Android初学第21天
09_LayoutsAndWidgets
代码
SignleFragmentActivity.java
package com.bignerdranch.android.criminalintent;import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v7.app.AppCompatActivity;public abstract class SingleFragmentActivity extends AppCompatActivity {protected abstract Fragment createFragment();@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_fragment);FragmentManager fm = getSupportFragmentManager();Fragment fragment = fm.findFragmentById(R.id.fragment_container);if (fragment == null) {fragment = createFragment();fm.beginTransaction().add(R.id.fragment_container, fragment).commit();}}
}
)
)
