Fragment(二)

1、先建立一个类（IconFramgnetBean），在里面定义出需要的图片，标题，所需要的类（Class

IconFramgnetBean

public class IconFramgnetBean {
    private int iconResId;
    private String title;
    private Class<?> clazz;

    public IconFramgnetBean(int iconResId,Class<?> clazz) {
        this.iconResId = iconResId;
        this.clazz = clazz;
    }

    public IconFramgnetBean(int iconResId,String title,Class<?> clazz) {
        this.iconResId = iconResId;
        this.title = title;
        this.clazz = clazz;
    }

    public int getIconResId() {
        return iconResId;
    }

    public void setIconResId(int iconResId) {
        this.iconResId = iconResId;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public Class<?> getClazz() {
        return clazz;
    }

    public void setClazz(Class<?> clazz) {
        this.clazz = clazz;
    }

}

2、建立所需的Fragment：如下

建立所需的Fragment

FragmentHome:

public class FragmentHome extends Fragment {
    public static final int RESID = R.drawable.tab_home;
    public static final String TITLE = "首页";

    @Override
    public View onCreateView(LayoutInflater inflater,ViewGroup container,Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_home,container,false);
        return view;
    }
}

FragmentSay :

public class FragmentSay extends Fragment {
    public static final int RESID = R.drawable.tab_say;
    public static final String TITLE = "咨询";

    @Override
    public View onCreateView(LayoutInflater inflater,Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_say,null);
        return view;
    }
}

FragmentShopCar :

public class FragmentShopCar extends Fragment {
    public static final int RESID = R.drawable.tab_shopcar;
    public static final String TITLE = "购物车";

    @Override
    public View onCreateView(LayoutInflater inflater,Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_shopcar,null);
        return view;
    }

}

FragmentMy :

public class FragmentMy extends Fragment {
    public static final int RESID = R.drawable.tab_my;
    public static final String TITLE = "我的";

    @Override
    public View onCreateView(LayoutInflater inflater,Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_my,null);
        return view;
    }

}

XML文件

fragment_home.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:gravity="center"
    android:orientation="vertical" >
    <ImageView 
    android:id="@+id/fragment_first"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:src="@drawable/home"/>

</LinearLayout>

fragment_say.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:gravity="center"
    android:orientation="vertical" >

<ImageView 
    android:id="@+id/fragment_second"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:src="@drawable/say"/>
</LinearLayout>

fragment_shopcar.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:gravity="center"
    android:orientation="vertical" >

<ImageView
    android:id="@+id/fragment_third"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:src="@drawable/shopcar"
   />
</LinearLayout>

fragment_my.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:gravity="center"
    android:orientation="vertical" >

<ImageView 
    android:id="@+id/fragment_fourth"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:src="@drawable/my"
   />
</LinearLayout>

activity_main.xml:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <FrameLayout
        android:id="@+id/realTabContent"
        android:layout_width="fill_parent"
        android:layout_height="0dip"
        android:layout_weight="1" />

    <android.support.v4.app.FragmentTabHost
        android:id="@android:id/tabhost"
        android:layout_width="fill_parent"
        android:layout_height="50dip"
        android:background="@null" >

        <FrameLayout
            android:id="@android:id/tabcontent"
            android:layout_width="0dp"
            android:layout_height="0dp"
            android:layout_weight="0" />
    </android.support.v4.app.FragmentTabHost>

</LinearLayout>

MainActivity

public class MainActivity extends FragmentActivity {

    private List<IconFramgnetBean> beans;
    private FragmentTabHost mTabHost;

    private Activity getSelf() {
        return MainActivity.this;
    }

    @Override
    protected void onCreate(Bundle arg0) {
        super.onCreate(arg0);
        beans = InitConfig.initIconFragmentBeans();
        requestwindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_main);
        mTabHost = (FragmentTabHost) findViewById(android.R.id.tabhost);
        mTabHost.setup(getSelf(),getSupportFragmentManager(),R.id.realTabContent);
        mTabHost.getTabWidget().setDividerDrawable(null);
        // 得到fragment的个数
        if (beans != null && !beans.isEmpty()) {
            int count = beans.size();
            for (int i = 0; i < count; i++) {
                IconFramgnetBean iconTextBean = beans.get(i);
                TabSpec tabSpec = mTabHost.newTabSpec(iconTextBean.getTitle()).setIndicator(getTabItemView(LayoutInflater.from(getSelf()),iconTextBean));
                mTabHost.addTab(tabSpec,iconTextBean.getClazz(),null);
            }
            mTabHost.setCurrentTab(0);
            mTabHost.setonTabChangedListener(new OnTabchangelistener() {
                @Override
                public void onTabChanged(String tabId) {
                    mTabHost.setCurrentTabByTag(tabId);
                }
            });
        }

    }

    /** * 给Tab按钮设置图标和文字 */
    private View getTabItemView(LayoutInflater inflater,IconFramgnetBean iconTextBean) {
        ImageView imageView = new ImageView(getSelf());
        imageView.setBackgroundResource(iconTextBean.getIconResId());
        return imageView;
    }


    boolean bExit = true;

    @Override
    public boolean onKeyDown(int keyCode,KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_BACK) {
            if (bExit) {
                final Timer TTimer = new Timer();
                TTimer.schedule(new TimerTask() {
                    @Override
                    public void run() {
                        TTimer.cancel();
                        bExit = true;
                    }
                },1000);
                Toast.makeText(getSelf(),"再按一次退出",Toast.LENGTH_SHORT).show();
                bExit = false;
            } else {
                getSelf().finish();
            }
        }
        return false;
    }

}

InitConfig

public class InitConfig {
    public static List<IconFramgnetBean> initIconFragmentBeans() {
        List<IconFramgnetBean> beans = new ArrayList<IconFramgnetBean>();
        beans.add(new IconFramgnetBean(FragmentHome.RESID,FragmentHome.TITLE,FragmentHome.class));
        beans.add(new IconFramgnetBean(FragmentSay.RESID,FragmentSay.TITLE,FragmentSay.class));
        beans.add(new IconFramgnetBean(FragmentShopCar.RESID,FragmentShopCar.TITLE,FragmentShopCar.class));
        beans.add(new IconFramgnetBean(FragmentMy.RESID,FragmentMy.TITLE,FragmentMy.class));
        return beans;
    }
}

drawable.tab_home

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@drawable/shouyeanxia" android:state_selected="true"/>
    <item android:drawable="@drawable/shouyeanxia" android:state_pressed="true"/>
    <item android:drawable="@drawable/shouye"/>
</selector>