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Android ViewFlipper触摸动画 实现androd主页面的左右拖动效果
来源:互联网   发布日期:2015-10-02 16:50:27   浏览:2764次  

导读:今天给大家介绍一下如何实现androd主页面的左右拖动效果。实现起来很简单,就是使用ViewFlipper来将您要来回拖动的View装在一 起,然后与GestureDetector手势识别类来联动,确定要显示哪个View,加上一点点动画......

今天给大家介绍一下如何实现androd主页面的左右拖动效果。实现起来很简单,就是使用ViewFlipper来将您要来回拖动的View装在一 起,然后与GestureDetector手势识别类来联动,确定要显示哪个View,加上一点点动画效果即可。比如当手指向左快速滑动时跳转到上一个 View,手指向右快速滑动时跳转到下一个View,本例中使用图片作为各个View的页面,实现左右快速滑动显示不同的图片。

首先来看看我们的layout,如下所示:

<linearlayout android:layout_height="fill_parent" android:layout_width="fill_parent" android:orientation="vertical" xmlns:android="http://schemas.android.com/apk/res/android">

<viewflipper android:id="@+id/flipper" android:layout_below="@+id/CockpitLayout" android:layout_height="fill_parent" android:layout_width="fill_parent">

<include android:id="@+id/firstlayout" layout="@layout/first">

<include android:id="@+id/secondlayout" layout="@layout/second">

<include android:id="@+id/thirdlayout" layout="@layout/third">

<include android:id="@+id/fourthlayout" layout="@layout/fourth">

</include></include></include></include></viewflipper>

</linearlayout>

如上所示,在ViewFlipper中放置多个layout(接下来会在不同的layout中来回滑动),ViewFlipper在同一个页面就显示其中一个layout。ViewFlipper中的四个layout很简单,我们就放置一张图片,如下所示:

<linearlayout android:gravity="center_vertical" android:layout_height="fill_parent" android:layout_width="fill_parent" xmlns:android="http://schemas.android.com/apk/res/android">

<imageview android:layout_height="wrap_content" android:layout_width="wrap_content" android:src="@drawable/v1">

</imageview></linearlayout>

接下来我们来看看Activity,我们的Activity需要实现两个接口OnGestureListener,OnTouchListener。具体的代码如下所示,代码中都有相应的注释,这里就不再详述。

package com.ideasandroid.demo;

import android.app.Activity;

import android.os.Bundle;

import android.view.GestureDetector;

import android.view.MotionEvent;

import android.view.View;

import android.view.GestureDetector.OnGestureListener;

import android.view.View.OnTouchListener;

import android.view.animation.AccelerateInterpolator;

import android.view.animation.Animation;

import android.view.animation.TranslateAnimation;

import android.widget.ViewFlipper;

public class ViewFlipperDemo extends Activity implements OnGestureListener,OnTouchListener{

private ViewFlipper mFlipper;

GestureDetector mGestureDetector;

private int mCurrentLayoutState;

private static final int FLING_MIN_DISTANCE = 100;

private static final int FLING_MIN_VELOCITY = 200;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

mFlipper = (ViewFlipper) findViewById(R.id.flipper);

//注册一个用于手势识别的类

mGestureDetector = new GestureDetector(this);

//给mFlipper设置一个listener

mFlipper.setOnTouchListener(this);

mCurrentLayoutState = 0;

//允许长按住ViewFlipper,这样才能识别拖动等手势

mFlipper.setLongClickable(true);

}

/**

* 此方法在本例中未用到,可以指定跳转到某个页面

* @param switchTo

*/

public void switchLayoutStateTo(int switchTo) {

while (mCurrentLayoutState != switchTo) {

if (mCurrentLayoutState > switchTo) {

mCurrentLayoutState--;

mFlipper.setInAnimation(inFromLeftAnimation());

mFlipper.setOutAnimation(outToRightAnimation());

mFlipper.showPrevious();

} else {

mCurrentLayoutState++;

mFlipper.setInAnimation(inFromRightAnimation());

mFlipper.setOutAnimation(outToLeftAnimation());

mFlipper.showNext();

}

}

;

