Android初学第84天

一身转战三千里，一剑曾当百万师。这篇文章主要讲述Android初学第84天相关的知识，希望能为你提供帮助。
android初学第84天【Android初学第84天】24_NerdLauncher
代码 Nerdlauncher
NerdLauncherActivity.java

package com.bignerdranch.android.nerdlauncher; import android.support.v4.app.Fragment; public class NerdLauncherActivity extends SingleFragmentActivity {@Override protected Fragment createFragment() { return NerdLauncherFragment.newInstance(); } }

SingleFragmentActivity.java

package com.bignerdranch.android.nerdlauncher; 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(); @Override protected 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(); } } }