小计-保存网络图片

全局变量

   private static final int SAVE_SUCCESS = 0;//保存图片成功
    private static final int SAVE_FAILURE = 1;//保存图片失败
    private static final int SAVE_BEGIN = 2;//开始保存图片

点击事件
子线程保存图片

 new Thread(new Runnable() {
                    @Override
                    public void run() {
                        mHandler.obtainMessage(SAVE_BEGIN).sendToTarget();
                        Bitmap bitmap = returnBitMap(url);
                        saveImageToPhotos(context,bitmap);
                    }
                }).start();

handler

    private Handler mHandler = new Handler(new Handler.Callback() {
        @Override
        public boolean handleMessage(@NonNull Message msg) {
            switch (msg.what) {
                case SAVE_BEGIN:
                    AllUtils.MyToast(context,"开始保存图片...");
                    break;
                case SAVE_SUCCESS:
                    AllUtils.MyToast(context,"图片保存成功,请到相册查找");
                    break;
                case SAVE_FAILURE:
                    AllUtils.MyToast(context,"图片保存失败,请稍后再试...");
                    break;
            }
            return true;
        }
    });

保存图片的方法

private void saveImageToPhotos(Context context, Bitmap bmp) {
        // 首先保存图片
        File appDir = new File(Environment.getExternalStorageDirectory(), "Boohee");
        if (!appDir.exists()) {
            appDir.mkdir();
        }
        String fileName = System.currentTimeMillis() + ".jpg";
        File file = new File(appDir, fileName);
        try {
            FileOutputStream fos = new FileOutputStream(file);
            bmp.compress(Bitmap.CompressFormat.JPEG, 100, fos);
            fos.flush();
            fos.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        // 其次把文件插入到系统图库
        try {
            MediaStore.Images.Media.insertImage(context.getContentResolver(),
                    file.getAbsolutePath(), fileName, null);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
            mHandler.obtainMessage(SAVE_FAILURE).sendToTarget();
            return;
        }
        // 最后通知图库更新
        Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
        Uri uri = Uri.fromFile(file);
        intent.setData(uri);
        context.sendBroadcast(intent);
        mHandler.obtainMessage(SAVE_SUCCESS).sendToTarget();
    }

返回bitmap的方法

public final static Bitmap returnBitMap(String url) {
        URL myFileUrl;
        Bitmap bitmap = null;
        try {
            myFileUrl = new URL(url);
            HttpURLConnection conn;
            conn = (HttpURLConnection) myFileUrl.openConnection();
            conn.setDoInput(true);
            conn.connect();
            InputStream is = conn.getInputStream();
            bitmap = BitmapFactory.decodeStream(is);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return bitmap;
    }