}

/**

* 定义从右侧进入的动画效果

* @return

*/

protected Animation inFromRightAnimation() {

Animation inFromRight = new TranslateAnimation(

Animation.RELATIVE_TO_PARENT, +1.0f,

Animation.RELATIVE_TO_PARENT, 0.0f,

Animation.RELATIVE_TO_PARENT, 0.0f,

Animation.RELATIVE_TO_PARENT, 0.0f);

inFromRight.setDuration(500);

inFromRight.setInterpolator(new AccelerateInterpolator());

return inFromRight;

}

/**

* 定义从左侧退出的动画效果

* @return

*/

protected Animation outToLeftAnimation() {

Animation outtoLeft = new TranslateAnimation(

Animation.RELATIVE_TO_PARENT, 0.0f,

Animation.RELATIVE_TO_PARENT, -1.0f,

Animation.RELATIVE_TO_PARENT, 0.0f,

Animation.RELATIVE_TO_PARENT, 0.0f);

outtoLeft.setDuration(500);

outtoLeft.setInterpolator(new AccelerateInterpolator());

return outtoLeft;

}

/**

* 定义从左侧进入的动画效果

* @return

*/

protected Animation inFromLeftAnimation() {

Animation inFromLeft = new TranslateAnimation(

Animation.RELATIVE_TO_PARENT, -1.0f,

Animation.RELATIVE_TO_PARENT, 0.0f,

Animation.RELATIVE_TO_PARENT, 0.0f,

Animation.RELATIVE_TO_PARENT, 0.0f);

inFromLeft.setDuration(500);

inFromLeft.setInterpolator(new AccelerateInterpolator());

return inFromLeft;

}

/**

* 定义从右侧退出时的动画效果

* @return

*/

protected Animation outToRightAnimation() {

Animation outtoRight = new TranslateAnimation(

Animation.RELATIVE_TO_PARENT, 0.0f,

Animation.RELATIVE_TO_PARENT, +1.0f,

Animation.RELATIVE_TO_PARENT, 0.0f,

Animation.RELATIVE_TO_PARENT, 0.0f);

outtoRight.setDuration(500);

outtoRight.setInterpolator(new AccelerateInterpolator());

return outtoRight;

}

public boolean onDown(MotionEvent e) {

// TODO Auto-generated method stub

return false;

}

/*

* 用户按下触摸屏、快速移动后松开即触发这个事件

* e1:第1个ACTION_DOWN MotionEvent

* e2:最后一个ACTION_MOVE MotionEvent

* velocityX:X轴上的移动速度,像素/秒

* velocityY:Y轴上的移动速度,像素/秒

* 触发条件 :

* X轴的坐标位移大于FLING_MIN_DISTANCE,且移动速度大于FLING_MIN_VELOCITY个像素/秒

*/

public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,

float velocityY) {

if (e1.getX() - e2.getX() > FLING_MIN_DISTANCE

&& Math.abs(velocityX) > FLING_MIN_VELOCITY) {

// 当像左侧滑动的时候

//设置View进入屏幕时候使用的动画

mFlipper.setInAnimation(inFromRightAnimation());

//设置View退出屏幕时候使用的动画

mFlipper.setOutAnimation(outToLeftAnimation());

mFlipper.showNext();

} else if (e2.getX() - e1.getX() > FLING_MIN_DISTANCE

&& Math.abs(velocityX) > FLING_MIN_VELOCITY) {

// 当像右侧滑动的时候

mFlipper.setInAnimation(inFromLeftAnimation());

mFlipper.setOutAnimation(outToRightAnimation());

mFlipper.showPrevious();

}

return false;

}

public void onLongPress(MotionEvent e) {

// TODO Auto-generated method stub

}

public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,

float distanceY) {

return false;

}

public void onShowPress(MotionEvent e) {

// TODO Auto-generated method stub

}

public boolean onSingleTapUp(MotionEvent e) {

// TODO Auto-generated method stub

return false;

}

public boolean onTouch(View v, MotionEvent event) {

// 一定要将触屏事件交给手势识别类去处理(自己处理会很麻烦的)

return mGestureDetector.onTouchEvent(event);

}

}

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