我想在android中创建一个下载管理器，这样如果我的应用程序被最小化或关闭或被用户杀死，则再次下载以继续。 这个代码，我使用它，当后退按钮按下，在后台运行，但当用户杀死应用程序时，下载停止！ 有人有提议解决这个问题吗？
我在MainActivity上使用此代码：
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;
public class MainActivity extends Activity {
private TextView textView;
Thread thread;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textView = (TextView) findViewById(R.id.status);
}
public void onClick(View view) {
Thread thread = new Thread(new Runnable() {
public void run()
{
try {
Intent intent = new Intent(MainActivity.this, DownloadService.class);
intent.putExtra("filename", "index.mp3");
intent.putExtra("urlpath",
"http://s1.mihandownload.com/2015/saeedahmadi/Technology-mihandownload-com.rar");
startService(intent);
textView.setText("Service started");
} catch(Exception v) {
System.out.println(v);
}
}});
thread.start();
}
}
和我的DownloadService上的代码
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import android.annotation.TargetApi;
import android.app.Activity;
import android.app.IntentService;
import android.app.NotificationManager;
import android.content.Context;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Build;
import android.os.Environment;
import android.support.v4.app.NotificationCompat;
import android.support.v4.app.NotificationCompat.Builder;
import android.util.Log;
import android.widget.ProgressBar;
public class DownloadService extends IntentService {
ProgressBar progressBar;
NotificationManager mNotifyManager;
Builder mBuilder;
int id = 1;
HttpURLConnection connection;
String DESTINATION_PATH;
Activity myActivity;
float val=0.0f;
public DownloadService() {
super("DownloadService");
}
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
@Override
protected void onHandleIntent(Intent intent) {
mNotifyManager =(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
mBuilder = new NotificationCompat.Builder(this);
mBuilder.setContentTitle("Picture Download")
.setContentText("Download in progress")
.setSmallIcon(R.drawable.ic_launcher);
mBuilder.setOngoing(true);
mBuilder.setProgress(100, 0, false);
mNotifyManager.notify(id, mBuilder.build());
String URL = intent.getStringExtra("urlpath");
String DESTINATION_PATH = intent.getStringExtra("filename");
AsyncDownload asyncCallWS = new AsyncDownload();
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB)
asyncCallWS.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, URL,DESTINATION_PATH);
else
asyncCallWS.execute(URL,DESTINATION_PATH);
}
private class AsyncDownload extends AsyncTask<String, Void, Void> {
String fileName="";
@Override
protected Void doInBackground(String... params) {
fileName = params[1];
downloadFile(params[0], getFilename(params[1]));
return null;
}
@Override
protected void onPostExecute(Void result) {
Log.i("AsyncDownload", "onPostExecute");
Log.i("AsyncDownload", fileName);
}
}
private void downloadFile(String myUrl, String DESTINATION_PATH) {
try{
URL url = new URL(myUrl);
connection = (HttpURLConnection) url.openConnection();
int downloaded = 0;
File file=new File(DESTINATION_PATH);
if(file.exists()){
if(file.length()!=0){
downloaded = (int) file.length();
}
}
connection.setRequestProperty("Range", "bytes=" + downloaded + "-");
connection.setDoInput(true);
connection.setDoOutput(true);
BufferedInputStream in = new BufferedInputStream(connection.getInputStream());
FileOutputStream fos;
if(downloaded==0){
fos = new FileOutputStream(DESTINATION_PATH);
}else{
fos = new FileOutputStream(DESTINATION_PATH,true);
}
setProgres(((file.length()*1.0f)/connection.getContentLength())*100);
BufferedOutputStream bout = new BufferedOutputStream(fos, 1024);
byte[] data = new byte[1024];
int x = 0;
while ((x = in.read(data, 0, 1024)) >= 0) {
bout.write(data, 0, x);
downloaded += x;
Log.e("file Name", DESTINATION_PATH);
setProgres(((file.length()*1.0f)/connection.getContentLength())*100);
}
bout.close();
fos.close();
}catch(Exception exception){
exception.printStackTrace();
}
}
private String getFilename(String fileName) {
String filepath = Environment.getExternalStorageDirectory()+"/test/"+fileName;
return filepath;
}
private void setProgres(final float value) {
Log.e("",String.valueOf(value));
mBuilder.setProgress(100, (int)value, false);
mNotifyManager.notify(id, mBuilder.build());
}
}