一、fragment静态注册创建方法及步骤

1.创建一个StaticFragment.java文件继承Fragment类和一个static_fragment.xml文件完成fragment的布局。在StaticFragment.java中重载onCreateView(……)方法，通过调用inflater.inflate(……)方法并传入布局资源ID生成fragment的视图资源，并绑定static_fragment.xml中的相关组件然后实现其功能。实现代码如下：

static_fragment.xml

<?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" tools:context=".StaticFragment" android:orientation="vertical"> <Button android:id="@+id/btn_fm" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="这是fragment静态注册" android:textAllCaps="false"> </Button> <EditText android:id="@+id/et_fm" android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="请输入你要改变的内容："> </EditText></LinearLayout>

StaticFragment.java

package com.example.myapplication;import android.os.Bundle;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.Button;import android.widget.EditText;import androidx.annotation.NonNull;import androidx.annotation.Nullable;import androidx.fragment.app.Fragment;public class StaticFragment extends Fragment { private Button mBtnFm; private EditText mEtFm; @Nullable @Override public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { //fragment的视图资源是直接通过调用inflater.inflate(……)方法并传入布局资源ID生成的。 View v = inflater.inflate(R.layout.static_fragment, container,false); mEtFm = v.findViewById(R.id.et_fm); mBtnFm = v.findViewById(R.id.btn_fm); mBtnFm.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { mBtnFm.setText(mEtFm.getText().toString()); } }); return v; }}

2.在主布局activity_main.xml文件中绑定fragment布局文件。

实现代码如下：

activity_main.xml

<?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" tools:context=".MainActivity" android:orientation="vertical"> <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="这是主布局" android:textColor="@color/colorAccent" android:textSize="30sp"> </TextView> <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="下面是fragment的布局" android:textColor="@color/colorPrimaryDark" android:textSize="30sp"> </TextView> <fragment android:id="@+id/static_fm" android:name="com.example.myapplication.StaticFragment" android:layout_width="match_parent" android:layout_height="wrap_content"> </fragment></LinearLayout>

注意：布局文件中加fragment节点，name属性必须填写完整的路径

MainActivity.java

package com.example.myapplication;import androidx.appcompat.app.AppCompatActivity;import android.os.Bundle;public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); }}

演示：

二、fragment动态注册创建方法及步骤

1.新建一个项目，创建2个Fragment继承类分别为MyFragment1.java和MyFragment2.java，然后创建2个布局文件分别为fragment1.xml和fragment2.xml.详细代码如下：

fragment1.xml

<?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" tools:context=".MyFragment1" android:gravity="center" android:background="@color/colorPrimaryDark"> <TextView android:layout_width="wrap_content" android:layout_height="match_parent" android:gravity="center" android:text="@string/hello_blank_fragment" android:textSize="30sp" android:textAllCaps="false" android:textColor="#F70505"> </TextView></LinearLayout>

MyFragment1.java

package com.example.myapplication;import android.content.Context;import android.net.Uri;import android.os.Bundle;import androidx.fragment.app.Fragment;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;public class MyFragment1 extends Fragment { @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // Inflate the layout for this fragment return inflater.inflate(R.layout.fragment1, container, false); }}

fragment2.xml

<?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" tools:context=".MyFragment2" android:gravity="center" android:background="@color/colorAccent"> <TextView android:layout_width="wrap_content" android:layout_height="match_parent" android:gravity="center" android:text="@string/hello_blank_fragment" android:textSize="30sp" android:textAllCaps="false" android:textColor="#03FAE3"> </TextView></LinearLayout>

MyFragment2.java

package com.example.myapplication;import android.os.Bundle;import androidx.fragment.app.Fragment;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;public class MyFragment2 extends Fragment { @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // Inflate the layout for this fragment return inflater.inflate(R.layout.fragment2, container, false); }}

上述代码与静态创建的区别不大。

2.以代码的形式将fragment添加到activity需要在activity里直接调用FragmentManager。

FragmentManager fm = getSupportFragmentManager();

然后通过代码块：

FragmentTransaction ts = fm.beginTransaction();Fragment mfg1 = new MyFragment1();ts.add(R.id.fragment_container,mfg1);ts.commit();

提交一个fragment事务。其核心是ts.add(……)方法。

详细代码如下：

activity_main.xml：

<?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=".MainActivity"> <LinearLayout android:id="@+id/linear" android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center" android:layout_alignParentBottom="true"> <Button android:id="@+id/btn_dy1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="fragment1" android:textColor="@color/colorAccent" android:textSize="30sp"> </Button> <Button android:id="@+id/btn_dy2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="fragment2" android:textColor="@color/colorPrimaryDark" android:textSize="30sp"> </Button> </LinearLayout> <FrameLayout android:id="@+id/fragment_container" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_above="@id/linear"> </FrameLayout></RelativeLayout>

注意：fragment模块一般用FrameLayout布局承载

MainActivity.java

package com.example.myapplication;import androidx.appcompat.app.AppCompatActivity;import androidx.fragment.app.Fragment;import androidx.fragment.app.FragmentManager;import androidx.fragment.app.FragmentTransaction;import android.os.Bundle;import android.view.View;import android.widget.Button;public class MainActivity extends AppCompatActivity implements View.OnClickListener { private Button mBtnDy1; private Button mBtnDy2; FragmentManager fm; Fragment mfg1; Fragment mfg2; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); fm = getSupportFragmentManager(); mBtnDy1 = findViewById(R.id.btn_dy1); mBtnDy2 = findViewById(R.id.btn_dy2); mBtnDy1.setOnClickListener(this); mBtnDy2.setOnClickListener(this); } @Override public void onClick(View v) { clearSelection();//清除按钮状态 FragmentTransaction ts = fm.beginTransaction(); hideFragments(ts); switch (v.getId()){ case R.id.btn_dy1: mBtnDy1.setBackgroundColor(0xff0000ff); if(mfg1 == null){ mfg1 = new MyFragment1(); ts.add(R.id.fragment_container,mfg1); }else { ts.show(mfg1); } break; case R.id.btn_dy2: mBtnDy2.setBackgroundColor(0xff0000ff); if(mfg2 == null){ mfg2 = new MyFragment2(); ts.add(R.id.fragment_container,mfg2); }else { ts.show(mfg2); } break; default: break; } ts.commit(); }// 将所有的Fragment都置为隐藏状态。 private void hideFragments(FragmentTransaction transaction) { if (mfg1 != null) { transaction.hide(mfg1); } if (mfg2 != null) { transaction.hide(mfg2); } }// 清除掉所有的选中状态。 private void clearSelection() { mBtnDy1.setBackgroundColor(0xffffffff); mBtnDy2.setBackgroundColor(0xffffffff); }}

演示：

总结

以上所述是小编给大家介绍的Android Fragment的静态注册和动态注册创建步骤，希望对大家有所帮助！