Android programming experience-Introduction to the interaction between FragmentActivity and Fragment

public interface IBtnCallListener {       public void transfermsg();}

Public class extends Fragment implements IBtnCallListener {IBtnCallListener mbtnListener; private Button btn_Click; @ Overridepublic View onCreateView (extends inflater, ViewGroup container, Bundle attributes) {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 ("information transmitted by Activity ");}}

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 listener; private ImageView iv_nav_right; private ViewPager mViewPager; private int indicatorWidth; public static Stri Ng [] tabTitle = {"option 1", "option 2", "option 3", "option 4", "option 5"}; // Title 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 )). extends mclick () ;}@ 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_n Av_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); // execute the displacement animation iv_nav_indicator.startAnimation (animation); mViewPager. setCurrentItem (checkedId); // switch with ViewPager // record the current distance from the Left to currentIndica TorLeft = (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 (). getdefadisplay display (). getMetrics (dm); indicatorWidth = dm. widthPixels/4; LayoutParams cursor_Params = extract (); cursor_Params.width = indicatorWidth; // initialize the width of the sliding bottom object iv_nav_indicator.setLayoutParams (cursor_Params); mHsv. setSomeParam (rl_nav, iv_nav_left, iv_nav_right, this); // get the layout filler mInflater = (LayoutInflater) this. getSystemService (LAYOUT_INFLATER_SERVICE); // you can get it in another way. // 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 listener (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 ("information transmitted by Fragment");}/* 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 ;}}*/}

Flexible Interaction