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我在我的项目中使用此页面中的库：https ://code.google.com/p/android-flowtextview/

正如您在我的代码中的 setText 方法中看到的那样，它运行代码来设置视图的文本。但是当我在手机上运行该应用程序时，它会崩溃，并显示 NullPointerException

有谁知道如何使它正常工作？谢谢。（我也有片段的单独类文件，第一个的代码在主代码下面。

主要代码：

package com.cw1998.app.ref;

import java.util.ArrayList;

import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.view.ViewPager;
import android.widget.TextView;

import com.actionbarsherlock.app.ActionBar;
import com.actionbarsherlock.app.SherlockFragmentActivity;
import com.actionbarsherlock.app.ActionBar.Tab;
import com.pagesuite.flowtext.FlowTextView;

public class Faction extends SherlockFragmentActivity {

    ViewPager mViewPager;
    TabsAdapter mTabsAdapter;
    TextView tabCenter;
    TextView tabText;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        mViewPager = new ViewPager(this);
        mViewPager.setId(R.id.pager);

        setContentView(mViewPager);
        ActionBar bar = getSupportActionBar();
        bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

        mTabsAdapter = new TabsAdapter(this, mViewPager);

        mTabsAdapter.addTab(bar.newTab().setText("Fragment 1dsa"),
                Faction_tab_1.class, null);
        mTabsAdapter.addTab(bar.newTab().setText("Fragment 2sad"),
                Faction_tab_2.class, null);
        setText();
    }

    public static class TabsAdapter extends FragmentPagerAdapter implements
            ActionBar.TabListener, ViewPager.OnPageChangeListener {
        private final Context mContext;
        private final ActionBar mActionBar;
        private final ViewPager mViewPager;
        private final ArrayList<TabInfo> mTabs = new ArrayList<TabInfo>();

        static final class TabInfo {
            private final Class<?> clss;
            private final Bundle args;

            TabInfo(Class<?> _class, Bundle _args) {
                clss = _class;
                args = _args;
            }
        }

        public TabsAdapter(SherlockFragmentActivity activity, ViewPager pager) {
            super(activity.getSupportFragmentManager());
            mContext = activity;
            mActionBar = activity.getSupportActionBar();
            mViewPager = pager;
            mViewPager.setAdapter(this);
            mViewPager.setOnPageChangeListener(this);
        }

        public void addTab(ActionBar.Tab tab, Class<?> clss, Bundle args) {
            TabInfo info = new TabInfo(clss, args);
            tab.setTag(info);
            tab.setTabListener(this);
            mTabs.add(info);
            mActionBar.addTab(tab);
            notifyDataSetChanged();
        }

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

        @Override
        public Fragment getItem(int position) {
            TabInfo info = mTabs.get(position);
            return Fragment.instantiate(mContext, info.clss.getName(),
                    info.args);
        }

        public void onPageScrolled(int position, float positionOffset,
                int positionOffsetPixels) {
        }

        public void onPageSelected(int position) {
            mActionBar.setSelectedNavigationItem(position);
        }

        public void onPageScrollStateChanged(int state) {
        }

        public void onTabSelected(Tab tab, FragmentTransaction ft) {
            Object tag = tab.getTag();
            for (int i = 0; i < mTabs.size(); i++) {
                if (mTabs.get(i) == tag) {
                    mViewPager.setCurrentItem(i);
                }
            }
        }

        public void onTabUnselected(Tab tab, FragmentTransaction ft) {
        }

        public void onTabReselected(Tab tab, FragmentTransaction ft) {
        }
    }

    public void setText() {
        FlowTextView tv;
        tv = (FlowTextView) findViewById(R.id.tab_1_text);
        tv.setText("Testing"); // using plain text
        tv.invalidate(); // call this to render the text
    }
}

片段类代码：

package com.cw1998.app.ref;

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.actionbarsherlock.app.SherlockFragment;

public class Faction_tab_1 extends SherlockFragment
{

  @Override
 public View onCreateView(LayoutInflater inflater, ViewGroup container,
   Bundle savedInstanceState)
 {
  View view = inflater.inflate(R.layout.faction_grineer_enemies, container, false);

  return view;
 }

}
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