浏览:2748次  

导读:利用Actionbar同样可以很轻松的实现下拉式的导航方式,相比与tab的方式下拉式的导航方式更类型于html中 的select标签。若想实现这种效 果:1)actionBar setNavigationMode(ActionBar NAVIGATION_MODE_LIST) ...

利用Actionbar同样可以很轻松的实现下拉式的导航方式,相比与tab的方式下拉式的导航方式更类型于html中 的<select>标签。若想实现这种效 果:1)actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_LIST)2)setListNavigationCallbacks(SpinnerAdapter adapter,ActionBar.OnNavigationListener callback).

首先是创建一个Fragment类:

package ccom.app.main;

import android.annotation.SuppressLint;

import android.app.Fragment;

import android.content.Context;

import android.os.Bundle;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.view.ViewGroup.LayoutParams;

import android.widget.TextView;

@SuppressLint("NewApi")

public class MyFragment extends Fragment {

@Override

public View onCreateView(LayoutInflater inflater, ViewGroup container,

Bundle savedInstanceState) {

Context context = this.getActivity();

TextView tv = new TextView(context);

Bundle arc = this.getArguments();

int tabs=arc.getInt("key");

tv.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT,

LayoutParams.WRAP_CONTENT));

tv.setText("hello actionbar "+tabs);

return tv;

}

}

main.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=".Main" >

<LinearLayout

android:id="@+id/content"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical" />

</RelativeLayout>

自定义的用于显示textview的mytextview.xml:

<?xml version="1.0" encoding="utf-8"?>

<TextView xmlns:android="http://schemas.android.com/apk/res/android"

android:id="@+id/text1"

android:textColor="#fff"

android:background="#696969"

android:layout_width="60sp"

android:layout_height="match_parent"

android:textAppearance="?android:attr/textAppearanceListItemSmall"

android:gravity="center_vertical"

android:paddingStart="?android:attr/listPreferredItemPaddingStart"

android:minHeight="?android:attr/listPreferredItemHeightSmall"

/>

Main.java

package ccom.app.main;

import android.annotation.SuppressLint;

import android.app.ActionBar;

import android.app.Activity;

import android.app.FragmentTransaction;

import android.os.Bundle;

import android.widget.ArrayAdapter;

@SuppressLint("NewApi")

public class Main extends Activity implements ActionBar.OnNavigationListener {

ActionBar actionBar = null;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

actionBar = this.getActionBar();

actionBar.setDisplayShowTitleEnabled(true);

actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_LIST);

actionBar.setListNavigationCallbacks(new ArrayAdapter(Main.this,

R.layout.mytextview, R.id.text1, new String[] { "tab1", "tab2",

"tab3" }), this);

}

@Override

public boolean onNavigationItemSelected(int itemPosition, long itemId) {

MyFragment mf = new MyFragment();

Bundle bundle = new Bundle();

bundle.putInt("key", itemPosition + 1);

mf.setArguments(bundle);

FragmentTransaction action = this.getFragmentManager()

.beginTransaction();

action.replace(R.id.content, mf);

action.commit();

return true;

}

}

实现的效果如图:

赞助本站

人工智能实验室

相关热词: ActionBar 下拉菜单 android

AiLab云推荐
展开

热门栏目HotCates

Copyright © 2010-2024 AiLab Team. 人工智能实验室 版权所有    关于我们 | 联系我们 | 广告服务 | 公司动态 | 免责声明 | 隐私条款 | 工作机会 | 展会港