androidUI抽屉效果菜单---代码

分类： Android2014-08-19
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androidUI抽屉效果

官网guide：http://developer.android.com/training/implementing-navigation/nav-drawer.html
官网示例：NavigationDrawer.zip

android.support.v4.widget.DrawerLayout 抽屉layout。该widget只能实现从左向右、从右向左
openDrawer(), closeDrawer(), isDrawerOpen()

示例图：(示例图中增加了左右菜单功能，下面的代码基本还是官方原版的)



下面贴一下示例的主要的布局文件 和 activity实现
activity_main.xml

[html] view
plaincopyprint?





<android.support.v4.widget.DrawerLayout

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

android:id="@+id/drawer_layout"

android:layout_width="match_parent"

android:layout_height="match_parent">

<FrameLayout

android:id="@+id/content_frame"

android:layout_width="match_parent"

android:layout_height="match_parent" />

<ListView

android:id="@+id/left_drawer"

android:layout_width="240dp"

android:layout_height="match_parent"

android:layout_gravity="right"

android:choiceMode="singleChoice"

android:divider="@android:color/transparent"

android:dividerHeight="0dp"

android:background="#111"/>

<!--

android:choiceMode 选中状态 跟itemclick没有冲突

none 值为0，表示无选择模式；

singleChoice 值为1，表示最多可以有一项被选中；

multipleChoice 值为2，表示可以多项被选中。

android:layout_gravity left或right left或start right或end

表示在抽屉里的效果是从左到右还是从右到左出现

-->

</android.support.v4.widget.DrawerLayout>

[java] view
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package com.stone.drawerlayout;

/*

* Copyright 2013 The Android Open Source Project

*

* Licensed under the Apache License, Version 2.0 (the "License");

* you may not use this file except in compliance with the License.

* You may obtain a copy of the License at

*

* http://www.apache.org/licenses/LICENSE-2.0
*

* Unless required by applicable law or agreed to in writing, software

* distributed under the License is distributed on an "AS IS" BASIS,

* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

* See the License for the specific language governing permissions and

* limitations under the License.

*/

import java.util.Locale;

import android.app.Activity;

import android.app.Fragment;

import android.app.FragmentManager;

import android.app.SearchManager;

import android.content.Intent;

import android.content.res.Configuration;

import android.os.Bundle;

import android.support.v4.app.ActionBarDrawerToggle;

import android.support.v4.view.GravityCompat;

import android.support.v4.widget.DrawerLayout;

import android.view.LayoutInflater;

import android.view.Menu;

import android.view.MenuInflater;

import android.view.MenuItem;

import android.view.View;

import android.view.ViewGroup;

import android.widget.AdapterView;

import android.widget.ArrayAdapter;

import android.widget.ImageView;

import android.widget.ListView;

import android.widget.Toast;

/**

* This example illustrates a common usage of the DrawerLayout widget

* in the Android support library.

* <p/>

* <p>When a navigation (left) drawer is present, the host activity should detect presses of

* the action bar's Up affordance as a signal to open and close the navigation drawer. The

* ActionBarDrawerToggle facilitates this behavior.

* Items within the drawer should fall into one of two categories:</p>

* <p/>

* <ul>

* <li><strong>View switches</strong>. A view switch follows the same basic policies as

* list or tab navigation in that a view switch does not create navigation history.

* This pattern should only be used at the root activity of a task, leaving some form

* of Up navigation active for activities further down the navigation hierarchy.</li>

* <li><strong>Selective Up</strong>. The drawer allows the user to choose an alternate

* parent for Up navigation. This allows a user to jump across an app's navigation

* hierarchy at will. The application should treat this as it treats Up navigation from

* a different task, replacing the current task stack using TaskStackBuilder or similar.

* This is the only form of navigation drawer that should be used outside of the root

* activity of a task.</li>

* </ul>

* <p/>

* <p>Right side drawers should be used for actions, not navigation. This follows the pattern

* established by the Action Bar that navigation should be to the left and actions to the right.

* An action should be an operation performed on the current contents of the window,

* for example enabling or disabling a data overlay on top of the current content.</p>

*/

public class MainActivity extends Activity {

private DrawerLayout mDrawerLayout;

private ListView mDrawerList;

private ActionBarDrawerToggle mDrawerToggle;

private CharSequence mDrawerTitle;

private CharSequence mTitle;

private String[] mPlanetTitles;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

mTitle = mDrawerTitle = getTitle();

mPlanetTitles = getResources().getStringArray(R.array.planets_array);

mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);

mDrawerList = (ListView) findViewById(R.id.left_drawer);//抽屉里的view

// set a custom shadow that overlays the main content when the drawer opens

mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START);//设置shadow

// set up the drawer's list view with items and click listener

mDrawerList.setAdapter(new ArrayAdapter<String>(this,

R.layout.drawer_list_item, mPlanetTitles));

mDrawerList.setOnItemClickListener(new DrawerItemClickListener());

