我从我的画廊收到所有图片.(三星galaxy s5的照片)
我可以从Viewpager查看图像.
但是当我开始Swiping时.它太慢了.
几秒钟后,应用程序崩溃,没有logcat中的错误.
public class Paging extends PagerAdapter {
private ArrayList<String> IMAGES = new ArrayList<>();
private Context context;
private LayoutInflater layoutInflater;
public Paging(Context context) {
this.context = context;
}
@Override
public int getCount() {
return MainActivity.IMAGES.size();
}
@Override
public boolean isViewFromObject(View view, Object object) {
return (view == (LinearLayout) object);
}
@Override
public View instantiateItem(View container, int position) {
IMAGES = (ArrayList<String>) MainActivity.IMAGES.clone();
layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View item_view = layoutInflater.inflate(R.layout.imagepager_layout, (ViewGroup) container, false);
ImageView imageView = (ImageView) item_view.findViewById(R.id.img);
Picasso.with(context)
.load(IMAGES.get(position))
.placeholder(R.drawable.plusbtn)
.into(imageView);
((ViewGroup) container).addView(item_view);
return item_view;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView((LinearLayout) object);
}
}
我的viewPager添加适配器.
viewPager = (ViewPager)findViewById(R.id.view_pager);
adap = new Paging(MainActivity.this);
viewPager.setAdapter(adap);
我的XML ..
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:orientation="vertical">
<ImageView
android:id="@+id/img"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_gravity="center"
android:gravity="center" />
</LinearLayout>
我的观点是寻呼机.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
>
<android.support.v4.view.ViewPager
android:id="@+id/view_pager"
android:layout_width="match_parent"
android:layout_height="wrap_content"></android.support.v4.view.ViewPager>
</LinearLayout>
最佳答案 这很可能是因为加载的图像像素数据太多而不是必要的(以适应您的视图大小).如果您的图像尺寸很大,默认情况下Picasso会将图像的完整大小加载到内存中,从而导致帧速率慢和OOM异常.
快速解决方法是使用Picasso.with().load().resize(width,height).它将使Picasso能够将缩减采样版本的图像加载到内存中.在UI端,您可以为ImageView使用fitCenter比例类型.
但是,为了更好地理解这个概念,我建议在这里阅读更多有关此主题的Google开发者指南:Loading Large Bitmaps Efficiently