विधि को हल नहीं किया जा सकता 'जोड़ने (पूर्णांक, com.example.utkarsh.beatle.app.MainActivity.PlaceholderFragment)

Question

package com.example.utkarsh.beatle.app; 

import android.app.Fragment; 
import android.os.Bundle; 
import android.support.v4.app.FragmentActivity; 
import android.view.LayoutInflater; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.ArrayAdapter; 
import android.widget.ListView; 

import java.util.ArrayList; 
import java.util.Arrays; 
import java.util.List; 


public class MainActivity extends FragmentActivity { 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    if(savedInstanceState==null) 
    { 
     getSupportFragmentManager().beginTransaction().add(R.id.container, new PlaceholderFragment()).commit(); 
    } 
} 


@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); 
} 

public static class PlaceholderFragment extends Fragment { 

    private ArrayAdapter<String> mForecastAdapter; 


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

     View rootView = inflater.inflate(R.layout.fragment_main, container, false); 
     String[] forecastArray = {"Today-Sunny-88/63", "Tommorrow-windy-88/94", "wed-aloo-alooo"}; 
     List<String> weekForecast = new ArrayList<String>(Arrays.asList(forecastArray)); 
     mForecastAdapter = new ArrayAdapter<String>(getActivity(), R.layout.fragment_main, R.id.list_item_forecast_textview, weekForecast); 
     ListView listView = (ListView) rootView.findViewById(R.id.list_view_forecast); 
     listView.setAdapter(mForecastAdapter); 
     return rootView; 

    } 
}} 

Messages Gradle Build Error:(27, 59) error: no suitable method found for add(int,PlaceholderFragment) method FragmentTransaction.add(Fragment,String) is not applicable (argument mismatch; int cannot be converted to Fragment) method FragmentTransaction.add(int,Fragment) is not applicable (argument mismatch; PlaceholderFragment cannot be converted to Fragment) Note: Some messages have been simplified; recompile with -Xdiags:verbose to get full output Error:Execution failed for task ':app:compileDebugJava'. Compilation failed; see the compiler error output for details.

Answer 1

आप FragmentActivity और getSupportFragmentManager() उपयोग कर रहे हैं। इसलिए, PlaceholderFragment को android.support.v4.app.Fragment से प्राप्त करने की आवश्यकता है, android.app.Fragment नहीं।

Answer 2

'आयात करें android.support.v4.app.Fragment; 'अपने प्रत्येक टुकड़े के लिए।