文件上传可能是一个比較耗时的操作，假设为上传操作带上进度提示则能够更好的提高用户体验，最后效果例如以下图：
项目源代码：http://download.csdn.net/detail/shinay/4965230
这里仅仅贴出代码，可依据实际情况自行改动。
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package com.lxb.uploadwithprogress.http;
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import java.io.File;
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import org.apache.http.HttpResponse;
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import org.apache.http.client.HttpClient;
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import org.apache.http.client.methods.HttpPost;
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import org.apache.http.entity.mime.content.FileBody;
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import org.apache.http.impl.client.DefaultHttpClient;
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import org.apache.http.protocol.BasicHttpContext;
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import org.apache.http.protocol.HttpContext;
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import org.apache.http.util.EntityUtils;
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import android.app.ProgressDialog;
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import android.content.Context;
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import android.os.AsyncTask;
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import com.lxb.uploadwithprogress.http.CustomMultipartEntity.ProgressListener;
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public class HttpMultipartPost extends AsyncTask<String, Integer, String> {
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private Context context;
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private String filePath;
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private ProgressDialog pd;
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private long totalSize;
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public HttpMultipartPost(Context context, String filePath) {
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this.context = context;
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this.filePath = filePath;
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}
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@Override
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protected void onPreExecute() {
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pd = new ProgressDialog(context);
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pd.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
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pd.setMessage("Uploading Picture...");
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pd.setCancelable(false);
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pd.show();
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}
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@Override
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protected String doInBackground(String... params) {
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String serverResponse = null;
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HttpClient httpClient = new DefaultHttpClient();
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HttpContext httpContext = new BasicHttpContext();
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HttpPost httpPost = new HttpPost("上传URL， 如：http://www.xx.com/upload.php");
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try {
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CustomMultipartEntity multipartContent = new CustomMultipartEntity(
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new ProgressListener() {
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@Override
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public void transferred(long num) {
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publishProgress((int) ((num / (float) totalSize) * 100));
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}
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});
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multipartContent.addPart("data", new FileBody(new File(
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filePath)));
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totalSize = multipartContent.getContentLength();
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httpPost.setEntity(multipartContent);
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HttpResponse response = httpClient.execute(httpPost, httpContext);
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serverResponse = EntityUtils.toString(response.getEntity());
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} catch (Exception e) {
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e.printStackTrace();
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}
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return serverResponse;
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}
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@Override
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protected void onProgressUpdate(Integer... progress) {
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pd.setProgress((int) (progress[0]));
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}
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@Override
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protected void onPostExecute(String result) {
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System.out.println("result: " + result);
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pd.dismiss();
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}
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@Override
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protected void onCancelled() {
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System.out.println("cancle");
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}
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}
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package com.lxb.uploadwithprogress.http;
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import java.io.FilterOutputStream;
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import java.io.IOException;
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import java.io.OutputStream;
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import java.nio.charset.Charset;
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import org.apache.http.entity.mime.HttpMultipartMode;
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import org.apache.http.entity.mime.MultipartEntity;
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public class CustomMultipartEntity extends MultipartEntity {
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private final ProgressListener listener;
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public CustomMultipartEntity(final ProgressListener listener) {
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super();
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this.listener = listener;
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}
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public CustomMultipartEntity(final HttpMultipartMode mode,
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final ProgressListener listener) {
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super(mode);
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this.listener = listener;
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}
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public CustomMultipartEntity(HttpMultipartMode mode, final String boundary,
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final Charset charset, final ProgressListener listener) {
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super(mode, boundary, charset);
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this.listener = listener;
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}
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@Override
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public void writeTo(OutputStream outstream) throws IOException {
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super.writeTo(new CountingOutputStream(outstream, this.listener));
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}
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public static interface ProgressListener {
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void transferred(long num);
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}
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public static class CountingOutputStream extends FilterOutputStream {
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private final ProgressListener listener;
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private long transferred;
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public CountingOutputStream(final OutputStream out,
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final ProgressListener listener) {
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super(out);
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this.listener = listener;
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this.transferred = 0;
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}
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public void write(byte[] b, int off, int len) throws IOException {
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out.write(b, off, len);
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this.transferred += len;
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this.listener.transferred(this.transferred);
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}
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public void write(int b) throws IOException {
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out.write(b);
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this.transferred++;
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this.listener.transferred(this.transferred);
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}
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}
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}
上面为两个基本的类，以下放一个调用的Activity
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package com.lxb.uploadwithprogress;
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import java.io.File;
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import com.lxb.uploadwithprogress.http.HttpMultipartPost;
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import android.app.Activity;
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import android.content.Context;
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import android.os.Bundle;
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import android.view.View;
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import android.view.View.OnClickListener;
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import android.widget.Button;
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import android.widget.EditText;
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import android.widget.Toast;
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public class MainActivity extends Activity implements OnClickListener {
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private Context context;
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private EditText et_filepath;
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private Button btn_upload;
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private Button btn_cancle;
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private HttpMultipartPost post;
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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context = this;
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setContentView(R.layout.activity_main);
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et_filepath = (EditText) findViewById(R.id.et_filepath);
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btn_upload = (Button) findViewById(R.id.btn_upload);
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btn_cancle = (Button) findViewById(R.id.btn_cancle);
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btn_upload.setOnClickListener(this);
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btn_cancle.setOnClickListener(this);
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}
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@Override
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public void onClick(View v) {
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switch (v.getId()) {
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case R.id.btn_upload:
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String filePath = et_filepath.getText().toString();
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File file = new File(filePath);
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if (file.exists()) {
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post = new HttpMultipartPost(context, filePath);
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post.execute();
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} else {
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Toast.makeText(context, "file not exists", Toast.LENGTH_LONG).show();
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}
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break;
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case R.id.btn_cancle:
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if (post != null) {
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if (!post.isCancelled()) {
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post.cancel(true);
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}
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}
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break;
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}
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}
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}
当然，在Android中使用MultipartEntity类，必须为项目添加对应的jar包，httpmime-4.1.2.jar。
最后放上代码。project里已包括jar。
地址：
http://download.csdn.net/detail/shinay/4965230
