Fragment进阶2——使用FragmentTabhost代替Tabhost
Fragment是Android 3.0 引入的新API，他使开发的效率更加高效，因为Tabhost已经不推荐使用了，现在android推荐使用FragmentTabhost，下面简单给个例子，相当于一个抛砖引玉的作用吧
系统大致结构：
一共四个选项卡，点击不同的选项卡切换到不同的fragment，在第一个fragment界面，我用ViewPager实现了一个图片轮播的功能，在第二个fragment界面实现了一个动态添加数据到GridView中的功能。
先看下activity_main.xml
<LinearLayout 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"
android:orientation="vertical" >
<FrameLayout
android:id="@+id/fl_main_content"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1" >
</FrameLayout>
<android.support.v4.app.FragmentTabHost
android:id="@android:id/tabhost"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<TabWidget
android:id="@android:id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</TabWidget>
<FrameLayout
android:id="@android:id/tabcontent"
android:layout_width="0dp"
android:layout_height="0dp" >
</FrameLayout>
</android.support.v4.app.FragmentTabHost>
</LinearLayout>
MainActivity.java如下
public class MainActivity extends FragmentActivity implements
OnTabChangeListener {
private final static String TAB_HOME = "home";
private final static String TAB_LIFE = "life";
private final static String TAB_ACCOOUNT = "account";
private final static String TAB_MORE = "more";
private long mExitTime = 0;
private TabIndicatorView homeIndicator;
private TabIndicatorView lifeIndicator;
private TabIndicatorView accountIndicator;
private TabIndicatorView moreIndicator;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main);
FragmentTabHost tabhost = (FragmentTabHost) findViewById(android.R.id.tabhost);
tabhost.setup(this, getSupportFragmentManager(), R.id.fl_main_content);
//首页选项卡
TabSpec spec = tabhost.newTabSpec(TAB_HOME);
homeIndicator = new TabIndicatorView(this);
homeIndicator.setTitle("首页");
homeIndicator.setData(R.drawable.home_normal, R.drawable.home_press);
spec.setIndicator(homeIndicator);
tabhost.addTab(spec, HomeFragment.class, null);
//生活选项卡
spec = tabhost.newTabSpec(TAB_LIFE);
lifeIndicator = new TabIndicatorView(this);
lifeIndicator.setTitle("ͨ生活");
lifeIndicator.setData(R.drawable.lifeon_normal,
R.drawable.lifeon_press);
spec.setIndicator(lifeIndicator);
tabhost.addTab(spec, LifeFragment.class, null);
//帐号选项卡
spec = tabhost.newTabSpec(TAB_ACCOOUNT);
accountIndicator = new TabIndicatorView(this);
accountIndicator.setTitle("账户");
accountIndicator.setData(R.drawable.zhanghu_normal,
R.drawable.zhanghu_press);
spec.setIndicator(accountIndicator);
tabhost.addTab(spec, AccountFragment.class, null);
//更多选项卡
spec = tabhost.newTabSpec(TAB_MORE);
moreIndicator = new TabIndicatorView(this);
moreIndicator.setTitle("更多");
moreIndicator.setData(R.drawable.gengduo_normal,
R.drawable.gengduo_press);
spec.setIndicator(moreIndicator);
tabhost.addTab(spec, MoreFragment.class, null);
tabhost.getTabWidget().setDividerDrawable(android.R.color.white);
tabhost.setCurrentTabByTag(TAB_HOME);
homeIndicator.setSelect(true);
// 点击tab事件
tabhost.setOnTabChangedListener(this);
}
@Override
public void onTabChanged(String tabId) {
homeIndicator.setSelect(false);
lifeIndicator.setSelect(false);
accountIndicator.setSelect(false);
moreIndicator.setSelect(false);
if (TAB_HOME.equals(tabId)) {
homeIndicator.setSelect(true);
} else if (TAB_LIFE.equals(tabId)) {
lifeIndicator.setSelect(true);
} else if (TAB_ACCOOUNT.equals(tabId)) {
accountIndicator.setSelect(true);
} else if (TAB_MORE.equals(tabId)) {
moreIndicator.setSelect(true);
}
}
看下第一个fragment的实现吧，剩下的可以下载下来自己看下
public class HomeFragment extends Fragment {
private View homeView;
