安卓——Fragment

叁歲伎倆 2022-05-30 06:09 357阅读 0赞

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静态加载必须要有一个标识

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Fragament的生命周期

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以下是代码

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
    <manifest xmlns:android="http://schemas.android.com/apk/res/android"
        package="com.example.lenovo.fragment">
    
        <application
            android:allowBackup="true"
            android:icon="@mipmap/ic_launcher"
            android:label="@string/app_name"
            android:roundIcon="@mipmap/ic_launcher_round"
            android:supportsRtl="true"
            android:theme="@style/AppTheme">
            <activity android:name=".MainActivity">
                <intent-filter>
                    <action android:name="android.intent.action.MAIN" />
    
                    <category android:name="android.intent.category.LAUNCHER" />
                </intent-filter>
            </activity>
    
            <activity android:name=".MainActivity2"></activity>
    
            <activity android:name=".MainActivity3"></activity>
    
            <activity android:name=".MainActivity4"></activity>
        </application>
    
    </manifest>

activity\_main.xml

<?xml version="1.0" encoding="UTF-8"?>
    
        <RelativeLayout
        android:layout_height="match_parent"
        android:layout_width="match_parent"
        xmlns:android="http://schemas.android.com/apk/res/android">
    
        <LinearLayout
            android:layout_height="wrap_content"
            android:layout_width="match_parent"
            android:orientation="vertical"
            android:id="@+id/frame">
        </LinearLayout>
    
    
        <RadioGroup android:layout_height="wrap_content"
        android:layout_width="match_parent"
        android:orientation="horizontal"
        android:id="@+id/radiogroup"
        android:gravity="center_horizontal"
        android:layout_alignParentBottom="true">
    
        <RadioButton
            android:layout_height="wrap_content"
            android:layout_width="0dp"
            android:id="@+id/first"
            android:gravity="center_horizontal"
            android:text="静态加载"
            android:drawableTop="@drawable/ic_launcher"
            android:button="@null"
            android:background="@drawable/radio_pressed"
            android:layout_weight="1"
            />
    
        <RadioButton
            android:layout_height="wrap_content"
            android:layout_width="0dp"
            android:id="@+id/second"
            android:gravity="center_horizontal"
            android:text="动态加载"
            android:drawableTop="@drawable/ic_launcher"
            android:button="@null"
            android:background="@drawable/radio_pressed"
            android:layout_weight="1"/>
    
        <RadioButton
            android:layout_height="wrap_content"
            android:layout_width="0dp"
            android:id="@+id/thrid"
            android:gravity="center_horizontal"
            android:text="生命周期"
            android:drawableTop="@drawable/ic_launcher"
            android:button="@null"
            android:background="@drawable/radio_pressed"
            android:layout_weight="1"/>
    
        <RadioButton
            android:layout_height="wrap_content"
            android:layout_width="0dp"
            android:id="@+id/fourth"
            android:gravity="center_horizontal"
            android:text="传值通信"
            android:drawableTop="@drawable/ic_launcher"
            android:button="@null"
            android:background="@drawable/radio_pressed"
            android:layout_weight="1"/>
    
    </RadioGroup>
    
    </RelativeLayout>

fragment.xml

fragment2.xml

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

main3.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" >
    
        <Button
            android:text="切换Fragment"
            android:id="@+id/button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" >
        </Button>
    
    </LinearLayout>

main4.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"
        android:id="@+id/layout"
        >
    
        <EditText
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/editText"
            />
    
        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/send"
            android:text="发送"
            />
    
        <fragment
            android:name="com.example.lenovo.fragment.MyFragment"
            android:id="@+id/frag"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
        />
    
    </LinearLayout>

MainActivity.java

package com.example.lenovo.fragment;
    
    import android.app.Activity;
    import android.app.FragmentManager;
    import android.app.FragmentTransaction;
    import android.content.Intent;
    import android.os.Bundle;
    import android.widget.RadioGroup;
    
    public class MainActivity extends Activity implements RadioGroup.OnCheckedChangeListener{
    
        private RadioGroup group;
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            group=(RadioGroup)findViewById(R.id.radiogroup);
            group.setOnCheckedChangeListener(this);
        }
    
