Android Studio，調用不同文件中的不同類

Question

我已經寫下了一段代碼，以引用名爲Forecast Fragment的類，並運行該應用程序。但第33行，我得到一個錯誤「無法解析符號‘機器人’」

package com.example.sunshinepre_beta; 

import android.os.Bundle; 
import android.app.Activity; 
import android.support.v7.app.ActionBarActivity; 
import android.view.Menu; 
import android.view.MenuItem; 


public class MainActivity extends ActionBarActivity { 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    if (savedInstanceState == null) { 
     int commit = getSupportFragmentManager().beginTransaction() 
       .add(R.id.container, new com.example.android.sunshinepre_beta.app.ForecastFragment()) 
       .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.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(); 
    if (id == R.id.action_settings) { 
     return true; 
    } 
    return super.onOptionsItemSelected(item); 
} 


}  

Answer 1

更換new com.example.android.sunshinepre_beta.app.ForecastFragment()與new ForecastFragment()

也動ForecastFragment.java到MainActivity是同一個文件夾。