Android初學第81天

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Android初學第81天

20_MVVM

代碼BeatBoxBeatBoxActivity.java

package com.bignerdranch.android.beatbox;import android.support.v4.app.Fragment;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;public class BeatBoxActivity extends SingleFragmentActivity {    @Override    protected Fragment createFragment() {        return BeatBoxFragment.newInstance();    }}

SingleFragmentActivity.java

package com.bignerdranch.android.beatbox;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();    protected int getLayoutResId() {        return R.layout.activity_fragment;    }    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(getLayoutResId());        FragmentManager manager = getSupportFragmentManager();        Fragment fragment = manager.findFragmentById(R.id.fragment_container);        if (fragment == null) {            fragment = createFragment();            manager.beginTransaction()                .add(R.id.fragment_container, fragment)                .commit();        }    }}

Android初學第81天