Hata 'MainActivity'de' kapsayıcı 'çözümlenemiyor

Question

Aşağıda, MainActivity.Java dosya kodum var, Can't resolve Symbol 'container' işaretli' Kapsayıcı 'ile bir hatayla karşılaşıyorum. Burada yanlış yaptığım şey bana yardımcı olabilir mi? Programımda hiç başka hata yok.

package com.example.android.fragmentactivity; 

import android.net.Uri; 
import android.os.Bundle; 
import android.support.design.widget.FloatingActionButton; 
import android.support.design.widget.Snackbar; 
import android.support.v4.app.Fragment; 
import android.support.v7.app.AppCompatActivity; 

public class MainActivity extends AppCompatActivity { 

/** 
    * ATTENTION: This was auto-generated to implement the App Indexing API. 
    * See https://g.co/AppIndexing/AndroidStudio for more information. 
    */ 
private GoogleApiClient client; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    if (savedInstanceState == null) { 
    getSupportFragmentManager().beginTransaction() 
    .add(R.id.container, new PlaceholderFragment()) 
    .commit(); 
    } 
    // ATTENTION: This was auto-generated to implement the App Indexing API. 
    // See https://g.co/AppIndexing/AndroidStudio for more information. 
    client = new GoogleApiClient.Builder(this).addApi(AppIndex.API).build(); 
} 

@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); 

} 

@Override 
public void onStart() { 
    super.onStart(); 

    // ATTENTION: This was auto-generated to implement the App Indexing API. 
    // See https://g.co/AppIndexing/AndroidStudio for more information. 
    client.connect(); 
    Action viewAction = Action.newAction(
    Action.TYPE_VIEW, // TODO: choose an action type. 
    "Main Page", // TODO: Define a title for the content shown. 
    // TODO: If you have web page content that matches this app activity's content, 
    // make sure this auto-generated web page URL is correct. 
    // Otherwise, set the URL to null. 
    Uri.parse("http://host/path"), 
    // TODO: Make sure this auto-generated app deep link URI is correct. 
    Uri.parse("android-app://com.example.android.fragmentactivity/http/host/path") 
); 
    AppIndex.AppIndexApi.start(client, viewAction); 
} 

@Override 
public void onStop() { 
    super.onStop(); 

    // ATTENTION: This was auto-generated to implement the App Indexing API. 
    // See https://g.co/AppIndexing/AndroidStudio for more information. 
    Action viewAction = Action.newAction(
    Action.TYPE_VIEW, // TODO: choose an action type. 
    "Main Page", // TODO: Define a title for the content shown. 
    // TODO: If you have web page content that matches this app activity's content, 
    // make sure this auto-generated web page URL is correct. 
    // Otherwise, set the URL to null. 
    Uri.parse("http://host/path"), 
    // TODO: Make sure this auto-generated app deep link URI is correct. 
    Uri.parse("android-app://com.example.android.fragmentactivity/http/host/path") 
); 
    AppIndex.AppIndexApi.end(client, viewAction); 
    client.disconnect(); 
} 

/** 
    * A placeholder fragment containing a simple view. 
    */ 
public static class PlaceholderFragment extends Fragment { 

    public PlaceholderFragment() {} 

    @Override 
    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", 
    "Tomorrow , Sunny , 88/63", 
    "Wesneday , Sunny , 88/63", 
    "THursday , Sunny , 88/63", 
    "FRIDAY , Sunny , 88/63", 
    "Saturday , Sunny , 88/63", 
    "Sunday , Sunny , 88/63", 
    }; 

    List <String> weekForecast = new ArrayList <String> (
    Arrays.asList(forecastArray) 
    ); 

    ArrayAdapter <String> mForecastAdapter; 
    mForecastAdapter = new ArrayAdapter <String> (
    getActivity(), 
    R.layout.list_item_forecast, 
    android.R.id.text1, weekForecast); 
    ListView listView = (ListView) rootView.findViewById(R.id.listView_forecast); 
    listView.setAdapter(mForecastAdapter); 
    return rootView; 

    } 

} 
} 

Answer 1

Size id ile tanımladığınız hangi düzen bulamıyorum = container

bazen sizin xml kontrol edin ve kimlik aynı

<YourLayout 
     xmlns:android="http://schemas.android.com/apk/res/android" 
     ... 
     android:id="@+id/container" 
     > 

</YourLayout> 

gibi ChrisStillwell Yorum önerilen olduğunu doğrulamak Bu yeni bir değişiklikse, bir yeniden oluşturma sorunu çözebilir.