我如何使用ViewPager显示相同的片段，但每次加载不同的数据?

Question

我试图设置一个ViewPager来显示相同的模板片段，但在每次滑动后填充不同的数据。我在这里使用虚拟数据，但我的问题是，每次滑动后加载相同的数据。我到底做错了什么?

下面是我的代码: 测试:

public class Test {
private String a;
private String b;
private int c;
public Test(String a, String b, int c) {
this.a = a;
this.b = b;
this.c = c;
}
public static final Test[] testData = {
new Test("Title 1", "Description 1", 1),
new Test("Title 2", "Description 2", 2),
new Test("Title 3", "Description 3", 3),
new Test("Title 4", "Description 4", 4),
new Test("Title 5", "Description 5", 5)
};
public String getA() {
return a;
}
public String getB() {
return b;
}
public int getC() {
return c;
}
}

TestFragment:

public class TestFragment extends Fragment {
private static final String ARG_ID = "Id";
private int Id;
private String a;
private TextView aTV;
private String b;
private TextView bTV;
private int c;
private TextView cTV;
public static TestFragment newInstance(int Id) {
Bundle args = new Bundle();
args.putSerializable(ARG_ID, Id);
TestFragment fragment = new TestFragment();
fragment.setArguments(args);
return fragment;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_test, container, false);
Id = (Integer) getActivity().getIntent().getExtras().get(EXTRA_ID);
a = Test.testData[Id].getA();
b = Test.testData[Id].getB();
c = Test.testData[Id].getC();
aTV = (TextView) view.findViewById(R.id.a);
aTV.setText(a);
bTV = (TextView) view.findViewById(R.id.b);
bTV.setText(b);
cTV = (TextView) view.findViewById(R.id.c);
cTV.setText(String.valueOf(c));
return view;
}
}

ViewPagerActivity:

public class ViewPagerActivity extends AppCompatActivity {
private ViewPager viewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_view_pager);
viewPager = (ViewPager) findViewById(R.id.view_pager);
FragmentManager fragmentManager = getSupportFragmentManager();
viewPager.setAdapter(new FragmentStatePagerAdapter(fragmentManager) {
@Override
public Fragment getItem(int position) {
return TestFragment.newInstance(position);
}
@Override
public int getCount() {
return 5;
}
});
}
}

Answer 1

您没有获得TestFragment的片段参数，其中您有Id变量，但相反，您试图从Intent Extras获取数据:

Id = (Integer) getActivity().getIntent().getExtras().get(EXTRA_ID);

您应该通过以下方式获得您在TestFragment的newInstance方法中提供的参数:

Id = getArguments().getInt(ARG_ID);