android样式学习（三） 手势滑动切换图片

使用ViewFlipper和Animation在滑动查看图片效果，比gallery的滚动查看图片好用多了，这个也是实现滚动屏幕切换图片，但是用户体验要好很多！

package cn.gwss.huap;

import android.app.Activity;

import android.content.Intent;

import android.graphics.Color;

import android.graphics.drawable.GradientDrawable;

import android.graphics.drawable.GradientDrawable.Orientation;

import android.os.Bundle;

import android.util.Log;

import android.view.GestureDetector;

import android.view.Gravity;

import android.view.GestureDetector.OnGestureListener;

import android.view.LayoutInflater;

import android.view.MotionEvent;

import android.view.View;

import android.view.animation.AnimationUtils;

import android.widget.ImageView;

import android.widget.LinearLayout;

import android.widget.TextView;

import android.widget.ViewFlipper;

public class MainActivity extends Activity implements OnGestureListener {

private GestureDetector detector;

private ViewFlipper flipper;

Intent getMainActivity = null;

int count = 1;

int[] imgs = { R.drawable.bg1, R.drawable.bg2, R.drawable.bg3 };

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

drawBackground();

LayoutInflater inflater = LayoutInflater.from(this);

final View layout = inflater.inflate(R.layout.view_flipper, null);

setContentView(layout);

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

for (int i = 0; i < imgs.length; i++) {

int imgId = imgs[i];

flipper.addView(getView(imgId), i);

}

detector = new GestureDetector(this);

}

public View getView(int imgId) {

LinearLayout ll = new LinearLayout(MainActivity.this);

ll.setOrientation(LinearLayout.HORIZONTAL);

ll.setPadding(20, 5, 0, 5);

ll.setGravity(Gravity.LEFT);

ImageView iv = new ImageView(MainActivity.this); // 创建ImageView对象

iv.setAdjustViewBounds(true);

iv.setLayoutParams(new LinearLayout.LayoutParams(480, 480));

iv.setImageResource(imgId); // 设置ImageView的

ll.addView(iv); // 将ImageView添加到线性布局中

return ll;

}

public void drawBackground(){

GradientDrawable grad = new GradientDrawable(

Orientation.TL_BR,

new int[] { Color.rgb(0, 0, 127),

Color.rgb(0, 0, 255),

Color.rgb(127, 0, 255),

Color.rgb(127, 127, 255),

Color.rgb(127, 255, 255),

Color.rgb(255, 255, 255)}

);

this.getWindow().setBackgroundDrawable(grad);

}

@Override

public boolean onTouchEvent(MotionEvent event) {

return this.detector.onTouchEvent(event);

}

public boolean onDown(MotionEvent arg0) {

return false;

}

/**

* 滑动有一段距离后离开造作界面，触发的时间

*/

public boolean onFling(MotionEvent e1, MotionEvent e2, float arg2,

float arg3) {

Log.i("Fling", "Fling Happened!");

if (e1.getX() - e2.getX() > 5) {

this.flipper.setInAnimation(AnimationUtils.loadAnimation(this,

R.anim.push_left_in));

this.flipper.setOutAnimation(AnimationUtils.loadAnimation(this,

R.anim.push_left_out));

if (count < 3) {

this.flipper.showNext();

count++;

}

return true;

} else if (e1.getX() - e2.getX() < -5) {

this.flipper.setInAnimation(AnimationUtils.loadAnimation(this,

R.anim.push_right_in));

this.flipper.setOutAnimation(AnimationUtils.loadAnimation(this,

R.anim.push_right_out));

if (count > 1) {

this.flipper.showPrevious();

count--;

}

return true;

}

return true;

}

public void onLongPress(MotionEvent arg0) {

}

public boolean onScroll(MotionEvent arg0, MotionEvent arg1, float arg2,

float arg3) {

return false;

}

public void onShowPress(MotionEvent arg0) {

}

public boolean onSingleTapUp(MotionEvent arg0) {

return false;

}

}

二、view_flipper.xml布局文件

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:id="@+id/layout" android:orientation="horizontal"

android:layout_width="fill_parent" android:layout_height="fill_parent"

>

<ViewFlipper android:id="@+id/view_flipper"

android:layout_width="fill_parent" android:layout_height="fill_parent"

android:persistentDrawingCache="animation" android:flipInterval="1000"

android:inAnimation="@anim/push_left_in" android:outAnimation="@anim/push_left_out"><!--

<LinearLayout android:orientation="horizontal"

android:layout_width="fill_parent" android:layout_height="fill_parent">

<ImageView android:id="@+id/view_bg1" android:src="@drawable/bg1"

android:layout_width="fill_parent" android:layout_height="fill_parent"

>

</ImageView>

</LinearLayout>

<LinearLayout android:orientation="horizontal"

android:layout_width="fill_parent" android:layout_height="fill_parent">

<ImageView android:id="@+id/view_bg2" android:src="@drawable/bg2"

android:layout_width="fill_parent" android:layout_height="fill_parent"

>

</ImageView>

</LinearLayout>

<LinearLayout android:orientation="horizontal"

android:layout_width="fill_parent" android:layout_height="fill_parent">

<ImageView android:id="@+id/view_bg3" android:src="@drawable/bg3"

android:layout_width="fill_parent" android:layout_height="fill_parent"

>

</ImageView>

</LinearLayout>

--></ViewFlipper>

</LinearLayout>

三、anim动画布局文件：

1、push_left_in.xml布局文件：

<?xml version="1.0" encoding="utf-8"?>

<set xmlns:android="http://schemas.android.com/apk/res/android">

<translate android:fromXDelta="100%p" android:toXDelta="0"

android:duration="500" />

<alpha android:fromAlpha="0.1" android:toAlpha="1.0"

android:duration="500" />

</set>

2、push_left_out.xml布局文件

<?xml version="1.0" encoding="utf-8"?>

<set xmlns:android="http://schemas.android.com/apk/res/android">

<translate android:fromXDelta="0" android:toXDelta="-100%p"

android:duration="500" />

<alpha android:fromAlpha="1.0" android:toAlpha="0.1"

android:duration="500" />

</set>

3、push_right_in.xml布局文件

<?xml version="1.0" encoding="UTF-8"?>

<set xmlns:android="http://schemas.android.com/apk/res/android">

<translate android:fromXDelta="-100%p" android:toXDelta="0"

android:duration="500" />

<alpha android:fromAlpha="0.1" android:toAlpha="1.0"

android:duration="500" />

</set>

4、push_right_out.xml布局文件

<?xml version="1.0" encoding="UTF-8"?>

<set xmlns:android="http://schemas.android.com/apk/res/android">

<translate android:fromXDelta="0" android:toXDelta="100%p"

android:duration="500" />

<alpha android:fromAlpha="1.0" android:toAlpha="0.1"

android:duration="500" />

</set>

《完结》