[Android Pro] ListView,GridView之LayoutAnimation特殊动画的实现

转载自：/article/3746993.html

LayoutAnimation干嘛用的？不知道的话网上搜一下。
Android的Animation之LayoutAnimation使用方法

有两种用法，我的通常写在代码中，像下面这样：

/**
* Layout动画
*
* @return
*/
protected LayoutAnimationController getAnimationController() {
int duration=300;
AnimationSet set = new AnimationSet(true);

Animation animation = new AlphaAnimation(0.0f, 1.0f);
animation.setDuration(duration);
set.addAnimation(animation);

animation = new TranslateAnimation(Animation.RELATIVE_TO_SELF, 0.0f,
Animation.RELATIVE_TO_SELF, 0.0f, Animation.RELATIVE_TO_SELF,
-1.0f, Animation.RELATIVE_TO_SELF, 0.0f);
animation.setDuration(duration);
set.addAnimation(animation);

LayoutAnimationController controller = new LayoutAnimationController(set, 0.5f);
controller.setOrder(LayoutAnimationController.ORDER_NORMAL);
return controller;
}

应用的时候只需这样：

listView = (ListView) findViewById(R.id.listView);
listView.setLayoutAnimation(getAnimationController());
adapter = new ListViewAdapter(stores);
listView.setAdapter(adapter);

这样一个简单的LayoutAnimation就完成了。

别看到这里就以为文章就完了，以上都是些小玩意。呵呵，还有更厉害的！

你想设置更炫的动画吗？LayoutAnimation通常是Item一个一个的出现，有某种规律的。想让每个Item都有自己的动画吗？那就继续看下去。

.......
private int duration=1000;
private Animation push_left_in,push_right_in;
private Animation slide_top_to_bottom,slide_bottom_to_top;
public ListViewAdapter(ArrayList<Store> list) {
this.list = list;
push_left_in=AnimationUtils.loadAnimation(context, R.anim.push_left_in);
push_right_in=AnimationUtils.loadAnimation(context, R.anim.push_right_in);
slide_top_to_bottom=AnimationUtils.loadAnimation(context, R.anim.slide_top_to_bottom);
slide_bottom_to_top=AnimationUtils.loadAnimation(context, R.anim.slide_bottom_to_top);
}
........

@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
ViewHodler hodler;
if (convertView == null) {
hodler = new ViewHodler();
convertView = LayoutInflater.from(context).inflate(
R.layout.simple_item_7_for_main, null);
........

convertView.setTag(hodler);

if (position % 2 == 0) {
push_left_in.setDuration(duration);
convertView.setAnimation(push_left_in);
} else {
push_right_in.setDuration(duration);
convertView.setAnimation(push_right_in);
}

/*if(position==0){
slide_bottom_to_top.setDuration(duration);
convertView.setAnimation(slide_bottom_to_top);
}
else{
slide_top_to_bottom.setDuration(duration);
convertView.setAnimation(slide_top_to_bottom);
}*/

}else{
hodler = (ViewHodler) convertView.getTag();
}
........

return convertView;
}

看见上面的动画设置了吗？将动画写在getView()中，这样可以设置很多不同的动画。其实这不属于LayoutAnimation的范畴了。
你可以试一下，如果设计好的话，可以有比LayoutAnimation更酷的效果。

我这里只试了两种效果。

下面是我的动画文件，共四个：

第一种效果：item分别从左右两侧滑入效果。

push_left_in.xml

<?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="300"/>
<alpha android:fromAlpha="0.0" android:toAlpha="1.0" android:duration="300" />
</set>

push_right_in.xml

<?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="300"/>
<alpha android:fromAlpha="0.0" android:toAlpha="1.0" android:duration="300" />
</set>

第2种效果：第一个item从下往上滑入，其他Item从上往下滑入效果，这个效果如果单个Item比较高（height）的话效果非常酷（卡牛的老版本好像用的就是这种效果）。
slide_bottom_to_top.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" android:interpolator="@android:anim/accelerate_interpolator">
<translate android:fromYDelta="100%" android:toXDelta="0" android:duration="300" />
<alpha android:fromAlpha="0.0" android:toAlpha="1.0" android:duration="300" />
</set>

slide_top_to_bottom.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" android:interpolator="@android:anim/accelerate_interpolator">
<translate android:fromYDelta="-100%" android:toXDelta="0" android:duration="300" />
<alpha android:fromAlpha="0.0" android:toAlpha="1.0" android:duration="300" />
</set>

另外一篇：
这个不是我写的。

GridView的item从上下左右飞入

import java.util.Random;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.view.animation.Animation;
import android.view.animation.TranslateAnimation;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.GridView;
import android.widget.ImageView;
public class ZdemoActivity extends Activity {

private GridView gv;
private Button btn;
private TranslateAnimation taLeft, taRight, taTop, taBlow;
private int[] imgList = new int[15];
private MyAdapter mAdapter;
private LayoutInflater mInflater;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
this.InitView();
this.InitAnima();
this.InitData();
}
private void InitAnima() {
// TODO Auto-generated method stub
taLeft = 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);
taRight = 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);
taTop = new TranslateAnimation(Animation.RELATIVE_TO_PARENT, 0.0f,
Animation.RELATIVE_TO_PARENT, 0.0f,
Animation.RELATIVE_TO_PARENT, 1.0f,
Animation.RELATIVE_TO_PARENT, 0.0f);
taBlow = new TranslateAnimation(Animation.RELATIVE_TO_PARENT, 0.0f,
Animation.RELATIVE_TO_PARENT, 0.0f,
Animation.RELATIVE_TO_PARENT, -1.0f,
Animation.RELATIVE_TO_PARENT, 0.0f);
taLeft.setDuration(1000);
taRight.setDuration(1000);
taTop.setDuration(1000);
taBlow.setDuration(1000);
}
private void InitData() {
// TODO Auto-generated method stub
for (int i = 0; i < 15; i++) {
imgList[i] = R.drawable.ic_launcher;
}
mAdapter = new MyAdapter();
gv.setAdapter(mAdapter);
}
private void InitView() {
// TODO Auto-generated method stub
gv = (GridView) findViewById(R.id.gridView1);
btn = (Button) findViewById(R.id.button1);
btn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
mAdapter = null;
mAdapter = new MyAdapter();
gv.setAdapter(mAdapter);
mAdapter.notifyDataSetChanged();
}
});
mInflater = (LayoutInflater) this
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
private class MyAdapter extends BaseAdapter {
@Override
public int getCount() {
// TODO Auto-generated method stub
return imgList.length;
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return imgList[position];
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
ViewHolder holder = null;
if (convertView == null) {
convertView = mInflater.inflate(R.layout.item, null);
holder = new ViewHolder();
holder.image = (ImageView) convertView
.findViewById(R.id.imageView1);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
int imgID = imgList[position];
holder.image.setImageResource(imgID);
Random ran = new Random();
int rand = ran.nextInt(4);
switch (rand) {
case 0:
convertView.startAnimation(taLeft);
break;
case 1:
convertView.startAnimation(taRight);
break;
case 2:
convertView.startAnimation(taTop);
break;
case 3:
convertView.startAnimation(taBlow);
break;
}
return convertView;
}
class ViewHolder {
public ImageView image;
}
}
}