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 Android教程網 >> Android技術 >> 關於Android編程 >> Android——Fragment和Activity之間的通信+Frangment生命周期

Android——Fragment和Activity之間的通信+Frangment生命周期

編輯：關於Android編程

Fr'agment和Activity之間的通信

1.在Fragment中聲明一個接口。

2.在Activity中實現在Fargment中聲明的接口。

3.在Fragment中聲明一個接口對象。

4.在Frangment的生命周期Onattach方法中判斷當前Activity是否實現了此Fragment中聲明的接口。如果已實現，就把當前Activity轉換成接口對象。

5.調用Activity中實現的方法=>（接口對象.方法名）

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package com.example.jreduch05;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.app.AppCompatActivity;

import com.example.jreduch05.fragment.FirstFragment;
import com.example.jreduch05.fragment.LeftFragment;
import com.example.jreduch05.fragment.SecondFragment;

public class Fragment1Activity extends AppCompatActivity implements LeftFragment.OnFragmentInteractionListener{
    private Fragment fragment1;
    private Fragment fragment2;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_fragment1);
        getSupportActionBar().hide();
    }

    @Override
    public void changeFragment(int which) {
        if (which==1){
            fragment1=new FirstFragment();
            getSupportFragmentManager()
                    .beginTransaction()
                    .replace(R.id.fl,fragment1)
                    .commit();
        }else  if (which==2){
            fragment2=new SecondFragment();
            getSupportFragmentManager()
                    .beginTransaction()
                    .replace(R.id.fl,fragment2)
                    .commit();
        }
        else  if (which==3){
            if(fragment2!=null && !fragment2.isHidden()){
                getSupportFragmentManager().beginTransaction()
                        .hide(fragment2).commit();
            }

        }
        else  if (which==4){
            if(fragment2!=null && fragment2.isHidden()){
                getSupportFragmentManager().beginTransaction()
                        .show(fragment2).commit();
            }
        }
    }
}




    
    
        
        
        
        
        
        

    <framelayout android:id="@+id/fl" android:layout_below="@+id/top" android:layout_height="match_parent" android:layout_toendof="@+id/left" android:layout_width="match_parent">

    </framelayout>
LeftFragment 
package com.example.jreduch05.fragment;


import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;

import com.example.jreduch05.R;

/**
 * A simple {@link Fragment} subclass.
 */
public class LeftFragment extends Fragment {
private Fragment fragment1;
    private Fragment fragment2;
    private OnFragmentInteractionListener mListener;
    public LeftFragment() {
        // Required empty public constructor
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
      View view= inflater.inflate(R.layout.fragment_left2, container, false);
        Button bt1=(Button)view.findViewById(R.id.bt1);
        Button bt2=(Button)view.findViewById(R.id.bt2);
        Button bt3=(Button)view.findViewById(R.id.bt3);
        Button bt4=(Button)view.findViewById(R.id.bt4);
        Button bt5=(Button)view.findViewById(R.id.bt5);
        Button bt6=(Button)view.findViewById(R.id.bt6);
        Button bt7=(Button)view.findViewById(R.id.bt7);
        Button bt8=(Button)view.findViewById(R.id.bt8);
        bt1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                //Toast.makeText(getContext(),"點擊按鈕1",Toast.LENGTH_SHORT).show();
                fragment1=new FirstFragment();
                FragmentManager fm=getFragmentManager();
                FragmentTransaction fr=fm.beginTransaction();   //開始

                fr.replace(R.id.fl,fragment1);  //替換
                fr.commit();//提交一個事物
            }
        });
        bt2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                //Toast.makeText(getContext(),"點擊按鈕1",Toast.LENGTH_SHORT).show();
               fragment2=new SecondFragment();
                FragmentManager fm=getFragmentManager();
                FragmentTransaction fr=fm.beginTransaction();   //開始

                fr.replace(R.id.fl,fragment2);  //替換
                fr.commit();//提交一個事物
            }
        });
        bt3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                mListener.changeFragment(1);
            }
        });
        bt4.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                mListener.changeFragment(2);
            }
        });
        bt5.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(fragment1!=null && !fragment1.isHidden()){
                    getFragmentManager().beginTransaction()
                            .hide(fragment1).commit();
                }
            }
        });
        bt6.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(fragment1!=null && fragment1.isHidden()){
                    getFragmentManager().beginTransaction()
                            .show(fragment1).commit();
                }
            }
        });
        bt7.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mListener.changeFragment(3);

            }
        });
        bt8.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mListener.changeFragment(4);
            }
        });

        return  view;
    }
    public interface OnFragmentInteractionListener {
        // TODO: Update argument type and name
        void changeFragment(int which);
    }
    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        if (context instanceof OnFragmentInteractionListener) {
            mListener = (OnFragmentInteractionListener) context;
        } else {
            throw new RuntimeException(context.toString()
                    + " must implement OnFragmentInteractionListener");
        }
    }
}

<framelayout android:background="#0c04f7" android:layout_height="match_parent" android:layout_width="match_parent" tools:context="com.example.jreduch05.fragment.LeftFragment" xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools">

    
    
        
        
        
        
        
        
        
    </framelayout>

FirstFragment

package com.example.jreduch05.fragment;


import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import com.example.jreduch05.R;

/**
 * A simple {@link Fragment} subclass.
 */
public class FirstFragment extends Fragment {


    public FirstFragment() {
        // Required empty public constructor
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_first, container, false);
    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        Bundle bundle=getArguments();
        if(bundle!=null){
          int ch= bundle.getInt("channel") ;
            TextView tv= (TextView) getView().findViewById(R.id.tv);
            tv.setText(ch+"");
        }
    }
}


<framelayout android:layout_height="match_parent" android:layout_width="match_parent" tools:context="com.example.jreduch05.fragment.FirstFragment" xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools">

    
    

</framelayout>

SecondFragment

package com.example.jreduch05.fragment;


import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.example.jreduch05.R;

/**
 * A simple {@link Fragment} subclass.
 */
public class SecondFragment extends Fragment {


    public SecondFragment() {
        // Required empty public constructor
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_second, container, false);
    }

}

<framelayout android:layout_height="match_parent" android:layout_width="match_parent" tools:context="com.example.jreduch05.fragment.SecondFragment" xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools">

    
    
</framelayout>
MainFragment
package com.example.jreduch05.fragment;


import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.example.jreduch05.R;

/**
 * A simple {@link Fragment} subclass.
 */
public class MainFragment extends Fragment {


    public MainFragment() {
        // Required empty public constructor
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_main, container, false);
    }

}

<framelayout android:layout_height="match_parent" android:layout_width="match_parent" tools:context="com.example.jreduch05.fragment.MainFragment" xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools">

    
    
</framelayout>
TopFargment

 

package com.example.jreduch05.fragment;


import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.example.jreduch05.R;

/**
 * A simple {@link Fragment} subclass.
 */
public class TopFragment extends Fragment {


    public TopFragment() {
        // Required empty public constructor
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_top, container, false);
    }

}

<framelayout android:layout_height="match_parent" android:layout_width="match_parent" tools:context="com.example.jreduch05.fragment.TopFragment" xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools">

    
    

</framelayout>
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Frangment生命周期

\
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方法名 說明
onAttach() Fragment被附加到Activity的時，調用此函數，在這個方法中可以獲得宿主Activity。
onCreate() Fragment被創建的時，調用此函數。
onCreateView() Fragment的布局加載時，調用此函數。
onActivityCreated() 當宿主Activity啟動完畢後，調用此函數。
onStart() 啟動Fragment時，調用此函數。
onResume() Fragment恢復時，調用此函數。
onPause() Fragment暫停時，調用此函數。
onStop() Fragment停止時，調用此函數。
onDestroyView() 銷毀Fragment中的View控件時，調用此函數。
onDestroy() 銷毀Fragment時，調用此函數。
onDetach() Fragment從Activity脫離時，調用此函數

啟動

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Remove

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回退

\

3鍵

\

 

package com.example.jreduch05;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;

import com.example.jreduch05.fragment.FirstFragment;
import com.example.jreduch05.fragment.LifeFragment;

public class FragmentLifeActivity extends AppCompatActivity {

    //private Fragment fragment;
    private Fragment fragment2;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_fragment_life);
       final Fragment fragment=new LifeFragment();

        Button bt1=(Button)findViewById(R.id.bt_remove);
        Button bt2=(Button)findViewById(R.id.bt_replace);
        Button bt3=(Button)findViewById(R.id.bt_hide);
        Button bt4=(Button)findViewById(R.id.bt_show);
        Button bt5=(Button)findViewById(R.id.bt_remrep);
        bt1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (fragment!=null){
                    getSupportFragmentManager().beginTransaction()
                            .remove(fragment).commit();
                }
            }
        });

        bt2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (fragment!=null){
                    fragment2=new FirstFragment();


                    Bundle bundle=new Bundle();
                    bundle.putInt("channel",1261911);
                    fragment2.setArguments(bundle);



                    getSupportFragmentManager().beginTransaction()
                            .replace(R.id.life_frame, fragment2).commit();
                }
            }
        });
        bt3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (fragment!=null&&!fragment.isHidden()){
                    getSupportFragmentManager().beginTransaction()
                            .hide(fragment).commit();
                }
            }
        });
        bt4.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (fragment!=null&&fragment.isHidden()){
                    getSupportFragmentManager().beginTransaction()
                            .show(fragment).commit();
                }
            }
        });
        bt5.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (fragment2!=null){
                    getSupportFragmentManager().beginTransaction()
                            .remove(fragment2).commit();
                }
            }
        });
        getSupportFragmentManager()
                .beginTransaction()
                .replace(R.id.life_frame, fragment)
                .commit();
        Log.d("====Activity==", "onCreate");

    }

    @Override
    protected void onStart() {
        super.onStart();
        Log.d("====Activity==", "onStart");
    }

    @Override
    protected void onRestart() {
        super.onRestart();
        Log.d("====Activity==", "onRestart");
    }

    @Override
    protected void onResume() {
        super.onResume();
        Log.d("====Activity==", "onRestart");
    }

    @Override
    protected void onPause() {
        super.onPause();
        Log.d("====Activity==", "onPause");
    }

    @Override
    protected void onStop() {
        super.onStop();
        Log.d("====Activity==", "onStop");
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        Log.d("====Activity==", "onDestroy");
    }
}
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