如何将选项卡侦听器添加到选项卡

Posted 2023-04-15

【中文标题】如何将选项卡侦听器添加到选项卡

【英文标题】：How to add tab listener to the tabs

【发布时间】：2019-12-12 23:40:23

【问题描述】：

所以我想在我的应用程序中添加相机意图..但是在我的应用程序中，当您单击“打开相机”按钮时，它会打开相机，但我希望相机在我单击照片选项卡时立即出现..请有人帮助我，我将非常感激。

标签

/**
     * return the current tab number
     * 0 = Gallery_Fragment
     * 1 = Photo_Fragment
     * @return
     */
    public int getCurrentTabNumber()
        return mViewPager.getCurrentItem();
    

/**
 * setup viewpager for manager the tabs
 */
private void setupViewPager()
    SectionsPagerAdapter adapter =  new SectionsPagerAdapter(getSupportFragmentManager());
    adapter.addFragment(new GalleryFragment());
    adapter.addFragment(new PhotoFragment());

    mViewPager = (ViewPager) findViewById(R.id.container);
    mViewPager.setAdapter(adapter);

    TabLayout tabLayout = (TabLayout) findViewById(R.id.tabsBottom);
    tabLayout.setupWithViewPager(mViewPager);




    tabLayout.getTabAt(0).setText(getString(R.string.gallery));
    tabLayout.getTabAt(1).setText(getString(R.string.photo));
    tabLayout.setTabTextColors(getResources().getColor(R.color.white), getResources().getColor(R.color.white));

照片片段

公共类 PhotoFragment 扩展片段 private static final String TAG = "PhotoFragment";

//constant
private static final int PHOTO_FRAGMENT_NUM =1;
private static final int GALLERY_FRAGMENT_NUM =2;
private static final int CAMERA_REQUEST_CODE = 5;


@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) 
    View view = inflater.inflate(R.layout.fragment_photo, container, false);
    Log.d(TAG, "onCreateView: started.");

    Button btn = (Button) view.findViewById(R.id.btnLaunchCamera);
    btn.setOnClickListener(new View.OnClickListener() 
        @Override
        public void onClick(View view) 
            Log.d(TAG, "onClick: Launching Camera");

            if (((ShareActivity)getActivity()).getCurrentTabNumber()== PHOTO_FRAGMENT_NUM)
                if (((ShareActivity)getActivity()).checkPermissions(Permissions.CAMERA_PERMISSIONS[0]))
                    Log.d(TAG, "onClick: starting camera");
                    Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                    startActivityForResult(cameraIntent, CAMERA_REQUEST_CODE);

                else
                    Intent intent = new Intent (getActivity(), ShareActivity.class);
                    intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
                    startActivity(intent);

                

            
        
    );
    return view;


@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) 
    super.onActivityResult(requestCode, resultCode, data);

    if (requestCode == CAMERA_REQUEST_CODE)
        Log.d(TAG, "onActivityResult: done taking a photo.");
        Log.d(TAG, "onActivityResult: attempting to navigate tofinal share screen");
        //navigate to the final share screen to publish photo

    

【参考方案1】：

试试这个：

tabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() 
        @Override
        public void onTabSelected(TabLayout.Tab tab) 
            if (tab.getPosition() == YOUR_CAMERA_TAB_POSITION) 
               // do camera logic here
            
        

        @Override
        public void onTabUnselected(TabLayout.Tab tab) 

        

        @Override
        public void onTabReselected(TabLayout.Tab tab) 

        
    );

【讨论】：

@Harris 很高兴它做到了！快乐编码:)

【参考方案2】：

为了提高相机的速度，您可以在清单中使用以下代码

android:hardwareAccelerated="true"

对于标签监听器，你可以试试这个

 topTabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() 
        @Override
        public void onTabSelected(TabLayout.Tab tab) 

            if (tab.getPosition ==  2/*your camera tab position*/ )

            //do somthing

             

        @Override
        public void onTabUnselected(TabLayout.Tab tab) 
        @Override
        public void onTabReselected(TabLayout.Tab tab) 
    );

【讨论】：

谢谢你的朋友，如果有帮助请投我一票