Tab片段-Tab随片段边按钮动作改变

问题描述：

我正在用TabsPagerAdapter处理ViewPager，我已成功创建了两个选项卡，如a和b。我的按钮被放置在一个标签，如果我点击按钮，它必须b选项卡。Tab片段-Tab随片段边按钮动作改变

主要活动是 -

private ViewPager viewPager; 
private TabsPagerAdapter mAdapter; 
private ActionBar actionBar; 
// Tab titles 
private String[] tabs = { "Top Rated", "Games" }; 

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

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

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

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

    /** 
    * on swiping the viewpager make respective tab selected 
    * */ 
    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) { 
     } 
    }); 
} 

@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) { 
}}

Tabpageadaper是 -

public class TabsPagerAdapter extends FragmentPagerAdapter { 

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

@Override 
public Fragment getItem(int index) { 

    switch (index) { 
    case 0: 
     // Top Rated fragment activity 
     return new TopRatedFragment(); 
    case 1: 
     // Games fragment activity 
     return new GamesFragment(); 
    case 2: 
     // Movies fragment activity 
     return new MoviesFragment(); 
    } 

    return null; 
} 

@Override 
public int getCount() { 
    // get item count - equal to number of tabs 
    return 3; 
}

}

我的按钮被置于顶级标签，如下所示 -

public class TopRatedFragment extends Fragment { 
private int currentPage; 
@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
         Bundle savedInstanceState) { 

    View rootView = inflater.inflate(R.layout.fragment_top_rated, container, false); 
    Button b1=(Button)rootView.findViewById(R.id.button); 
    b1.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
     } 
    }); 
    return rootView; 
}

}

当我点击上面的按钮它必须打开游戏tab.Thanks提前。

答

您可以使用viewPager.setCurrentItem(position);选择viewPager目标页面

所以把这个方法在你Activity

public void chooseTab(int position){ 
    viewPager.setCurrentItem(position); 
}

，然后你可以从任何片段这样

((MainActivity) getActivity()).chooseTab(0)

调用它只是通过目标标签位置

答

在您的MainActivity添加一个公共方法 -

public void selectFragment(int position){ 
    viewPager.setCurrentItem(position, true); 
    // true is to animate the transaction 
}

那么你TopRatedFragment b1.setOnClickListener组下面这段代码 -

((MainActivity)getActivity()).selectFragment(1); //1 is second position

答

要更改Tab/Fragment可以使用viewPager.setCurrentItem()方法。

在MainActivity.java写public方法如下图所示：

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

    ................ 
    ........................ 
} 

public void selectTab(int position) { 
    viewPager.setCurrentItem(position); 
}

使用selectTab()从TopRatedFragment.java选择GamesFragment方法。

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
        Bundle savedInstanceState) { 

    View rootView = inflater.inflate(R.layout.fragment_top_rated, container, false); 
    Button b1=(Button)rootView.findViewById(R.id.button); 
    b1.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      ((MainActivity)getActivity()).selectTab(1); // 1 for GamesFragment 
     } 
    }); 

    return rootView; 
}

Tab片段-Tab随片段边按钮动作改变

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