Question

我的主要活动：

 public class MainActivity extends FragmentActivity implements ActionBar.TabListener {
    private ViewPager viewPager;
    private ActionBar actionBar;
    private TabsFragmentPagerAdapter tabsAdapter;
    private String[] days = new String[]{"Monday","Tuesday"};
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        viewPager = (ViewPager) findViewById(R.id.viewPager);
        tabsAdapter = new TabsFragmentPagerAdapter(getSupportFragmentManager());
        viewPager.setAdapter(tabsAdapter);
        actionBar = getActionBar();
        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
        for(int i=0; i<3; i++){
            actionBar.addTab(actionBar.newTab().setText(days[i]).setTabListener(this));
        }
        viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {

            @Override
            public void onPageSelected(int arg) {
                // TODO Auto-generated method stub
                actionBar.setSelectedNavigationItem(arg);
            }

            @Override
            public void onPageScrolled(int arg0, float arg1, int arg2) {
                // TODO Auto-generated method stub

            }

            @Override
            public void onPageScrollStateChanged(int arg0) {
                // TODO Auto-generated method stub

            }
        });

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public void onTabReselected(Tab arg0, FragmentTransaction arg1) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onTabSelected(Tab tab, FragmentTransaction arg1) {
        // TODO Auto-generated method stub
        viewPager.setCurrentItem(tab.getPosition());
    }

    @Override
    public void onTabUnselected(Tab arg0, FragmentTransaction arg1) {
        // TODO Auto-generated method stub
}

我的清单：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.muhammad_taha.tablelayout" >

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

我的下一个代码：

 public class MondayFragment extends Fragment {
        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                                 Bundle savedInstanceState) {
            // TODO Auto-generated method stub
            View view = inflater.inflate(R.layout.fragment_monday, container, false);
            return view;
        }

    }

下一个：

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class TuesdayFragment extends Fragment {
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        View view = inflater.inflate(R.layout.fragment_tuesday, container, false);
        return view;
    }

}

对于堆栈跟踪排序：

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;

public class TabsFragmentPagerAdapter extends FragmentPagerAdapter {

    public TabsFragmentPagerAdapter(FragmentManager fm) {
        super(fm);
        // TODO Auto-generated constructor stub
    }

    @Override
    public Fragment getItem(int index) {
        // TODO Auto-generated method stub
        if(index == 0)
            return new MondayFragment();
        if(index == 1)
            return new TuesdayFragment();


        return null;
    }

    @Override
    public int getCount() {
        // TODO Auto-generated method stub
        return 3;
    }

}

我的xml文件显示第一页：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:background="#00fff8" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:text="Monday"
        android:textSize="40dp"
        android:gravity="center" />

</LinearLayout>

我的xml文件显示第二个标签：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:background="#59ff85" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:text="Tuesday"
        android:textSize="40dp"
        android:gravity="center" />

</LinearLayout>

最后我想告诉你我从3天开始坚持到底。请更正此代码。＆＃34; TabListener＆＃34;界面不可用。但是忽略它并在几毫秒后运行我的应用程序然后bhoooo＆＃34;不幸的是你的应用程序已停止工作＆＃34; ............ 请帮助我.....并为我编写正确的代码..........现在大脑已经完成.........我完成了。我真的不知道后端会发生什么。我想帮助解决这个问题。如果我知道什么是问题，我可能会自己解决。如果你知道解决方案，我需要帮助来发现问题。如果你需要一些其他文件告诉我，我将加载它。但请帮助我。

Answer 1

您的getCount实施错误。 getItem是从0开始的，当position是2时，它返回null，但是它不能返回null。变化

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

到

@Override
public int getCount() {
    return 2;
}

我的应用程序已停止工作？

1 个答案: