Android Fragment（基本使用）

丈夫志四海，万里犹比邻。这篇文章主要讲述Android Fragment：基本使用相关的知识，希望能为你提供帮助。

【Android Fragment（基本使用）】
三、

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四、代码
4.1、activity_main.xml

< ?xml version="1.0" encoding="utf-8"?> < LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center" android:orientation="horizontal" > < !-- 静态加载fragment：把fragment当成一个ui标签使用 --> < fragment android:id="@+id/first" android:name="com.gatsby.fragmentone.FirstFragment" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_weight="1" /> < fragment android:id="@+id/second" android:name="com.gatsby.fragmentone.SecondFragment" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_weight="1" /> < /LinearLayout>

4.2、fragment_first.xml

< ?xml version="1.0" encoding="utf-8"?> < LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > < TextView android:layout_width="match_parent" android:layout_height="match_parent" android:text="FirstFragment" android:textSize="64sp" android:gravity="center"/> < ImageView android:layout_width="match_parent" android:layout_height="match_parent" android:src="https://www.songbingjia.com/android/@drawable/image1" /> < /LinearLayout>

4.3、fragment_second.xml

< ?xml version="1.0" encoding="utf-8"?> < LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > < TextView android:layout_width="match_parent" android:layout_height="match_parent" android:text="SecondFragment" android:textSize="64sp" android:gravity="center"/> < ImageView android:layout_width="match_parent" android:layout_height="match_parent" android:src="https://www.songbingjia.com/android/@drawable/image8" /> < /LinearLayout>

4.5、MaInActivity.java

package com.gatsby.fragmentone; import android.app.Activity; import android.os.Bundle; import android.view.Menu; import android.view.MenuItem; public class MainActivity extends Activity {@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); }}

4.6、FirstFragment.java

package com.gatsby.fragmentone; import android.app.Fragment; import android.os.Bundle; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; public class FirstFragment extends Fragment {@Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // TODO Auto-generated method stub View view = inflater.inflate(R.layout.fragment_first, container, false); return view; } }

4.7、SecondFragment.java

package com.gatsby.fragmentone; import android.app.Fragment; import android.os.Bundle; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; public class SecondFragment extends Fragment{@Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // TODO Auto-generated method stub View view = inflater.inflate(R.layout.fragment_second, container, false); return view; } }

五、

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5.1、activity_main.xml

< ?xml version="1.0" encoding="utf-8"?> < LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center" android:orientation="vertical" > < LinearLayout android:id="@+id/fragment_id" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:orientation="horizontal" /> < Button android:id="@+id/btn1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="FragmentFirst" android:textSize="16sp" /> < Button android:id="@+id/btn2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="FragmentSecond" android:textSize="16sp" /> < /LinearLayout>

5.2、fragment_first.xml

< ?xml version="1.0" encoding="utf-8"?> < LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > < LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:orientation="vertical" > < TextView android:id="@+id/textView1" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center" android:text="FirstFragment" android:textSize="16sp" /> < ImageView android:id="@+id/imageView1" android:layout_width="match_parent" android:layout_height="match_parent" android:src="https://www.songbingjia.com/android/@drawable/image12"/> < /LinearLayout> < /LinearLayout>

5.3、fragment_second.xml

< ?xml version="1.0" encoding="utf-8"?> < LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > < LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:orientation="vertical" > < TextView android:id="@+id/textView2" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center" android:text="SecondFragment" android:textSize="16sp" /> < ImageView android:id="@+id/imageView2" android:layout_width="match_parent" android:layout_height="match_parent" android:src="https://www.songbingjia.com/android/@drawable/image9" /> < /LinearLayout> < /LinearLayout>

5.4、MainActivity.java

package com.gatsby.fragmenttwo; import android.app.Activity; import android.app.FragmentManager; import android.app.FragmentTransaction; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; public class MainActivity extends Activity implements OnClickListener {Button btn1, btn2; FragmentManager fragmentManager; // Fragment 管理器 FragmentTransaction fragmentTransaction; // Fragment 事务处理@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initView(); }private void initView() { btn1 = (Button) findViewById(R.id.btn1); btn2 = (Button) findViewById(R.id.btn2); btn1.setOnClickListener(this); btn2.setOnClickListener(this); fragmentManager = getFragmentManager(); // 得到Fragment 管理器对象fragmentTransaction = fragmentManager.beginTransaction(); // 开始fragmnet 的事务处理 FirstFragment firstfragment = new FirstFragment(); fragmentTransaction.add(R.id.fragment_id, firstfragment); // fragment_id 是布局中给fragment 占位置的控 fragmentTransaction.commit(); // 提交事务}@Override public void onClick(View v) { fragmentManager = getFragmentManager(); fragmentTransaction = fragmentManager.beginTransaction(); switch (v.getId()) { case R.id.btn1: fragmentTransaction.replace(R.id.fragment_id, new FirstFragment()); fragmentTransaction.addToBackStack(null); break; case R.id.btn2: fragmentTransaction.replace(R.id.fragment_id, new SecondFragment()); fragmentTransaction.addToBackStack(null); break; } fragmentTransaction.commit(); }}

5.5、FirstFragment.java

package com.gatsby.fragmenttwo; import android.app.Fragment; import android.os.Bundle; import android.view.LayoutInflater; import android.view.View; import android.view.View.OnClickListener; import android.view.ViewGroup; import android.widget.ImageView; import android.widget.TextView; public class FirstFragment extends Fragment implements OnClickListener {TextView textView1; ImageView imageView1; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // TODO Auto-generated method stub View view = inflater.inflate(R.layout.fragment_first, container, false); textView1 = (TextView) view.findViewById(R.id.textView1); imageView1 = (ImageView) view.findViewById(R.id.imageView1); imageView1.setOnClickListener(this); return view; }@Override public void onClick(View v) { // TODO Auto-generated method stub switch (v.getId()) { case R.id.imageView1: textView1.setText("you onClick FragmentFirst!"); imageView1.setImageResource(R.drawable.image23); break; default: break; }}}

5.6、SecondFragment.java

package com.gatsby.fragmenttwo; import android.app.Fragment; import android.os.Bundle; import android.view.LayoutInflater; import android.view.View; import android.view.View.OnClickListener; import android.view.ViewGroup; import android.widget.ImageView; import android.widget.TextView; public class SecondFragment extends Fragment implements OnClickListener {TextView textView2; ImageView imageView2; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // TODO Auto-generated method stub View view = inflater.inflate(R.layout.fragment_second, container, false); textView2 = (TextView) view.findViewById(R.id.textView2); imageView2= (ImageView) view.findViewById(R.id.imageView2); imageView2.setOnClickListener(this); return view; }@Override public void onClick(View v) { // TODO Auto-generated method stub switch (v.getId()) { case R.id.imageView2: textView2.setText("you onClick FragmentSecond!"); imageView2.setImageResource(R.drawable.image17); break; default: break; }}}