Android开发-fragment切换、hide、show、fragmentmanager的基础应用

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一、首先创建一个activity，开辟一块帧布局，用来放置fragment，写四个单选按钮用来控制切换。

二、

private MyFragment f1, f2, f3, f4, index;Bundle bundle;FragmentTransaction transaction;FragmentManager manager;RadioGroup rg;

（index 总是指向当前fragment）

获取到fragmentManager，初始化fragment：

f1 = new MyFragment();bundle = new Bundle();bundle.putInt("color", Color.BLUE);f1.setArguments(bundle);index = f1;f2 = new MyFragment();bundle = new Bundle();bundle.putInt("color", Color.RED);f2.setArguments(bundle);f3 = new MyFragment();bundle = new Bundle();bundle.putInt("color", Color.GREEN);f3.setArguments(bundle);f4 = new MyFragment();bundle = new Bundle();bundle.putInt("color", Color.GRAY);f4.setArguments(bundle);transaction = manager.beginTransaction();transaction.add(R.id.frame, f1).add(R.id.frame, f2).add(R.id.frame, f3).add(R.id.frame, f4).hide(f2)        .hide(f3).hide(f4).show(f1).commit();

ok，到这里 fragment就显示出来了，然后写个方法给单选按钮的监听，根据单选按钮可以切换fragment。

private void switchFragment(MyFragment from, MyFragment to) {    if (from == to)        return;    transaction = manager.beginTransaction();    //.setCustomAnimations(R.anim.set, R.anim.setto);    transaction.hide(from).show(to).commit();    index=to;}

然后设置给监听：

rg.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {            @Override            public void onCheckedChanged(RadioGroup group, int checkedId) {                switch (checkedId) {                    case R.id.rb1:                        switchFragment(index, f1);//                        Intent intent1 = new Intent(MainActivity.this, Main2Activity.class);//                        intent1.putExtras(new Bundle());//                        startActivity(intent1);                        break;                    case R.id.rb2:                        switchFragment(index, f2);                        break;                    case R.id.rb3:                        switchFragment(index, f3);                        break;                    case R.id.rb4:                        switchFragment(index, f4);                        break;                }            }        });

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