我想让用户能够取消下载。我的下载和进度条工作得很好。我希望能够添加取消下载..这是我的活动类代码:
package com.afromusics.afromusic;
import java.io.BufferedInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;
import java.net.URLConnection;
import android.app.Dialog;
import android.app.ProgressDialog;
import android.content.Intent;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
public class DownloadActivity extends ActionBarActivity {
public static final int DIALOG_DOWNLOAD_PROGRESS = 0;
private Button startBtn;
private ProgressDialog mProgressDialog;
private final String KEY_TITLE = "Afromusics_file";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_download);
TextView titlema = (TextView) findViewById(R.id.textView1);
Intent intenttitle = getIntent();
String titlem = intenttitle.getStringExtra("blogTitleKey");
titlema.setText(titlem);
startBtn = (Button)findViewById(R.id.startBtn);
startBtn.setOnClickListener(new OnClickListener(){
public void onClick(View v) {
startDownload();
}
});
}
private void startDownload() {
Intent intent = getIntent();
Uri fileUri = intent.getData();
String url = fileUri.toString();
new DownloadFileAsync().execute(url);
}
@Override
protected Dialog onCreateDialog(int id) {
switch (id) {
case DIALOG_DOWNLOAD_PROGRESS:
mProgressDialog = new ProgressDialog(this);
mProgressDialog.setMessage("Downloading file..");
mProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
mProgressDialog.setCancelable(false);
mProgressDialog.show();
return mProgressDialog;
default:
return null;
}
}
class DownloadFileAsync extends AsyncTask<String, String, String> {
@SuppressWarnings("deprecation")
@Override
protected void onPreExecute() {
super.onPreExecute();
showDialog(DIALOG_DOWNLOAD_PROGRESS);
}
@Override
protected String doInBackground(String... aurl) {
int count;
try {
URL url = new URL(aurl[0]);
URLConnection conexion = url.openConnection();
conexion.connect();
int lenghtOfFile = conexion.getContentLength();
Log.d("ANDRO_ASYNC", "Lenght of file: " + lenghtOfFile);
//Randow Number Works perfect
//Random r = new Random();
//int i1 = r.nextInt(80 - 65) + 65;
Intent intenttitle = getIntent();
String titlem = intenttitle.getStringExtra("blogTitleKey");
InputStream input = new BufferedInputStream(url.openStream());
OutputStream output = new FileOutputStream("/sdcard/Music/ " + titlem + ".mp3");
byte data[] = new byte[1024];
long total = 0;
while ((count = input.read(data)) != -1) {
total += count;
publishProgress(""+(int)((total*100)/lenghtOfFile));
output.write(data, 0, count);
}
output.flush();
output.close();
input.close();
} catch (Exception e) {}
return null;
}
protected void onProgressUpdate(String... progress) {
Log.d("ANDRO_ASYNC",progress[0]);
mProgressDialog.setProgress(Integer.parseInt(progress[0]));
}
@SuppressWarnings("deprecation")
@Override
protected void onPostExecute(String unused) {
dismissDialog(DIALOG_DOWNLOAD_PROGRESS);
}
}
}
这是活动文件:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/cream_dustapp"
tools:context="com.afromusics.afromusic.DownloadActivity" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="32sp" />
<Button
android:id="@+id/startBtn"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/textView1"
android:layout_below="@+id/textView1"
android:layout_marginTop="18dp"
android:text="@string/download_btn" />
</RelativeLayout>
答案 0 :(得分:2)
我认为数据答案并不完全符合您的要求。它只是取消了ProgressBar。要停止Asynctask,我会这样做:
向您的活动添加全局变量
private boolean running = false;
然后在onCreateDialog
方法中,在这些行之间添加:
mProgressDialog.setCancelable(true);
running = true;
mProgressDialog.setButton(ProgressDialog.BUTTON_NEGATIVE, "Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
//Cancel download task
running = false;
mProgressDialog.cancel();
}
});
mProgressDialog.show();
最后在AsyncTask的doInBackground
方法中更改这些行:
while (running && (count = input.read(data)) != -1) {
total += count;
publishProgress(""+(int)((total*100)/lenghtOfFile));
output.write(data, 0, count);
}
这些将完成AsyncTask或更精确的while循环。确保您正在处理ProgressDialog上的每个帖子操作,例如在您的OnPostDialog权限中解除。例如:Dialog将被解雇。
希望这有帮助!
答案 1 :(得分:0)
使用此示例。
public class Test extends Activity
{
public static final int DIALOG_DOWNLOAD_PROGRESS = 0;
private Button startBtn;
private ProgressDialog mProgressDialog;
private final String KEY_TITLE = "Afromusics_file";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mProgressDialog.setCancelable(true);
mProgressDialog.setButton(ProgressDialog.BUTTON_NEGATIVE, "Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
//Cancel download task
mProgressDialog.cancel();
}
});
}
}