Erreur: erreur (69, 20): la méthode onCreate (Bundle) est déjà définie dans la classe MainActivity

Question

Je crée une application simple. Je rencontre un problème pour finaliser l'application.

J'essaie onclick image WebView dans la vue par onglets.

Cependant, seul le premier bouton ouvre le scanner. Le deuxième bouton ne fait rien.

Ceci est mon code actuel de 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

Votre MainActivity supprimer ci-dessous la méthode

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

} 

Remarque: Vous ne pouvez pas utiliser la même méthode avec les mêmes arguments dans une seule classe. Vous pouvez utiliser la méthode ci-dessous si vos activités ont créé l'attribut 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

Vous avez 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(); 

} 

Retirez la méthode click() et ajouter dans onCreate() principale:

SUPPRIMER TOUS:

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

}