我正在使用下载管理器从互联网上下载文件，并在活动中添加了一个进度条。我想根据进度条获取下载文件的百分比，到Android中的文本框。这就是我现在所做的。
protected ProgressBar mProgressBar;
protected long downloadId;
private DownloadManager downloadmanager;
public void startDownload() {
String servicestring = Context.DOWNLOAD_SERVICE;
downloadmanager = (DownloadManager) getSystemService(servicestring);
Uri uri = Uri
.parse("http://filename.mp3");
DownloadManager.Request request = new DownloadManager.Request(uri);
request.setDestinationInExternalPublicDir("/Download", "Sinhala.mp3");
downloadId = downloadmanager.enqueue(request);
mProgressBar = (ProgressBar)findViewById(R.id.progress_bar);
Timer myTimer = new Timer();
myTimer.schedule(new TimerTask() {
@Override
public void run() {
DownloadManager.Query q = new DownloadManager.Query();
q.setFilterById(downloadId);
Cursor cursor = downloadmanager.query(q);
cursor.moveToFirst();
int bytes_downloaded = cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_BYTES_DOWNLOADED_SO_FAR));
int bytes_total = cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_TOTAL_SIZE_BYTES));
cursor.close();
final int dl_progress = (bytes_downloaded * 100 / bytes_total);
runOnUiThread(new Runnable(){
@Override
public void run(){
mProgressBar.setProgress(dl_progress);
}
});
}
}, 0, 10);
}
答案 0 :(得分：0)
检查此代码
public class MainActivity extends AppCompatActivity {
private ThinDownloadManager downloadManager;
private static final int DOWNLOAD_THREAD_POOL_SIZE = 4;
Button mDownload1;
Button mDownload2;
Button mDownload3;
Button mDownload4;
Button mDownload5;
Button mStartAll;
Button mCancelAll;
Button mListFiles;
ProgressBar mProgress1;
ProgressBar mProgress2;
ProgressBar mProgress3;
ProgressBar mProgress4;
ProgressBar mProgress5;
TextView mProgress1Txt;
TextView mProgress2Txt;
TextView mProgress3Txt;
TextView mProgress4Txt;
TextView mProgress5Txt;
private static final String FILE1 = "https://dl.dropboxusercontent.com/u/25887355/test_photo1.JPG";
private static final String FILE2 = "https://dl.dropboxusercontent.com/u/25887355/test_photo2.jpg";
private static final String FILE3 = "https://dl.dropboxusercontent.com/u/25887355/test_song.mp3";
private static final String FILE4 = "https://dl.dropboxusercontent.com/u/25887355/test_video.mp4";
private static final String FILE5 = "http://httpbin.org/headers";
private static final String FILE6 = "https://dl.dropboxusercontent.com/u/25887355/ThinDownloadManager.tar.gz";
MyDownloadDownloadStatusListenerV1
myDownloadStatusListener = new MyDownloadDownloadStatusListenerV1();
int downloadId1;
int downloadId2;
int downloadId3;
int downloadId4;
int downloadId5;
int downloadId6;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mDownload1 = (Button) findViewById(R.id.button1);
mDownload2 = (Button) findViewById(R.id.button2);
mDownload3 = (Button) findViewById(R.id.button3);
mDownload4 = (Button) findViewById(R.id.button4);
mDownload5 = (Button) findViewById(R.id.button_download_headers);
mStartAll = (Button) findViewById(R.id.button5);
mCancelAll = (Button) findViewById(R.id.button6);
mListFiles = (Button) findViewById(R.id.button7);
mProgress1Txt = (TextView) findViewById(R.id.progressTxt1);
mProgress2Txt = (TextView) findViewById(R.id.progressTxt2);
mProgress3Txt = (TextView) findViewById(R.id.progressTxt3);
mProgress4Txt = (TextView) findViewById(R.id.progressTxt4);
mProgress5Txt = (TextView) findViewById(R.id.progressTxt5);
mProgress1 = (ProgressBar) findViewById(R.id.progress1);
mProgress2 = (ProgressBar) findViewById(R.id.progress2);
mProgress3 = (ProgressBar) findViewById(R.id.progress3);
mProgress4 = (ProgressBar) findViewById(R.id.progress4);
mProgress5 = (ProgressBar) findViewById(R.id.progress5);
mProgress1.setMax(100);
