无法在活动中使用viewpager创建片段。

Question

I need to add a ViewPager using Fragment to a portion of my main activity which extends TabActivity . For this I have created a ViewPagerActivity class which extends FragmentActivity ,from here it adds the calls the FragmentAdapter which creates the Fragment which contains the view I want to create. But the problem that I'm facing is I cannot get my main class to create the viewpager on my main activity.

I think the problem is when I'm calling the class ViewPagerActivity on my main class,which cannot create the fragment to create the viewpager .

Please help I've been stuck in this for almost a month now , each solution I try fails. These codes run perfectly when they are implemented separately in a separate project but doesnot seems to execute when implemented in my project.

ViewPagerActivity class

class ViewPagerClass extends FragmentActivity implements OnClickListener
    {
            TestFragmentAdapter mAdapter;
            ViewPager mviewpager;
            CirclePageIndicator mIndicator;
            @Override
            protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
                mAdapter = new TestFragmentAdapter(getSupportFragmentManager());
                mviewpager = new ViewPager(getApplicationContext());
                mviewpager.setId(R.id.viewPager);
                mviewpager.setAdapter(mAdapter);
                mIndicator = (CirclePageIndicator)findViewById(R.id.indicator);
                mIndicator.setViewPager(mviewpager);
            }
            @Override
            public void onClick(DialogInterface arg0, int arg1) {
                // TODO Auto-generated method stub
            }
        }

TestFragmentAdapter.java

class TestFragmentAdapter extends FragmentPagerAdapter implements IconPagerAdapter {
    protected static final String[] CONTENT = new String[] { "This", "Is", "A", "Test"};
    protected static final int[] ICONS = new int[] {};
    private int mCount = CONTENT.length;

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

    @Override
    public Fragment getItem(int position) {
        return TestFragment.newInstance(CONTENT[position % CONTENT.length]);
    }

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

    @Override
    public CharSequence getPageTitle(int position) {
      return TestFragmentAdapter.CONTENT[position % CONTENT.length];
    }

    @Override
    public int getIconResId(int index) {
      return ICONS[index % ICONS.length];
    }

    public void setCount(int count) {
        if (count > 0 && count <= 10) {
            mCount = count;
            notifyDataSetChanged();
        }
    }

TestFragment.java

public final class TestFragment extends Fragment {
    private static final String KEY_CONTENT = "TestFragment:Content";
    static TestFragment fragment = new TestFragment();
    public static TestFragment newInstance(String content) {
        StringBuilder builder = new StringBuilder();
        builder.append(content).append("\n");
        fragment.mContent = builder.toString();
        return fragment;
    }
    private String mContent = "???";

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if ((savedInstanceState != null) && savedInstanceState.containsKey(KEY_CONTENT)) {

            mContent = savedInstanceState.getString(KEY_CONTENT);
        }
    }
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.pagerframe, container);
        LayoutParams textparam = new LayoutParams(130,40);
        TestView text = new TextView(getActivity());
        text.setText(mContent);
        text.setTextColor(Color.WHITE);
        LinearLayout layout = (LinearLayout) view.findViewById(R.id.pager_ll);
        layout.setBackgroundColor(Color.BLUE);
        layout.setVisibility(View.VISIBLE);
        layout.setGravity(Gravity.CENTER);
        layout.setOrientation(LinearLayout.VERTICAL);

        layout.addView(text,textparam);
        return layout;
    }

    @Override
    public void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putString(KEY_CONTENT, mContent);
        }
}

Answer 1

您忘记设置内容视图，因此在初始化ViewPager后再设置您的内容视图，因为View pager是您的内容视图

setContentView(mviewpager);

Answer 2

The code finally worked with few changes here and there. I'd like to add them here to help other developers with same problem as mine.

I need to add a ViewPager using Fragment to a portion of my main activity which extends TabActivity. For this I have created a ViewPagerActivity class which extends FragmentActivity ,from here it adds the calls the FragmentAdapter which creates the Fragment which contains the view I want to create. But the problem that I'm facing is I cannot get my main class to create the viewpager on my main activity.

• First I was not able to extend multiple class since i needed both Fragment and TabActivity

• I found somewhere we could extend Tab 's function also as Listener. Here's how I did it:

   public class Main extends FragmentActivity implements OnClickListener,TabContentFactory{ } 

• Then I wrote the code in my class ViewPagerActivity into the Main

• I guess this was the main problem. Anyways, I changed the code to create the Bundle in TestFragment class like this

   public static TestFragment newInstance(String content) { TestFragment fragment = new TestFragment(); Bundle args = new Bundle(); args.putString("content", content); fragment.setArguments(args); return fragment; } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // the if clause wasnot working for me mContent = getArguments().getString("content"); } 

  • Changed to onCreate to return view rather than the layout which I was missing earlier

     @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.pagerframe, container,false); LayoutParams textparam = new LayoutParams(LayoutParams.FILL_PARENT,30); TestView text = new TextView(getActivity()); text.setText(mContent); text.setTextColor(Color.WHITE); LinearLayout layout = (LinearLayout) view.findViewById(R.id.pager_ll); layout.setVisibility(View.VISIBLE); layout.setGravity(Gravity.CENTER); layout.setOrientation(LinearLayout.VERTICAL); layout.addView(edtext,textparam); return view; } 

  • After this everything worked well.