如何从一个片段在Android的数据发送到另一个片段？ [英] how to send data from one fragment to another fragment in android?
问题描述
您好 我提出用寻呼机和片段的简单选项卡视图。所以，我有两个选项卡在我看来。在一个选项卡我有列表视图中的每一行有TextView的和喜爱的图像按钮。在第二个选项卡我需要证明它是最喜欢在第一个选项卡的所有项目的名称。所以我需要发送列表从一个片段到另一另一个列表。
Hello I make a simple tab view using pager and fragment . So I have two tabs in my view .In one tab I have list view in which each row have textview and favourite image button .In second Tabs I need to show all item name which is favourite in first tab .so I need to send a list from one fragment to another another list .
这是我的code
Mainactivity.java
public class MainActivity extends FragmentActivity implements ActionBar.TabListener {
ViewPager viewPager;
FragmentpagerAdapter fragmentpagerAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final ActionBar actionBar =getActionBar();
viewPager = (ViewPager) findViewById(R.id.pager);
fragmentpagerAdapter =new FragmentpagerAdapter(getSupportFragmentManager());
viewPager.setAdapter(fragmentpagerAdapter);
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
actionBar.addTab(actionBar.newTab().setText("Stations").setTabListener(this));
actionBar.addTab(actionBar.newTab().setText("fav Station").setTabListener(this));
viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int i, float v, int i1) {
}
@Override
public void onPageSelected(int i) {
actionBar.setSelectedNavigationItem(i);
}
@Override
public void onPageScrollStateChanged(int i) {
}
});
}
@Override
public void onTabSelected(ActionBar.Tab tab, android.app.FragmentTransaction ft) {
viewPager.setCurrentItem(tab.getPosition());
}
@Override
public void onTabUnselected(ActionBar.Tab tab, android.app.FragmentTransaction ft) {
}
@Override
public void onTabReselected(ActionBar.Tab tab, android.app.FragmentTransaction ft) {
}
}
activity_main.xml
<android.support.v4.view.ViewPager xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/pager"
>
</android.support.v4.view.ViewPager>
fragmentone.java
public class Fragmentone extends Fragment{
ArrayList<DataModel> name;
boolean isPressed=false;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_one, container, false);
name=new ArrayList<DataModel>();
name.add(new DataModel("First Station",false));
name.add(new DataModel("Second Station",false));
ListView listView = (ListView) view.findViewById(R.id.list_view);
CustomAdapter customAdapter =new CustomAdapter(getActivity(),name);
listView.setAdapter(customAdapter);
return view;
}
}
customAdapter.java
public class CustomAdapter extends BaseAdapter implements View.OnClickListener {
private Activity activity;
private ArrayList data;
private static LayoutInflater inflater = null;
boolean isPressed=false;
public CustomAdapter(Activity a, ArrayList d) {
/********** Take passed values **********/
activity = a;
data = d;
inflater = (LayoutInflater) activity.
getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public int getCount() {
if (data.size() <= 0)
return 1;
return data.size();
}
@Override
public Object getItem(int position) {
return position;
}
@Override
public void onClick(View v) {
}
/*********
* Create a holder Class to contain inflated xml file elements
*********/
public static class ViewHolder {
public TextView text;
public ImageButton imageButton;
}
@Override
public long getItemId(int position) {
return 0;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
View vi = convertView;
final ViewHolder holder;
if (convertView == null) {
/****** Inflate tabitem.xml file for each row ( Defined below ) *******/
vi = inflater.inflate(R.layout.row_layout, null);
/****** View Holder Object to contain tabitem.xml file elements ******/
holder = new ViewHolder();
holder.text = (TextView) vi.findViewById(R.id.station_name);
holder.imageButton = (ImageButton) vi.findViewById(R.id.favorite);
holder.imageButton.setBackgroundResource(R.drawable.off);
/************ Set holder with LayoutInflater ************/
vi.setTag(holder);
} else
holder = (ViewHolder) vi.getTag();
if (data.size() <= 0) {
holder.text.setText("No Data");
} else {
DataModel dataModel = (DataModel) data.get(position);
/************ Set Model values in Holder elements ***********/
holder.text.setText(dataModel.getText());
// this is for overall row click
vi.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Log.d("row is click","row click"+position);
}
});
// this is for image button onclick
holder.imageButton.setOnClickListener(new View.OnClickListener() {
