Android应用UI开发中Fragment的常见用法小结

public View onCreateView(LayoutInflater inflater, ViewGroup container, 
  Bundle savedInstanceState) { 
 View view = inflater.inflate(R.layout.list, null); 
 return view; 
} 

<&＃63;xml version="1.0" encoding="utf-8"&＃63;> 
 
 
  
  
 
 

manager = getFragmentManager(); 
if(manager.findFragmentByTag("right") == null){ 
 manager.beginTransaction().replace(R.id.right, new RightFrag(), "right").commit(); 
} 

manager.beginTransaction() 
 .replace(R.id.right, new RightFrag(), "right")//在事务中指明该fragment的tag 
.commit(); 

Fragment fragment = getFragmentManager().findFragmentByTag("right"); 
//or 
Fragment fragment = getFragmentManager().findFragmentById(id); 

manager.addOnBackStackChangedListener(new FragmentManager.OnBackStackChangedListener() { 
 @Override 
 public void onBackStackChanged() { 
  Toast.makeText(MainActivity.this, "返回堆状态发生改变", 1).show(); 
 } 
}); 

/* 
 * 通过manager开启一个事务，该事务包含一些操作的集合，通事务可以 add(), remove(), replace() 
 * 完成对Fragment的操作，并使用commit()提交 
 */ 
FragmentTransaction transaction = manager.beginTransaction(); 
 
transaction.replace(R.id.right, new RightFrag(), "right"); 
transaction.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);//设置动画 
transaction.addToBackStack("right"); // 将该fragment加入返回堆 
// 提交事务 
transaction.commit(); 

/* 
 * 管理Fragment的状态 
 * 如果在一个主activityViewGroup中添加一个fragment， 
 * 如果手机屏幕旋转了，当前activity被销毁重建，fragment也被activityManager创建 
 * 故在onCreate中，需要判断一下 
 */ 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
 super.onCreate(savedInstanceState); 
 setContentView(R.layout.activity_main); 
 manager = getFragmentManager(); 
 if (manager.findFragmentByTag("right") == null) { 
  // if(savedInstanceState == null)也可判断该fragment是否已经加载 
 
  manager.beginTransaction() 
   .replace(R.id.right, new RightFrag(), "right") 
   .setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN)// 设置动画 
   .addToBackStack("right") // 将该fragment加入返回堆 
  // 提交事务 
  .commit(); 
 } 
} 

/* 
 * 点击该Fragment的button按钮，将该button的text设置为另一个fragment中Edittext的文本值 
 */ 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
  Bundle savedInstanceState) { 
 View view = inflater.inflate(R.layout.list, null); 
 final Button button = (Button) view.findViewById(R.id.confirm); 
 button.setOnClickListener(new View.OnClickListener() { 
   
  @Override 
  public void onClick(View v) { 
   //通过FragmentManager找到另一个fragment中的edittext对象，并取得text内容 
   EditText editText = (EditText)(getFragmentManager().findFragmentByTag("left").getView().findViewById(R.id.name)); 
   button.setText(editText.getText().toString()); 
  } 
 }); 
 return view; 
} 

public class MainActivity extends Activity { 
 private FragmentManager manager; 
 private Button button; 
 
 @Override 
 protected void onCreate(Bundle savedInstanceState) { 
  super.onCreate(savedInstanceState); 
  setContentView(R.layout.activity_main); 
   
  button.setOnClickListener(new View.OnClickListener() { 
   @Override 
   public void onClick(View v) { 
    RightFragment rightFrag = (RightFragment) (getFragmentManager().findFragmentByTag("right")); 
    /* 
     * 通过set方法，向其传递一个实例化对象，由于rightFrag.set()方法内部执行RightFragment.CallBack.get()方法，完成了参数的传递 
     */ 
    rightFrag.set(new RightFragment.CallBack() { 
     @Override 
     public void get(String str) { 
      button.setText(str); 
     } 
    }); 
   } 
  }); 
 } 
 
} 

public class RightFragment extends ListFragment { 
 private LoaderManager manager; 
 
 @Override 
 public void onCreate(Bundle savedInstanceState) { 
  super.onCreate(savedInstanceState); 
  manager = getLoaderManager(); 
 } 
 
 /* 
  * 点击该Fragment的button按钮，将该button的text设置为另一个fragment中Edittext的文本值 
  */ 
 public View onCreateView(LayoutInflater inflater, ViewGroup container, 
   Bundle savedInstanceState) { 
  View view = inflater.inflate(R.layout.list, null); 
  return view; 
 } 
 
 /** 
  * 通过调用该方法，接收一个回掉函数对象，callBack.get(str); 
  * @param callBack 
  */ 
 public void set(CallBack callBack) { 
  EditText editText = (EditText) getView().findViewById(R.id.name); 
  callBack.get(editText.getText().toString()); 
 } 
 
 /* 
  * 回掉接口 
  */ 
 interface CallBack { 
  public void get(String str); 
 } 
} 

FragmentManager fragmentManager = getFragmentManager(); 
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();

// Create new fragment and transaction 

Fragment newFragment = new ExampleFragment(); 

FragmentTransaction transaction = getFragmentManager().beginTransaction(); 

 // Replace whatever is in the fragment_container view with this fragment, 

// and add the transaction to the back stack transaction.replace(R.id.fragment_container, newFragment); transaction.addToBackStack(null); 

// Commit the transaction transaction.commit();