Fragment与Fragment之间的数据通信
Fragment与Fragment之间的数据通（FragmentA中向FragmentB发送数据）利用接口回调的方法
在FragmentA中的步骤
1.在FragmentA中定义一个内部接口
publicinterface OnPassValueSelectedListener{
public void putData(Stringvalue);
}
2.在Fragment中定义接口对象
privateOnPassValueSelectedListener mListener;
3.在onAttach方法中将activity强制转换成接口对象
mListener=(OnPassValueSelectedListener) activity;
4.将数据设置到接口方法的参数中
mListener.putData(data);
在Activity中操作步骤：
1.实现FragmentA中的接口，并实现该接口中的方法
2.在该方法中封装数据并通过Bundle将数据发送FragmentB中
Bundlebundle=new Bundle();
bundle.putString("detail",value);
FragmentBfragmentB=new FragmentB();
fragmentB.setArguments(bundle);
FragmentManagermanager=getFragmentManager();
FragmentTransactionfragmentTransaction=manager.beginTransaction();
fragmentTransaction.replace(R.id.ll,fragmentB);
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commit();
在FragmentB中的操作
1.接收数据
Bundlebundle =getArguments();
data=bundle.getString("detail");
=================================================================
代码详情：
public classFragmentA extends Fragment {
private static final StringTAG="FragmentA";
privateOnPassValueSelectedListener mListener;
private ListView lv;
private int width=0;
//定义一个接口，并定义一个回调方法
public interfaceOnPassValueSelectedListener{
public voidputData(String value);
}
@Override
public void onAttach(Activity activity){
// TODO Auto-generated methodstub
super.onAttach(activity);
Log.i(TAG,"-------onAttach-------->>");
try {//多态
mListener =(OnPassValueSelectedListener) activity;
} catch (Exception e) {
throw newClassCastException(activity.toString() + " must implementOnPassValueSelectedListener");
}
}
@SuppressLint("NewApi")
@Override
public void onCreate(BundlesavedInstanceState) {
// TODO Auto-generated methodstub
//获得屏幕宽高
Pointpoint=new Point();
getActivity().getWindowManager().getDefaultDisplay().getSize(point);
width=point.x;
int height=point.y;
getActivity().setTitle(width+ ":" + height);
super.onCreate(savedInstanceState);
Log.i(TAG,"-------onCreate-------->>");
}
@Override
public View onCreateView(LayoutInflaterinflater, ViewGroup container,
BundlesavedInstanceState) {
Log.i(TAG,"-------onCreateView-------->>");
View view=inflater.inflate(R.layout.fragment_a, container, false);
lv=(ListView)view.findViewById(R.id.listView1);
String[]strings=getResources().getStringArray(R.array.move);
ArrayAdapter
lv.setAdapter(adapter);
lv.setOnItemClickListener(newOnItemClickListener() {
@Override
public voidonItemClick(AdapterView parent, View view,
intposition, long id) {
// TODOAuto-generated method stub
InputStreamis;
ByteArrayOutputStreambos=new ByteArrayOutputStream();
Stringdata="";
try {
is=getActivity().getResources().getAssets().open("movie"+position+".txt");
byte[]buffer=newbyte[1024];
intlen=-1;
while((len=is.read(buffer))!=-1) {
bos.write(buffer,0, len);
bos.flush();
}
data=newString(bos.toByteArray(), "utf-8");
} catch(IOException e) {
//TODO Auto-generated catch block
e.printStackTrace();
}
if(width>=200) {
mListener.putData(data);
}else {
Intentintent=new Intent(getActivity(), ContentActivity.class);
Bundlebundle=new Bundle();
intent.putExtra("content",data);
startActivity(intent);
}
}
});
return view;
}
}
1. 在mainActivity中实现在FragmentA中定义的接口，并且封装数据：
packagecom.jason.android12_betweenfragment;
importcom.jason.android12_betweenfragment.FragmentA.OnPassValueSelectedListener;
importandroid.os.Bundle;
importandroid.app.Activity;
importandroid.app.FragmentManager;
importandroid.app.FragmentTransaction;
importandroid.view.Menu;
importandroid.view.View;
importandroid.view.View.OnClickListener;
importandroid.widget.Button;
public classMainActivity extends Activity implements OnPassValueSelectedListener{
@Override
protected void onCreate(BundlesavedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@Override
public void putData(String value) {
//封装数据
Bundle bundle=newBundle();
bundle.putString("detail",value);
FragmentBfragmentB=new FragmentB();
//传递数据
fragmentB.setArguments(bundle);
FragmentManagermanager=getFragmentManager();
FragmentTransactionfragmentTransaction=manager.beginTransaction();
fragmentTransaction.replace(R.id.ll,fragmentB);
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commit();
}
}
2. 在FragmentB中接受数据：
packagecom.jason.android12_betweenfragment;
importandroid.app.Activity;
importandroid.app.Fragment;
importandroid.os.Bundle;
import android.util.Log;
importandroid.view.LayoutInflater;
importandroid.view.View;
importandroid.view.View.OnClickListener;
importandroid.view.ViewGroup;
importandroid.widget.Button;
importandroid.widget.TextView;
public classFragmentB extends Fragment {
private static final StringTAG="FragmentB";
private String data="";
public FragmentB() {
// TODO Auto-generatedconstructor stub
}
@Override
public void onAttach(Activity activity){
// TODO Auto-generated methodstub
super.onAttach(activity);
Log.i(TAG,"-------onAttach-------->>");
}
@Override
public void onCreate(BundlesavedInstanceState) {
// TODO Auto-generated methodstub
super.onCreate(savedInstanceState);
Log.i(TAG,"-------onCreate-------->>");
Bundlebundle =getArguments();
data=bundle.getString("detail");
}
}