Fragment_动态加载

1.新建Fragment的XML布局文件。

2.在activity.xml中添加需要加载Fragment。列如：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.example.administrator.fragment_01.activity.MainActivity">

    <FrameLayout
        android:id="@+id/fragment_id"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1" />

    <LinearLayout
        android:id="@+id/layout_1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="bottom"
        android:orientation="horizontal">

        <Button
            android:id="@+id/activity_button_1"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="@string/button_1" />

        <Button
            android:id="@+id/activity_button_2"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="@string/button_2" />

    </LinearLayout>
</LinearLayout>

 

3.创建MyFragment类继承Fragment类。

public class MyFragment extends Fragment {

    @Override
    public View onCreateView(LayoutInflater inflater,  ViewGroup container,  Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.one_fragment, container,false);
        return view;
    }
}

4.创建待添加Fragment的实例。

5.获取FragmentManager。

6.开启一个事务。

7.向容器中添加或替换碎。

8.提交事务。

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    private Button button;
    private Button button1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button button = (Button) findViewById(R.id.activity_button_1);
        Button button1 = (Button) findViewById(R.id.activity_button_2);
        button.setOnClickListener(this);
        button1.setOnClickListener(this);
             //创建实例做参数穿入。
        replaceFragment(new MyFragment());
    }


    @Override
    public void onClick(View view) {

        switch (view.getId()) {
            case R.id.activity_button_1:
                replaceFragment(new MyFragment_2());
                Toast.makeText(this, "点击了第一个", Toast.LENGTH_SHORT).show();
                break;
            case R.id.activity_button_2:
                replaceFragment(new MyFragment());
                Toast.makeText(this, "点击了第二个", Toast.LENGTH_SHORT).show();
                break;
        }
    }

    private void replaceFragment(Fragment fragment) {
    35         //2.获取FragmentManager.
        FragmentManager fragmentManager = getSupportFragmentManager();
        //3.开启一个事务beginTransaction()
        FragmentTransaction transaction = fragmentManager.beginTransaction();
        //向容器中添加或替换碎片
        transaction.replace(R.id.fragment_id, fragment);
        //提交事务
        transaction.commit();
    }
}