Ошибка: (69, 20) error: метод onCreate (Bundle) уже определен в классе MainActivity

Question

Я создаю простое приложение. У меня есть одна проблема, чтобы завершить приложение.

Я пытаюсь onclick изображение WebView в виде вкладок.

Однако только первая кнопка открывает сканер. Вторая кнопка ничего не делает.

Это мой текущий код из MainActivity.java:

package in.radioactiveenterprise.watchout; 

import android.content.Intent; 

import android.support.design.widget.TabLayout; 

import android.support.v7.app.AppCompatActivity; 
import android.support.v7.widget.Toolbar; 

import android.support.v4.app.Fragment; 
import android.support.v4.app.FragmentManager; 
import android.support.v4.app.FragmentPagerAdapter; 
import android.support.v4.view.ViewPager; 
import android.os.Bundle; 
import android.view.LayoutInflater; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.view.View; 
import android.view.ViewGroup; 

import android.widget.ImageView; 
import android.widget.TextView; 



public class MainActivity extends AppCompatActivity { 



    /** 
    * The {@link android.support.v4.view.PagerAdapter} that will provide 
    * fragments for each of the sections. We use a 
    * {@link FragmentPagerAdapter} derivative, which will keep every 
    * loaded fragment in memory. If this becomes too memory intensive, it 
    * may be best to switch to a 
    * {@link android.support.v4.app.FragmentStatePagerAdapter}. 
    */ 
    private SectionsPagerAdapter mSectionsPagerAdapter; 

    /** 
    * The {@link ViewPager} that will host the section contents. 
    */ 
    private ViewPager mViewPager; 



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

     Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
     setSupportActionBar(toolbar); 
     // 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); 

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

    } 

    private static ImageView img; 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     click(); 

    } 
    public void click() 
    { 
     img = (ImageView)findViewById(R.id.imageViewz); 
     img.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v){ 
       Intent intent = new Intent("in.radioactiveenterprise.watchoutt1.Main2Activity"); 
       startActivity(intent); 

      } 
     }); 
    }; 

    @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 boolean onOptionsItemSelected(MenuItem item) { 
     // Handle action bar item clicks here. The action bar will 
     // automatically handle clicks on the Home/Up button, so long 
     // as you specify a parent activity in AndroidManifest.xml. 
     int id = item.getItemId(); 

     //noinspection SimplifiableIfStatement 
     if (id == R.id.action_settings) { 
      return true; 
     } 

     return super.onOptionsItemSelected(item); 
    } 

    /** 
    * A placeholder fragment containing a simple view. 
    */ 
    public static class PlaceholderFragment extends Fragment { 
     /** 
     * The fragment argument representing the section number for this 
     * fragment. 
     */ 
     private static final String ARG_SECTION_NUMBER = "section_number"; 

     public PlaceholderFragment() { 
     } 

     /** 
     * Returns a new instance of this fragment for the given 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; 
     } 

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

      if (getArguments().getInt(ARG_SECTION_NUMBER) == 1) 
      { 
       View rootView = inflater.inflate(R.layout.fragment_sub_page01, container, false); 
       return rootView; 
      } 
      else if (getArguments().getInt(ARG_SECTION_NUMBER) == 2) 
      { 
       View rootView = inflater.inflate(R.layout.fragment_sub_page02, container, false); 
       return rootView; 
      } 
      else 
      { 
       View rootView = inflater.inflate(R.layout.fragment_main, container, false); 
       TextView textView = (TextView) rootView.findViewById(R.id.section_label); 
       textView.setText(getString(R.string.section_format, getArguments().getInt(ARG_SECTION_NUMBER))); 
       return rootView; 
      } 
     } 
    } 
    /** 
    * A {@link FragmentPagerAdapter} that returns a fragment corresponding to 
    * one of the sections/tabs/pages. 
    */ 
    public class SectionsPagerAdapter extends FragmentPagerAdapter { 

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

     @Override 
     public Fragment getItem(int position) { 
      // getItem is called to instantiate the fragment for the given page. 
      // Return a PlaceholderFragment (defined as a static inner class below). 
      return PlaceholderFragment.newInstance(position + 3); 
     } 

     @Override 
     public int getCount() { 
      // Show 3 total pages. 
      return 3; 
     } 

     @Override 
     public CharSequence getPageTitle(int position) { 
      switch (position) { 
       case 0: 
        return "FASTBOOK"; 
       case 1: 
        return "TIMELINE"; 
       case 2: 
        return "FARMBOOK"; 
      } 
      return null; 
     } 
    } 
} 

Answer 1

В Ваш MainActivity удалить ниже метод

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    click(); // add this into your Primary onCreate method. 

} 

Примечание: Вы не можете использовать тот же метод с теми же аргументами в одном классе.

вы можете использовать следующий метод, если ваши действия созданы с помощью атрибута android.R.attr.persistableMode.

Same as onCreate(Bundle) but called for those activities created with the attribute android.R.attr.persistableMode set to persistAcrossReboots.

persistentState - if the activity is being re-initialized after previously being shut down or powered off then this Bundle contains the data it most recently supplied to outPersistentState in onSaveInstanceState. Note: Otherwise it is null.

@Override 
public void onCreate(Bundle savedInstanceState, PersistableBundle persistentState) { 
    super.onCreate(savedInstanceState, persistentState); 
} 

Answer 2

У вас есть 2 onCreate():

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

    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
    setSupportActionBar(toolbar); 
    // 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); 

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

    click(); 

} 

Удалить метод click() и добавить в основную onCreate():

УДАЛИТЬ ВСЕ:

private static ImageView img; 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    click(); //add this on onCreate 

}