Question

android 改变系统字体 界面切换问题

主界面使用FragmentManager，FragmentTransaction和底部RadioGroup来控制界面切换，在app后台运行状态下，改变系统字体，这时再点击底部按钮，fragment不切换，这是为啥，怎么处理？
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
fragmentTransaction = fragmentManager.beginTransaction();
switch (checkedId){
case R.id.btn_share_main:
hideFragment(fragmentTransaction);
if (shareFragment != null) {
fragmentTransaction.show(shareFragment);
}else{
shareFragment = new ShareFragment();
fragmentTransaction.add(R.id.main_container, shareFragment);
}
break;
case R.id.btn_school_main:
hideFragment(fragmentTransaction);
if (schoolFragment != null) {
fragmentTransaction.show(schoolFragment);
}else{
schoolFragment = new SchoolFragment();
fragmentTransaction.add(R.id.main_container, schoolFragment);
}
break;
case R.id.btn_personal_main:
hideFragment(fragmentTransaction);
if (personalFragment != null) {
fragmentTransaction.show(personalFragment);
}else{
personalFragment = new PersonalFragment();
fragmentTransaction.add(R.id.main_container, personalFragment);
}
break;
}
fragmentTransaction.commit();
}

Answer 1

1.无参数Activity跳转

Intent it = new Intent(Activity.Main.this, Activity2.class);
startActivity(it);

2.向下一个Activity传递数据（使用Bundle和Intent.putExtras）

Intent it = new Intent(Activity.Main.this, Activity2.class);
Bundle bundle=new Bundle();
bundle.putString("name", "This is from MainActivity!");
it.putExtras(bundle); // it.putExtra(“test”, "shuju”);
startActivity(it); // startActivityForResult(it,REQUEST_CODE);

对于数据的获取可以采用：

Bundle bundle=getIntent().getExtras();
String name=bundle.getString("name");

3.向上一个Activity返回结果（使用setResult，针对startActivityForResult(it,REQUEST_CODE)启动的Activity）

Intent intent=getIntent();
Bundle bundle2=new Bundle();
bundle2.putString("name", "This is from ShowMsg!");
intent.putExtras(bundle2);
setResult(RESULT_OK, intent);

4.回调上一个Activity的结果处理函数（onActivityResult）

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
super.onActivityResult(requestCode, resultCode, data);
if (requestCode==REQUEST_CODE){
if(resultCode==RESULT_CANCELED)
setTitle("cancle");
else if (resultCode==RESULT_OK) {
String temp=null;
Bundle bundle=data.getExtras();
if(bundle!=null) temp=bundle.getString("name");
setTitle(temp);
}
}
}