Android编程心得-FragmentActivity与Fragment两者交互方法简介

在Android4.0后很多时候我们会大量使用到Fragment,Fragment与Activity的交互应该来说是非常重要的，但目前很多实例方法都只介绍了Fragment与Activity交互的方法，没有Activity与Fragment交互的方法，下面我来把解决的思路记录如下。

1.首先我需要定义一个公共接口，用于将Fragment与FragmentActivity中的控件进行交互

public interface IBtnCallListener {       public void transfermsg();}

2.当fragment中的Button控件需要与FragmentActivity中的Button控件交互时，在Fragment对应的子类中定义

public class LaunchUIFragment extends Fragment implements IBtnCallListener{IBtnCallListener mbtnListener; private Button btn_Click;@Overridepublic View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {View rootView = inflater.inflate(R.layout.fragment_selection_launch, container, false);btn_Click=(Button) rootView.findViewById(R.id.bt_click);btn_Click.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubmbtnListener.transfermsg();}});return rootView;}@Overridepublic void onActivityCreated(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onActivityCreated(savedInstanceState);}@Overridepublic void onAttach(Activity activity) {// TODO Auto-generated method stubtry {mbtnListener=(IBtnCallListener) activity;} catch (Exception e) {// TODO: handle exceptionthrow new ClassCastException(activity.toString() + "must implement mbtnListener");}super.onAttach(activity);}@Overridepublic void transfermsg() {// TODO Auto-generated method stubSystem.out.println("由Activity传输过来的信息");}}

同时在FragmentActivity中对应相应

public class MainActivity extends FragmentActivity implements IBtnCallListener{public static final String ARGUMENTS_NAME = "arg";private RelativeLayout rl_nav;private SyncHorizontalScrollView mHsv;private RadioGroup rg_nav_content;private ImageView iv_nav_indicator;private ImageView iv_nav_left;private ImageView iv_nav_right;private ViewPager mViewPager;private int indicatorWidth;public static String[] tabTitle = { "选项1", "选项2", "选项3", "选项4", "选项5" };//标题private LayoutInflater mInflater;private TabFragmentPagerAdapter mAdapter;private int currentIndicatorLeft = 0;private Button Btn_Test;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);findViewById();initView();setListener();}      /*private void setListener() {mViewPager.setOnPageChangeListener(new OnPageChangeListener() {@Overridepublic void onPageSelected(int position) {if(rg_nav_content!=null && rg_nav_content.getChildCount()>position){((RadioButton)rg_nav_content.getChildAt(position)).performClick();}}@Overridepublic void onPageScrolled(int arg0, float arg1, int arg2) {}@Overridepublic void onPageScrollStateChanged(int arg0) {}});rg_nav_content.setOnCheckedChangeListener(new OnCheckedChangeListener() {@Overridepublic void onCheckedChanged(RadioGroup group, int checkedId) {if(rg_nav_content.getChildAt(checkedId)!=null){TranslateAnimation animation = new TranslateAnimation(currentIndicatorLeft ,((RadioButton) rg_nav_content.getChildAt(checkedId)).getLeft(), 0f, 0f);animation.setInterpolator(new LinearInterpolator());animation.setDuration(100);animation.setFillAfter(true);//执行位移动画iv_nav_indicator.startAnimation(animation);mViewPager.setCurrentItem(checkedId);//ViewPager 跟随一起 切换//记录当前 下标的距最左侧的 距离currentIndicatorLeft = ((RadioButton) rg_nav_content.getChildAt(checkedId)).getLeft();mHsv.smoothScrollTo((checkedId > 1 ? ((RadioButton) rg_nav_content.getChildAt(checkedId)).getLeft() : 0) - ((RadioButton) rg_nav_content.getChildAt(2)).getLeft(), 0);}}});}private void initView() {DisplayMetrics dm = new DisplayMetrics();getWindowManager().getDefaultDisplay().getMetrics(dm);indicatorWidth = dm.widthPixels / 4;LayoutParams cursor_Params = iv_nav_indicator.getLayoutParams();cursor_Params.width = indicatorWidth;// 初始化滑动下标的宽iv_nav_indicator.setLayoutParams(cursor_Params);mHsv.setSomeParam(rl_nav, iv_nav_left, iv_nav_right, this);//获取布局填充器mInflater = (LayoutInflater)this.getSystemService(LAYOUT_INFLATER_SERVICE);//另一种方式获取//LayoutInflater mInflater = LayoutInflater.from(this);  initNavigationHSV();mAdapter = new TabFragmentPagerAdapter(getSupportFragmentManager());mViewPager.setAdapter(mAdapter);Btn_Test=(Button) findViewById(R.id.btn_test);Btn_Test.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubmBtnCallListener.transfermsg();}});}*/private IBtnCallListener mBtnCallListener;@Overridepublic void onAttachFragment(Fragment fragment) {// TODO Auto-generated method stubtry {mBtnCallListener=(IBtnCallListener) fragment;} catch (Exception e) {// TODO: handle exception}super.onAttachFragment(fragment);}       @Overridepublic void transfermsg() {// TODO Auto-generated method stubSystem.out.println("由Fragment传输过来的信息");}/*private void initNavigationHSV() {rg_nav_content.removeAllViews();for(int i=0;i<tabTitle.length;i++){RadioButton rb = (RadioButton) mInflater.inflate(R.layout.nav_radiogroup_item, null);rb.setId(i);rb.setText(tabTitle[i]);rb.setLayoutParams(new LayoutParams(indicatorWidth,LayoutParams.MATCH_PARENT));rg_nav_content.addView(rb);}}private void findViewById() {rl_nav = (RelativeLayout) findViewById(R.id.rl_nav);mHsv = (SyncHorizontalScrollView) findViewById(R.id.mHsv);rg_nav_content = (RadioGroup) findViewById(R.id.rg_nav_content);iv_nav_indicator = (ImageView) findViewById(R.id.iv_nav_indicator);iv_nav_left = (ImageView) findViewById(R.id.iv_nav_left);iv_nav_right = (ImageView) findViewById(R.id.iv_nav_right);mViewPager = (ViewPager) findViewById(R.id.mViewPager);}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {getMenuInflater().inflate(R.menu.main, menu);return true;}public static class TabFragmentPagerAdapter extends FragmentPagerAdapter{public TabFragmentPagerAdapter(FragmentManager fm) {super(fm);}@Overridepublic Fragment getItem(int arg0) {Fragment ft = null;switch (arg0) {case 0:ft = new LaunchUIFragment();break;default:ft = new CommonUIFragment();Bundle args = new Bundle();args.putString(ARGUMENTS_NAME, tabTitle[arg0]);ft.setArguments(args);break;}return ft;}@Overridepublic int getCount() {return tabTitle.length;}}*/}

其中，主要部分是Fragment需要重写OnAttach方法，将接口对象实例化，同时在Activity要实现对应接口的方法，在该方法中实现你想要的功能，这样就可以由Fragment灵活交互FragmentActivity中的内容与控件了

同理，FragmentActivity想要交互对应的Fragment也需要重写FragmentActivity的OnAttachFragment方法，同时在

Fragment中实现对应接口的方法，在该方法中实现你想要的功能，这样就可以由FragmentActivity灵活交互Fragment中的内容与控件了  (主要看没有注释的部分)

其实，交互的思路都是一样的，全都是通过一个公共的接口调用，在对应的地方实现。