欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页

Fragment生命周期

程序员文章站 2022-06-08 11:06:39
...

主要看两张图,和跑代码

一,Fragment的生命周 

          Fragment生命周期

二,与Activity生命周期的对比

     Fragment生命周期

 

package com.goso.testapp;

import android.app.Activity;
import android.app.ListFragment;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListView;

/**
 * Demonstration of using ListFragment to show a list of items
 * from a canned array.
 */
public class FragmentListArray extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Log.e("HJJ", "Activity &&&& onCreate...");
        // Create the list fragment and add it as our sole content.
        if (getFragmentManager().findFragmentById(android.R.id.content) == null) {
            ArrayListFragment list = new ArrayListFragment();
            getFragmentManager().beginTransaction().add(android.R.id.content, list).commit();
        }
    }

    @Override
    protected void onStart() {
    	// TODO Auto-generated method stub
    	super.onStart();
    	Log.e("HJJ", "Activity &&&& onStart...");
    }
    
    @Override
    protected void onResume() {
    	// TODO Auto-generated method stub
    	super.onResume();
    	Log.e("HJJ", "Activity &&&& onResume...");
    }
    
    @Override
    protected void onStop() {
    	// TODO Auto-generated method stub
    	super.onStop();
    	Log.e("HJJ", "Activity &&&& onStop...");
    }
    
    @Override
    protected void onPause() {
    	// TODO Auto-generated method stub
    	super.onPause();
    	Log.e("HJJ", "Activity &&&& onPause...");
    }
    
    @Override
    protected void onDestroy() {
    	// TODO Auto-generated method stub
    	super.onDestroy();
    	Log.e("HJJ", "Activity &&&& onDestroy...");
    }
    
    public static class ArrayListFragment extends ListFragment {

    	@Override
    	public void onAttach(Activity activity) {
    		// TODO Auto-generated method stub
    		Log.e("HJJ", "ArrayListFragment **** onAttach...");
    		super.onAttach(activity);
    	}
    	
    	@Override
    	public void onCreate(Bundle savedInstanceState) {
    		// TODO Auto-generated method stub
    		Log.e("HJJ", "ArrayListFragment **** onCreate...");
    		super.onCreate(savedInstanceState);
    	}
    	
    	@Override
    	public View onCreateView(LayoutInflater inflater, ViewGroup container,
    			Bundle savedInstanceState) {
    		// TODO Auto-generated method stub
    		Log.e("HJJ", "ArrayListFragment **** onCreateView...");
    		return super.onCreateView(inflater, container, savedInstanceState);
    	}
    	
        @Override
        public void onActivityCreated(Bundle savedInstanceState) {
            super.onActivityCreated(savedInstanceState);
            Log.e("HJJ", "ArrayListFragment **** onActivityCreated...");
            String[] array = new String[]{"C++", "JAVA", "PYTHON"};
            setListAdapter(new ArrayAdapter<String>(getActivity(),
                    android.R.layout.simple_list_item_1, array));
        }

        @Override
        public void onStart() {
        	// TODO Auto-generated method stub
        	Log.e("HJJ", "ArrayListFragment **** onStart...");
        	super.onStart();
        }
        
        @Override
        public void onResume() {
        	Log.e("HJJ", "ArrayListFragment **** onResume...");
        	// TODO Auto-generated method stub
        	super.onResume();
        }
        
        @Override
        public void onPause() {
        	Log.e("HJJ", "ArrayListFragment **** onPause...");
        	// TODO Auto-generated method stub
        	super.onPause();
        }
        
        @Override
        public void onStop() {
        	Log.e("HJJ", "ArrayListFragment **** onStop...");
        	// TODO Auto-generated method stub
        	super.onStop();
        }
        
        @Override
        public void onDestroyView() {
        	Log.e("HJJ", "ArrayListFragment **** onDestroyView...");
        	// TODO Auto-generated method stub
        	super.onDestroyView();
        }
        
        @Override
        public void onDestroy() {
        	// TODO Auto-generated method stub
        	Log.e("HJJ", "ArrayListFragment **** onDestroy...");
        	super.onDestroy();
        }
        
        @Override
        public void onDetach() {
        	Log.e("HJJ", "ArrayListFragment **** onDetach...");
        	// TODO Auto-generated method stub
        	super.onDetach();
        }
        
        @Override
        public void onListItemClick(ListView l, View v, int position, long id) {
            Log.i("FragmentList", "Item clicked: " + id);
        }
    }
}

  

结果:

onCreate过程
01-22 15:30:28.091: E/HJJ(10315): Activity &&&& onCreate...
01-22 15:30:28.091: E/HJJ(10315): ArrayListFragment **** onAttach...
01-22 15:30:28.091: E/HJJ(10315): ArrayListFragment **** onCreate...
01-22 15:30:28.115: E/HJJ(10315): ArrayListFragment **** onCreateView...
01-22 15:30:28.123: E/HJJ(10315): ArrayListFragment **** onActivityCreated...

onStart过程
01-22 15:30:28.123: E/HJJ(10315): Activity &&&& onStart...
01-22 15:30:28.123: E/HJJ(10315): ArrayListFragment **** onStart...

onResume过程
01-22 15:30:28.123: E/HJJ(10315): Activity &&&& onResume...
01-22 15:30:28.123: E/HJJ(10315): ArrayListFragment **** onResume...

onPause过程
01-22 15:31:26.748: E/HJJ(10315): ArrayListFragment **** onPause...
01-22 15:31:26.748: E/HJJ(10315): Activity &&&& onPause...

onStop过程
01-22 15:31:27.638: E/HJJ(10315): ArrayListFragment **** onStop...
01-22 15:31:27.638: E/HJJ(10315): Activity &&&& onStop...

onStart过程
01-22 15:31:57.537: E/HJJ(10315): Activity &&&& onStart...
01-22 15:31:57.537: E/HJJ(10315): ArrayListFragment **** onStart...

onResume过程
01-22 15:31:57.537: E/HJJ(10315): Activity &&&& onResume...
01-22 15:31:57.537: E/HJJ(10315): ArrayListFragment **** onResume...

onPause过程
01-22 15:32:47.412: E/HJJ(10315): ArrayListFragment **** onPause...
01-22 15:32:47.412: E/HJJ(10315): Activity &&&& onPause...

onStop过程
01-22 15:32:47.865: E/HJJ(10315): ArrayListFragment **** onStop...
01-22 15:32:47.865: E/HJJ(10315): Activity &&&& onStop...

onDestroy过程
01-22 15:32:47.865: E/HJJ(10315): ArrayListFragment **** onDestroyView...
01-22 15:32:47.865: E/HJJ(10315): ArrayListFragment **** onDestroy...
01-22 15:32:47.865: E/HJJ(10315): ArrayListFragment **** onDetach...
01-22 15:32:47.865: E/HJJ(10315): Activity &&&& onDestroy...

 

 

场景演示 : 切换到该Fragment

11-29 14:26:35.095: D/AppListFragment(7649): onAttach
11-29 14:26:35.095: D/AppListFragment(7649): onCreate
11-29 14:26:35.095: D/AppListFragment(7649): onCreateView
11-29 14:26:35.100: D/AppListFragment(7649): onActivityCreated
11-29 14:26:35.120: D/AppListFragment(7649): onStart
11-29 14:26:35.120: D/AppListFragment(7649): onResume

屏幕灭掉:

11-29 14:27:35.185: D/AppListFragment(7649): onPause
11-29 14:27:35.205: D/AppListFragment(7649): onSaveInstanceState
11-29 14:27:35.205: D/AppListFragment(7649): onStop

 

屏幕解锁

11-29 14:33:13.240: D/AppListFragment(7649): onStart
11-29 14:33:13.275: D/AppListFragment(7649): onResume

 

切换到其他Fragment:
11-29 14:33:33.655: D/AppListFragment(7649): onPause
11-29 14:33:33.655: D/AppListFragment(7649): onStop
11-29 14:33:33.660: D/AppListFragment(7649): onDestroyView

 

切换回本身的Fragment:

11-29 14:33:55.820: D/AppListFragment(7649): onCreateView
11-29 14:33:55.825: D/AppListFragment(7649): onActivityCreated
11-29 14:33:55.825: D/AppListFragment(7649): onStart
11-29 14:33:55.825: D/AppListFragment(7649): onResume

回到桌面

11-29 14:34:26.590: D/AppListFragment(7649): onPause
11-29 14:34:26.880: D/AppListFragment(7649): onSaveInstanceState
11-29 14:34:26.880: D/AppListFragment(7649): onStop

回到应用

11-29 14:36:51.940: D/AppListFragment(7649): onStart
11-29 14:36:51.940: D/AppListFragment(7649): onResume

 

退出应用

11-29 14:37:03.020: D/AppListFragment(7649): onPause
11-29 14:37:03.155: D/AppListFragment(7649): onStop
11-29 14:37:03.155: D/AppListFragment(7649): onDestroyView
11-29 14:37:03.165: D/AppListFragment(7649): onDestroy
11-29 14:37:03.165: D/AppListFragment(7649): onDetach

 

比Activity多了一些生命周期,完整和Activity对接上,大家好好利用。