Fragment中监听onKey事件

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项目中越来越多的用到Fragment，在用Fragment取代TabHost的时候遇到了一个问题，我们都知道，TabHost的Tab为Activity实例，有OnKey事件，但是Fragment中没有，但是又必须监听OnKey事件怎么办（不仅仅是退出哦）,如果仅仅是退出我们可以在Activity中进行统一处理.

　　下面记录一下在ActionBar中监听Fragment的onKey事件。

　　ActionBar实现Onkey事件，判断当前的fragment是哪一个，是不是所需要的Fragment,然后在需要监听OnKey事件的Fragment中写一个静态方法，传递keycode与event事件即可。

package info.androidhive.tabsswipe;import info.androidhive.tabsswipe.adapter.TabsPagerAdapter;import android.annotation.SuppressLint;import android.app.SearchManager;import android.content.Context;import android.support.v7.app.ActionBar;import android.support.v7.app.ActionBar.Tab;import android.support.v7.app.ActionBarActivity;import android.support.v7.widget.SearchView;import android.os.Bundle;import android.support.v4.app.Fragment;import android.support.v4.view.MenuItemCompat;import android.support.v4.view.ViewPager;import android.util.Log;import android.view.KeyEvent;import android.view.Menu;import android.view.MenuItem;@SuppressLint("NewApi")public class MainActivity extends ActionBarActivity  implements        ActionBar.TabListener {    private ViewPager viewPager;    private TabsPagerAdapter mAdapter;    private ActionBar actionBar;    private Fragment fg;    // Tab titles    private String[] tabs = { "TopRatedFragment", "GamesFragment", "MoviesFragment" };    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        // Initilization        viewPager = (ViewPager) findViewById(R.id.pager);        actionBar = getSupportActionBar();        mAdapter = new TabsPagerAdapter(getSupportFragmentManager());        viewPager.setOffscreenPageLimit(3);        viewPager.setAdapter(mAdapter);        actionBar.setHomeButtonEnabled(false);        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);                // Adding Tabs        for (String tab_name : tabs) {            actionBar.addTab(actionBar.newTab().setText(tab_name)                    .setTabListener(this));        }        /**         * on swiping the viewpager make respective tab selected         * */        viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {            public void onPageSelected(int position) {                // on changing the page                // make respected tab selected//                actionBar.setSelectedNavigationItem(position);                actionBar.selectTab(actionBar.getTabAt(position));                mAdapter.getItem(position);                            }            public void onPageScrolled(int arg0, float arg1, int arg2) {            }            public void onPageScrollStateChanged(int arg0) {            }        });    }    @Override    public boolean onCreateOptionsMenu(Menu menu) {//                SearchManager searchManager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);        getMenuInflater().inflate(R.menu.main, menu);        MenuItem searchItem = menu.findItem(R.id.action_settings);        SearchView searchview = (SearchView)MenuItemCompat.getActionView(searchItem);        searchview.setSearchableInfo(searchManager.getSearchableInfo(getComponentName()));        return super.onCreateOptionsMenu(menu);    }            public void onTabReselected(Tab arg0,            android.support.v4.app.FragmentTransaction arg1) {        // TODO Auto-generated method stub            }    public void onTabSelected(Tab arg0,            android.support.v4.app.FragmentTransaction arg1) {        // TODO Auto-generated method stub        viewPager.setCurrentItem(arg0.getPosition());        fg = mAdapter.getItem(arg0.getPosition());        Log.d("fg", fg+"");    }    public void onTabUnselected(Tab arg0,            android.support.v4.app.FragmentTransaction arg1) {        // TODO Auto-generated method stub            }    @Override    public boolean onKeyDown(int keyCode, KeyEvent event) {        // TODO Auto-generated method stub        Log.d("ActionBar", "OnKey事件");        if(fg instanceof GamesFragment){            GamesFragment.onKeyDown(keyCode, event);        }        return super.onKeyDown(keyCode, event);    }}

其中一个Fragment

package info.androidhive.tabsswipe;import info.androidhive.tabsswipe.R;import android.os.Bundle;import android.support.v4.app.Fragment;import android.util.Log;import android.view.KeyEvent;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.Toast;public class GamesFragment extends Fragment {    private View view;    @Override    public View onCreateView(LayoutInflater inflater, ViewGroup container,            Bundle savedInstanceState) {        if (view == null) {            view = inflater.inflate(R.layout.fragment_games, container, false);        }        ViewGroup parent = (ViewGroup) view.getParent();        if (parent != null) {            parent.removeView(view);        }        return view;    }    @Override    public void onResume() {        super.onResume();        // 判断当前fragment是否显示        if (getUserVisibleHint()) {            showdata();        }    }    @Override    public void setUserVisibleHint(boolean isVisibleToUser) {        super.setUserVisibleHint(isVisibleToUser);        // 每次切换fragment时调用的方法        if (isVisibleToUser) {            showdata();        }    }    private void showdata() {        Toast.makeText(getActivity(), "Game", Toast.LENGTH_LONG).show();    }    public static boolean onKeyDown(int keyCode, KeyEvent event) {        // TODO Auto-generated method stub        if (keyCode == event.KEYCODE_BACK) {            Log.d("GameFragmet事件", "OK");        }        return true;    }}

最后当我在Fragment中触发Onkey事件后打印日志

原文链接：http://blog.csdn.net/gebitan505/article/details/38396495

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