Android Fragment

作者: 百里漫步 | 来源:发表于2017-10-21 14:29 被阅读0次

首先有一个底部导航，用RadioGroup和RadioButton实现
这里主要写静态和动态加载的fragment
main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <LinearLayout
        android:id="@+id/frame"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical" >
    </LinearLayout>



    <RadioGroup
        android:id="@+id/radiogroup"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:gravity="center_horizontal"
        android:orientation="horizontal" >

        <RadioButton
            android:id="@+id/first"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:background="@drawable/radio_pressed"
            android:button="@null"
            android:drawableTop="@drawable/ic_launcher"
            android:gravity="center_horizontal"
            android:text="静态加载" />

        <RadioButton
            android:id="@+id/second"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:background="@drawable/radio_pressed"
            android:button="@null"
            android:drawableTop="@drawable/ic_launcher"
            android:gravity="center_horizontal"
            android:text="动态加载" />

        <RadioButton
            android:id="@+id/thrid"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:background="@drawable/radio_pressed"
            android:button="@null"
            android:drawableTop="@drawable/ic_launcher"
            android:gravity="center_horizontal"
            android:text="生命周期" />

        <RadioButton
            android:id="@+id/fourth"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:background="@drawable/radio_pressed"
            android:button="@null"
            android:drawableTop="@drawable/ic_launcher"
            android:gravity="center_horizontal"
            android:text="传值通信" />
    </RadioGroup>

</RelativeLayout>

MainActivity.java

package com.example.android_fragment;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.content.Intent;
import android.os.Bundle;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;

public class MainActivity extends Activity implements OnCheckedChangeListener
 {

    private RadioGroup group;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        group = (RadioGroup) findViewById(R.id.radiogroup);
        group.setOnCheckedChangeListener(this);

    }

    @Override
    public void onCheckedChanged(RadioGroup group, int checkedId) {
        // TODO Auto-generated method stub

        switch (checkedId) {
        case R.id.first: {
            //静态添加fragment
            Intent intent=new Intent(this,MainActivity2.class);
            startActivity(intent);
            break;

        }
        case R.id.second: {
            //动态添加fragment
            MyFragment2 fragment2=new MyFragment2();
            FragmentManager fragmentManager = getFragmentManager();
            FragmentTransaction beginTransaction = fragmentManager.beginTransaction();
            beginTransaction.add(R.id.frame, fragment2);
            beginTransaction.addToBackStack(null);
            beginTransaction.commit();
            break;
        }
        case R.id.thrid: {
            Intent intent=new Intent(MainActivity.this,MainActivity3.class);
            startActivity(intent);

            break;
        }
        case R.id.fourth: {
            Intent intent=new Intent(MainActivity.this,MainActivity4.class);
            startActivity(intent);

            break;
         }
        }
    }
}

MyFragment.java

package com.example.android_fragment;

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.Button;
import android.widget.TextView;
import android.widget.Toast;

public class MyFragment extends Fragment{
    
    private String aaa;
    
    
    public String getAaa() {
        return aaa;
    }


    public void setAaa(String aaa) {
        this.aaa = aaa;
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        //layout布局文件转换成View对象
        /**
         * resource:Fragment需要加载的布局文件
         * root：加载layout的父ViewGroup
         * attactToRoot：false，不返回父ViewGroup
         */
        View view = inflater.inflate(R.layout.fragment, container, false);
        TextView text=(TextView) view.findViewById(R.id.text);
        Button button=(Button) view.findViewById(R.id.button);
        text.setText("静态加载Fragment");
        button.setText("获取内容");
        button.setOnClickListener(new OnClickListener() {
            
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                String value = getAaa();
                Toast.makeText(getActivity(), "value="+value, Toast.LENGTH_SHORT).show();
            }
        });
        return view;
    }

}

MyFragment2.java

package com.example.android_fragment;

import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

public class MyFragment2 extends Fragment{
    
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        //layout布局文件转换成View对象
        
