发现用这个控件滑动图片好卡啊
有什么解决办法吗，真机调试也是卡
元素滴3579866
2016-08-18
5 回答
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder viewHolder;
if(convertView==null){
viewHolder=new ViewHolder();
convertView=myInflater.inflate(R.layout.activity_main, null);
viewHolder.image.setBackgroundResource(src[position%src.length]);
viewHolder.image.setLayoutParams(new Gallery.LayoutParams(200, 200));//缩略图的宽和高
viewHolder.image.setScaleType(ScaleType.FIT_XY);//缩放模式，横向缩放
convertView.setTag(viewHolder);
}else {
viewHolder=(ViewHolder) convertView.getTag();
}
return convertView;
}
class ViewHolder{
public ImageView image;
}
查看5条回复
public class ImageAdapter extends BaseAdapter{
private int[]src;
private Context context;
public ImageAdapter(int[]src,Context context) {
this.context=context;
this.src=src;
}
//返回数据源的数量
// 无限循环显示图片
public int getCount() {
return Integer.MAX_VALUE;
}
//告诉适配器取得目前容器中数据Id和对象
@Override
public Object getItem(int arg0) {
// TODO 自动生成的方法存根
return src[arg0];
}
@Override
public long getItemId(int position) {
// TODO 自动生成的方法存根
return position;
}
//取得目前欲显示的图像View，传入数组ID值对图像进行返回
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ImageView image=new ImageView(context);//由于这里没有Activity所以在构造函数里返回上下文
//image.setBackgroundResource(src[position]);加载对象资源
//无限循环时加载的图片的指数position肯定会超过设定的数量，所以做求余处理
image.setBackgroundResource(src[position%src.length]);
image.setLayoutParams(new Gallery.LayoutParams(200, 200));//缩略图的宽和高
image.setScaleType(ScaleType.FIT_XY);//缩放模式，横向缩放
return image;
}
}public class MainActivity extends Activity implements OnItemSelectedListener,ViewFactory{
private Gallery gallery;
private int[]src={R.drawable.pic1,R.drawable.pic2,R.drawable.pic3,R.drawable.pic4,
R.drawable.pic5,R.drawable.pic6,R.drawable.pic7,R.drawable.pic8,R.drawable.pic9
};
private ImageSwitcher imageSwitch;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
gallery=(Gallery) findViewById(R.id.gallery);
imageSwitch=(ImageSwitcher) findViewById(R.id.imageSwitcher);
ImageAdapter adapter=new ImageAdapter(src, this);//为适配器使用命名
gallery.setAdapter(adapter);//加载适配器
gallery.setOnItemSelectedListener(this);
imageSwitch.setFactory(this);
//添加安卓自带的动画效果，淡入淡出
imageSwitch.setInAnimation(AnimationUtils.loadAnimation(this, android.R.anim.fade_in));
imageSwitch.setOutAnimation(AnimationUtils.loadAnimation(this,android.R.anim.fade_out));
}
@Override
public View makeView() {
ImageView image=new ImageView(this);
image.setScaleType(ScaleType.FIT_CENTER);//显示图片为等比例显示缩放，并居中
return image;
}
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
imageSwitch.setBackgroundResource(src[arg2%src.length]);//加载当前Gallery中显示的图片
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
}
}查看7条回复
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