小编Boo*_*han的帖子

我需要在列表页面中显示来自api的图像列表.为此,我使用了两种方法.

第一种方法:
通过将url转换为字节数组,然后将其转换为位图.请找到以下代码..

URL imageUrl = new URL(url);
URLConnection ucon = imageUrl.openConnection();

InputStream is = ucon.getInputStream();
BufferedInputStream bis = new BufferedInputStream(is);

ByteArrayBuffer baf = new ByteArrayBuffer(500);
int current = 0;
while ((current = bis.read()) != -1) {
     /* This approach slowdown the process*/
     baf.append((byte) current);
}

byte[] img_ary= baf.toByteArray();

将字节数组转换为位图:

ByteArrayInputStream imageStream = new ByteArrayInputStream(
                    imgUrl);
Bitmap theImage = BitmapFactory.decodeStream(imageStream);

第二种方法:
基于高度和宽度的图像缩放

private static final String TAG_iamge = "Image";
private static final int IO_BUFFER_SIZE = 4 * 1024;

public static …

我必须在android中使用单例模式.为了获得更好的性能,使用单例类是很好的.在我的应用程序API调用更多,所以我决定创建一个通用的解析类,用于解析值.我想将它设为单例,因此每个活动都使用此类,最后创建此类的单个实例.请就此提出建议.

public class parsingclass {
    Context context;

    public parsingclass(Context context) {
        this.context = context;
    }

    public void parsing methods()
    {
        //methods for parsing values
    }
}

//更新的代码

 public class Singleton {
    private static Singleton instance = null;

    //a private constructor so no instances can be made outside this class
    private Singleton() {}

    //Everytime you need an instance, call this
    public static Singleton getInstance() {
        if(instance == null)
            instance = new Singleton();

        return instance;
    }
    public List<String> parsing_home()
    {
        List<String> set=new …