mProgress1.setProgress(0);
mProgress2.setMax(100);
mProgress2.setProgress(0);
mProgress3.setMax(100);
mProgress3.setProgress(0);
mProgress4.setMax(100);
mProgress4.setProgress(0);
mProgress5.setMax(100);
mProgress5.setProgress(0);
downloadManager = new ThinDownloadManager(DOWNLOAD_THREAD_POOL_SIZE);
RetryPolicy retryPolicy = new DefaultRetryPolicy();
File filesDir = getExternalFilesDir("");
Uri downloadUri = Uri.parse(FILE1);
Uri destinationUri = Uri.parse(filesDir+"/test_photo1.JPG");
final DownloadRequest downloadRequest1 = new DownloadRequest(downloadUri)
.setDestinationURI(destinationUri).setPriority(DownloadRequest.Priority.LOW)
.setRetryPolicy(retryPolicy)
.setDownloadContext("Download1")
.setStatusListener(myDownloadStatusListener);
downloadUri = Uri.parse(FILE2);
destinationUri = Uri.parse(filesDir+"/test_photo2.jpg");
final DownloadRequest downloadRequest2 = new DownloadRequest(downloadUri)
.setDestinationURI(destinationUri).setPriority(DownloadRequest.Priority.LOW)
.setDownloadContext("Download2")
.setStatusListener(myDownloadStatusListener);
downloadUri = Uri.parse(FILE3);
destinationUri = Uri.parse(filesDir+"/test_song.mp3");
final DownloadRequest downloadRequest3 = new DownloadRequest(downloadUri)
.setDestinationURI(destinationUri).setPriority(DownloadRequest.Priority.HIGH)
.setDownloadContext("Download3")
.setStatusListener(myDownloadStatusListener);
downloadUri = Uri.parse(FILE4);
destinationUri = Uri.parse(filesDir+"/mani/test/aaa/test_video.mp4");
// Define a custom retry policy
retryPolicy = new DefaultRetryPolicy(5000, 3, 2f);
final DownloadRequest downloadRequest4 = new DownloadRequest(downloadUri)
.setRetryPolicy(retryPolicy)
.setDestinationURI(destinationUri).setPriority(DownloadRequest.Priority.HIGH)
.setDownloadContext("Download4")
.setStatusListener(myDownloadStatusListener);
downloadUri = Uri.parse(FILE5);
destinationUri = Uri.parse(filesDir+"/headers.json");
final DownloadRequest downloadRequest5 = new DownloadRequest(downloadUri)
.addCustomHeader("Auth-Token", "myTokenKey")
.addCustomHeader("User-Agent", "Thin/Android")
.setDestinationURI(destinationUri).setPriority(DownloadRequest.Priority.HIGH)
.setDownloadContext("Download5")
.setStatusListener(myDownloadStatusListener);
downloadUri = Uri.parse(FILE6);
destinationUri = Uri.parse(filesDir+"/wtfappengine.zip");
final DownloadRequest downloadRequest6 = new DownloadRequest(downloadUri)
.setDestinationURI(destinationUri).setPriority(DownloadRequest.Priority.HIGH)
.setDownloadContext("Download6")
.setStatusListener(myDownloadStatusListener);
mDownload1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (downloadManager.query(downloadId1) == DownloadManager.STATUS_NOT_FOUND) {
downloadId1 = downloadManager.add(downloadRequest1);
}
}
});
mDownload2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (downloadManager.query(downloadId2) == DownloadManager.STATUS_NOT_FOUND) {
downloadId2 = downloadManager.add(downloadRequest2);
}
}
});
mDownload3.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (downloadManager.query(downloadId3) == DownloadManager.STATUS_NOT_FOUND) {
downloadId3 = downloadManager.add(downloadRequest3);
}
}
});
mDownload4.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (downloadManager.query(downloadId4) == DownloadManager.STATUS_NOT_FOUND) {
downloadId4 = downloadManager.add(downloadRequest4);
}
}
});
mDownload5.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//if (downloadManager.query(downloadId5) == DownloadManager.STATUS_NOT_FOUND) {
// downloadId5 = downloadManager.add(downloadRequest5);
//}
if (downloadManager.query(downloadId6) == DownloadManager.STATUS_NOT_FOUND) {
downloadId6 = downloadManager.add(downloadRequest6);
