FragmentCustomAnimation实现Fragment的界面切换
1.知识点:FragmentCustomAnimation
2.演示样例：来自于官网演示样例的简化，这样更方便于学习该知识点。
本演示样例的源代码下载地址为:http://download.csdn.net/detail/far_sight/7932287
3.项目FragmentCustomAnimationTest1效果：反复点buttonnew fragment,第点一次，数字加一,实现原因是第点一次加了一个新的Fragment在栈中。 当点返回键时，数字会降低，原因是Fragment在出栈。当最后一个出栈后再点返回键，程序退出。
两个在layout中的xml文件fragment_stack.xml与hello_world.xml
fragment_stack.xml文件内容为:
<?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:gravity="center_horizontal"
android:orientation="vertical"
android:padding="4dip" >
<LinearLayout
android:id="@+id/simple_fragment"
android:layout_width="match_parent"
android:layout_height="0px"
android:layout_weight="1"
android:background="#ffff0000" >
</LinearLayout>
<Button
android:id="@+id/new_fragment"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0"
android:text="new fragment" >
<requestFocus />
</Button>
</LinearLayout>
hello_world.xml文件的内容为：
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/text"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center_vertical|center_horizontal"
android:text=""
android:textSize="40sp" />
类FragmentCustomAnimations的内容为：
package com.fs.act;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
public class FragmentCustomAnimations extends Activity {
private int mStackLevel = 100;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_stack);
Button button = (Button) findViewById(R.id.new_fragment);
button.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
addFragmentToStack();
}
});
}
void addFragmentToStack() {
Fragment newFragment = CountingFragment.newInstance(++mStackLevel);
FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.replace(R.id.simple_fragment, newFragment);
ft.addToBackStack(null);
ft.commit();
}
public static class CountingFragment extends Fragment {
static CountingFragment newInstance(int num) {
CountingFragment f = new CountingFragment();
Bundle args = new Bundle();
args.putInt("num", num);
f.setArguments(args);
return f;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.hello_world, container, false);
View tv = v.findViewById(R.id.text);
((TextView) tv).setText("Fragment #"+ this.getArguments().getInt("num"));
return v;
}
}
}
<img src="http://img.blog.csdn.net/20140917172541900?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvd2FuZ2d1YW5ncm9uZw==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="" />
4.项目FragmentCustomAnimationTest2加了界面切换时滑动效果。下官是在栈中加Fragment还是按返回键让Fragment从栈中出栈，都有滑动效果。其他与项目
FragmentCustomAnimationTest1同样。
(1) 在上一项目基础上在res以下添加�目录animator，里面加下四个文件
fragment_slide_left_enter.xml
fragment_slide_left_exit.xml
fragment_slide_right_enter.xml
fragment_slide_right_exit.xml
(2)FragmentCustomAnimations.java的内容改为
package com.fs.act;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
public class FragmentCustomAnimations extends Activity {
private int mStackLevel = 100;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_stack);
Button button = (Button) findViewById(R.id.new_fragment);
button.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
addFragmentToStack();
}
});
}
@SuppressLint("NewApi")
void addFragmentToStack() {
Fragment newFragment = CountingFragment.newInstance(++mStackLevel);
FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.setCustomAnimations(R.animator.fragment_slide_left_enter,
R.animator.fragment_slide_left_exit,
R.animator.fragment_slide_right_enter,
R.animator.fragment_slide_right_exit);
ft.replace(R.id.simple_fragment, newFragment);
ft.addToBackStack(null);
ft.commit();
}
public static class CountingFragment extends Fragment {
static CountingFragment newInstance(int num) {
CountingFragment f = new CountingFragment();
Bundle args = new Bundle();
args.putInt("num", num);
f.setArguments(args);
return f;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.hello_world, container, false);
View tv = v.findViewById(R.id.text);
((TextView) tv).setText("Fragment #"
+ this.getArguments().getInt("num"));
return v;
}
}
}
完