使用Fragment 实现动态UI

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity"
    android:orientation="horizontal" >


        <Button
            android:id="@+id/button1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="加载"/>

</LinearLayout>

public class LeftFragment extends Fragment{


    OnClickButton mCallback;
    //定义一个接口
    public interface OnClickButton{
        //并实现一个方法，用来传值并在（onAttach()中绑定activity）
        public void onClickB();
    }
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        //绑定布局文件并获取到里面的控件，特别 注意里面的  view
        View view = inflater.inflate(R.layout.fragment_left,null);
        Button button = (Button) view.findViewById(R.id.button1);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                mCallback.onClickB();
            }
        });
        return view;
    }

    /**
     * 绑定到activity
     * @param activity
     */
    public void onAttach(Activity activity) {
        super.onAttach(activity);
        try {
            mCallback = (OnClickButton) activity;
        } catch (ClassCastException e) {
            throw new ClassCastException(activity.toString()
                    + " must implement OnHeadlineSelectedListener");
        }
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="新闻内容" />

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button" />

</LinearLayout>

public class RightFragment extends Fragment {
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_right, null);
        Button button = (Button) view.findViewById(R.id.button2);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                //getActivity()   获取父类的activity
                Toast.makeText(getActivity(), "我是fragment", Toast.LENGTH_SHORT).show();
            }
        });
        return view;
    }
}

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/fragment_container"
android:layout_width="match_parent"
android:layout_height="match_parent"/>

//实现LeftFragment中定义的接口，主要用来传值或者按钮点击事件
public class MainActivity extends Activity implements LeftFragment.OnClickButton {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        //初始化第一个Fragment
        if (findViewById(R.id.fragment_container) != null){
            if (savedInstanceState != null) {
                return;
            }
        LeftFragment leftFragment = new LeftFragment();
        leftFragment.setArguments(getIntent().getExtras());
        getFragmentManager().beginTransaction().add(R.id.fragment_container,leftFragment).commit();
        }
    }

    /**
     * 实现接口中的方法和点击按钮后加载的fragment
     */
    @Override
    public void onClickB() {
        FragmentManager fragmentManager = getFragmentManager();
        FragmentTransaction transaction = fragmentManager.beginTransaction();
        RightFragment rightFragment = new RightFragment();
        transaction.replace(R.id.fragment_container, rightFragment);
        transaction.addToBackStack(null);
        transaction.commit();
    }
}