Android 动态添加Fragment

朴灿烈づ我的快乐病毒、 2022-07-19 02:14 223阅读 0赞

1.fragment1布局及代码

**布局**

<?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout 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"
    
        tools:context=".Fragment1Activity">
    
        <fragment
            android:layout_width="match_parent"
            android:layout_height="100dp"
            android:name="com.example.administrator.jreduch06.fragment.TopFragment"
            android:id="@+id/top_fragment"
            android:layout_alignParentTop="true"
            android:layout_alignParentEnd="true">
        </fragment>
        <fragment
            android:layout_width="match_parent"
            android:layout_height="300dp"
            android:id="@+id/leftfragment"
            android:name="com.example.administrator.jreduch06.fragment.LeftFragment"
            android:layout_below="@+id/top_fragment"
            android:layout_alignParentStart="true">
        </fragment>
        <FrameLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:id="@+id/fl"
            android:layout_alignParentStart="true"
            android:layout_below="@+id/leftfragment">
        </FrameLayout>
    </RelativeLayout>

代码

package com.example.administrator.jreduch06;
    
    import android.os.Bundle;
    import android.support.v7.app.AppCompatActivity;
    import android.support.v4.app.Fragment;
    import com.example.administrator.jreduch06.fragment.FirstFragment;
    import com.example.administrator.jreduch06.fragment.LeftFragment;
    import com.example.administrator.jreduch06.fragment.SecondFragment;
    
    public class Fragment1Activity extends AppCompatActivity implements LeftFragment.Myinterface {
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_fragment1);
        }
    
        @Override
        public void onchangeFragment(int which) {
            if(which==1){
                Fragment fragment1=new FirstFragment();
                getSupportFragmentManager()
                        .beginTransaction()
                        .replace(R.id.fl, fragment1)
                        .commit();
    
            }else if(which==2){
                Fragment fragment2=new SecondFragment();
                getSupportFragmentManager()
                        .beginTransaction()
                        .replace(R.id.fl,fragment2)
                        .commit();
            }
        }
    }

2.fragment2布局及代码

布局

package com.example.administrator.jreduch06;
    
    import android.support.v4.app.Fragment;
    import android.support.v7.app.AppCompatActivity;
    import android.os.Bundle;
    
    import com.example.administrator.jreduch06.fragment.FirstFragment;
    import com.example.administrator.jreduch06.fragment.SecondFragment;
    import com.example.administrator.jreduch06.fragmentcallback.OneFragment;
    
    public class Fragment2Activity extends AppCompatActivity
            implements OneFragment.OnFragmentInteractionListener{
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_fragment2);
        }
    
        @Override
        public void changeFragment(int which) {
            if(which==1){
                Fragment fragment1=new FirstFragment();
                getSupportFragmentManager()
                        .beginTransaction()
                        .replace(R.id.fl2, fragment1)
                        .commit();
    
            }else if(which==2){
                Fragment fragment2=new SecondFragment();
                getSupportFragmentManager()
                        .beginTransaction()
                        .replace(R.id.fl2,fragment2)
                        .commit();
            }
        }
    }

**3.FirstFragment代码及布局**

**布局：**

**代码：**

package com.example.administrator.jreduch06.fragment;
    import android.os.Bundle;
    import android.support.v4.app.Fragment;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    
    import com.example.administrator.jreduch06.R;
    
    /**
     * A simple {@link Fragment} subclass.
     */
    public class SecondFragment extends Fragment {
    
        public SecondFragment() {
            // Required empty public constructor
        }
    
       @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                                 Bundle savedInstanceState) {
            // Inflate the layout for this fragment
            return inflater.inflate(R.layout.fragment_second, container, false);
        }
    }

**4.SecondFragment代码及布局**

**布局：**

**代码：**

package com.example.administrator.jreduch06.fragment;
    import android.os.Bundle;
    import android.support.v4.app.Fragment;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import com.example.administrator.jreduch06.R;
    
