Question

我正在尝试从我的片段中创建一个Toast。我一直在互联网上搜索几个小时，我遇到的所有东西似乎都没有用。

information.setOnClickListener(new View.OnClickListener() {
                public void onClick(View v) {
                    Toast toast = Toast.makeText(getActivity().getBaseContext(), "This information will not be published in the world wide web, but will be saved on your own device instead", Toast.LENGTH_SHORT);
                    toast.show();
                    toast.setGravity(Gravity.CENTER_VERTICAL | Gravity.CENTER_HORIZONTAL, 0, 0);
                }
            });

＆＃39;的 getActivity ＆＃39;是红色的。在悬停时，它说：＆＃34; 无法解决方法＆＃39; getActivity（）＆＃39;＆＃34;。如果我删除了getActivity，并且仅使用 getBaseContext（）或 getApplicationContext（），则表示无法从静态上下文中引用非静态方法< / strong>即可。任何人都可以教我如何创建这个特定的Toast吗？

我使用了Android Studio中的标准图库标签应用程序。这是我的代码（你会在最底层找到它）：

public class ApplicationFragments extends AppCompatActivity { private SectionsPagerAdapter mSectionsPagerAdapter; private ViewPager mViewPager; //get widgets voor alle functies private static View rootView; //variable private static int section; //fragment1 static ImageButton information; static int addOneSex; static int addOneWeight; static int addOneAge; static ImageView plusSex; static ImageView plusWeight; static ImageView plusAge; static TextView sex; static TextView weight; static TextView age; //fragment2 static int addOneHour; static int addOneBeer; static int addOneWine; static int addOneShot; static ImageView plusBeers; static ImageView plusWines; static ImageView plusShots; static TextView plusHours; static TextView amountOfHours; static TextView amountOfBeers; static TextView amountOfWines; static TextView amountOfShots; //fragment3 //all fragments static Button btnNext; @Override protected void onCreate(Bundle savedInstanceState) { //verander animatie overridePendingTransition(android.R.anim.slide_in_left, android.R.anim.fade_out); super.onCreate(savedInstanceState); setContentView(R.layout.activity_information); // Create the adapter that will return a fragment for each of the three // primary sections of the activity. mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager()); // Set up the ViewPager with the sections adapter. mViewPager = (ViewPager) findViewById(R.id.container); mViewPager.setAdapter(mSectionsPagerAdapter); } public static class PlaceholderFragment extends Fragment { private static final String ARG_SECTION_NUMBER = "section_number"; public static PlaceholderFragment newInstance(int sectionNumber) { PlaceholderFragment fragment = new PlaceholderFragment(); Bundle args = new Bundle(); args.putInt(ARG_SECTION_NUMBER, sectionNumber); fragment.setArguments(args); return fragment; } //bij het creëren van een tab @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { rootView = inflater.inflate(R.layout.fragment_information, container, false); //set xml section = getArguments().getInt(ARG_SECTION_NUMBER); if (section == 1) { rootView = inflater.inflate(R.layout.fragment_information, container, false); GenerateFragment1(); } if (section == 2) { rootView = inflater.inflate(R.layout.fragment_drinks, container, false); GenerateFragment2(); } if (section == 3) { rootView = inflater.inflate(R.layout.fragment_calculate, container, false); GenerateFragment3(); } return rootView; } } //geef de juiste pagina terug public class SectionsPagerAdapter extends FragmentPagerAdapter { public SectionsPagerAdapter(FragmentManager fm) { super(fm); } @Override public Fragment getItem(int position) { return PlaceholderFragment.newInstance(position + 1); } @Override public int getCount() { //hoeveelheid pagina's return 3; } @Override public CharSequence getPageTitle(int position) { switch (position) { case 0: return "SECTION 1"; case 1: return "SECTION 2"; case 2: return "SECTION 3"; } return null; } } //fragment 1 public static void GenerateFragment1(){ information = (ImageButton) rootView.findViewById(R.id.imgBtnInfo); sex = (TextView) rootView.findViewById(R.id.etSex); weight = (TextView) rootView.findViewById(R.id.etWeight); age = (TextView) rootView.findViewById(R.id.etAge); plusSex = (ImageView) rootView.findViewById(R.id.btnSex); plusWeight = (ImageView) rootView.findViewById(R.id.btnWeight); plusAge = (ImageView) rootView.findViewById(R.id.btnAge); btnNext = (Button) rootView.findViewById(R.id.btnNext); plusSex.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { addOneSex = Integer.parseInt(sex.getText().toString()); addOneSex++; sex.setText(Integer.toString(addOneSex)); } }); plusWeight.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { addOneWeight = Integer.parseInt(weight.getText().toString()); addOneWeight++; weight.setText(Integer.toString(addOneWeight)); } }); plusAge.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { addOneAge = Integer.parseInt(age.getText().toString()); addOneAge++; age.setText(Integer.toString(addOneAge)); } }); information.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { Toast toast = Toast.makeText(getActivity().getBaseContext(), "This information will not be published in the world wide web, but will be saved on your own device instead", Toast.LENGTH_SHORT); toast.show(); toast.setGravity(Gravity.CENTER_VERTICAL | Gravity.CENTER_HORIZONTAL, 0, 0); } }); btnNext.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { //to the next fragment } }); }

另外，我想知道如何让应用程序转到按钮上的下一页（btnNext）。

感谢您的时间和帮助！

Answer 1

您是否有某个存储在活动中的片段列表或片段管理器？如果是这样，您可以从列表中获取下一个片段并使用片段管理器将其切换出来。关于toast getActivity（）问题：如果我理解正确，ApplicationFragments是你的主要活动？如果是这样，为什么不调用{{1}}而不是getActivity（）？

Android：选项卡式应用程序中的Toast＆amp;下一页点击选项卡式应用程序

1 个答案: