Question

我在以下的层次结构中有可滑动的片段：

我用它来介绍用户应用程序及其功能。但是，当我运行应用程序时，片段不会以正确的顺序呈现（welcome1 - ＆gt; welcome2 - ＆gt; welcome3等）。相反，当向右滑动时，它会显示“welcome2，welcome 2，welcome 3，welcome 4”。当我向左滑动时，订单再次搞砸了，每次都显示“welcome4”。我的代码如下：

IntroActivity类：

public class IntroActivity extends AppCompatActivity {

private SectionsPagerAdapter mSectionsPagerAdapter;
private ViewPager mViewPager;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_feature);

    mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());

    mViewPager = (ViewPager) findViewById(R.id.container);
    mViewPager.setAdapter(mSectionsPagerAdapter);

}

public class SectionsPagerAdapter extends FragmentPagerAdapter {

    public SectionsPagerAdapter(FragmentManager fm) {
        super(fm);
    }

    @Override
    public Fragment getItem(int position) {

        if (position == 0) {

            Log.e("---","Position 0");
            return WelcomeFragment.newInstance("testtitle#1",R.layout.fragment_welcome_one,R.id.welcome1);

        }else if (position == 1){

            Log.e("---","Position 1");
            return WelcomeFragment.newInstance("testtitle#2", R.layout.fragment_welcome_two, R.id.welcome2);

        }else if (position == 2){

            Log.e("---","Position 2");
            return WelcomeFragment.newInstance("testtitle#3", R.layout.fragment_welcome_three, R.id.welcome3);

        }else if (position == 3){

            Log.e("---","Position 3");
            return WelcomeFragment.newInstance("testtitle#4", R.layout.fragment_welcome_four, R.id.welcome4);

        }

        return null;
    }

    @Override
    public int getCount() {
        return 4;
    }

    }
}

WelcomeFragment类：

public class WelcomeFragment extends Fragment {

static String mTitle;
static int mLayoutID;
static int mTitleID;

public WelcomeFragment() {
}

public static WelcomeFragment newInstance(String title, int layoutID, int titleID) {

    WelcomeFragment mWelcomeFragment = new WelcomeFragment();

    mTitle = title;
    mLayoutID = layoutID;
    mTitleID = titleID;

    return mWelcomeFragment;
}

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

    View rootView = inflater.inflate(mLayoutID,container,false);
    TextView textView = (TextView)rootView.findViewById(mTitleID);
    Typeface font = Typeface.createFromAsset(getActivity().getAssets(), "fonts/Roboto-Thin.ttf");
    textView.setText(mTitle);
    textView.setTypeface(font);

    return rootView;
    }
}

我无法确定导致我的碎片绘制错误的原因，任何帮助都表示赞赏。

Answer 1

您的newInstance方法以及静态成员变量不正确。

使变量成为私有而非静态

private String mTitle;
private int mLayoutID;
private int mTitleID;

并将newInstance方法更改为

public static WelcomeFragment newInstance(String title, int layoutID, int titleID) {
    WelcomeFragment mWelcomeFragment = new WelcomeFragment();

    mWelcomeFragment.mTitle = title;
    mWelcomeFragment.mLayoutID = layoutID;
    mWelcomeFragment.mTitleID = titleID;

    return mWelcomeFragment;
}

考虑查看my tutorial以获取有关使用视图寻呼机的深入说明以及GitHub上的工作示例。

可滑动的片段未按正确顺序显示

1 个答案: