创建对 Activity 的事件回调

创建对 Activity 的事件回调

MainActivity.java

public class MainActivity extends AppCompatActivity {

    private FragmentManager fragmentManager;
    private FragmentTransaction fragmentTransaction;
   
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        final Fraga fraga = new Fraga();
        fragmentManager = getFragmentManager();
        fragmentTransaction = fragmentManager.beginTransaction();
        fragmentTransaction.add(R.id.fragment, fraga, "fragment1");
        fragmentTransaction.commit();
       
        Button bt = (Button) findViewById(R.id.button);
        bt.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                fraga.setcall(new Fraga.CallBack() {
                    @Override
                    public void getText(String xx) {
                        Toast.makeText(MainActivity.this, xx, Toast.LENGTH_SHORT).show();
                    }
                });
            }
        });
    }
}

Fraga.java

public class Fraga extends Fragment {

    EditText editText;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.fraga, null);
        editText = (EditText) v.findViewById(R.id.editText2);
        return v;
    }

    public void setcall(CallBack callBack){
        callBack.getText(editText.getText().toString());
    }

    public interface CallBack{
        public void getText(String xx);
    }
}