Android-Fragment碎片的使用

最新推荐文章于 2023-01-09 19:17:21 发布

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本文介绍了一个Android应用程序中如何使用MainActivity管理并切换不同的Fragment实例。通过replaceFragment()方法可以在界面上替换显示不同的Fragment，实现界面内容的动态变化。

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MainActivity

public class MainActivity extends AppCompatActivity implements View.OnClickListener{

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button button = (Button) findViewById(R.id.button);
        button.setOnClickListener(this);
        replaceFragment(new RightFragment());//用replaceFragment()加载碎片
    }


    @Override
    public void onClick(View view) {
        switch (view.getId()){
            case R.id.button:
                replaceFragment(new RightFragment2());
                break;
            default:
                break;
        }
    }

    private void replaceFragment(Fragment fragment) {//加载碎片
        FragmentManager fragmentManager = getSupportFragmentManager();//
        FragmentTransaction transaction = fragmentManager.beginTransaction();//开启一个事务
        transaction.replace(R.id.right_layout,fragment);//向容器添加碎片
        transaction.addToBackStack(null);//将事务加入返回栈
        transaction.commit();//提交事务
    }
}

LeftFragment

public class LeftFragment extends Fragment {
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savefInstanceState){
        View view = inflater.inflate(R.layout.left_fragment,container,false);
        return view;
    }
}

RightFragment

public class RightFragment2 extends Fragment {
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savefInstanceState){
        View view = inflater.inflate(R.layout.right_fragment_2,container,false);
        return view;
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <fragment
        android:id="@+id/left_fragment"
        android:name="com.ldxiaofeng.android.fragmenttest.LeftFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        />

    <!--fragment
        android:id="@+id/right_fragment"
        android:name="com.ldxiaofeng.android.fragmenttest.RightFragment"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="1"/-->
    <!--FrameLayout
        android:id="@+id/right_layout"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="1">

    </FrameLayout-->

</LinearLayout>

left_fragment.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:text="Button"/>
</LinearLayout>

right_fragment.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#00ff00">

    <TextView
        android:id="@+id/text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:text="这是右碎片"
        android:textSize="26sp"/>
</LinearLayout>