上传带有进度条的大文件，Android中没有OutOfMemory错误 [英] Upload large file with progress bar and without OutOfMemory Error in Android
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问题描述
我在上传大型视频文件的时候遇到了一些问题（高达150MB）
<1>当我使用这个代码 Link1 。我可以上传带有进度条的小文件，但由于我的文件很大，所以android会给我提供 OutOfMemory Error 。 b
$ b
2.如果我使用此代码 Link2 。我能够上传大文件（这真的是一个很好的解决方案），但不知道如何显示progess（如20％完成或80％完成等）。所以请指导我。
解决方案
最后，我得到了我的问题的解决方案，我想分享它...
1。第一个解决方案 Link1 这个解决方案适用于像上传图片的小文件，最高可达15MB。但是我可以如果文件非常大，则不会从OutOfMemory错误中清除。第二种解决方案（ Link2 ）真的是一个很好的解决方案，并显示进度条我使用了一个自定义的MultipartEntity类。代码在这里：
import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.charset.Charset;
导入org.apache.http.entity.mime.HttpMultipartMode;
import org.apache.http.entity.mime.MultipartEntity;
public class CustomMultiPartEntity extends MultipartEntity
{
private final ProgressListener listener;
$ b $ public CustomMultiPartEntity（final ProgressListener listener）
{
super（）;
this.listener = listener;
$ b $ public public CustomMultiPartEntity（final HttpMultipartMode mode，final ProgressListener listener）
{
super（mode）;
this.listener = listener;
$ b $ public CustomMultiPartEntity（HttpMultipartMode mode，final String boundary，final Charset charset，final ProgressListener listener）
{
super（mode，boundary，charset）;
this.listener = listener;
$ b @Override
public void writeTo（final OutputStream outstream）throws IOException
{
super.writeTo（new CountingOutputStream（outstream，this.listener ））;
public static interface ProgressListener
{
void transferred（long num）;
public static class CountingOutputStream extends FilterOutputStream
{
private final ProgressListener listener;私人长期转移
;
public CountingOutputStream（final OutputStream out，final ProgressListener listener）
{
super（out）;
this.listener = listener;
this.transferred = 0;
$ b $ public void write（byte [] b，int off，int len）throws IOException
{
out.write（b，off，len）;
this.transferred + = len;
this.listener.transferred（this.transferred）;
public void write（int b）throws IOException
{
out.write（b）;
this.transferred ++;
this.listener.transferred（this.transferred）;
$ b code
$ b 我的活动代码是
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
导入java.net.HttpURLConnection;
导入java.net.MalformedURLException;
import java.net.URL;
导入org.apache.http.HttpEntity;
导入org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
导入org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.mime.HttpMultipartMode;
import org.apache.http.entity.mime.MultipartEntity;
import org.apache.http.entity.mime.content.FileBody;
import org.apache.http.entity.mime.content.StringBody;
import org.apache.http.impl.client.DefaultHttpClient;
导入org.apache.http.util.EntityUtils;
import com.example.fileupload.CustomMultiPartEntity.ProgressListener;
导入android.app.Activity;
导入android.os.AsyncTask;
导入android.os.Bundle;
导入android.view.View;
导入android.view.View.OnClickListener;
导入android.widget.ProgressBar;
导入android.widget.TextView;
public class MainActivity extends Activity实现OnClickListener {
private ProgressBar pb;
private final String filename =/mnt/sdcard/vid.mp4;
// private final String filename =/mnt/sdcard/a.3gp;
private String urlString =http://10.0.2.2:8080/FileUploadServlet1/UploadServlet;
私人TextView电视;
long totalSize = 0;
@Override
protected void onCreate（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）;
setContentView（R.layout.activity_main）;
tv =（TextView）findViewById（R.id.textView1）;
findViewById（R.id.button1）.setOnClickListener（this）;
tv.setText（init）;
pb =（ProgressBar）findViewById（R.id.progressBar1）;
$ b private class Uploadtask extends AsyncTask< Void，Integer，String> {
@Override
protected void onPreExecute（）{
pb.setProgress（0）;
tv.setText（shuru）;
super.onPreExecute（）;
$ b @Override
保护无效onProgressUpdate（整数...进展）{
pb.setProgress（progress [0]）;
$ b @Override
保护字符串doInBackground（Void ... params）{
return upload（）;
private String upload（）{
String responseString =no;
文件sourceFile =新文件（文件名）;
if（！sourceFile.isFile（））{
returnnot a file;
}
HttpClient httpclient = new DefaultHttpClient（）;
HttpPost httppost = new HttpPost（urlString）;
$ {
CustomMultiPartEntity entity = new CustomMultiPartEntity（new ProgressListener（）{
$ b @Override
public void transferred（long num） {
publishProgress（（int）（（num /（float）totalSize）* 100））;
}
}）;
entity.addPart（type，new StringBody（video））;
entity.addPart（uploadedfile，新的FileBody（sourceFile））;
totalSize = entity.getContentLength（）;
httppost.setEntity（entity）;
HttpResponse响应= httpclient.execute（httppost）;
HttpEntity r_entity = response.getEntity（）;
responseString = EntityUtils.toString（r_entity）;
$ b $ catch（ClientProtocolException e）{
responseString = e.toString（）;
} catch（IOException e）{
responseString = e.toString（）;
}
return responseString;
@Override
protected void onPostExecute（String result）{
tv.setText（result）;
super.onPostExecute（result）;
}
$ b @Override
public void onClick（View v）{
// TODO自动生成的方法存根
new Uploadtask（）。execute（）;
}
}
I am having some problem while uploading large video file(upto 150MB)
1.When I use this code Link1 .I able to upload small file with progress bar ,but as my file is large so android give me OutOfMemory Error.
2.If I use this code Link2. i am able to upload large file(this is really a good solution) but don't know how to show progess(like 20% complete or 80% complete and so on).so Please guide me.
解决方案 Finally I got solution of my question I want to share it ...
1.First solution Link1 This solution is ok with small files like image upload upto 15MB .But I could not get rid from OutOfMemory error if file is very large.
2.Second solution(Link2) is really a good solution and for showing progress bar I used a custom MultipartEntity class. Code is here:
import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.charset.Charset;
import org.apache.http.entity.mime.HttpMultipartMode;
import org.apache.http.entity.mime.MultipartEntity;
public class CustomMultiPartEntity extends MultipartEntity
{
private final ProgressListener listener;
public CustomMultiPartEntity(final ProgressListener listener)
{
super();
this.listener = listener;
}
public CustomMultiPartEntity(final HttpMultipartMode mode, final ProgressListener listener)
{
super(mode);
this.listener = listener;
}
public CustomMultiPartEntity(HttpMultipartMode mode, final String boundary, final Charset charset, final ProgressListener listener)
{
super(mode, boundary, charset);
this.listener = listener;
}
@Override
public void writeTo(final OutputStream outstream) throws IOException
{
super.writeTo(new CountingOutputStream(outstream, this.listener));
}
public static interface ProgressListener
{
void transferred(long num);
}
public static class CountingOutputStream extends FilterOutputStream
{
private final ProgressListener listener;
private long transferred;
public CountingOutputStream(final OutputStream out, final ProgressListener listener)
{
super(out);
this.listener = listener;
this.transferred = 0;
}
public void write(byte[] b, int off, int len) throws IOException
{
out.write(b, off, len);
this.transferred += len;
this.listener.transferred(this.transferred);
}
public void write(int b) throws IOException
{
out.write(b);
this.transferred++;
this.listener.transferred(this.transferred);
}
}
}
And my activity code is
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.mime.HttpMultipartMode;
import org.apache.http.entity.mime.MultipartEntity;
import org.apache.http.entity.mime.content.FileBody;
import org.apache.http.entity.mime.content.StringBody;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import com.example.fileupload.CustomMultiPartEntity.ProgressListener;
import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ProgressBar;
import android.widget.TextView;
public class MainActivity extends Activity implements OnClickListener {
private ProgressBar pb;
private final String filename = "/mnt/sdcard/vid.mp4";
// private final String filename = "/mnt/sdcard/a.3gp";
private String urlString = "http://10.0.2.2:8080/FileUploadServlet1/UploadServlet";
private TextView tv;
long totalSize = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tv = (TextView) findViewById(R.id.textView1);
findViewById(R.id.button1).setOnClickListener(this);
tv.setText("init");
pb = (ProgressBar) findViewById(R.id.progressBar1);
}
private class Uploadtask extends AsyncTask<Void, Integer, String> {
@Override
protected void onPreExecute() {
pb.setProgress(0);
tv.setText("shuru");
super.onPreExecute();
}
@Override
protected void onProgressUpdate(Integer... progress) {
pb.setProgress(progress[0]);
}
@Override
protected String doInBackground(Void... params) {
return upload();
}
private String upload() {
String responseString = "no";
File sourceFile = new File(filename);
if (!sourceFile.isFile()) {
return "not a file";
}
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(urlString);
try {
CustomMultiPartEntity entity=new CustomMultiPartEntity(new ProgressListener() {
@Override
public void transferred(long num) {
publishProgress((int) ((num / (float) totalSize) * 100));
}
});
entity.addPart("type", new StringBody("video"));
entity.addPart("uploadedfile", new FileBody(sourceFile));
totalSize = entity.getContentLength();
httppost.setEntity(entity);
HttpResponse response = httpclient.execute(httppost);
HttpEntity r_entity = response.getEntity();
responseString = EntityUtils.toString(r_entity);
} catch (ClientProtocolException e) {
responseString = e.toString();
} catch (IOException e) {
responseString = e.toString();
}
return responseString;
}
@Override
protected void onPostExecute(String result) {
tv.setText(result);
super.onPostExecute(result);
}
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
new Uploadtask().execute();
}
}
这篇关于上传带有进度条的大文件，Android中没有OutOfMemory错误的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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