利用AsyncHttpClient实现图片的上传与下载

图片上传

        /**
	 * @param path
	 *            要上传的文件路径
	 * @param url
	 *            服务端接收URL
	 * @throws Exception
	 */
	 public static void uploadFile(String path, String url) throws Exception {
		File file = new File(path);
		if (file.exists() && file.length() > 0) {
			AsyncHttpClient client = new AsyncHttpClient();
			RequestParams params = new RequestParams();
			params.put("uploadfile", file);
			// 上传文件
			client.post(url, params, new AsyncHttpResponseHandler() {
				@Override
				public void onSuccess(int statusCode, Header[] headers,
						byte[] responseBody) {
					// 上传成功后要做的工作
					Toast.makeText(mContext, "上传成功", Toast.LENGTH_LONG).show();
					progress.setProgress(0);
				}

				@Override
				public void onFailure(int statusCode, Header[] headers,
						byte[] responseBody, Throwable error) {
					// 上传失败后要做到工作
					Toast.makeText(mContext, "上传失败", Toast.LENGTH_LONG).show();
				}

				@Override
				public void onProgress(int bytesWritten, int totalSize) {
					// TODO Auto-generated method stub
					super.onProgress(bytesWritten, totalSize);
					int count = (int) ((bytesWritten * 1.0 / totalSize) * 100);
					// 上传进度显示
					progress.setProgress(count);
					Log.e("上传 Progress>>>>>", bytesWritten + " / " + totalSize);
				}

				@Override
				public void onRetry(int retryNo) {
					// TODO Auto-generated method stub
					super.onRetry(retryNo);
					// 返回重试次数
				}

			});
		} else {
			Toast.makeText(mContext, "文件不存在", Toast.LENGTH_LONG).show();
		}

	}

图片下载

        /**
	 * @param url
	 *            要下载的文件URL
	 * @throws Exception
	 */
	 public static void downloadFile(String url) throws Exception {

		AsyncHttpClient client = new AsyncHttpClient();
		// 指定文件类型
		String[] allowedContentTypes = new String[] { "image/png", "image/jpeg" };
		// 获取二进制数据如图片和其他文件
		client.get(url, new BinaryHttpResponseHandler(allowedContentTypes) {

			@Override
			public void onSuccess(int statusCode, Header[] headers,
					byte[] binaryData) {
				String tempPath = Environment.getExternalStorageDirectory()
						.getPath() + "/temp.jpg";
				// TODO Auto-generated method stub
				// 下载成功后需要做的工作
				progress.setProgress(0);
				//
				Log.e("binaryData:", "共下载了：" + binaryData.length);
				//
				Bitmap bmp = BitmapFactory.decodeByteArray(binaryData, 0,
						binaryData.length);

				File file = new File(tempPath);
				// 压缩格式
				CompressFormat format = Bitmap.CompressFormat.JPEG;
				// 压缩比例
				int quality = 100;
				try {
					// 若存在则删除
					if (file.exists())
						file.delete();
					// 创建文件
					file.createNewFile();
					//
					OutputStream stream = new FileOutputStream(file);
					// 压缩输出
					bmp.compress(format, quality, stream);
					// 关闭
					stream.close();
					//
					Toast.makeText(mContext, "下载成功n" + tempPath,
							Toast.LENGTH_LONG).show();

				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}

			}

			@Override
			public void onFailure(int statusCode, Header[] headers,
					byte[] binaryData, Throwable error) {
				// TODO Auto-generated method stub
				Toast.makeText(mContext, "下载失败", Toast.LENGTH_LONG).show();
			}

			@Override
			public void onProgress(int bytesWritten, int totalSize) {
				// TODO Auto-generated method stub
				super.onProgress(bytesWritten, totalSize);
				int count = (int) ((bytesWritten * 1.0 / totalSize) * 100);
				// 下载进度显示
				progress.setProgress(count);
				Log.e("下载 Progress>>>>>", bytesWritten + " / " + totalSize);

			}

			@Override
			public void onRetry(int retryNo) {
				// TODO Auto-generated method stub
				super.onRetry(retryNo);
				// 返回重试次数
			}

		});
	}

PHP服务端

<?php
$base_path = "./upload/"; // 接收文件目录
$target_path = $base_path . basename ( $_FILES ['uploadfile'] ['name'] );
if (move_uploaded_file ( $_FILES ['uploadfile'] ['tmp_name'], $target_path )) {
	$array = array (
			"code" => "1",
			"message" => $_FILES ['uploadfile'] ['name'] 
	);
	echo json_encode ( $array );
} else {
	$array = array (
			"code" => "0",
			"message" => "There was an error uploading the file, please try again!" . $_FILES ['uploadfile'] ['error'] 
	);
	echo json_encode ( $array );
}
?>

Service中类似的异常问题：

(com.zajt.zajtsafechat.http.AsyncHttpResponseHandler$ResponderHandler) {42843450} sending message to a Handler on a dead thread

解决办法：

 在Service中，AsyncHttpClient client = new SyncHttpClient();

 在Activity中，AsyncHttpClient client = new AsyncHttpClient();

其中SyncHttpClient是AsyncHttpClient的子类

最后

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