private void initFragment() {
mRecommendFragment = new RecommendFragment();
mInvestFragment = new InvestFragment();
mCla***oomFragment = new Cla***oomFragment();
mMineFragment = new MineFragment();
mBaseFragments = new BaseFragment[] { mRecommendFragment,
mInvestFragment, mCla***oomFragment, mMineFragment };
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()) {
case R.id.llrecommend:
btStatuas(mRecommendFragment, 0);
switchContent(mRecommendFragment);
if(mRecommendFragment.getActivity() != null){
mRecommendFragment.NetFragment();
}
break;
case R.id.llinvest:
btStatuas(mInvestFragment, 1);
switchContent(mInvestFragment);
break;
case R.id.llcla***oom:
btStatuas(mCla***oomFragment, 2);
switchContent(mCla***oomFragment);
break;
case R.id.llmine:
if (MyApplication.getInstance().getLoginInfo() != null) {
btStatuas(mMineFragment, 3);
switchContent(mMineFragment);
if(mMineFragment.getActivity() != null){
mMineFragment.refreshTitleData();
}
} else {
Intent intent = new Intent(MainActivity.this,
LoginActivity.class);
intent.putExtra("fromact", Constant.FROM_ACT_MAIN);
startActivityForResult(intent, 0);
}
break;
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
super.onActivityResult(requestCode, resultCode, data);
switch (resultCode) {
case 1:
if (MyApplication.getInstance().getLoginInfo() == null) {
btStatuas(mCurrentContent, mCurrentLockIndex);
switchContent(mCurrentContent);
} else {
btStatuas(mMineFragment, 3);
switchContent(mMineFragment);
}
break;
case 2:
if (MyApplication.getInstance().getLoginInfo() == null) {
btStatuas(mRecommendFragment, 0);
switchContent(mRecommendFragment);
}
break;
}
}
public void switchContent(Fragment to) {
if (mContent != null && mContent != to) {
FragmentTransaction transaction = fragmentManager
.beginTransaction().setCustomAnimations(
android.R.anim.fade_in, android.R.anim.fade_out);
if (!to.isAdded()) { // 先判断是否被add过
transaction.hide(mContent).add(R.id.llfrag, to).commitAllowingStateLoss(); // 隐藏当前的fragment，add下一个到Activity中
} else {
transaction.hide(mContent).show(to).commitAllowingStateLoss(); // 隐藏当前的fragment，显示下一个
}
mContent = to;
}
}1、上面代码是多个fragment之间进行切换显示，未添加到activity中的需要add、commit，已添加的需要hide，show。
在FragmentActivity启动时，会加载在Fragment1，当Fragment1--->Activity2----->Activity3---->FragmentActivity(Fragment1)---->Fragment2，时此时Fragmnet属于未被Add入FragmentActivity中，仅仅通过new创建了实例，内部生命周期不跑，其中getActivity == null,isAdded() == false;commit并没有立即执行，而是走正常生命周期，所以不能再activity中不能调用fragment内部方法，ui未加载都为空，不能进行ui刷新。当add过后commit执行完，内部方法可以调用。
2、关于show，hiden时fragment在别的activity中fc后返回会出现fragment显示show异常
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
initView();
initClick();
initFragment();
initFragmentContent();
//版本检测
// initData();
} else {
initView();
initClick();
initFragment();
fragmentManager = getSupportFragmentManager();
FragmentTransaction beginTransaction = fragmentManager
.beginTransaction();
btStatuas(mRecommendFragment, 0);
// findViewById(R.id.llfrag)
beginTransaction.replace(R.id.llfrag, mRecommendFragment);
// beginTransaction.add(R.id.llfrag, mRecommendFragment);
mContent = mBaseFragments[0];
beginTransaction.commitAllowingStateLoss();
// Toast.makeText(MainActivity.this, "", Toast.LENGTH_SHORT).show();
}
@Override
protected void onSaveInstanceState(Bundle outState) {
// TODO Auto-generated method stub
super.onSaveInstanceState(outState);
outState.putInt("index", 0);
}onSaveInstanceState(Bundle outState)保存状态，当异常重新加载会走onCreate方法，通过保存状态的参数来判断
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