        @Override
        public void onCheckedChanged(RadioGroup radioGroup, int checkedId) {
    
            switch(checkedId)
            {
                case R.id.first:
                    Intent intent=new Intent(this,MainActivity2.class);
                    startActivity(intent);
                    break;
                case R.id.second:
                    MyFragment2 myFragment2=new MyFragment2();
                    FragmentManager fragmentManager=getFragmentManager();
                    FragmentTransaction beginTransaction=fragmentManager.beginTransaction();
                    beginTransaction.add(R.id.frame,myFragment2);
                    beginTransaction.addToBackStack(null);
                    beginTransaction.commit();
                    break;
                case R.id.thrid:
                    Intent intent1=new Intent(this,MainActivity3.class);
                    startActivity(intent1);
                    break;
                case R.id.fourth:
                    Intent intent2=new Intent(this,MainActivity4.class);
                    startActivity(intent2);
                    break;
            }
        }
    }

MainActivity2.java

package com.example.lenovo.fragment;
    
    import android.app.Activity;
    import android.os.Bundle;
    import android.view.View;
    import android.widget.Button;
    import android.widget.TextView;
    
    /**
     * Created by lenovo on 2018/3/6.
     */
    
    public class MainActivity2 extends Activity{
    
        private TextView tv;
        @Override
        protected void onCreate( Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.main2);
            tv=(TextView)findViewById(R.id.text);
            Button button=(Button)findViewById(R.id.button);
            button.setText("改变");
            button.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    tv.setText("TextView值改变了");
                }
            });
        }
    }

MainActivity3.java

package com.example.lenovo.fragment;
    
    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;
    
    public class MainActivity3 extends Activity {
    
    	private Button button;
    	private Fragment frag;
    	private boolean flag = true;
    
    	@Override
    	protected void onCreate(Bundle savedInstanceState) {
    		// TODO Auto-generated method stub
    		super.onCreate(savedInstanceState);
    		setContentView(R.layout.main3);
    		init();
    		button = (Button) findViewById(R.id.button);
    		button.setOnClickListener(new OnClickListener() {
    
    			@Override
    			public void onClick(View v) {
    				// TODO Auto-generated method stub
    				FragmentManager fragmentManager = getFragmentManager();
    				FragmentTransaction beginTransaction = fragmentManager
    						.beginTransaction();
    				
    				if (flag) {
    					MyFragment4 frag4=new MyFragment4();
    					beginTransaction.replace(R.id.layout, frag4);
    					flag=false;
    
    				} else {
    					MyFragment3 frag3=new MyFragment3();
    					beginTransaction.replace(R.id.layout, frag3);
    					flag=true;
    
    				}
    				
    			   beginTransaction.commit();
    			}
    		});
    
    	}
    
    	private void init() {
    		// TODO Auto-generated method stub
    
    		FragmentManager fragmentManager = getFragmentManager();
    		FragmentTransaction beginTransaction = fragmentManager
    				.beginTransaction();
    		MyFragment3 frag3 = new MyFragment3();
    		beginTransaction.add(R.id.layout,frag3);
    		beginTransaction.commit();
    	}
    
    }

MainActivity4.java

package com.example.lenovo.fragment;
    
    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.widget.Button;
    import android.widget.EditText;
    import android.widget.Toast;
    
    /**
     * Created by lenovo on 2018/3/6.
     */
    
    public class MainActivity4 extends Activity implements MyFragment5.MyListener{
    
        private EditText editText;
        private Button send;
        @Override
        protected void onCreate( Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.main4);
            editText=(EditText)findViewById(R.id.editText);
            send=(Button)findViewById(R.id.send);
    
            send.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
    
                    String text=editText.getText().toString();
                    MyFragment5 myFragment5=new MyFragment5();
                    Bundle bundle = new Bundle();
                    bundle.putString("name",text);
                    myFragment5.setArguments(bundle);
                    FragmentManager fragmentManager=getFragmentManager();
                    FragmentTransaction beginTransaction=fragmentManager.beginTransaction();
                    beginTransaction.add(R.id.layout,myFragment5,"myFragment5");
                    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) {
    
            Toast.makeText(MainActivity4.this,"Fragment说"+code,Toast.LENGTH_SHORT).show();
    
