无法解析方法’add(int,com.example.utkarsh.beatle.app.MainActivity.PlaceholderFragment)

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 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 weekForecast = new ArrayList(Arrays.asList(forecastArray)); mForecastAdapter = new ArrayAdapter(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; } }} 

消息Gradle Build Error:( 27,59 )错误:没有为add(int,PlaceholderFragment)方法find合适的方法FragmentTransaction.add(Fragment,String)不适用(参数不匹配; int不能转换为Fragment)方法FragmentTransaction.add (int,Fragment)不适用(参数不匹配; PlaceholderFragment无法转换为Fragment)注意:某些消息已经简化; 使用-Xdiags重新编译:详细以获得完整输出错误:任务’:app:compileDebugJava’的执行失败。 编译失败; 请参阅编译器错误输出以获取详细信

Related of "无法解析方法’add(int,com.example.utkarsh.beatle.app.MainActivity.PlaceholderFragment)"

您正在使用FragmentActivitygetSupportFragmentManager() 。 因此, PlaceholderFragment需要从android.support.v4.app.Fragmentinheritance,而不是android.app.Fragment

使用

  import android.support.v4.app.Fragment; 

代替

 import android.app.Fragment; 

在项目中全部。

另外,使用FragmentManager和FragmentTransaction的支持库。