Question

假设我在viewpager中有两个片段，FragmentA和FragmentB。当我点击fragmentA中的按钮时，它应该能够在另一个fragmentB.so中添加textview，怎么可能....请帮帮我

class Myadpter extends FragmentPagerAdapter {
    Fragment fragment =null;
    public Myadpter(FragmentManager fm) {
        super(fm);
    }

    @Override
    public Fragment getItem(int position) {
        if(position==0){
            fragment = new Post();
        }
        if(position==1){
            fragment = new ActiveChat();
        }
        if(position==2){
            fragment = new LastUsers();
        }
        if(position==3){
            fragment = new Noname();
        }

        return fragment;
    }

    @Override
    public int getCount() {
        return 4;
    }
}

Answer 1

实现一个接口以在两个片段之间进行通信，视图寻呼机所在的类将是中间人

Answer 2

正如其他用户已经说过的那样，实现接口是最佳选择。此链接Communicating with Other Fragments将更详细地解释如何实现您尝试执行的操作。希望这能解决你的问题。

Answer 3

请执行以下操作：

片段A

public class FragmentB extends Fragment{

TextView textViewFragB;

 @Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {

    return inflater.inflate(R.layout.your_layout, container, false);
}

 @Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);

    textViewFragB= findViewById(R.id.textViewFragB);

}

public TextView getTextViewFragB(){

return textViewFragB;
}

<强> FragmentB

public class TabControllerActivity extends AppCompatActivity implements FragmentA.OnButtonPressed{

MyAdapter adapter;

@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.your_activity_layout);

// Your Stuff

}

// Everytime the user clicks on the Button in FragmentA, this interface method gets triggered
@Override
public void onButtonPressed(TextView textViewFragA) {

FragmentB fragmentB = (FragmentB) adapter.getItem(1)/* Be careful here and get the right fragment, 

otherwise the App will crash*/

// Since you got the TextView and not only the text inside of it,
// you can do whatever you want. Here for example we set the text like the textViewFragA. 
//In a few words you turn the textViewFragB to the other one
fragmentB.getTextViewFragB().setText(textViewFragA.getText().toString());

}

}

<强>活动

    var secheltLoc = new google.maps.LatLng(lat, lang);

        myMapOptions = { 
     zoom: 13,
    center: secheltLoc,
    scaleControl: true,
    mapTypeId: google.maps.MapTypeId.ROADMAP,
    icon: 'images/mpicon.png', 
    zoomControlOptions: {position: 
    google.maps.ControlPosition.LEFT_CENTER},mapTypeControlOptions: { 
   mapTypeIds: [google.maps.MapTypeId.ROADMAP, 'map_style']} 
},
        map = new google.maps.Map(document.getElementById("js_bigMap"), myMapOptions);

        marker = new google.maps.Marker({ map: map, draggable: true,position:  new google.maps.LatLng(lat, lang),visible: true,icon: 'images/mpicon.png',});

        marker.setMap(map);

/*markerData contains latlang of locations*/
    for(var i = 0 ; i < markerData.length; i++) 
    {
            marker_ico = 'images/mpicon.png';
            marker = new google.maps.Marker({map: map, draggable: true,position: markerData[i].latLng,visible: true,icon: marker_ico,});

            overlay = new google.maps.OverlayView();
            overlay.draw = function () {};
            overlay.setMap(map);
            google.maps.event.addListener(marker, 'click', function (e)
            {
                var point = overlay.getProjection().fromLatLngToContainerPixel(marker.getPosition()); 
                console.log(point);
            });
            google.maps.event.addListener(marker, 'mouseover', function (e) 
            {
               var point = overlay.getProjection().fromLatLngToContainerPixel(marker.getPosition()); 
               console.log(point);
            });
    }/*loop*/

希望它会有所帮助

如何让两个片段在android中的viewpager中相互通信

3 个答案: