Android - MyFragment.java

package com.example.droid.util;

import com.example.droid.R;
import android.app.Activity;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;

public class MyFragment extends Fragment {
private View view;
private EditText editText;
private Button btn_one;
private Button btn_two;
private MyFragmentInterface activity;
private int id;
private OnClickListener clickListener = new OnClickListener() {
@Override
public void onClick(View view) {
String text = editText.getText().toString();
switch (view.getId()) {
case R.id.btn_one:
if (activity != null) {
activity.setText(text);
}
break;
case R.id.btn_two:
if (activity != null) {
activity.sendMessage(id, text);
}
break;
default:
break;
}
}
};

public void setCallback (MyFragmentInterface activity) {
this.activity = activity;
}
public void setId (int id) {
this.id = id;
}
public void setText (String text) {
if (editText != null) {
editText.setText(text);
}
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
super.onCreateView(inflater, container, savedInstanceState);
// 通过inflater来创建视图, 并返回该视图(View)
view = inflater.inflate(R.layout.fragment_one, null);

editText = (EditText) view.findViewById(R.id.editText);
btn_one = (Button) view.findViewById(R.id.btn_one);
btn_two = (Button) view.findViewById(R.id.btn_two);

btn_one.setOnClickListener(clickListener);
btn_two.setOnClickListener(clickListener);
return view;
}

// Interface
public static interface MyFragmentInterface {
void setText (String text);
void sendMessage (int id, String text);
}
}

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<EditText android:id="@+id/editText"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<Button android:id="@+id/btn_one"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/editText"
android:text="ButtonOne"/>
<Button android:id="@+id/btn_two"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/editText"
android:layout_toRightOf="@id/btn_one"
android:text="ButtonTwo"/>
</RelativeLayout>