有关ViewFlipper的使用及设置动画效果的讲解
2024-08-22 22:14:46
说到左右滑动,其实实现左右滑动的方式很多,有ViewPaer,自定义实现Viewgroup,gallery等都可以达到这种效果。这里做下ViewFliper实现左右滑动的效果。
会用到以下的技术:
1、ViewFlipper
2、GestureDetector
3、Animation
主要是这三个类在起作用。
ViewFlipper,不妨把它看做一个容器吧,你可以把许多的View放在这个容器中,让它展示给用户,虽然它每次只展示一个view,我感觉它的用途更好是作为广告展示,比如类似购物网站那样的广告滚动展示。比如可以设置自动播放功能,就可以滚动广告了!
原理:向左向右滑动主要是依赖手势来控制,手势向右滑动就调用 viewFlipper.showNext()方法,同理,向左滑动就会去调用viewFlipper.showPrevious()方法。
效果图如下:
接下来直接上代码:
首先在布局文件中添加ViewFlipper的标签:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="@drawable/pattern1" > <Button
android:id="@+id/treasure_chest_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:background="@drawable/treasure" /> <ViewFlipper
android:id="@+id/viewflipper"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="@id/treasure_chest_btn" >
</ViewFlipper> <Button
android:id="@+id/garbage_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@id/viewflipper"
android:background="@drawable/garbage" /> </RelativeLayout>
其次是在anim中定义动画:
slide_left_in.xml:
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" > <!--
画面转换位置移动动画效果
开始向左动画
fromXDelta : 动画开始时 X坐标位置
toXDelta :动画结束时 X坐标位置
duration :动画持续时间
-->
<translate
android:duration="800"
android:fromXDelta="100%p"
android:toXDelta="0" /> </set>
slide_left_out.xml:
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" > <translate
android:duration="800"
android:fromXDelta="0"
android:toXDelta="-100%p" /> </set>
slide_right_in.xml:
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" > <translate
android:duration="800"
android:fromXDelta="-100%p"
android:toXDelta="0" /> </set>
slide_right_out.xml:
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" > <translate
android:duration="800"
android:fromXDelta="0"
android:toXDelta="100%p" /> </set>
最后是Activity中的实现:
package net.loonggg.demo.slider; import android.app.Activity;
import android.os.Bundle;
import android.view.GestureDetector;
import android.view.GestureDetector.OnGestureListener;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.Window;
import android.view.animation.Animation;
import android.view.animation.Animation.AnimationListener;
import android.view.animation.AnimationSet;
import android.view.animation.AnimationUtils;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.ViewFlipper; public class MainActivity extends Activity implements OnGestureListener,
OnTouchListener {
private GestureDetector detector;
private ViewFlipper myViewFlipper;
private int[] imgs = { R.drawable.img0, R.drawable.img1, R.drawable.img2,
R.drawable.img3, R.drawable.img4, R.drawable.img5 };
private int displayedChildIndex = 0; private Button treasure_btn;
private Button garbage_btn; @Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.main);
myViewFlipper = (ViewFlipper) findViewById(R.id.viewflipper);
treasure_btn = (Button) findViewById(R.id.treasure_chest_btn);
garbage_btn = (Button) findViewById(R.id.garbage_btn);
myViewFlipper.setOnTouchListener(this);
myViewFlipper.setLongClickable(true);// 设置长按事件 // myViewFlipper.setAutoStart(true);// 设置是否自动播放,默认不自动播放 detector = new GestureDetector(this);
addFlipperView();
} /**
* 向FlipperView中动态添加View
*/
private void addFlipperView() {
for (int i = 0; i < imgs.length; i++) {
View view = LayoutInflater.from(this).inflate(
R.layout.myviewflipper, null);
TextView title = (TextView) view.findViewById(R.id.view_title);
title.setText("头像");
ImageView iv = (ImageView) view.findViewById(R.id.view_image);
iv.setBackgroundResource(imgs[i]);
myViewFlipper.addView(view);
}
} @Override
public boolean onDown(MotionEvent e) {
return false;
} @Override
public void onShowPress(MotionEvent e) { } @Override
public boolean onSingleTapUp(MotionEvent e) {
return false;
} @Override
public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,
float distanceY) {
return false;
} @Override
public void onLongPress(MotionEvent e) { } @Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
float velocityY) {
// 返回当前正在显示的子视图的索引
displayedChildIndex = myViewFlipper.getDisplayedChild();
final ImageView iv = (ImageView) myViewFlipper.getChildAt(
displayedChildIndex).findViewById(R.id.view_image);
if (e2.getX() - e1.getX() >= 100 && e1.getY() - e2.getY() >= 100) {
AnimationSet outAnim = (AnimationSet) AnimationUtils.loadAnimation(
this, R.anim.collect_treasure);
iv.startAnimation(outAnim);
outAnim.setAnimationListener(new AnimationListener() { public void onAnimationStart(Animation animation) { } public void onAnimationRepeat(Animation animation) { } public void onAnimationEnd(Animation animation) {
showNextView();
AnimationSet downAnim = (AnimationSet) AnimationUtils
.loadAnimation(MainActivity.this, R.anim.up_or_down);
treasure_btn.setAnimation(downAnim);
iv.clearAnimation();
}
}); } else if (e1.getX() - e2.getX() >= 100 && e2.getY() - e1.getY() >= 100) {
AnimationSet outAnim = (AnimationSet) AnimationUtils.loadAnimation(
this, R.anim.throw_garbage);
iv.startAnimation(outAnim);
outAnim.setAnimationListener(new AnimationListener() { public void onAnimationStart(Animation animation) { } public void onAnimationRepeat(Animation animation) { } public void onAnimationEnd(Animation animation) {
showNextView();
AnimationSet leftAnim = (AnimationSet) AnimationUtils
.loadAnimation(MainActivity.this,
R.anim.left_or_right);
garbage_btn.setAnimation(leftAnim);
iv.clearAnimation();
}
}); } else if (e1.getX() - e2.getX() >= 100) {
showNextView();
} else if (e2.getX() - e1.getX() >= 100) {
showPreviousView();
}
return false;
} private void showPreviousView() {
myViewFlipper.setInAnimation(AnimationUtils.loadAnimation(this,
R.anim.slide_right_in));
myViewFlipper.setOutAnimation(AnimationUtils.loadAnimation(this,
R.anim.slide_right_out));
myViewFlipper.showPrevious();
} private void showNextView() {
myViewFlipper.setInAnimation(AnimationUtils.loadAnimation(this,
R.anim.slide_left_in));
myViewFlipper.setOutAnimation(AnimationUtils.loadAnimation(this,
R.anim.slide_left_out));
myViewFlipper.showNext(); } @Override
public boolean onTouch(View v, MotionEvent event) {
return detector.onTouchEvent(event);
} }
转载请注明出处:http://blog.csdn.net/loongggdroid/article/details/18262543
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