java-如何替换片段运行时

概述我想在“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<?xmlversion="1.0"encoding="utf-8"?><LinearLayoutxmlns:android="http://schemas.android.com/apkes/android"android:layo

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"         />    <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"         /></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;    }}@OverrIDepublic 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"};@OverrIDepublic voID onAttach(Activity activity) {    super.onAttach(activity);    this.myActivity = activity;    Toast.makeText(activity.getApplicationContext(), "On Attach", Toast.LENGTH_SHORT).show();}@OverrIDepublic voID onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    Toast.makeText(myActivity.getApplicationContext(), "On Create", Toast.LENGTH_SHORT).show();}@OverrIDepublic 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);}@OverrIDepublic voID onActivityCreated(Bundle savedInstanceState) {    Toast.makeText(myActivity.getApplicationContext(), "On Activity Created", Toast.LENGTH_SHORT).show();    super.onActivityCreated(savedInstanceState);}@OverrIDepublic 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;  @OverrIDepublic voID onAttach(Activity activity) {    super.onAttach(activity);    this.myActivity = activity;    Toast.makeText(activity.getApplicationContext(), "On Attach", Toast.LENGTH_SHORT).show();}@OverrIDepublic voID onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    Toast.makeText(myActivity.getApplicationContext(), "On Create", Toast.LENGTH_SHORT).show();}@OverrIDepublic 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;}@OverrIDepublic 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 showfinal FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();transaction.replace(R.ID.fragment3, fragment);transaction.commit();

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