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

转载http://www.tuicool.com/articles/YVjmYr

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;
  @Override
  public 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() {
      
      @Override
      public void onClick(View v) {
        // TODO Auto-generated method stub
        mbtnListener.transfermsg();
      }
    });
    
    return rootView;
  }
  @Override
  public void onActivityCreated(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onActivityCreated(savedInstanceState);
    
  }
  @Override
  public void onAttach(Activity activity) {
    // TODO Auto-generated method stub
    
    try {		
      mbtnListener=(IBtnCallListener) activity;
    } catch (Exception e) {
      // TODO: handle exception
      throw new ClassCastException(activity.toString() + "must implement mbtnListener");
    }
    
    super.onAttach(activity);
  }
  @Override
  public void transfermsg() {
    // TODO Auto-generated method stub
    System.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;
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    
    findViewById();
    initView();
    setListener();
  }
      /*
 private void setListener() {
  
  mViewPager.setOnPageChangeListener(new OnPageChangeListener() {
   
   @Override
   public void onPageSelected(int position) {
    
    if(rg_nav_content!=null && rg_nav_content.getChildCount()>position){
     ((RadioButton)rg_nav_content.getChildAt(position)).performClick();
    }
   }
   
   @Override
   public void onPageScrolled(int arg0, float arg1, int arg2) {
    
   }
   
   @Override
   public void onPageScrollStateChanged(int arg0) {
    
   }
  });
  
  rg_nav_content.setOnCheckedChangeListener(new OnCheckedChangeListener() {
   
   @Override
   public 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() {
   
   @Override
   public void onClick(View v) {
    // TODO Auto-generated method stub
    mBtnCallListener.transfermsg();
   }
  });
 }
*/
  private IBtnCallListener mBtnCallListener;
  
  
  @Override
  public void onAttachFragment(Fragment fragment) {
    // TODO Auto-generated method stub
    
    try {
      mBtnCallListener=(IBtnCallListener) fragment;
    } catch (Exception e) {
      // TODO: handle exception
    }
    
    super.onAttachFragment(fragment);
  }
       @Override
  public void transfermsg() {
    // TODO Auto-generated method stub
    System.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);
 }

 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
  getMenuInflater().inflate(R.menu.main, menu);
  return true;
 }
 
 public static class TabFragmentPagerAdapter extends FragmentPagerAdapter{

  public TabFragmentPagerAdapter(FragmentManager fm) {
   super(fm);
  }

  @Override
  public 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;
  }

  @Override
  public 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， Fragment Activity想要交互对应的Fragment也需要重写 Fragment Activity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Fragment Activity 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。