fragment的使用总结

fragment用于动态显示页面，是activity的更灵活的子类。相当于Activity中嵌入”小Activity”，然后每个”小Activity”又可以拥有自己的布局。可替代tabhost分页显示。

首先，在布局中设定一个framlayout：

 

<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
   
    tools:context="com.example.fragmenttest.MainActivity">
 
    <LinearLayout
        android:id="@+id/left_layout"
        android:layout_width="0dp"
        android:layout_weight="1"
        android:layout_height="fill_parent"
        android:orientation="vertical">
       
        <fragment
            android:id="@+id/left_fragment"
            android:name="com.example.fragmenttest.LeftFragment"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"/>
 
    </LinearLayout>
   
    <FrameLayout

        android:id="@+id/right_layout"
        android:layout_width="0dp"
        android:layout_weight="2"
        android:layout_height="fill_parent">
            
    </FrameLayout> 

</LinearLayout>
该framelayout用于实现fragment的显示，接下来可通过按键来模拟2个fragment的切换显示

rightFragment =
new RightFragment();
        anotherFragment =
new AnotherFragment();
       
        leftButton1.setOnClickListener(new OnClickListener() {
           
            @Override
            publicvoid onClick(View v) {
                //
TODO Auto-generated method stub
                Toast.makeText(getActivity(),"left button1", Toast.LENGTH_SHORT).show();
                FragmentManager manager =getFragmentManager();
                FragmentTransaction transaction= manager.beginTransaction();
               
//              transaction.replace(R.id.right_layout,rightFragment);
//              transaction.addToBackStack(null);
                if (!rightFragment.isAdded()) {
                    transaction.add(R.id.right_layout,
rightFragment);
                }
                if (anotherFragment.isVisible()) {
                    transaction.hide(anotherFragment);
                }
                transaction.show(rightFragment);
                transaction.commit();
            }
        });
       
        leftButton2.setOnClickListener(new OnClickListener() {
           
            @Override
            publicvoid onClick(View v) {
                //
TODO Auto-generated method stub
                Toast.makeText(getActivity(),"left button2", Toast.LENGTH_SHORT).show();
                FragmentManager manager =getFragmentManager();
                FragmentTransaction transaction= manager.beginTransaction();
               
//              transaction.replace(R.id.right_layout,anotherFragment);
//              transaction.addToBackStack(null);
               
                if (!anotherFragment.isAdded()) {
                    transaction.add(R.id.right_layout,
anotherFragment);
                }
                if (rightFragment.isVisible()) {
                    transaction.hide(rightFragment);
                }
                transaction.show(anotherFragment);
                transaction.commit();
               
            }
        });