android 应用架构随笔五（ActionBar与侧滑菜单DrawerLayout）

ActionBar（V7）的添加非常简单，只需要在AndroidManifest.xml中指定Application或Activity的theme是Theme.Holo或其子类就可以了，在Android 3.0及更高的版本中，Activity中都默认包含有ActionBar组件。

drawerLayout（V4）是Support Library包中实现了侧滑菜单效果的控件，可以说drawerLayout是因为第三方控件如MenuDrawer等的出现之后，google借鉴而出现的产物。drawerLayout分为侧边菜单和主内容区两部分，侧边菜单可以根据手势展开与隐藏（drawerLayout自身特性），主内容区的内容可以随着菜单的点击而变化（这需要使用者自己实现）。

<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
                                        android:id="@+id/drawer_layout"
                                        xmlns:tools="http://schemas.android.com/tools"
                                        android:layout_width="match_parent"
                                        android:layout_height="match_parent">

    <RelativeLayout
            android:id="@+id/content_frame"
            android:layout_width="match_parent"
            android:layout_height="match_parent">

        <com.heima.googleplay.widget.PagerTab
                android:id="@+id/tabs"
                android:layout_width="match_parent"
                android:layout_height="42dip"
                android:background="@drawable/bg_tab"/>

        <android.support.v4.view.ViewPager
                android:id="@+id/pager"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_below="@+id/tabs"
                tools:context=".MainActivity"/>
    </RelativeLayout>

    <FrameLayout
            android:id="@+id/start_drawer"
            android:layout_width="250dp"
            android:layout_height="match_parent"
            android:layout_gravity="start"
            android:background="@drawable/bg_tab"></FrameLayout>
</android.support.v4.widget.DrawerLayout>

activity_main.xml

import android.app.Application; import android.os.Bundle; import android.support.v7.app.ActionBarActivity; public abstract class BaseActivity extends ActionBarActivity { private static BaseActivity mForegroundActivity; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); initView(); } protected abstract void initView() ; @Override protected void onResume() { // TODO Auto-generated method stub super.onResume(); this.mForegroundActivity = this; } public static BaseActivity getForegroundActivity(){ return mForegroundActivity; } }

import android.support.v4.app.Fragment; import android.support.v4.app.FragmentManager; import android.support.v4.app.FragmentPagerAdapter; import android.support.v4.app.FragmentStatePagerAdapter; import android.support.v4.view.ViewPager; import android.support.v4.view.ViewPager.OnPageChangeListener; import android.view.Menu; import com.heima.googleplay.fragment.AppFragment; import com.heima.googleplay.fragment.BaseFragment; import com.heima.googleplay.fragment.FragmentFactory; import com.heima.googleplay.fragment.GameFragment; import com.heima.googleplay.fragment.HomeFragment; import com.heima.googleplay.utils.UIUtils; import com.heima.googleplay.widget.PagerTab; public class MainActivity extends BaseActivity implements OnPageChangeListener { private PagerTab mTabs; private ViewPager mPager; @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } private class MainAdapter extends FragmentStatePagerAdapter{ private String[] tab_names; private BaseFragment fragment; public MainAdapter(FragmentManager fm) { super(fm); tab_names = UIUtils.getStringArray(R.array.tab_names); } @Override public CharSequence getPageTitle(int position) { // TODO Auto-generated method stub return tab_names[position]; } @Override public Fragment getItem(int position) { return FragmentFactory.createFragment(position); } @Override public int getCount() { // TODO Auto-generated method stub return tab_names.length; } } @Override protected void initView() { setContentView(R.layout.activity_main); mTabs = (PagerTab) findViewById(R.id.tabs); mPager = (ViewPager) findViewById(R.id.pager); MainAdapter adapter = new MainAdapter(getSupportFragmentManager()); mPager.setAdapter(adapter); //绑定到一起 mTabs.setViewPager(mPager); mTabs.setOnPageChangeListener(this); } @Override public void onPageScrollStateChanged(int arg0) { // TODO Auto-generated method stub } @Override public void onPageScrolled(int arg0, float arg1, int arg2) { // TODO Auto-generated method stub } @Override public void onPageSelected(int arg0) { BaseFragment fragment = FragmentFactory.createFragment(arg0); fragment.show(); } }

android 应用架构随笔五（ActionBar与侧滑菜单DrawerLayout）

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