        }
    }

MyFragment.java

package com.example.lenovo.fragment;
    
    import android.app.Fragment;
    import android.os.Bundle;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.Button;
    import android.widget.TextView;
    import android.widget.Toast;
    
    /**
     * Created by lenovo on 2018/3/6.
     */
    
    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) {
    
            //layout文件转化成布局对象
    
            /*
            inflate()参数解释
            1.resource:Fragment需要加载的布局文件
            2.root:加载Layout的父ViewGroup
            3.attachToRoot:true:把父ViewGroup也返回过来
             */
           View view= inflater.inflate(R.layout.fragment,container,false);
           //必须加上view.
            TextView text=(TextView)view.findViewById(R.id.text);
            text.setText("静态加载Fragment");
            Button button=(Button)view.findViewById(R.id.button);
            button.setText("获取内容");
            button.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    String value=getAaa();
                    Toast.makeText(getActivity(),"value="+value,Toast.LENGTH_SHORT).show();
                }
            });
           return view;
        }
    }

MyFragment2.java

package com.example.lenovo.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;
    
    /**
     * Created by lenovo on 2018/3/6.
     */
    
    public class MyFragment2 extends Fragment{
    
        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    
            //layout文件转化成布局对象
    
            /*
            inflate()参数解释
            1.resource:Fragment需要加载的布局文件
            2.root:加载Layout的父ViewGroup
            3.attachToRoot:true:把父ViewGroup也返回过来
             */
           View view= inflater.inflate(R.layout.fragment,container,false);
           //必须加上view.
            TextView text=(TextView)view.findViewById(R.id.text);
            text.setText("动态加载Fragment");
           return view;
        }
    }

MyFragment.3java

package com.example.lenovo.fragment;
    
    import android.app.Activity;
    import android.app.Fragment;
    import android.os.Bundle;
    import android.util.Log;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.TextView;
    
    public class MyFragment3 extends Fragment {
    
    	private TextView tv;
    
    	// 启动Fragment——>屏幕锁屏——>屏幕解锁——>
    	//切换到其他的Fragment——>回到桌面——>回到应用——>退出Fragment
    	/**
    	 * 每次创建都会绘制Fragment的View组件时回调该方法
    	 */
    	@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);
    		tv.setText("第一个Fragment");
    		Log.i("Main", "Fragment1---onCreateView()");
    		return view;
    	}
    
    	/**
    	 * 当Fragment被添加到Activity时候会回调这个方法，并且只调用一次
    	 */
    	@Override
    	public void onAttach(Activity activity) {
    		// TODO Auto-generated method stub
    		super.onAttach(activity);
    		Log.i("Main", "Fragment1---onAttach()");
    
    	}
    
    	/**
    	 * 创建Fragment时会回调，只会调用一次
    	 */
    	@Override
    	public void onCreate(Bundle savedInstanceState) {
    		// TODO Auto-generated method stub
    		super.onCreate(savedInstanceState);
    		Log.i("Main", "Fragment1---onCreate()");
    
    	}
    
    	/**
    	 * 当Fragment所在的Activty启动完成后调用
    	 */
    	@Override
    	public void onActivityCreated(Bundle savedInstanceState) {
    		// TODO Auto-generated method stub
    		super.onActivityCreated(savedInstanceState);
    		Log.i("Main", "Fragment1---onActivityCreated()");
    
    	}
    
    	/**
    	 * 启动Fragment
    	 * 
    	 */
    	@Override
    	public void onStart() {
    		// TODO Auto-generated method stub
    		super.onStart();
    		Log.i("Main", "Fragment1---onStart()");
    
    	}
    
    	/**
    	 * 恢复Fragment时会被回调，调用onStart（）方法后面一定会调用onResume()方法
    	 */
    	@Override
    	public void onResume() {
    		// TODO Auto-generated method stub
    		super.onResume();
    		Log.i("Main", "Fragment1---onResume()");
    
    	}
    
    	/**
    	 * 暂停Fragment
    	 */
    	@Override
    	public void onPause() {
    		// TODO Auto-generated method stub
    		super.onPause();
    		Log.i("Main", "Fragment1---onPause()");
    
    	}
    
    	/**
    	 * 停止Fragment
    	 */
    	@Override
    	public void onStop() {
    		// TODO Auto-generated method stub
    		super.onStop();
    		Log.i("Main", "Fragment1---onStop()");
    
