Android初學第84天

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Android初學第84天

24_NerdLauncher

代碼NerdlauncherNerdLauncherActivity.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();        }    }}

Android初學第84天