        /**
         * resource:Fragment需要加载的布局文件
         * root：加载layout的父ViewGroup
         * attactToRoot：false，不返回父ViewGroup
         */
        View view = inflater.inflate(R.layout.fragment, container, false);
        TextView text=(TextView) view.findViewById(R.id.text);
        text.setText("动态加载Fragment");
        return view;
    
    }

}

main2.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" >

    <fragment
        android:id="@+id/fragment"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:name="com.example.android_fragment.MyFragment"
        />

</LinearLayout>

MainActivity2.java

package com.example.android_fragment;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity2 extends Activity{

    
    private TextView tv;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main2);
        Button button=(Button) findViewById(R.id.button);
        tv=(TextView) findViewById(R.id.text);
        button.setText("改变");
        button.setOnClickListener(new OnClickListener() {
            
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                tv.setText("TextView改变了");
            }
        });
        
    }
}

radio_press.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:drawable="@color/gray" android:state_checked="true"></item>
    <item android:drawable="@color/white" android:state_pressed="true"></item>
    <item android:drawable="@color/white"></item>

</selector>

下面是页面传值
main4.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <EditText
        android:id="@+id/editText"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <Button
        android:id="@+id/send"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="发送" />
    
    <fragment 
        android:id="@+id/frag"
        android:name="com.example.android_fragment.MyFragment"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        />

</LinearLayout>

MainActivity4.java

package com.example.android_fragment;

import com.example.android_fragment.MyFragment5.MyListener;

import android.app.Activity;
import android.app.Fragment;
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;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity4 extends Activity implements MyListener {

    private EditText editext;
    private Button send;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main4);
        editext = (EditText) findViewById(R.id.editText);
        send = (Button) findViewById(R.id.send);
        
        
        send.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                String text = editext.getText().toString();
                MyFragment5 fragment5 = new MyFragment5();
                Bundle bundle = new Bundle();
                bundle.putString("name", text);
                fragment5.setArguments(bundle);
                FragmentManager fragmentManager = getFragmentManager();
                FragmentTransaction beginTransaction = fragmentManager
                        .beginTransaction();
                beginTransaction.add(R.id.layout, fragment5, "fragment5");
                beginTransaction.commit();
                Toast.makeText(MainActivity4.this, "向Fragment发送数据" + text,
                        Toast.LENGTH_SHORT).show();
            }
        }); 
        
        FragmentManager fragmentManager = getFragmentManager();
        Fragment findFragmentById = fragmentManager.findFragmentById(R.id.frag);
        MyFragment frag=(MyFragment) findFragmentById;
        frag.setAaa("fragment静态传值");
    }

    @Override
    public void thank(String code) {
        // TODO Auto-generated method stub
        Toast.makeText(MainActivity4.this, "已成功接收到" + code + "，客气了！",
                Toast.LENGTH_SHORT).show();
    }

}

MyFragment5.java

package com.example.android_fragment;

import android.app.Activity;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.widget.Toast;

public class MyFragment5 extends Fragment{

    private String code="Thank you,Activity!";
    
    public MyListener listener;
    public interface MyListener
    {
        public void thank(String code);
    }
    
    @Override
    public void onAttach(Activity activity) {
        // TODO Auto-generated method stub  
        listener=(MyListener) activity;
        super.onAttach(activity);
    }
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        View view = inflater.inflate(R.layout.fragment2, container, false);
        TextView tv = (TextView) view.findViewById(R.id.text);
        String text=getArguments().get("name")+"";
        tv.setText(text);
        Toast.makeText(getActivity(), "已成功接收到"+text, Toast.LENGTH_SHORT).show();
        Toast.makeText(getActivity(), "向Activity发送"+code, Toast.LENGTH_SHORT).show();
        listener.thank(code);
        return view;
    }
}

效果演示：

fragment.gif

Android Fragment

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