Fragment切换

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package com.bwei.cartoon;import com.bwei.cartoon.fragment.Fragment1;import com.bwei.cartoon.fragment.Fragment2;import com.bwei.cartoon.fragment.Fragment3;import com.slidingmenu.lib.SlidingMenu;import android.os.Bundle;import android.support.v4.app.FragmentActivity;import android.support.v4.app.FragmentManager;import android.support.v4.app.FragmentTransaction;import android.widget.RadioButton;import android.widget.RadioGroup;import android.widget.RadioGroup.OnCheckedChangeListener;public class MainActivity extends FragmentActivity {    private RadioButton r1;    private RadioGroup rg;    private FragmentManager manager;    private Fragment1 f1;    private Fragment2 f2;    private Fragment3 f3;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        // 获取控件        r1 = (RadioButton) findViewById(R.id.r1);        rg = (RadioGroup) findViewById(R.id.rg);        r1.setChecked(true);        // 创建一个管理类        manager = getSupportFragmentManager();        // 创建一个事物        FragmentTransaction transaction = manager.beginTransaction();        // 实例化fragment类        f1 = new Fragment1();        f2 = new Fragment2();        f3 = new Fragment3();        // 将fragment对象添加到事物中        transaction.add(R.id.fl, f1, "f1");        transaction.add(R.id.fl, f2, "f2");        transaction.add(R.id.fl, f3, "f3");        // 提交        transaction.commit();        // 单选按钮的点击事件，点击哪个按钮就显示相应的fragment        rg.setOnCheckedChangeListener(new OnCheckedChangeListener() {            @Override            public void onCheckedChanged(RadioGroup group, int checkedId) {                // TODO Auto-generated method stub                switch (checkedId) {                case R.id.r1:                    switchFragment("f1");                    break;                case R.id.r2:                    switchFragment("f2");                    break;                case R.id.r3:                    switchFragment("f3");                    break;                default:                    break;                }            }        });        //默认显示第一个fragment        switchFragment("f1");        //创建侧滑对象         SlidingMenu menu = new SlidingMenu(this);          //从左边划         menu.setMode(SlidingMenu.LEFT);          // 设置触摸屏幕的模式           menu.setTouchModeAbove(SlidingMenu.TOUCHMODE_FULLSCREEN);           // 设置滑动菜单视图的宽度          menu.setBehindOffsetRes(R.dimen.activity_cehua);         // 设置渐入渐出效果的值         menu.setFadeDegree(0.35f);           menu.attachToActivity(this, SlidingMenu.SLIDING_CONTENT);          //侧滑视图         menu.setMenu(R.layout.cehua);     }    private void switchFragment(String tag) {        //事物        FragmentTransaction transaction = manager.beginTransaction();        if("f1".equals(tag)){            transaction.show(f1);            transaction.hide(f2);            transaction.hide(f3);        }else if("f2".equals(tag)){            transaction.show(f2);            transaction.hide(f1);            transaction.hide(f3);        }else if("f3".equals(tag)){            transaction.show(f3);            transaction.hide(f1);            transaction.hide(f2);        }        transaction.commit();    }}
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