// enable ActionBar app icon to behave as action to toggle nav drawer 需要api level 11

getActionBar().setDisplayHomeAsUpEnabled(true);//给home icon的左边加上一个返回的图标

getActionBar().setHomeButtonEnabled(true); //需要api level 14 使用home-icon 可点击

// ActionBarDrawerToggle ties together the the proper interactions

// between the sliding drawer and the action bar app icon

mDrawerToggle = new ActionBarDrawerToggle(//v4控件 actionbar上的抽屉开关

this, /* host Activity */

mDrawerLayout, /* DrawerLayout object */

R.drawable.ic_drawer, /* nav drawer image to replace 'Up' caret */ //上一级图标 返回图标

R.string.drawer_open, /* "open drawer" description for accessibility */

R.string.drawer_close /* "close drawer" description for accessibility */

) {

public void onDrawerClosed(View view) {//抽屉关闭后

getActionBar().setTitle(mDrawerTitle);

invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()

}

public void onDrawerOpened(View drawerView) {//抽屉打开后

getActionBar().setTitle(mTitle);

invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()

}

@Override

public boolean onOptionsItemSelected(MenuItem item) {

if (item != null && item.getItemId() == android.R.id.home) {//actionbar上的home icon

//END即gravity.right 从右向左显示 START即left 从左向右弹出显示

if (mDrawerLayout.isDrawerVisible(GravityCompat.END)) {

mDrawerLayout.closeDrawer(GravityCompat.END);//关闭抽屉

} else {

mDrawerLayout.openDrawer(GravityCompat.END);//打开抽屉

}

return true;

}

return false;

}

};

mDrawerLayout.setDrawerListener(mDrawerToggle);//设置抽屉监听

if (savedInstanceState == null) {

// selectItem(0);

}

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {//加载menu sdk3.0以后menu包含在actionbar中

MenuInflater inflater = getMenuInflater();

inflater.inflate(R.menu.main, menu);

return super.onCreateOptionsMenu(menu);

}

/* Called whenever we call invalidateOptionsMenu() */

@Override

public boolean onPrepareOptionsMenu(Menu menu) {

// If the nav drawer is open, hide action items related to the content view

boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);

menu.findItem(R.id.action_websearch).setVisible(!drawerOpen);//search的显示与drawer的显示相反

return super.onPrepareOptionsMenu(menu);

}

@Override

public boolean onOptionsItemSelected(MenuItem item) {

// The action bar home/up action should open or close the drawer.

// ActionBarDrawerToggle will take care of this.

if (mDrawerToggle.onOptionsItemSelected(item)) {

return true;

}

// Handle action buttons

switch(item.getItemId()) {

case R.id.action_websearch:

// create intent to perform web search for this planet

Intent intent = new Intent(Intent.ACTION_WEB_SEARCH);

intent.putExtra(SearchManager.QUERY, getActionBar().getTitle());

// catch event that there's no activity to handle intent

if (intent.resolveActivity(getPackageManager()) != null) {

startActivity(intent);

} else {

Toast.makeText(this, R.string.app_not_available, Toast.LENGTH_LONG).show();

}

return true;

default:

return super.onOptionsItemSelected(item);

}

}

/* The click listner for ListView in the navigation drawer */

private class DrawerItemClickListener implements ListView.OnItemClickListener {

@Override

public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

selectItem(position);

}

}

//内容区显示PlanetFragment

private void selectItem(int position) {

// update the main content by replacing fragments

Fragment fragment = new PlanetFragment();

Bundle args = new Bundle();

args.putInt(PlanetFragment.ARG_PLANET_NUMBER, position);

fragment.setArguments(args);

FragmentManager fragmentManager = getFragmentManager();

fragmentManager.beginTransaction().replace(R.id.content_frame, fragment).commit();

// update selected item and title, then close the drawer

// mDrawerList.setItemChecked(position, true);

// setTitle(mPlanetTitles[position]);

mDrawerLayout.closeDrawer(mDrawerList);

}

@Override

public void setTitle(CharSequence title) {

mDrawerTitle = title;

getActionBar().setTitle(mDrawerTitle);

}

/**

* When using the ActionBarDrawerToggle, you must call it during

* onPostCreate() and onConfigurationChanged()...

*/

@Override

protected void onPostCreate(Bundle savedInstanceState) {

super.onPostCreate(savedInstanceState);

// Sync the toggle state after onRestoreInstanceState has occurred.

mDrawerToggle.syncState();

}

@Override

public void onConfigurationChanged(Configuration newConfig) {

super.onConfigurationChanged(newConfig);

// Pass any configuration change to the drawer toggls

mDrawerToggle.onConfigurationChanged(newConfig);

}

/**

* Fragment that appears in the "content_frame", shows a planet

*/

public static class PlanetFragment extends Fragment {

public static final String ARG_PLANET_NUMBER = "planet_number";

public PlanetFragment() {

// Empty constructor required for fragment subclasses

}

@Override

public View onCreateView(LayoutInflater inflater, ViewGroup container,

Bundle savedInstanceState) {

View rootView = inflater.inflate(R.layout.fragment_planet, container, false);

int i = getArguments().getInt(ARG_PLANET_NUMBER);

String planet = getResources().getStringArray(R.array.planets_array)[i];

//查找出 res-drawable资源的id

int imageId = getResources().getIdentifier(planet.toLowerCase(Locale.getDefault()),

"drawable", getActivity().getPackageName());

((ImageView) rootView.findViewById(R.id.image)).setImageResource(imageId);

getActivity().setTitle(planet);

return rootView;

}

}

}

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