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java-如何替换片段运行时
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我想在“网格和列表”项的项目单击上用fragment-1上的fragment-1和fragment-2上的fragment添加和替换Frame布局.
我已经创建了main.xml类
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal" >
<LinearLayout
android:layout_width="0dp"
android:layout_weight="1"
android:orientation="vertical"
android:layout_height="fill_parent" >
<fragment
android:id="@+id/fragment1"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
class="com.example.fragment.Fragment1" />
<View
android:layout_width="fill_parent"
android:layout_height="1dp"
android:background="#000000" />
<fragment
android:id="@+id/fragment2"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
class="com.example.fragment.Fragment2" />
</LinearLayout>
<View
android:layout_width="1dp"
android:layout_height="fill_parent"
android:background="#000000" />
<FrameLayout
android:id="@+id/fragment3"
android:layout_width="0dp"
android:layout_height="fill_parent"
android:layout_weight="2"/>
这是我的fragment_1.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:paddingLeft="8dp"
android:paddingRight="8dp" >
<GridView
android:id="@+id/Grid1"
android:layout_width="match_parent"
android:numColumns="auto_fit"
android:columnWidth="100dp"
android:layout_height="0dp"
android:layout_weight="1"
android:drawSelectorOnTop="false" />
这是我的row_fragment1_list.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_margin="15dp"
android:orientation="vertical" >
<ImageView
android:id="@+id/img_view"
android:layout_width="50dp"
android:layout_height="50dp"
android:background="#CCCCCC"
android:textSize="16sp"
android:textStyle="bold" />
<TextView
android:id="@+id/text2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="16sp" />
和fragment_3.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical" >
<TextView
android:id="@+id/tv_fragment3"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textSize="22sp"
android:gravity="center"
android:text="This is 3rd Fragment" />
这是我的Main.xml
public class Main extends Activity
{
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
}
这是Fragment1.class
public class Fragment1 extends Fragment implements OnItemClickListener
{
Activity myActivity;
GridView mGridView;
private String ListItem[] = {"Item 1","Item 2","Item 3","Item 4","Item 5","Item 6","Item 7"};
private int imgID[] = {R.drawable.admin_access_rule,
R.drawable.admin_backup,R.drawable.admin_browsesite,
R.drawable.admin_comment_post,R.drawable.admin_content,
R.drawable.admin_content_type,R.drawable.admin_logout,};
@Override
public void onAttach(Activity activity)
{
super.onAttach(activity);
this.myActivity = activity;
Toast.makeText(activity.getApplicationContext(), "On Attach", Toast.LENGTH_SHORT).show();
}
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
Toast.makeText(myActivity.getApplicationContext(), "On Create", Toast.LENGTH_SHORT).show();
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
Toast.makeText(myActivity.getApplicationContext(), "On Create View", Toast.LENGTH_SHORT).show();
View view = inflater.inflate(R.layout.fragment_1,container, false);
mGridView = (GridView)view.findViewById(R.id.Grid1);
return view;
}
@Override
public void onActivityCreated(Bundle savedInstanceState)
{
Toast.makeText(myActivity.getApplicationContext(), "On Activity Created", Toast.LENGTH_SHORT).show();
super.onActivityCreated(savedInstanceState);
}
@Override
public void onStart()
{
super.onStart();
mGridView.setAdapter(new GridBaseAdapter(myActivity));
mGridView.setOnItemClickListener(this);
}
private class GridBaseAdapter extends BaseAdapter
{
LayoutInflater mLayoutInflater = null;
public GridBaseAdapter(Context mContext)
{
mContext = myActivity;
mLayoutInflater = LayoutInflater.from(mContext);
}
@Override
public int getCount()
{
return ListItem.length;
}
@Override
public Object getItem(int position)
{
return null;
}
@Override
public long getItemId(int position)
{
return ListItem.length;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent)
{
if(convertView == null)
{
convertView = mLayoutInflater.inflate(R.layout.row_fragment_list, null);
}
ImageView mImageView = (ImageView) convertView.findViewById(R.id.img_view);
mImageView.setImageResource(imgID[position]);
TextView tvUserEmail = (TextView) convertView.findViewById(R.id.text2);
tvUserEmail.setText("Sub " +ListItem[position]);
return convertView;
}
}
@Override
public void onItemClick(AdapterView<?> arg0, View view, int position, long id)
{
TextView txt3 = (TextView)myActivity.findViewById(R.id.tv_fragment3);
txt3.setText("1st Fragment's : " + position +" Item Clicked");
}
}
我的Fragment2.class
public class Fragment2 extends ListFragment
{
Activity myActivity;
private String ListItem[] = {"Item 1","Item 2","Item 3","Item 4","Item 5","Item 6","Item 6","Item 7"};
@Override
public void onAttach(Activity activity)
{
super.onAttach(activity);
this.myActivity = activity;
Toast.makeText(activity.getApplicationContext(), "On Attach", Toast.LENGTH_SHORT).show();
}
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
Toast.makeText(myActivity.getApplicationContext(), "On Create", Toast.LENGTH_SHORT).show();
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
Toast.makeText(myActivity.getApplicationContext(), "On Create View", Toast.LENGTH_SHORT).show();
/** Creating an array adapter to store the list of countries **/
ArrayAdapter<String> adapter = new ArrayAdapter<String>(inflater.getContext(), android.R.layout.simple_list_item_1,ListItem);
/** Setting the list adapter for the ListFragment */
setListAdapter(adapter);
return super.onCreateView(inflater, container, savedInstanceState);
}
@Override
public void onActivityCreated(Bundle savedInstanceState)
{
Toast.makeText(myActivity.getApplicationContext(), "On Activity Created", Toast.LENGTH_SHORT).show();
super.onActivityCreated(savedInstanceState);
}
@Override
public void onListItemClick(ListView l, View v, int position, long id)
{
Toast.makeText(myActivity.getApplicationContext(), position +" Item Clicked", Toast.LENGTH_SHORT).show();
TextView txt3 = (TextView)myActivity.findViewById(R.id.tv_fragment3);
txt3.setText("2nd Fragment's : " + position +" Item Clicked");
super.onListItemClick(l, v, position, id);
}
}
最后是我的Fragment3.class
public class Fragment3 extends Fragment
{
Activity myActivity;
TextView txt_view;
@Override
public void onAttach(Activity activity)
{
super.onAttach(activity);
this.myActivity = activity;
Toast.makeText(activity.getApplicationContext(), "On Attach", Toast.LENGTH_SHORT).show();
}
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
Toast.makeText(myActivity.getApplicationContext(), "On Create", Toast.LENGTH_SHORT).show();
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
Toast.makeText(myActivity.getApplicationContext(), "On Create View", Toast.LENGTH_SHORT).show();
View view = inflater.inflate(R.layout.fragment_3,container, false);
txt_view = (TextView)view.findViewById(R.id.tv_fragment3);
return view;
}
@Override
public void onActivityCreated(Bundle savedInstanceState)
{
Toast.makeText(myActivity.getApplicationContext(), "On Activity Created", Toast.LENGTH_SHORT).show();
super.onActivityCreated(savedInstanceState);
}
}
解决方法:
使片段公开活动可以附加到的接口.该事件应在需要时发生(例如,单击列表项).然后,活动应将片段实例放置在应放置的位置,例如:
// fragment is an instance of the fragment you want to show
final FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.fragment3, fragment);
transaction.commit();
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