学步园

1. 引言：

    Honeycomb3.0中，在Fragment添加或移除时为其添加画动效果。

2. 功能实现：

    (1) 主布局(main.xml)实现： <?xml version="1.0" encoding="utf-8"?><br /> <LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android"<br /> android:orientation = "vertical"<br /> android:layout_width = "fill_parent"<br /> android:layout_height = "fill_parent"<br /> ></p> <p> <LinearLayout<br /> android:orientation = "horizontal"<br /> android:padding = "4dip"<br /> android:gravity = "center_vertical"<br /> android:layout_weight = "1"<br /> android:layout_width = "match_parent"<br /> android:layout_height = "wrap_content"<br /> ><br /> <Button<br /> android:id = "@+id/firstButton"<br /> android:layout_width = "wrap_content"<br /> android:layout_height = "wrap_content"<br /> android:text = "Hide"<br /> /><br /> <fragment<br /> android:name = "com.flora.FragmentAnimationActivity$FirstFragment"<br /> android:id = "@+id/firstFragment"<br /> android:layout_weight = "1"<br /> android:layout_width = "0px"<br /> android:layout_height = "wrap_content"<br /> /><br /> </LinearLayout></p> <p> <LinearLayout<br /> android:orientation = "horizontal"<br /> android:padding = "4dip"<br /> android:gravity = "center_vertical"<br /> android:layout_weight = "1"<br /> android:layout_width = "match_parent"<br /> android:layout_height = "wrap_content"<br /> ><br /> <Button<br /> android:id = "@+id/secondButton"<br /> android:layout_width = "wrap_content"<br /> android:layout_height = "wrap_content"<br /> android:text = "Hide"<br /> /><br /> <fragment<br /> android:name = "com.flora.FragmentAnimationActivity$SecondFragment"<br /> android:id = "@+id/secondFragment"<br /> android:layout_weight = "1"<br /> android:layout_width = "0px"<br /> android:layout_height = "wrap_content"<br /> /><br /> </LinearLayout></p> <p></LinearLayout>

    (2) FirstFragment布局(first_fragment.xml)实现：<?xml version="1.0" encoding="utf-8"?><br /> <LinearLayout<br /> xmlns:android = "http://schemas.android.com/apk/res/android"<br /> android:orientation = "vertical"<br /> android:padding = "4dip"<br /> android:layout_width = "match_parent"<br /> android:layout_height = "wrap_content"<br /> ><br /> <TextView<br /> android:id = "@+id/msg"<br /> android:layout_width = "match_parent"<br /> android:layout_height = "wrap_content"<br /> android:layout_weight = "0"<br /> android:paddingBottom = "4dip"<br /> /><br /> </LinearLayout>

    (3) SecondFragment布局(second_fragment.xml)实现：<?xml version="1.0" encoding="utf-8"?><br /> <LinearLayout<br /> xmlns:android = "http://schemas.android.com/apk/res/android"<br /> android:layout_width = "match_parent"<br /> android:layout_height = "match_parent"<br /> ></p> <p> <TextView<br /> android:id = "@+id/msg"<br /> android:layout_width = "match_parent"<br /> android:layout_height = "wrap_content"<br /> android:layout_weight = "0"<br /> android:paddingBottom = "4dip"<br /> /></p> <p></LinearLayout>

    (4) 主Activity实现：package com.flora;<br /> import android.app.Activity;<br /> import android.app.Fragment;<br /> import android.app.FragmentManager;<br /> import android.app.FragmentTransaction;<br /> import android.graphics.Color;<br /> import android.os.Bundle;<br /> import android.view.LayoutInflater;<br /> import android.view.View;<br /> import android.view.ViewGroup;<br /> import android.view.View.OnClickListener;<br /> import android.widget.Button;<br /> import android.widget.TextView;<br /> public class FragmentAnimationActivity extends Activity {<br /> @Override<br /> public void onCreate(Bundle savedInstanceState) {<br /> super.onCreate(savedInstanceState);</p> <p> setContentView(R.layout.main);</p> <p> FragmentManager fm = getFragmentManager();<br /> addListener(R.id.firstButton, fm.findFragmentById(R.id.firstFragment));<br /> addListener(R.id.secondButton, fm.findFragmentById(R.id.secondFragment));<br /> }</p> <p> private void addListener(int buttonID, final Fragment fragment) {<br /> final Button button = (Button)findViewById(buttonID);<br /> button.setOnClickListener(new OnClickListener() {<br /> public void onClick(View v) {<br /> FragmentTransaction ft = getFragmentManager().beginTransaction();<br /> ft.setCustomAnimations(android.R.animator.fade_in,<br /> android.R.animator.fade_out);<br /> if (fragment.isHidden()) {<br /> ft.show(fragment);<br /> button.setText("隐藏");<br /> } else {<br /> ft.hide(fragment);<br /> button.setText("显示");<br /> }<br /> ft.commit();<br /> }<br /> });<br /> }</p> <p> public static class FirstFragment extends Fragment {<br /> @Override<br /> public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {<br /> View v = inflater.inflate(R.layout.first_fragment, container, false);<br /> TextView tv = (TextView)v.findViewById(R.id.msg);<br /> tv.setText("This is first fragment.");<br /> tv.setBackgroundColor(Color.GREEN);<br /> return v;<br /> }<br /> }</p> <p> public static class SecondFragment extends Fragment {<br /> @Override<br /> public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {<br /> View v = inflater.inflate(R.layout.second_fragment, container, false);<br /> TextView tv = (TextView)v.findViewById(R.id.msg);<br /> tv.setText("This is second fragment.");<br /> tv.setBackgroundColor(Color.RED);<br /> return v;<br /> }<br /> }<br /> }