java - 在 Android ListView 中，加载圆形图像和文本的正确方法是什么？

Question

我正在尝试创建一个ListView，其中包含一个简单的圆形图像和textView，为了实现圆形图像，我创建了一个函数来使其圆形，因为我从json对象获取图像url作为我使用的httpurl另一个从中获取位图的函数..但看起来有些严重错误，因为 ListView 加载时间太长，甚至在我滚动时卡住。

公共(public)类 MyImageListAdapter 扩展了 ArrayAdapter {

private final Context context;
private final ArrayList<UserInfo> values;

String mother_name;

String mother_image;

public MyImageListAdapter(Activity atvt, Context context,
        ArrayList<UserInfo> values) {
    super(context, R.layout.my_list, values);
    this.context = context;
    this.values = values;

}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    LayoutInflater inflater = (LayoutInflater) context
            .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    View rowView = inflater.inflate(R.layout.image_name_fragment, parent,
            false);
    TextView textView = (TextView) rowView.findViewById(R.id.firstLine);

    ImageView imageView = (ImageView) rowView
            .findViewById(R.id.profileImage);

    textView.setText(((UserInfo) values.get(position)).getUserName());

    String motherImageURl = ((UserInfo) values.get(position))
            .getPrifileImageUr();

    mother_name = ((UserInfo) values.get(position)).getUserName();
    mother_image = motherImageURl;

    Bitmap bm = getBitmapFromHttpURL(motherImageURl);
    Bitmap bm1 = getRoundedCornerBitmapWithBorderSmall(bm, 2);

    imageView.setImageBitmap(bm1);

    rowView.setPadding(5, 10, 5, 10);

    return rowView;
}

public static Bitmap getBitmapFromHttpURL(String src) {
    Bitmap bitmap = null;
    AsyncTask<String, Void, Bitmap> ac = new AsyncTask<String, Void, Bitmap>() {

        @Override
        protected Bitmap doInBackground(String... params) {
            try {
                URL url = new URL(params[0]);
                HttpURLConnection connection = (HttpURLConnection) url
                        .openConnection();
                connection.setDoInput(true);
                connection.connect();
                InputStream input = connection.getInputStream();
                Bitmap myBitmap = BitmapFactory.decodeStream(input);
                myBitmap = Bitmap.createScaledBitmap(myBitmap, 200, 200,
                        true);

                return myBitmap;
            } catch (IOException e) {
                e.printStackTrace();
                return null;
            }

        }
    };
    try {
        bitmap = ac.execute(src).get();
    } catch (InterruptedException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (ExecutionException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

    // bitmap = Bitmap.createScaledBitmap(bitmap,200,200, true);

    return bitmap;

}

public static Bitmap getRoundedCornerBitmapWithBorderSmall(Bitmap bitmap,
        int border) {

    int w = bitmap.getWidth();
    int h = bitmap.getHeight();

    // if(w>50 || h>50){w=50;h=50;}

    int a, b;

    System.out.println("-------" + bitmap.getByteCount() + "--" + h + "---"
            + w);

    int radius = Math.min(h / 2, w / 2);
    a = Math.max(w, h);
    Bitmap output = Bitmap.createBitmap(a, a, Config.ARGB_8888);

    Paint p = new Paint();
    p.setAntiAlias(true);

    Canvas c = new Canvas(output);
    c.drawARGB(0, 0, 0, 0);
    p.setStyle(Style.FILL);

    c.drawCircle((w / 2) + 4, (h / 2) + 4, radius, p);

    p.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));

    c.drawBitmap(bitmap, 4, 4, p);
    p.setXfermode(null);
    p.setStyle(Style.STROKE);
    p.setColor(Color.parseColor("#61445C"));
    p.setStrokeWidth(border);
    c.drawCircle((w / 2) + 4, (h / 2) + 4, radius, p);
    // output = Bitmap.createScaledBitmap(output, 200, 200, true);
    // output=getResizedBitmap(output, 200,200) ;
    // Bitmap yourBitmap;
    output = Bitmap.createScaledBitmap(output, 100, 100, true);
    return output;

}

}

Answer 1

您可以使用Picasso用于使用单行代码直接从 URL 加载图像的库。

要使图像圆角可以引用我的答案 How to create round corner image using volley library android

还有一个对你的网络的建议，使用 Volley 库。这是为了更快更好的网络。