    /**
     * A simple {@link Fragment} subclass.
     */
    public class FirstFragment extends Fragment {
    
        public SecondFragment() {
            // Required empty public constructor
        }
    
       @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                                 Bundle savedInstanceState) {
            // Inflate the layout for this fragment
            return inflater.inflate(R.layout.fragment_first, container, false);
        }
    }

**5.LeftFragment布局及代码**

**布局：**

**代码：**

package com.example.administrator.jreduch06.fragment;
    import android.content.Context;
    import android.os.Bundle;
    import android.support.v4.app.Fragment;
    import android.support.v4.app.FragmentManager;
    import android.support.v4.app.FragmentTransaction;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.Button;
    import android.widget.Toast;
    import com.example.administrator.jreduch06.R;
    
    /**
     * A simple {@link Fragment} subclass.
     */
    public class LeftFragment extends Fragment {
        private Fragment fragment1;
        private Fragment fragment2;
    
      private Myinterface myinterface ;
    
        public LeftFragment() {
    
        }
        @Override
        public void onAttach(Context context) {
            super.onAttach(context);
            if (context instanceof Myinterface) {
                myinterface= (Myinterface) context;
            } else {
                throw new RuntimeException(context.toString()
                        + " must implement OnFragmentInteractionListener");
            }
        }
    
        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                                 Bundle savedInstanceState) {
    
            View view=inflater.inflate(R.layout.fragment_left, container, false);
            Button bt1= (Button) view.findViewById(R.id.bt1);
            Button bt2= (Button) view.findViewById(R.id.bt2);
            Button bt3= (Button) view.findViewById(R.id.bt3);
            Button bt4= (Button) view.findViewById(R.id.bt4);
            Button bt5= (Button) view.findViewById(R.id.bt5);
            Button bt6= (Button) view.findViewById(R.id.bt6);
            bt1.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    Toast.makeText(getContext(), "点击了按钮1", Toast.LENGTH_SHORT).show();
                     fragment1=new FirstFragment();
                    FragmentManager fm=getFragmentManager();
                    FragmentTransaction fr=fm.beginTransaction();
                    fr.replace(R.id.fl,fragment1);
                    fr.commit();
                }
            });
            bt2.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                     fragment2 = new SecondFragment();
                    FragmentManager fm = getFragmentManager();
                    FragmentTransaction fr = fm.beginTransaction();
                    fr.replace(R.id.fl, fragment2);
                    fr.commit();
                }
            });
            bt3.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    myinterface.onchangeFragment(1);
                }
            });
            bt4.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    myinterface.onchangeFragment(2);
                }
            });
            bt5.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    if(fragment1!=null&& !fragment1.isHidden()){
                        getFragmentManager().beginTransaction()
                                .hide(fragment1).commit();
                    }
                    if(fragment2!=null&& !fragment2.isHidden()){
                        getFragmentManager().beginTransaction()
                                .hide(fragment2).commit();
                    }
                }
            });
           bt6.setOnClickListener(new View.OnClickListener() {
               @Override
               public void onClick(View v) {
                   if(fragment1!=null&&fragment1.isHidden()){
                       getFragmentManager().beginTransaction()
                               .show(fragment1).commit();
                   }
                   if(fragment2!=null&& fragment2.isHidden()){
                       getFragmentManager().beginTransaction()
                               .hide(fragment2).commit();
                   }
               }
           });
            return view;
        }
        
        public  interface Myinterface {
    
            void onchangeFragment(int which);
        }
    }

**效果：**

**点击第一个按钮出现Fragment1.**

**点击第二个按钮出现Fragment2**

**点击第三个按钮出现Fragment1.（方法不同）**

**点击第四个按钮出现Fragment2.（方法不同）**

**点击隐藏，字条消失**

**点击显示，字条出现**

**![Center][]**

[Center]: /images/20220718/5d4f504847d640b18c7f10ace355fb7a.png