Android Fragment：基本使用

Posted 2020-12-23 Gatsby

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三、

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="@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="@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、

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="@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="@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;
        }

    }

}

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