Fragment基本使用（三）——与Activity之间传递数据

一、Fragment向Activity传递数据

/**
* Created by chourongqishi on 16/9/21.
*/
public class FirstFragment extends Fragment {

private TransDataToActivityListener listener;

public interface TransDataToActivityListener {
public void setDatas(String datas);
}

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

View view = inflater.inflate(R.layout.fragment_first, container, false);
listener.setDatas("向Activity传递数据");
return view;
}

@Override
public void onAttach(Context context) {
super.onAttach(context);

try {
listener = (TransDataToActivityListener) context;
} catch (ClassCastException e) {
e.printStackTrace();
}
}
}

public class MainActivity extends FragmentActivity implements FirstFragment
.TransDataToActivityListener {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//创建要添加的Fragment对象
FirstFragment firstFragment = new FirstFragment();
//获取Fragment管理器
FragmentManager manager = getSupportFragmentManager();
//获取事物管理器
FragmentTransaction transaction = manager.beginTransaction();
//添加Fragment
transaction.add(R.id.fl_container, firstFragment);
//提交事物
transaction.commit();

}

/**
* 实现Fragment中的接口，获取数据
*
* @param datas
*/
@Override
public void setDatas(String datas) {
Toast.makeText(this, datas, Toast.LENGTH_SHORT).show();
}
}

二、Activity向Fragment传递数据

/**
* 实现Fragment中的接口，获取数据
*
* @param datas
*/
@Override
public void setDatas(String datas) {
//获取Fragment管理器
FragmentManager manager = getSupportFragmentManager();
//获取事物管理器
FragmentTransaction transaction = manager.beginTransaction();
//创建一个新Fragment对象
NewFragment newFragment = new NewFragment();
//添加数据
Bundle bundle = new Bundle();
bundle.putString("datas", datas);
//向Fragment传递数据
newFragment.setArguments(bundle);
//替换Fragment
transaction.replace(R.id.fl_container, newFragment);
//将上一个Fragment加入回退栈
transaction.addToBackStack(null);
//提交事物
transaction.commit();

}

/**
* Created by chourongqishi on 16/9/21.
*/
public class NewFragment extends Fragment {
private TextView tvShowDatas;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable
Bundle savedInstanceState) {

View view = inflater.inflate(R.layout.fragment_new,container,false);
tvShowDatas = (TextView) view.findViewById(R.id.tv_show_datas);
Bundle bundle = getArguments();
String datas = bundle.getString("datas");
tvShowDatas.setText(datas);

return view;
}
}