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转载请注明出处：http://blog.csdn.net/q649381130/article/details/51346551
上一篇已经介绍了fragment的使用封装，读者可以点击链接查看fragment的使用封装（上）:http://blog.csdn.net/q649381130/article/details/51340544。
本文主要采用其他方式，实现对fragment的添加切换操作。效果图就不上了，跟上篇一样。
在Activity中我们添加一下常量，表示对于fragment的tag标示，用枚举一样的效果。
public static final String FRAM_SET_HOME = "设置主页";
public static final String FRAM_SET_ALBUM = "相册";
public static final String FRAM_SET_COLLECT = "收藏";
public static final String FRAM_SET_WALLET = "钱包";
public static final String FRAM_SET_COUPON = "卡劵";
public static final String FRAM_SET_FACE = "表情";
public static final String FRAM_SET_PERSON = "个人";
public static final String FRAM_SET_SYS = "系统设置";提供一个工厂方法，根据传入的tag进行fragment对象的创建
private Fragment fragmentFactory(String tag)
{
Fragment fragment = null;
switch (tag)
{
case FRAM_SET_HOME://主页
fragment = new SettingHomeFragment();
break;
case FRAM_SET_ALBUM://相册
fragment = new SettingAlbumFragment();
break;
case FRAM_SET_COLLECT://收藏
fragment = new SettingCollectionFragment();
break;
case FRAM_SET_COUPON://卡劵
fragment = new SettingCouponFragment();
break;
case FRAM_SET_FACE://表情
fragment = new SettingFaceFragment();
break;
case FRAM_SET_PERSON://个人
fragment = new SettingPersonFragment();
break;
case FRAM_SET_WALLET://钱包
fragment = new SettingWalletFragment();
break;
case FRAM_SET_SYS://系统设置
break;
default:
Log.e("fragmentFactory", "找不到指定tag+["+tag+"]+的fragment");
break;
}
return fragment;
}提供一个切换显示fragment的方法，传入tag值，根据tag值显示对应的页面。首先我们先去栈中查找看是否存在对应的fragment，如果已经存在就直接显示隐藏，否则使用工厂方法创建实例在add进来，add的时候将tag与新建的fragment对象对应起来。
public void replaceFragment(String tag)
{
Fragment fragment = mFragmentManager.findFragmentByTag(tag);
if (fragment != null)
{
mFragmentManager.beginTransaction()
.show(fragment)
.hide(mCurrentFragment)
.commitAllowingStateLoss();
} else
{
fragment = fragmentFactory(tag);
if (fragment == null)
{
return;
}
mFragmentManager.beginTransaction()
.add(R.id.rl_container_main, fragment, tag)
.hide(mCurrentFragment)
.commit();
}
mCurrentFragment = fragment;
}完整代码业务逻辑还是很简单的，这里我们重写了onBackpress()方法，控制当用户点击返回键时，如果当前页面是列表页则退出Activity，否则切换显示列表页面。
当然还要重写onSaveInstanceState()，防止重复显示的bug。具体解释看我的上一篇博客。
public class MainActivity extends FragmentActivity
{
private FragmentManager mFragmentManager;
// 当前显示的fragment
Fragment mCurrentFragment;
public static final String FRAM_SET_HOME = "设置主页";
public static final String FRAM_SET_ALBUM = "相册";
public static final String FRAM_SET_COLLECT = "收藏";
public static final String FRAM_SET_WALLET = "钱包";
public static final String FRAM_SET_COUPON = "卡劵";
public static final String FRAM_SET_FACE = "表情";
public static final String FRAM_SET_PERSON = "个人";
public static final String FRAM_SET_SYS = "系统设置";
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.empty_activity);
mFragmentManager = getSupportFragmentManager();
// 添加主页面
SettingHomeFragment settingHomeFragment = new SettingHomeFragment();
mFragmentManager.beginTransaction()
.add(R.id.rl_container_main, settingHomeFragment, FRAM_SET_HOME)
.commitAllowingStateLoss();
mCurrentFragment = settingHomeFragment;
}
@Override
public void onBackPressed()
{
if (mCurrentFragment instanceof SettingHomeFragment)
{
finish();
} else
{
replaceFragment(FRAM_SET_HOME);
}
}
@Override
protected void onSaveInstanceState(Bundle arg0)
{
// super.onSaveInstanceState(arg0);
}
public void replaceFragment(String tag)
{
Fragment fragment = mFragmentManager.findFragmentByTag(tag);
if (fragment != null)
{
mFragmentManager.beginTransaction()
.show(fragment)
.hide(mCurrentFragment)
.commitAllowingStateLoss();
} else
{
fragment = fragmentFactory(tag);
if (fragment == null)
{
return;
}
mFragmentManager.beginTransaction()
.add(R.id.rl_container_main, fragment, tag)
.hide(mCurrentFragment)
.commit();
}
mCurrentFragment = fragment;
}
private Fragment fragmentFactory(String tag)
{
Fragment fragment = null;
switch (tag)
{
case FRAM_SET_HOME:// 主页
fragment = new SettingHomeFragment();
break;
case FRAM_SET_ALBUM:// 相册
fragment = new SettingAlbumFragment();
break;
case FRAM_SET_COLLECT:// 收藏
fragment = new SettingCollectionFragment();
break;
case FRAM_SET_COUPON:// 卡劵
fragment = new SettingCouponFragment();
break;
case FRAM_SET_FACE:// 表情
fragment = new SettingFaceFragment();
break;
case FRAM_SET_PERSON:// 个人
fragment = new SettingPersonFragment();
break;
case FRAM_SET_WALLET:// 钱包
fragment = new SettingWalletFragment();
break;
case FRAM_SET_SYS:// 系统设置
break;
default:
Log.e("fragmentFactory", "找不到指定tag+[" + tag + "]+的fragment");