DataModel dataModel = (DataModel) data.get(position);
@Override
public void onClick(View v) {
if(dataModel.isselected()){
holder.imageButton.setBackgroundResource(R.drawable.off);
dataModel.setIsselected(false);
}else{
holder.imageButton.setBackgroundResource(R.drawable.on);
dataModel.setIsselected(true);
}
isPressed = !isPressed; // reverse
}
});
;
}
return vi;
}
}
datamodel.java
public class DataModel {
String text;
DataModel(String text, boolean isselected) {
this.text = text;
this.isselected = isselected;
}
public String getText() {
return text;
}
public void setText(String text) {
this.text = text;
}
public boolean isselected() {
return isselected;
}
public void setIsselected(boolean isselected) {
this.isselected = isselected;
}
boolean isselected;
}
fragmentone.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:background="#325633"
>
<ListView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/list_view">
</ListView>
</LinearLayout>
rowlayout.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="horizontal"
android:descendantFocusability="blocksDescendants">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/station_name"
android:padding="10dp"
android:textColor="#eee345"
android:textAppearance="?android:textAppearanceLarge"
/>
<ImageButton android:id="@+id/favorite"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:background="#00ffffff"
/>
</LinearLayout>
fragmenttwo.java
public class FragmentTwo extends Fragment {
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_two, container, false);
}
}
fragmenttwo.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="#ee2333">
</LinearLayout>
public class FragmentpagerAdapter extends FragmentPagerAdapter {
public FragmentpagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int i) {
switch (i) {
case 0:
return new Fragmentone();
case 1:
return new FragmentTwo();
default:
break;
}
return null;
}
@Override
public int getCount() {
return 2;
}
}
如在上图中我选择的第一站是我最喜欢的电台。我需要显示在第二个选项卡？可这有可能吗？
As shown in image above I select first station is my favourite station .I need to display on second tab ? can it is possible ?
推荐答案
假设你是从碎裂将数据发送到FragmentB ，那么最好的做法是使用的接口，然后通过容器片段之间进行通信活动。下面是一个小片段，将与我所想说的骨架提供：
Suppose you are sending data from FragmentA to FragmentB, then the best practice is to use Interfaces and then communicate between fragment via the container activity. Below is a small snippet that will provide with the skeleton of what i am trying to say:
步骤1：在碎裂定义一个接口，并覆盖onAttach（）方法来强制要求你的容器的活动来实现接口，并提供身体的方法
Step-1: In your FragmentA define an Interface and override onAttach() method to make it mandatory for your container activity to implement the interface and provide body to its method.
public interface MyInterfaceListener{
public void myMethod(yourParameters)//this method will hold parameters which you can then use in your container activity to send it to FragmentB
}
private MyInterfaceListener listener;
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
if (activity instanceof MyInterfaceListener) {
listener = (MyInterfaceListener) activity;// This makes sure that the container activity has implemented
// the callback interface. If not, it throws an exception
} else {
throw new ClassCastException(activity.toString()
+ " must implemenet MyListFragment.OnItemSelectedListener");
}
}
现在，在你的碎裂可以传递价值的在myMethod（）的，如：如果（！监听= NULL）{
listener.myMethod（yourArguments）;
}
Now, in your FragmentA you can pass value to myMethod() like: if (listener!=null) {
listener.myMethod(yourArguments);
}
步骤2：现在，在您的容器活动实现回调接口
Step-2: Now, In your container activity implement the callback Interface
public class MyActivity extends Activity implements MyInterfaceListener{
@Override
public void myMethod(yourParameters) {
//do your stuff here. do whatever you want to do with the //parameter list which is nothing but data from FragmentA.
FragmentB fragment = (FragmentB) getSupportFragmentManager().findFragmentById(R.id.yourFragmentB);
fragment.methodInFragmentB(sendDataAsArguments);// calling a method in FragmentB and and sending data as arguments.
}
}
步骤3：在FragmentB有一个方法，例如说的 methodInFragmentB（yourParameters）的
Step-3: In FragmentB have a method say for example methodInFragmentB(yourParameters)
public void methodInFragmentB(yourParameters){
//do whatever you want to do with the data.....
}
我希望上面的介绍帮助。谢谢你。
I hope the above description helps. Thanks.
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