建立fragment（动态静态）

Posted 2023-04-10 JIANGzihao0222

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fragment建立

一：静态建立

StaticFragmentActivity：
//建立StaticFragmentActivity来承载fragment

public class StaticFragmentActivity extends AppCompatActivity 

    @Override
    protected void onCreate(Bundle savedInstanceState) 
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_static_fragment);
    

布局：提前绑定：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_
    android:layout_
    tools:context=".StaticFragmentActivity">
   <fragment
       android:id="@+id/fragment"
       android:layout_
       android:layout_
       tools:layout="@layout/fragment_static"
       android:name="com.example.fragment.fragment.StaticFragment"
       />

</LinearLayout>
绑定内容：

<fragment
       android:id="@+id/fragment"
       android:layout_
       android:layout_
       tools:layout="@layout/fragment_static"
       android:name="com.example.fragment.fragment.StaticFragment"
       />
建立fragment：

public class StaticFragment extends Fragment 

    // TODO: Rename parameter arguments, choose names that match
    // the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
    private static final String ARG_PARAM1 = "param1";
    private static final String ARG_PARAM2 = "param2";

    // TODO: Rename and change types of parameters
    private String mParam1;
    private String mParam2;

    public StaticFragment() 
        // Required empty public constructor
    

    /**
     * Use this factory method to create a new instance of
     * this fragment using the provided parameters.
     *
     * @param param1 Parameter 1.
     * @param param2 Parameter 2.
     * @return A new instance of fragment StaticFragment.
     */
    // TODO: Rename and change types and number of parameters
    public static StaticFragment newInstance(String param1, String param2) 
        StaticFragment fragment = new StaticFragment();
        Bundle args = new Bundle();
        args.putString(ARG_PARAM1, param1);
        args.putString(ARG_PARAM2, param2);
        fragment.setArguments(args);
        return fragment;
    

    @Override
    public void onCreate(Bundle savedInstanceState) 
        super.onCreate(savedInstanceState);
        if (getArguments() != null) 
            mParam1 = getArguments().getString(ARG_PARAM1);
            mParam2 = getArguments().getString(ARG_PARAM2);
        
    

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) 
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_static, container, false);
    
    private TextView tvLike;
    private RadioButton rbLike,rbDislike;
    private RatingBar rbStar;
    @Override

    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) 
        super.onViewCreated(view, savedInstanceState);
        tvLike = view.findViewById(R.id.tv_like);
        rbLike = view.findViewById(R.id.rb_like);
        rbDislike = view.findViewById(R.id.rb_dislike);
        rbStar = view.findViewById(R.id.rb_star);
        rbLike.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() 
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) 
                if(isChecked)
                
                    tvLike.setText("app喜欢");
                

            
        );
        rbDislike.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() 
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) 
                if(isChecked)
                
                    tvLike.setText("app不喜欢");
                
            
        );
        rbStar.setOnRatingBarChangeListener(new RatingBar.OnRatingBarChangeListener() 
            @Override
            public void onRatingChanged(RatingBar ratingBar, float rating, boolean fromUser) 
                if(fromUser)
                
                    Toast.makeText(getActivity(), "点了"+rating, Toast.LENGTH_SHORT).show();
                
            
        );

在onViewCreated内进行操作，设立具体的事件。
fragment布局：

<?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_
    android:layout_
    tools:context=".fragment.StaticFragment"
    android:padding="10dp"
    android:orientation="vertical">

  <LinearLayout
      android:layout_
      android:layout_
      android:orientation="horizontal"
      android:gravity="center_vertical">
      <TextView
          android:layout_
          android:layout_
          android:text="喜欢"
          android:textSize="20dp"
          android:id="@+id/tv_like"/>
      <RadioGroup
          android:layout_
          android:layout_
          android:orientation="horizontal"
          >
          <RadioButton
              android:id="@+id/rb_like"
              android:layout_
              android:layout_
              android:text="喜欢"
              android:textSize="20sp"
              />
          <RadioButton
              android:id="@+id/rb_dislike"
              android:layout_
              android:layout_
              android:text="不喜欢"
              android:textSize="20sp"
              />
      </RadioGroup>

  </LinearLayout>
    <RatingBar
        android:layout_
        android:layout_
        android:id="@+id/rb_star"
        />

</LinearLayout>

二：动态建立

activity方面：DynamicFragmentActivity

public class DynamicFragmentActivity extends AppCompatActivity 

    @Override
    protected void onCreate(Bundle savedInstanceState) 
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_dynamic_fragment);
        if(savedInstanceState == null)//判断第一次点入，防止操作丢失
        
            FragmentManager fragmentManager = getSupportFragmentManager();
            FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();//事务
            fragmentTransaction.add(R.id.fcv, DynamicFragment.class,null)
            .setReorderingAllowed(true)
            .addToBackStack(null)
            .commit();

核心代码：

           FragmentManager fragmentManager = getSupportFragmentManager();
            FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();//事务
            fragmentTransaction.add(R.id.fcv, DynamicFragment.class,null)
            .setReorderingAllowed(true)//可省
            .addToBackStack(null)//可省

             .commit();

DynamicFragmentActivity布局：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_
    android:layout_
    tools:context=".DynamicFragmentActivity">
   <androidx.fragment.app.FragmentContainerView
       android:id="@+id/fcv"
       android:layout_
       android:layout_
       />

</LinearLayout>
//进行具体替换的地方

 <androidx.fragment.app.FragmentContainerView
       android:id="@+id/fcv"
       android:layout_
       android:layout_
       />

动态fragment：DynamicFragment

public class DynamicFragment extends Fragment 

    // TODO: Rename parameter arguments, choose names that match
    // the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
    private static final String ARG_PARAM1 = "param1";
    private static final String ARG_PARAM2 = "param2";

    // TODO: Rename and change types of parameters
    private String mParam1;
    private String mParam2;

    public DynamicFragment() 
        // Required empty public constructor
    

    /**
     * Use this factory method to create a new instance of
     * this fragment using the provided parameters.
     *
     * @param param1 Parameter 1.
     * @param param2 Parameter 2.
     * @return A new instance of fragment DynamicFragment.
     */
    // TODO: Rename and change types and number of parameters
    public static DynamicFragment newInstance(String param1, String param2) 
        DynamicFragment fragment = new DynamicFragment();
        Bundle args = new Bundle();
        args.putString(ARG_PARAM1, param1);
        args.putString(ARG_PARAM2, param2);
        fragment.setArguments(args);
        return fragment;
    

    @Override
    public void onCreate(Bundle savedInstanceState) 
        super.onCreate(savedInstanceState);
        if (getArguments() != null) 
            mParam1 = getArguments().getString(ARG_PARAM1);
            mParam2 = getArguments().getString(ARG_PARAM2);
        
    

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) 
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_dynamic, container, false);
    
    private TextView tvLike;
    private RadioButton rbLike,rbDislike;
    private RatingBar rbStar;
    @Override

    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) 
        super.onViewCreated(view, savedInstanceState);
        tvLike = view.findViewById(R.id.tv_like);
        rbLike = view.findViewById(R.id.rb_like);
        rbDislike = view.findViewById(R.id.rb_dislike);
        rbStar = view.findViewById(R.id.rb_star);
        rbLike.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() 
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) 
                if(isChecked)
                
                    tvLike.setText("app喜欢");
                

            
        );
        rbDislike.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() 
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) 
                if(isChecked)
                
                    tvLike.setText("app不喜欢");
                
            
        );
        rbStar.setOnRatingBarChangeListener(new RatingBar.OnRatingBarChangeListener() 
            @Override
            public void onRatingChanged(RatingBar ratingBar, float rating, boolean fromUser) 
                if(fromUser)
                
                    Toast.makeText(getActivity(), "点了"+rating, Toast.LENGTH_SHORT).show();
                
            
        );

DynamicFragment 布局：

<?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_
    android:layout_
    tools:context=".fragment.DynamicFragment"
    android:padding="10dp"
    android:orientation="vertical">

    <LinearLayout
        android:layout_
        android:layout_
        android:orientation="horizontal"
        android:gravity="center_vertical">
        <TextView
            android:layout_
            android:layout_
            android:text="喜欢"
            android:textSize="20dp"
            android:id="@+id/tv_like"/>
        <RadioGroup
            android:layout_
            android:layout_
            android:orientation="horizontal"
            >
            <RadioButton
                android:id="@+id/rb_like"
                android:layout_
                android:layout_
                android:text="喜欢"
                android:textSize="20sp"
                />
            <RadioButton
                android:id="@+id/rb_dislike"
                android:layout_
                android:layout_
                android:text="不喜欢"
                android:textSize="20sp"
                />
        </RadioGroup>

    </LinearLayout>
    <RatingBar
        android:layout_
        android:layout_
        android:id="@+id/rb_star"
        />
</LinearLayout>

Android:Fragment

Fragment:小型的Activity,需要嵌套在Activity中使用,受宿主Activity的生命周期影响;

/*图片取自菜鸟教程,侵删*/

1>静态加载流程.

2>动态加载Fragment;

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