Question

如何在使用Views时从我自己的方法访问layout Fragments？我在View设置了Fragment，如下所示：

public class LeftSectionFragment extends Fragment {
     public View onCreateView(LayoutInflater inflater, ViewGroup container,
                Bundle savedInstanceState) {
            final View rootView = inflater.inflate(R.layout.left, container, false);

            TextView whatever = (TextView) rootView.findViewById(R.id.whateverR);

            return rootView;
        }
    }

如何访问此whatever TextView字段，以便我可以使用自己的方法在那里写下一些内容？就像whatever.setText()一样，但我无法使用它，因为我不知道如何从Fragment之外引用它。

编辑：我的方法（它不在LeftSectionFragment内！），我想引用TextView的内容如下所示：

    private void print(String msg) {
    String s = msg;
    inc = s.split(",");
    incLength = inc.length;

    //here refer to whatever TextView, similiary to whatever.setText(inc[0])
}

EDIT2：首次提出片段的主onCreate方法：

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main_activity);

    final ActionBar actionBar = getActionBar();
    actionBar.setHomeButtonEnabled(false);
    actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
    mAppSectionsPagerAdapter = new AppSectionsPagerAdapter(getSupportFragmentManager());        


    mViewPager = (CustomViewPager) findViewById(R.id.pager);

    mViewPager.setAdapter(mAppSectionsPagerAdapter);

    mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
        @Override
        public void onPageSelected(int position) {
            actionBar.setSelectedNavigationItem(position);
        }
    });


    for (int i = 0; i < mAppSectionsPagerAdapter.getCount(); i++) {
        actionBar.addTab(
                actionBar.newTab()
                        .setText(mAppSectionsPagerAdapter.getPageTitle(i))
                        .setTabListener(this));
    }

    mViewPager.setCurrentItem(1);

}

FragmentPagerAdapter：

public class AppSectionsPagerAdapter extends FragmentPagerAdapter {

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

        @Override
        public Fragment getItem(int i) {
            switch (i) {
            case 0:
                return new LeftSectionFragment();

            case 1:
                return new MiddleSectionFragment();

            case 2:
                return new RightSectionFragment();

            default:
                return new MiddleSectionFragment();
            }
        }

        @Override
        public int getCount() {
            return 3;
        }

        @Override
        public CharSequence getPageTitle(int position) {
            int pos = position;
            switch (pos) {
            case 0:
                return "Left";
            case 1:
                return "Middle";
            case 2:
                return "Right";
            default:
                return "Middle";
            }
        }
    }

标签：

@Override
public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
    }

    @Override
public void onTabSelected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
        // When the given tab is selected, switch to the corresponding page in the ViewPager.
        mViewPager.setCurrentItem(tab.getPosition());
    }

    @Override
public void onTabReselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
    }

EDIT3：提出print的地方：

private final Handler mHandler = new Handler() {
    @Override
    public void handleMessage(Message msg) {
        switch (msg.what) {
            case MESSAGE_READ:
            byte[] readBuf = (byte[]) msg.obj;
            // construct a string from the valid bytes in the buffer
            readMessage = new String(readBuf, 0, msg.arg1);
            mConversationArrayAdapter.add(mConnectedDeviceName+":  " + readMessage);
            print(readMessage);
            break;

Answer 1

我不知道我的问题是否正确，但我认为你想要这样的事情：

public class LeftSectionFragment extends Fragment {

    private TextView mWhatever;

    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        final View rootView = inflater.inflate(R.layout.left, container, false);

        mWhatever = (TextView) rootView.findViewById(R.id.whateverR);

        return rootView;
    }

    public void setWhateverText(String text) {
        mWhateverText.setText(text);
    }
}

在您的活动中，请按以下方式访问：

{
    // init your Fragment
    LeftSectionFragment leftFragment = LeftSectionFragment.initiate(); 
}


private void print(String msg) {
    String s = msg;
    inc = s.split(",");
    incLength = inc.length;

    //here refer to whatever TextView, similiary to whatever.setText(inc[0])
    leftFragment.setWhateverText(incLength);
}

Answer 2

答案是：

private void print(String msg) {
    String s = msg;
    inc = s.split(",");
    incLength = inc.length;
    LeftSectionFragment.set(inc[0]);
    for(int i = 0; i < incLength; i++)
        Log.i("taguś",inc[i]);
}

在这里，我们只是引用我们有方法的LeftSectionFragment：

public static void set(String text) {
    valuefixInd.setText(text);
}

这一切都很好。重要的是将我们的Fragment类，TextView字段和set方法定义为静态：private static TextView whatever＆amp; public static class LeftSectionFragment extends Fragment＆amp; public static void set。

使用片段时参考方法视图

2 个答案: