实例讲解Android应用开发中Fragment生命周期的控制

第一种方式虽然简单但灵活性不够。添加Fragment到Activity的布局文件当中,就等同于将Fragment及其视图与activity的视图绑定在一起，且在activity的生命周期过程中，无法切换fragment视图。

第二种方式比较复杂，但也是唯一一种可以在运行时控制fragment的方式（加载、移除、替换）。

二、生命周期控制实例

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);
    }
  }
}

								 
 2/5   首页 上一页 1 2 3 4 5 下一页 尾页