Question

我有一个带有图像网址的字符串。

有人可以给我代码来实现吗？

以前所做的一切都不起作用。

到目前为止

代码：

 dlbtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                new DownloadImage().execute(id);
            }
        });

  public void saveImage(Context context, Bitmap b, String imageName)
    {
        FileOutputStream foStream;
        try
        {
            foStream = context.openFileOutput(imageName, Context.MODE_PRIVATE);
            b.compress(Bitmap.CompressFormat.PNG, 100, foStream);
            foStream.close();
        }
        catch (Exception e)
        {
            Log.d("saveImage", "Exception 2, Something went wrong!");
            e.printStackTrace();
        }
    }



    private class DownloadImage extends AsyncTask<String, Void, Bitmap> {
        private String TAG = "DownloadImage";
        private Bitmap downloadImageBitmap(String sUrl) {
            Bitmap bitmap = null;
            try {
                InputStream inputStream = new URL(sUrl).openStream();   // Download Image from URL
                bitmap = BitmapFactory.decodeStream(inputStream);       // Decode Bitmap
                inputStream.close();
            } catch (Exception e) {
                Log.d(TAG, "Exception 1, Something went wrong!");
                e.printStackTrace();
            }
            return bitmap;
        }

        @Override
        protected Bitmap doInBackground(String... params) {
            return downloadImageBitmap(params[0]);
        }

        protected void onPostExecute(Bitmap result) {
            saveImage(getApplicationContext(), result, "my_image.png");
        }
    }

public Bitmap loadImageBitmap（Context context，String imageName）{ Bitmap bitmap = null; FileInputStream fiStream; 尝试{ fiStream = context.openFileInput（imageName）; bitmap = BitmapFactory.decodeStream（fiStream）; fiStream.close（）; } catch（例外e）{ Log.d（“saveImage”，“例外3，出错了！”）; e.printStackTrace（）; } 返回位图; }

但没有任何反应。没有在图库中存储的图像，也不会显示toast

Answer 1

使用Picasso Library完成此任务

http://square.github.io/picasso/

Android：如何在给出Image-Url时制作图像下载按钮并将其保存在内部存储中

1 个答案: