Java-Android：进度条,用于将数据上传到服务器
作者：互联网
在我的应用程序中,有些数据包装在一个对象中.
我正在将此对象发送到服务器.一切正常.
在这里,我想显示数据加载到服务器时的进度条.
为此,我使用以下代码：
ProgressThread progThread;
ProgressDialog progDialog;
int typeBar;
int delay = 40;
int maxBarValue = 200;
@Override
protected Dialog onCreateDialog(int id) {
switch (id) {
case 1:
progDialog = new ProgressDialog(this);
progDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
progDialog.setMax(maxBarValue);
progDialog.setMessage("Data uploading to the Server..");
progThread = new ProgressThread(handler);
progThread.start();
return progDialog;
default:
return null;
}
}
final Handler handler = new Handler() {
public void handleMessage(Message msg) {
// Get the current value of the variable total from the message data
// and update the progress bar.
int total = msg.getData().getInt("total");
progDialog.setProgress(total);
if (total <= 0) {
dismissDialog(typeBar);
progThread.setState(ProgressThread.DONE);
}
}
};
private class ProgressThread extends Thread {
final static int DONE = 0;
final static int RUNNING = 1;
Handler mHandler;
int mState;
int total;
ProgressThread(Handler h) {
mHandler = h;
}
@Override
public void run() {
mState = RUNNING;
total = maxBarValue;
while (mState == RUNNING) {
connectServerClass.saveOnServer(Object);
Message msg = mHandler.obtainMessage();
Bundle b = new Bundle();
b.putInt("total", total);
msg.setData(b);
mHandler.sendMessage(msg);
total--; // Count down
}
}
public void setState(int state) {
mState = state;
}
}
当用户单击按钮时：
typeBar = 1;
showDialog(typeBar);
connectServerClass.saveOnServer(Object)
通过以上行,我正在将对象发送到服务器.实际上,我正在将数据发送到另一个类,即connectServerClass,并且该类将对象发送到服务器.
但是此代码无法正常工作.这段代码会长时间连接到服务器.
我使用以下代码：
private class Uploader extends AsyncTask<Void, String, Integer>
{
private List<File> files;
private boolean canceled;
private int uploaded;
private Account account;
private ProgressDialog uploadSeekBar;
public Uploader(Account a, List<File> files)
{
this.account = a;
this.files = files;
}
@Override
protected void onPreExecute()
{
uploadSeekBar.setMax(files.size());
uploadSeekBar.setProgress(0);
uploadSeekBar.setVisibility(View.VISIBLE); //Error: the method setVisibility is undefined
}
@Override
protected void onPostExecute(Integer result)
{
uploadSeekBar.setVisibility(View.INVISIBLE);
Toast.makeText(Upload.this, result + " files uploaded", // Error: Upload cannot be resolved to a type
Toast.LENGTH_LONG).show();
}
@Override
protected void onCancelled()
{
// XXX need a way to actually cancel the last upload
Toast.makeText(Upload.this, "canceling upload", Toast.LENGTH_LONG)
.show();
this.canceled = true;
uploadSeekBar.setVisibility(View.INVISIBLE);
}
@Override
protected Integer doInBackground(Void... voids)
{
uploaded = 0;
try
{
Iterator<File> it = this.files.iterator();
while (!canceled && it.hasNext())
{
File file = it.next();
it.remove();
String msg = "";
try
{
if (debugMode) // what is this debugMode
{
//Put your uploading code here.
msg = ("fake uploading " + file);
Thread.sleep(3000);
} else
{
msg = ("uploading: " + file);
controller.uploadFile(file, this.account); //Error: controller cannot be resolved
}
uploaded++;
publishProgress(msg);
} catch (IOException e)
{
controller.te("error uploading file: " + file);
controller.te("error uploading file: " + e);
} catch (InterruptedException e)
{
}
}
} catch (Exception e)
{
publishProgress("error uploading: " + e);
}
return uploaded;
}
@Override
protected void onProgressUpdate(String... strings)
{
uploadSeekBar.setProgress(uploaded);
updateUploadMessage(files.size());
Toast.makeText(Upload.this, strings[0], Toast.LENGTH_LONG).show(); //Error: The method updateUploadMessage(int) is undefined for the type FirstActivity.Uploader
}
}
但是我遇到了一些错误,我在该行的右侧提到了这一点.请给我建议.
解决方法:
我强烈建议您使用AsyncTask.
下面的代码段将帮助您了解AsyncTask的外观.
package org.sample;
import java.io.File;
import java.io.IOException;
import java.util.Iterator;
import java.util.List;
import android.accounts.Account;
import android.os.AsyncTask;
import android.view.View;
import android.widget.Toast;
private class Uploader extends AsyncTask<Void, String, Integer>
{
private List<File> files;
private boolean canceled;
private int uploaded;
public Uploader(Account a, List<File> files)
{
this.account = a;
this.files = files;
}
@Override
protected void onPreExecute()
{
uploadSeekBar.setMax(files.size());
uploadSeekBar.setProgress(0);
uploadSeekBar.setVisibility(View.VISIBLE);
}
@Override
protected void onPostExecute(Integer result)
{
uploadSeekBar.setVisibility(View.INVISIBLE);
Toast.makeText(Upload.this, result + " files uploaded",
Toast.LENGTH_LONG).show();
}
@Override
protected void onCancelled()
{
// XXX need a way to actually cancel the last upload
Toast.makeText(Upload.this, "canceling upload", Toast.LENGTH_LONG)
.show();
this.canceled = true;
uploadSeekBar.setVisibility(View.INVISIBLE);
}
@Override
protected Integer doInBackground(Void... voids)
{
uploaded = 0;
try
{
Iterator<File> it = this.files.iterator();
while (!canceled && it.hasNext())
{
File file = it.next();
it.remove();
String msg = "";
try
{
if (debugMode)
{
//Put your uploading code here.
msg = ("fake uploading " + file);
Thread.sleep(3000);
} else
{
msg = ("uploading: " + file);
controller.uploadFile(file, this.account);
}
uploaded++;
publishProgress(msg);
} catch (IOException e)
{
controller.te("error uploading file: " + file);
controller.te("error uploading file: " + e);
} catch (InterruptedException e)
{
}
}
} catch (Exception e)
{
publishProgress("error uploading: " + e);
}
return uploaded;
}
@Override
protected void onProgressUpdate(String... strings)
{
uploadSeekBar.setProgress(uploaded);
updateUploadMessage(files.size());
Toast.makeText(Upload.this, strings[0], Toast.LENGTH_LONG).show();
}
}
标签：progress-bar,java,android 来源： https://codeday.me/bug/20191201/2079160.html