Android 动态添加Fragment_android fragment添加到layout中-优快云博客

本文链接：https://blog.youkuaiyun.com/d18865556765/article/details/52155844

本文通过具体示例展示了如何在Android应用中实现Fragment的布局与代码设计，包括不同Fragment间的切换及回调交互，帮助开发者掌握Fragment的基本使用技巧。

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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

<?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="com.example.administrator.jreduch06.Fragment2Activity">
  <fragment
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:id="@+id/one_fragment"
      android:name="com.example.administrator.jreduch06.fragmentcallback.OneFragment"
      >
  </fragment>
    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/fl2"
        android:layout_below="@+id/linearlatout"
        >
    </FrameLayout>
</RelativeLayout>
代码：

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：

<FrameLayout 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="com.example.administrator.jreduch06.fragment.FirstFragment">   
    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:textSize="30sp"
        android:id="@+id/tv"
        android:text="我是Fragment1"
        android:layout_gravity="center_horizontal|bottom" />
</FrameLayout>

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：

<FrameLayout 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="com.example.administrator.jreduch06.fragment.SecondFragment">
    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:textSize="30sp"
        android:text="我是Fragment2" />
</FrameLayout>

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：

<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"
    android:background="#bece0d"
    tools:context="com.example.administrator.jreduch06.fragment.LeftFragment">

<Button
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="第一个Fragment"
    android:id="@+id/bt1"
    />
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="第二个Fragment"
        android:id="@+id/bt2"
        />
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="callback1"
        android:id="@+id/bt3"
        />
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="callback2"
        android:id="@+id/bt4"
        />
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="隐藏"
        android:id="@+id/bt5"
        />
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="显示"
        android:id="@+id/bt6"
        />
</LinearLayout>

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