    	}
    
    	/**
    	 * 销毁Fragment所包含的View组件时
    	 */
    	@Override
    	public void onDestroyView() {
    		// TODO Auto-generated method stub
    		super.onDestroyView();
    		Log.i("Main", "Fragment1---onDestroyView()");
    
    	}
    
    	/**
    	 * 销毁Fragment时会被回调
    	 */
    	@Override
    	public void onDestroy() {
    		// TODO Auto-generated method stub
    		super.onDestroy();
    		Log.i("Main", "Fragment1---onDestroy()");
    
    	}
    
    	/**
    	 * Fragment从Activity中删除时会回调该方法，并且这个方法只会调用一次
    	 */
    	@Override
    	public void onDetach() {
    		// TODO Auto-generated method stub
    		super.onDetach();
    		Log.i("Main", "Fragment1---onDetach()");
    	}
    }

MyFragment.4java

package com.example.lenovo.fragment;
    
    import android.app.Activity;
    import android.app.Fragment;
    import android.os.Bundle;
    import android.util.Log;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.TextView;
    
    public class MyFragment4 extends Fragment {
    
    	private TextView tv;
    
    	@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);
    		tv.setText("第二个Fragment");
    		Log.i("Main", "Fragment2---onCreateView()");
    		return view;
    	}
    
    	@Override
    	public void onAttach(Activity activity) {
    		// TODO Auto-generated method stub
    		super.onAttach(activity);
    		Log.i("Main", "Fragment2---onAttach()");
    	
    	}
    
    	@Override
    	public void onCreate(Bundle savedInstanceState) {
    		// TODO Auto-generated method stub
    		super.onCreate(savedInstanceState);
    		Log.i("Main", "Fragment2---onCreate()");
    
    	}
    
    	@Override
    	public void onActivityCreated(Bundle savedInstanceState) {
    		// TODO Auto-generated method stub
    		super.onActivityCreated(savedInstanceState);
    		Log.i("Main", "Fragment2---onActivityCreated()");
    	
    	}
    
    	@Override
    	public void onStart() {
    		// TODO Auto-generated method stub
    		super.onStart();
    		Log.i("Main", "Fragment2---onStart()");
    	
    	}
    
    	@Override
    	public void onResume() {
    		// TODO Auto-generated method stub
    		super.onResume();
    		Log.i("Main", "Fragment2---onResume()");
    		
    	}
    	
    	@Override
    	public void onPause() {
    		// TODO Auto-generated method stub
    		super.onPause();
    		Log.i("Main", "Fragment2---onPause()");
    	
    	}
    	
    	@Override
    	public void onStop() {
    		// TODO Auto-generated method stub
    		super.onStop();
    		Log.i("Main", "Fragment2---onStop()");
    		
    	}
    	
    	@Override
    	public void onDestroyView() {
    		// TODO Auto-generated method stub
    		super.onDestroyView();
    		Log.i("Main", "Fragment2---onDestroyView()");
    
    	}
    	
    	@Override
    	public void onDestroy() {
    		// TODO Auto-generated method stub
    		super.onDestroy();
    		Log.i("Main", "Fragment2---onDestroy()");
    	
    	}
    	
    	@Override
    	public void onDetach() {
    		// TODO Auto-generated method stub
    		super.onDetach();
    		Log.i("Main", "Fragment2---onDetach()");
    	}
    }

MyFragment5.java

package com.example.lenovo.fragment;
    
    import android.app.Activity;
    import android.app.Fragment;
    import android.app.FragmentManager;
    import android.app.FragmentTransaction;
    import android.content.Context;
    import android.os.Bundle;
    import android.util.Log;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.TextView;
    import android.widget.Toast;
    
    /**
     * Created by lenovo on 2018/3/6.
     */
    
    public class MyFragment5 extends Fragment {
    
        private  String code="Thank you,Activity!";
    
        public interface MyListener{
            public void thank(String code);
        }
    
        private  MyListener myListener;
    
        @Override
        public void onAttach(Activity activity) {
    
            myListener=(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(),"我已经接受到了来自Activity的信息:"+text,Toast.LENGTH_SHORT).show();
            myListener.thank(code);
            return view;
        }
    }

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