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

2021-07-20 05:19:17

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

分主页和侧滑页两个页面，侧滑页为：

start从左到右滑动，end从右到左滑动

继承ActionBarActivity

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;

    }

}

BaseActivity

setContentView(R.layout.activity_main);

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();

    }

}

MainActivity

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