break;
}
return fragment;
}
}fragmnet页面与上篇博客类似，为了篇幅只贴上SettingHomeFragment的点击事件的处理,文章最后会提供完整代码下载地址
@Override
public void onClick(View v)
{
switch (v.getId())
{
case R.id.tv_person_setting_home:// 个人信息设置
mActivity.replaceFragment(MainActivity.FRAM_SET_PERSON);
break;
case R.id.tv_album_setting_home:// 相册
mActivity.replaceFragment(MainActivity.FRAM_SET_ALBUM);
break;
case R.id.tv_collection_setting_home:// 收藏
mActivity.replaceFragment(MainActivity.FRAM_SET_COLLECT);
break;
case R.id.tv_wallet_setting_home:// 钱包
mActivity.replaceFragment(MainActivity.FRAM_SET_WALLET);
break;
case R.id.tv_coupon_setting_home:// 卡卷
mActivity.replaceFragment(MainActivity.FRAM_SET_COUPON);
break;
case R.id.tv_face_setting_home:// 表情
mActivity.replaceFragment(MainActivity.FRAM_SET_FACE);
break;
case R.id.tv_sysset_setting_home:// 系统设置
mActivity.replaceFragment(MainActivity.FRAM_SET_SYS);
break;
default:
break;
}
}文艺式的精髓就是使用指定view的id作为tag，这样实现对代码的最大化精简，减少配置参数。
先看HomeSettingFragment中的代码，在自定义点击事件中，我们直接调用MainActivity的replace方式，传入被点击的view的id即可。
public class SettingHomeFragment1 extends Fragment
{
/**
* 跟布局view
*/
View mRootView;
private MainActivity1 mActivity;
private OnClickListener mClickListener = new OnClickListener()
{
@Override
public void onClick(View v)
{
mActivity.replaceFragment(v.getId());
}
};
@Override
@Nullable
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container,
@Nullable Bundle savedInstanceState)
{
mRootView = inflater.inflate(R.layout.setting_home_fragment, container, false);
mActivity = (MainActivity1) getActivity();
setListener();
return mRootView;
}
private void setListener()
{
mRootView.findViewById(R.id.tv_person_setting_home).setOnClickListener(mClickListener);
mRootView.findViewById(R.id.tv_album_setting_home).setOnClickListener(mClickListener);
mRootView.findViewById(R.id.tv_collection_setting_home).setOnClickListener(mClickListener);
mRootView.findViewById(R.id.tv_wallet_setting_home).setOnClickListener(mClickListener);
mRootView.findViewById(R.id.tv_coupon_setting_home).setOnClickListener(mClickListener);
mRootView.findViewById(R.id.tv_face_setting_home).setOnClickListener(mClickListener);
mRootView.findViewById(R.id.tv_sysset_setting_home).setOnClickListener(mClickListener);
}
}然后在MainActivity中，我们根据传入的id进行fragment的创建，添加，查找。大量减少一些常量，可以降低在出现差错的风险。
public class MainActivity1 extends FragmentActivity
{
private FragmentManager mFragmentManager;
// 当前显示的fragment
Fragment mCurrentFragment;
private static final int HOME_TAG = 1;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.empty_activity);
mFragmentManager = getSupportFragmentManager();
// 添加主页面
SettingHomeFragment1 settingHomeFragment = new SettingHomeFragment1();
mFragmentManager.beginTransaction()
.add(R.id.rl_container_main, settingHomeFragment, String.valueOf(HOME_TAG))
.commitAllowingStateLoss();
mCurrentFragment = settingHomeFragment;
}
@Override
public void onBackPressed()
{
if (mCurrentFragment instanceof SettingHomeFragment1)
{
finish();
} else
{
replaceFragment(HOME_TAG);
}
}
@Override
protected void onSaveInstanceState(Bundle arg0)
{
// super.onSaveInstanceState(arg0);
}
public void replaceFragment(int id)
{
Fragment fragment = mFragmentManager.findFragmentByTag(String.valueOf(id));
if (fragment != null)
{
mFragmentManager.beginTransaction()
.show(fragment)
.hide(mCurrentFragment)
.commitAllowingStateLoss();
} else
{
fragment = fragmentFactory(id);
if (fragment == null)
{
return;
}
mFragmentManager.beginTransaction()
.add(R.id.rl_container_main, fragment, String.valueOf(id))
.hide(mCurrentFragment)
.commit();
}
mCurrentFragment = fragment;
}
private Fragment fragmentFactory(int id)
{
Fragment fragment = null;
switch (id)
{
case R.id.tv_album_setting_home:// 相册
fragment = new SettingAlbumFragment();
break;
case R.id.tv_collection_setting_home:// 收藏
fragment = new SettingCollectionFragment();
break;
case R.id.tv_coupon_setting_home:// 卡劵
fragment = new SettingCouponFragment();
break;
case R.id.tv_face_setting_home:// 表情
fragment = new SettingFaceFragment();
break;
case R.id.tv_person_setting_home:// 个人
fragment = new SettingPersonFragment();
break;
case R.id.tv_wallet_setting_home:// 钱包
fragment = new SettingWalletFragment();
break;
case R.id.tv_sysset_setting_home:// 系统设置
fragment = new SettingSysFragment();
break;
default:
break;
}
return fragment;
}
}最后奉上demo下载地址
敬请期待我的下一篇博客，fragment的封装。
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原文地址：http://blog.csdn.net/q649381130/article/details/51346551
