Fragment

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//会变的图片

</selector>

//主方法

public class Activity_fragment extends AppCompatActivity implements RadioGroup.OnCheckedChangeListener {
private FragmentManager fm;
private RadioGroup rg1;
private RadioButton [] rbarray;
private ArrayList<Fragment> fragmentArrayList;
private int count=0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_activity_fragment);
initview();
}
private void initview() {
rg1= (RadioGroup) findViewById(R.id.rg2);
rbarray=new RadioButton[rg1.getChildCount()];
for (int i = 0; i <rbarray.length ; i++) {
rbarray[i]= (RadioButton) rg1.getChildAt(i);
}

fragmentArrayList=new ArrayList<Fragment>();

Fragment1_a f1=new Fragment1_a();
fragmentArrayList.add(new Fragment1_a());
Fragment1_b f2=new Fragment1_b();
fragmentArrayList.add(new Fragment1_b());
Fragment1_c f3=new Fragment1_c();
fragmentArrayList.add(new Fragment1_c());
Fragment1_d f4=new Fragment1_d();
fragmentArrayList.add(new Fragment1_d());

fm=getSupportFragmentManager();
FragmentTransaction tt = fm.beginTransaction();
tt.add(R.id.fl2,fragmentArrayList.get(0));
rbarray[0].setChecked(true);
rg1.setOnCheckedChangeListener(this);
}

@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
FragmentTransaction tt = fm.beginTransaction();
for (int i = 0; i <rbarray.length ; i++) {
if (rbarray[i].getId()==checkedId){
if (fragmentArrayList.get(i).isAdded()){
tt.show(fragmentArrayList.get(i)).hide(fragmentArrayList.get(count)).commit();
}else {
tt.add(R.id.fl2,fragmentArrayList.get(i)).hide(fragmentArrayList.get(count)).commit();
}
count=i;
}
}
}
}

//右键创建Fragment

import com.example.administrator.android_2_weekend2import.R;

/**
* A simple {@link Fragment} subclass.
*/
public class Fragment_1 extends Fragment {

public Fragment_1() {
// Required empty public constructor
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View v=inflater.inflate(R.layout.fragment_fragment_1, container, false);
return v;
}

}

//可能是viewpager的适配器

public class MyAdapterpager extends PagerAdapter{
private ArrayList<View> list;

public MyAdapterpager(ArrayList<View> list) {
this.list = list;
}

@Override
public int getCount() {
return list.size();
}

@Override
public boolean isViewFromObject(View view, Object object) {
return view==object;
}

@Override
public Object instantiateItem(ViewGroup container, int position) {
View view=list.get(position);
container.addView(view);
return view;
}

@Override
public void destroyItem(ViewGroup container, int position, Object object) {
View view=list.get(position);
container.removeView(view);
}
}

//中的布局

F中只有一个textview

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