fragment简单使用

来源：互联网发布：java 1.7.0 64 bit 编辑：程序博客网时间：2024/06/09 23:49

项目中经常会用到fragment，写了个简单的demo

Activity

public class MainActivity extends FragmentActivity implements OnClickListener {    private FrameLayout frame;    private LinearLayout layout_car;    private LinearLayout layout_home;    private ImageButton car;    private ImageButton home;    private Fragment tab1;    private Fragment tab2;    @Override    protected void onCreate(Bundle savedInstanceState) {        // TODO Auto-generated method stub        super.onCreate(savedInstanceState);        requestWindowFeature(Window.FEATURE_NO_TITLE);        setContentView(R.layout.main_activity);        initView();        eventView();        seletor(0);    }    private void initView() {        layout_car = (LinearLayout) findViewById(R.id.layout_car);        layout_home = (LinearLayout) findViewById(R.id.layout_home);        car = (ImageButton) findViewById(R.id.car);        home = (ImageButton) findViewById(R.id.home);    }    private void eventView() {        layout_car.setOnClickListener(this);        layout_home.setOnClickListener(this);    }    @Override    public void onClick(View v) {        resetImg();        switch (v.getId()) {        case R.id.layout_car:            seletor(0);            break;        case R.id.layout_home:            seletor(1);            break;        default:            break;        }    }    private void seletor(int i) {        FragmentManager fm = getSupportFragmentManager();        FragmentTransaction transaction = fm.beginTransaction();        hideFragment(transaction);        switch (i) {        case 0:            if (tab1 == null) {                tab1 = new CarFragment();                transaction.add(R.id.frame, tab1);            }else{                transaction.show(tab1);            }            car.setImageResource(R.drawable.n_distribution_l);            break;        case 1:            if (tab2 == null) {                tab2 = new HomeFragment();                transaction.add(R.id.frame, tab2);            }else{                transaction.show(tab2);            }            home.setImageResource(R.drawable.n_home_l);            break;        default:            break;        }        transaction.commit();    }    private void hideFragment(FragmentTransaction transaction) {        if (tab1 !=null) {            transaction.hide(tab1);        }        if (tab2 !=null) {            transaction.hide(tab2);        }    }    private void resetImg() {        car.setImageResource(R.drawable.n_distribution_h);        home.setImageResource(R.drawable.n_home_h);    }}

使用FragmentTransaction的show/hide来显示/隐藏fragment，不会销毁fragment实例，fragment跳转切换数据不重新加载

Fragment

public class CarFragment extends Fragment {    @Override    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {        return inflater.inflate(R.layout.car, container, false);    }    @Override    public void onViewCreated(View view, Bundle savedInstanceState) {        super.onViewCreated(view, savedInstanceState);        initView(view);        addListener();    }    @Override    public void onActivityCreated(Bundle savedInstanceState) {        super.onActivityCreated(savedInstanceState);    }}

main_activity.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >    <include layout="@layout/top"/>    <FrameLayout         android:id="@+id/frame"        android:layout_width="match_parent"        android:layout_height="0dp"        android:layout_weight="1"        >    </FrameLayout>    <include layout="@layout/bottom"/></LinearLayout>

top和bottom分别是顶部标题和底部标签切换fragment控件

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