private ViewPager viewPager;
private LinearLayout dot;
private int[] images = new int[] { R.drawable.a, R.drawable.b,
R.drawable.c, R.drawable.d, R.drawable.e, R.drawable.f };
private ImageView[] mImageViews;
private Handler mHandler = new Handler() {
public void handleMessage(Message msg) {
viewPager.setCurrentItem(viewPager.getCurrentItem() + 1);
mHandler.sendEmptyMessageDelayed(0, 4000);
};
};
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
homeView = inflater.inflate(R.layout.fragment_home, container, false);
initView();
initData();
return homeView;
}
/**
* 初始化组件
*/
private void initView() {
viewPager = (ViewPager) homeView.findViewById(R.id.viewPager);
dot = (LinearLayout) homeView.findViewById(R.id.dot);
}
private void initData() {
initDots();
mImageViews = new ImageView[images.length];
for (int i = 0; i < mImageViews.length; i++) {
mImageViews[i] = new ImageView(getActivity());
;
mImageViews[i].setBackgroundResource(images[i]);
}
HomeAdapter adapter = new HomeAdapter();
viewPager.setAdapter(adapter);
viewPager.setOnPageChangeListener(new OnPageChangeListener() {
@Override
public void onPageSelected(int position) {
updateDot();
}
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
}
@Override
public void onPageScrollStateChanged(int arg0) {
// TODO Auto-generated method stub
}
});
int centerValue = Integer.MAX_VALUE / 2;
int value = centerValue % images.length;
viewPager.setCurrentItem(centerValue - value);
updateDot();
mHandler.sendEmptyMessageDelayed(0, 4000);
}
/**
* 初始化dot点
*/
private void initDots() {
for (int i = 0; i < images.length; i++) {
View view = new View(getActivity());
LayoutParams params = new LayoutParams(8, 8);
if (i != 0) {
params.leftMargin = 5;
}
view.setLayoutParams(params);
view.setBackgroundResource(R.drawable.selecter_dot);
dot.addView(view);
}
}
// 改变dot
private void updateDot() {
int currentPage = viewPager.getCurrentItem() % images.length;
for (int i = 0; i < dot.getChildCount(); i++) {
dot.getChildAt(i).setEnabled(i == currentPage);
}
}
class HomeAdapter extends PagerAdapter {
@Override
public int getCount() {
return Integer.MAX_VALUE;
}
@Override
public boolean isViewFromObject(View arg0, Object arg1) {
return arg0 == arg1;
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
((ViewPager) container).addView(mImageViews[position
% mImageViews.length], 0);
return mImageViews[position % mImageViews.length];
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView((View) object);
}
}
}
布局文件如下：
<?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:orientation="vertical" >
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="45dp"
android:background="@drawable/blue_bg" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:text="首页"
android:textColor="#fff"
android:textSize="22sp" />
</RelativeLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="180dp" >
<android.support.v4.view.ViewPager
android:id="@+id/viewPager"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/viewPager"
android:orientation="vertical" >
<LinearLayout
android:id="@+id/dot"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:layout_marginBottom="3dp"
android:orientation="horizontal" >
</LinearLayout>
</LinearLayout>
</RelativeLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:text="首页"
android:textSize="22sp" />
</RelativeLayout>
</LinearLayout>
最后的效果如下
源代码
参考：
源代码
参考：
http://blog.csdn.net/xiaoyuan511/article/details/24882979?utm_source=tuicool&utm_medium=referral
http://www.itlanbao.com/code/100736.html