从库项目调用方法时，Android应用程序强制关闭

Question

我正在使用Android。我创建了一个库项目，其onCreate（）显示了一个弹出操作栏选项卡。当我试图将它集成到其他项目并访问库项目中的方法时，它会强制关闭。知道我做错了什么吗？

这是我的代码

MainActivity1（图书馆项目）

public class MainActivity1 extends FragmentActivity implements ActionBar.TabListener {

    private ViewPager viewPager;
    private TabsPagerAdapter mAdapter;
    private ActionBar actionBar;
    // Tab titles
    private String[] tabs = { "Featured", "Games", "Entertainment" };
    private static String App_id;

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

        pop("123");
    }

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

    @Override
    public void onTabSelected(Tab tab, FragmentTransaction ft) {
        // on tab selected
        // show respected fragment view
        viewPager.setCurrentItem(tab.getPosition());
    }

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

    public void pop(String App_id) {
        MainActivity1.App_id=App_id;
        requestWindowFeature(Window.FEATURE_ACTION_BAR);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_DIM_BEHIND, WindowManager.LayoutParams.FLAG_DIM_BEHIND);

        LayoutParams params =getWindow().getAttributes(); 
        params.alpha = 1.0f;
        params.dimAmount = 0.5f;
        getWindow().setAttributes((android.view.WindowManager.LayoutParams) params); 

        // This sets the window size, while working around 
        // the IllegalStateException thrown by ActionBarView
        getWindow().setLayout(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);

        setContentView(R.layout.activity_main);

        viewPager = (ViewPager) findViewById(R.id.pager);
        actionBar = getActionBar();
        mAdapter = new TabsPagerAdapter(getSupportFragmentManager());

        viewPager.setAdapter(mAdapter);
        actionBar.setHomeButtonEnabled(false);
        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);        

        // Adding Tabs
        for (String tab_name : tabs) {
            actionBar.addTab(actionBar.newTab().setText(tab_name).setTabListener(this));
        }

        viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            @Override
            public void onPageSelected(int position) {
                // on changing the page
                // make respected tab selected
                actionBar.setSelectedNavigationItem(position);
            }

            @Override
            public void onPageScrolled(int arg0, float arg1, int arg2) {
            }

            @Override
            public void onPageScrollStateChanged(int arg0) {
            }
        });
    }
}

MainActivity（其他项目）

public class MainActivity extends Activity {    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main1);
        Button b1=(Button)findViewById(R.id.button1);

        b1.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {

                MainActivity1 asd=new MainActivity1();
                asd.pop("123");
            }
        });
    }
}