Android ActivityGroup和ViewFlipper实现两个Activity滑动（animation.translate）切换

之前在公司做一个Android应用的时候需要实现一个滑动注册登入界面，上网找了很久都没有相关资料，最后看了若干代码和自己研究之后终于实现了。小计一下：

Demo结构图：

其中，ActivityGroupDemoActivity是主显示界面，继承了ActivityGroup，ActivityOne和ActivityTwo分别是要切换的两个Activity。

Anim文件夹里是4个滑动动画（左进、左出、右进、右出），Demo里我实现了手势左右滑动切换界面（以及对应的Activity）

layout里的分别是ActivityGroup和两个Activity的界面。

上代码：

ActivityOne和ActivityTwo里没有功能上的东西，就是打印出了Activity回调onCreate方法时候的Log，以及设置界面。两个界面文件分别是：

act1：

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >    <RelativeLayout        android:id="@+id/relativeLayout1"        android:layout_width="match_parent"        android:layout_height="wrap_content" >                 <LinearLayout        android:id="@+id/linearLayout1"        android:layout_width="match_parent"        android:layout_height="match_parent"        android:layout_margin="100dp"        android:background="#ffffff"        android:gravity="center"        android:orientation="vertical" >             <TextView                 android:id="@+id/textView1"                 android:layout_width="wrap_content"                 android:layout_height="wrap_content"                 android:text="Signin"                 android:textColor="#000000"                 android:textAppearance="?android:attr/textAppearanceLarge" />    </LinearLayout>            </RelativeLayout></LinearLayout>

act2：

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >    <RelativeLayout        android:id="@+id/relativeLayout1"        android:layout_width="match_parent"        android:layout_height="wrap_content" >                 <LinearLayout        android:id="@+id/linearLayout1"        android:layout_width="match_parent"        android:layout_height="match_parent"        android:layout_margin="100dp"        android:background="#ADFF2F"        android:gravity="center"        android:orientation="vertical" >             <TextView                 android:id="@+id/textView1"                 android:layout_width="wrap_content"                 android:layout_height="wrap_content"                 android:text="Register"                 android:textColor="#000000"                 android:textAppearance="?android:attr/textAppearanceLarge" />    </LinearLayout>            </RelativeLayout></LinearLayout>

ActivityGroup里的代码：

package net.john;import android.app.ActivityGroup;import android.content.Intent;import android.os.Bundle;import android.util.Log;import android.view.GestureDetector;import android.view.GestureDetector.OnGestureListener;import android.view.MotionEvent;import android.view.View;import android.view.View.OnTouchListener;import android.view.animation.Animation;import android.view.animation.AnimationUtils;import android.widget.ViewFlipper;public class ActivityGroupDemoActivity extends ActivityGroup implements OnTouchListener, OnGestureListener {private ViewFlipper vf;private GestureDetector gd;//identify four animationprivate Animation leftIn;private Animation leftOut;private Animation rightIn;private Animation rightOut;    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                vf = (ViewFlipper)this.findViewById(R.id.viewFlipper1);        gd = new GestureDetector(this);                vf.addView(getLocalActivityManager().startActivity("", new Intent(ActivityGroupDemoActivity.this, ActivityOne.class)).getDecorView(), 0);        vf.addView(getLocalActivityManager().startActivity("", new Intent(ActivityGroupDemoActivity.this, ActivityTwo.class)).getDecorView(), 1);               vf.setDisplayedChild(0);                vf.setOnTouchListener(this);        vf.setLongClickable(true); //allow long click so that it can recognize gesture                leftIn = AnimationUtils.loadAnimation(this, R.anim.left_in);        leftOut = AnimationUtils.loadAnimation(this, R.anim.left_out);        rightIn = AnimationUtils.loadAnimation(this, R.anim.right_in);        rightOut = AnimationUtils.loadAnimation(this, R.anim.right_out);                Log.d("ActGroupDemo", "ActGroup onCreate()");    }@Overridepublic boolean onTouch(View arg0, MotionEvent arg1) {// TODO Auto-generated method stub//use GestureDetector object to handle motion eventreturn gd.onTouchEvent(arg1);  }@Overridepublic boolean onDown(MotionEvent arg0) {// TODO Auto-generated method stubreturn false;}@Overridepublic boolean onFling(MotionEvent arg0, MotionEvent arg1, float arg2,float arg3) {// TODO Auto-generated method stub//arg0 is the first motion event//arg1 is the last motion event//arg2 is the velocity of x orientation, px/s//arg3 is the velocity of y orientation, px/sint fling_min_distance = 100;int fling_min_velocity = 200;if (arg0.getX() - arg1.getX() > fling_min_distance && Math.abs(arg2) > fling_min_velocity) {vf.setInAnimation(rightIn);vf.setOutAnimation(leftOut);vf.showNext();} else if (arg1.getX() - arg0.getX() > fling_min_distance && Math.abs(arg2) > fling_min_velocity) {vf.setInAnimation(leftIn);vf.setOutAnimation(rightOut);vf.showNext();}return false;}@Overridepublic void onLongPress(MotionEvent e) {// TODO Auto-generated method stub}@Overridepublic boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,float distanceY) {// TODO Auto-generated method stubreturn false;}@Overridepublic void onShowPress(MotionEvent e) {// TODO Auto-generated method stub}@Overridepublic boolean onSingleTapUp(MotionEvent e) {// TODO Auto-generated method stubreturn false;}}

然后是4个Animation（动画）的代码，由于基本类似，就是起始坐标之间的变化，因此只贴一个代码：

左进入：

<set xmlns:android="http://schemas.android.com/apk/res/android"><translateandroid:fromXDelta="-100%p"android:toXDelta="0"android:duration="500"/><alpha   android:fromAlpha="1.0"     android:toAlpha="1.0"android:duration="500" /></set>

translate和alpha分别是滑动和透明度的标签

值得记下的重点是，在给Viewflipper加了Activity的View的时候，addView（view，index）的index参数必须要从0开始。

其次是Log里显示，

当ActivityOne和ActivityTwo是同时加载的，这里在开发中要注意。

资源包在我的资源下载中有。这里就不继续贴代码了。