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：

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     xmlns:tools="http://schemas.android.com/tools"
 4     android:layout_width="match_parent"
 5     android:layout_height="match_parent"
 6     android:orientation="vertical"
 7     tools:context="com.example.administrator.fragment_01.activity.MainActivity">
 8 
 9     <FrameLayout
10         android:id="@+id/fragment_id"
11         android:layout_width="match_parent"
12         android:layout_height="0dp"
13         android:layout_weight="1" />
14 
15     <LinearLayout
16         android:id="@+id/layout_1"
17         android:layout_width="match_parent"
18         android:layout_height="wrap_content"
19         android:gravity="bottom"
20         android:orientation="horizontal">
21 
22         <Button
23             android:id="@+id/activity_button_1"
24             android:layout_width="0dp"
25             android:layout_height="wrap_content"
26             android:layout_weight="1"
27             android:text="@string/button_1" />
28 
29         <Button
30             android:id="@+id/activity_button_2"
31             android:layout_width="0dp"
32             android:layout_height="wrap_content"
33             android:layout_weight="1"
34             android:text="@string/button_2" />
35 
36     </LinearLayout>
37 </LinearLayout>

3.创建MyFragment类继承Fragment类。

1 public class MyFragment extends Fragment {
2 
3     @Override
4     public View onCreateView(LayoutInflater inflater,  ViewGroup container,  Bundle savedInstanceState) {
5         View view = inflater.inflate(R.layout.one_fragment, container,false);
6         return view;
7     }
8 }

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。

 1 public class MainActivity extends AppCompatActivity implements View.OnClickListener {
 2 
 3     private Button button;
 4     private Button button1;
 5 
 6     @Override
 7     protected void onCreate(Bundle savedInstanceState) {
 8         super.onCreate(savedInstanceState);
 9         setContentView(R.layout.activity_main);
10         Button button = (Button) findViewById(R.id.activity_button_1);
11         Button button1 = (Button) findViewById(R.id.activity_button_2);
12         button.setOnClickListener(this);
13         button1.setOnClickListener(this);
             //创建实例做参数穿入。
14         replaceFragment(new MyFragment());
15     }
16 
17 
18     @Override
19     public void onClick(View view) {
20 
21         switch (view.getId()) {
22             case R.id.activity_button_1:
23                 replaceFragment(new MyFragment_2());
24                 Toast.makeText(this, "点击了第一个", Toast.LENGTH_SHORT).show();
25                 break;
26             case R.id.activity_button_2:
27                 replaceFragment(new MyFragment());
28                 Toast.makeText(this, "点击了第二个", Toast.LENGTH_SHORT).show();
29                 break;
30         }
31     }
32 
33     private void replaceFragment(Fragment fragment) {
34     35         //2.获取FragmentManager.
36         FragmentManager fragmentManager = getSupportFragmentManager();
37         //3.开启一个事务beginTransaction()
38         FragmentTransaction transaction = fragmentManager.beginTransaction();
39         //向容器中添加或替换碎片
40         transaction.replace(R.id.fragment_id, fragment);
41         //提交事务
42         transaction.commit();
43     }
44 }