无法转换为Fragment

Question

我创建了一个FragmentOne extends Fragment，我收到以下编译时错误：

  

＆＃34;无法转换为片段！＆＃34;，

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public class MainActivity extends AppCompatActivity {

  @Override
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
  }
  public void selectFrag(View view){
      Fragment fragment;
      if(view == findViewById(R.id.button1)){
          fragment = new FragmentOne();
      }
  }
} 

Answer 1

您正在使用AppcompatActivity。所以将片段导入替换为

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;

而不是

import android.app.Fragment;
import android.app.FragmentManager;
import android.app.FragmentTransaction;