学习之路之Fragment和Fragment之间的传值

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第一:先把FragmentA中的数据传到绑定的Activity中, 然后再把Activity的值传到FragmentB中,实现两个Fragment之间的传值;

Activity和Fragment之间的传值和可以利用接口回调的机制进行传值,具体的代码如下

先让Activity实现回调的接口并重写方法

public class MainActivity extends AppCompatActivity  implements FragmentA.CallBackFragmentA{    private TextView tv;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        tv = (TextView) findViewById(R.id.tv);        FragmentManager manager = getFragmentManager();        FragmentTransaction beginTransaction = manager.beginTransaction();        beginTransaction.add(R.id.rl, new FragmentA());        beginTransaction.commit();    }    @Override    public void dataHand(String s) {        if (!TextUtils.isEmpty(s)) {            tv.setText(s);        }    }}

在Fragment的类中有一个回调接口的对象(即Activity) 并实例化,然后调用接口中的方法,这时,其实是在执行Activity中重写的接口方法;

public class FragmentA extends Fragment {    private EditText et;    private Button bt;    CallBackFragmentA callBackFragmentA;    @Override    public void onAttach(Activity activity) {        super.onAttach(activity);        callBackFragmentA = (CallBackFragmentA) activity;    }    @Nullable    @Override    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {      View view=  inflater.inflate(R.layout.item, container, false);        bt = (Button) view.findViewById(R.id.bt);        et = (EditText) view.findViewById(R.id.et1);        bt.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                String s= et.getText().toString();                callBackFragmentA.dataHand(s);            }        });        return view;    }    public interface CallBackFragmentA {        public  void    dataHand(String s);    }//    public  void  onclick(View view) {//       String s= et.getText().toString();//        callBackFragmentA.dataHand(s);//    }}

这里要注意buttton控件不要用OnClick方法因为Fragment是Activity中的一个控件,所以

OnClick应该在Activity中被使用,但是你的控件是在Fragment的xml文件中生成的...

第二种:直接在FragmentA的类中得到在FragmentB类中的控件,然后直接设置文本即可

具体的代码如下:

public class FragmentA extends Fragment {    private EditText et;    private Button bt;    String s;    @Nullable    @Override    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {        View view = inflater.inflate(R.layout.fragmenta, container, false);        bt = (Button) view.findViewById(R.id.bt);        et = (EditText) view.findViewById(R.id.et);        bt.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                s= et.getText().toString();

<span style="white-space:pre"></span>//得到在FragmentB类中的TextView的控件对象               TextView tv = (TextView) getActivity().findViewById(R.id.tv);

<span style="white-space:pre"></span>//直接设置文本                tv.setText(s);                     }        });        return view;    }}

第三种:在FragmentA类中得到FragmentB类的对象然后调用在FragmentB类中的方法

具体的代码如下:

public class FragmentA extends Fragment {    private EditText et;    private Button bt;    String s;    @Nullable    @Override    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {        View view = inflater.inflate(R.layout.fragmenta, container, false);        bt = (Button) view.findViewById(R.id.bt);        et = (EditText) view.findViewById(R.id.et);        bt.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                s= et.getText().toString();              FragmentB fragmentB= (FragmentB) getFragmentManager().findFragmentById(R.id.fragment2);                fragmentB.settextVable(s);            }        });        return view;    }}

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