}
}
});
mStartAll.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
downloadManager.cancelAll();
downloadId1 = downloadManager.add(downloadRequest1);
downloadId2 = downloadManager.add(downloadRequest2);
downloadId3 = downloadManager.add(downloadRequest3);
downloadId4 = downloadManager.add(downloadRequest4);
downloadId5 = downloadManager.add(downloadRequest5);
}
});
mCancelAll.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
downloadManager.cancelAll();
}
});
mListFiles.setOnClickListener(new View.OnClickListener() {
@Override public void onClick(View v) {
showInternalFilesDir();
}
});
mProgress1Txt.setText("Download1");
mProgress2Txt.setText("Download2");
mProgress3Txt.setText("Download3");
mProgress4Txt.setText("Download4");
mProgress5Txt.setText("Download5");
}
@Override
protected void onDestroy() {
super.onDestroy();
System.out.println("######## onDestroy ######## ");
downloadManager.release();
}
private void showInternalFilesDir() {
File internalFile = new File(getExternalFilesDir("").getPath());
File files[] = internalFile.listFiles();
String contentText = "";
if( files.length == 0 ) {
contentText = "No Files Found";
}
for (File file : files) {
contentText += file.getName()+" "+file.length()+" \n\n ";
}
AlertDialog.Builder builder = new AlertDialog.Builder(this);
AlertDialog internalCacheDialog = builder.create();
LayoutInflater inflater = internalCacheDialog.getLayoutInflater();
View dialogLayout = inflater.inflate(R.layout.layout_files, null);
TextView content = (TextView) dialogLayout.findViewById(R.id.filesList);
content.setText(contentText);
builder.setView(dialogLayout);
builder.show();
}
class MyDownloadDownloadStatusListenerV1 implements DownloadStatusListenerV1 {
@Override
public void onDownloadComplete(DownloadRequest request) {
final int id = request.getDownloadId();
if (id == downloadId1) {
mProgress1Txt.setText(request.getDownloadContext() + " id: "+id+" Completed");
} else if (id == downloadId2) {
mProgress2Txt.setText(request.getDownloadContext() + " id: "+id+" Completed");
} else if (id == downloadId3) {
mProgress3Txt.setText(request.getDownloadContext() + " id: "+id+" Completed");
} else if (id == downloadId4) {
mProgress4Txt.setText(request.getDownloadContext() + " id: "+id+" Completed");
} else if (id == downloadId5) {
mProgress5Txt.setText(request.getDownloadContext() + " id: "+id+" Completed");
}
}
@Override
public void onDownloadFailed(DownloadRequest request, int errorCode, String errorMessage) {
final int id = request.getDownloadId();
if (id == downloadId1) {
mProgress1Txt.setText("Download1 id: "+id+" Failed: ErrorCode "+errorCode+", "+errorMessage);
mProgress1.setProgress(0);
} else if (id == downloadId2) {
mProgress2Txt.setText("Download2 id: "+id+" Failed: ErrorCode "+errorCode+", "+errorMessage);
mProgress2.setProgress(0);
} else if (id == downloadId3) {
mProgress3Txt.setText("Download3 id: "+id+" Failed: ErrorCode "+errorCode+", "+errorMessage);
mProgress3.setProgress(0);
} else if (id == downloadId4) {
mProgress4Txt.setText("Download4 id: "+id+" Failed: ErrorCode "+errorCode+", "+errorMessage);
mProgress4.setProgress(0);
} else if (id == downloadId5) {
mProgress5Txt.setText("Download5 id: "+id+" Failed: ErrorCode "+errorCode+", "+errorMessage);
mProgress5.setProgress(0);
}
}
@Override
public void onProgress(DownloadRequest request, long totalBytes, long downloadedBytes, int progress) {
int id = request.getDownloadId();
System.out.println("######## onProgress ###### "+id+" : "+totalBytes+" : "+downloadedBytes+" : "+progress);
if (id == downloadId1) {
mProgress1Txt.setText("Download1 id: "+id+", "+progress+"%"+" "+getBytesDownloaded(progress,totalBytes));
mProgress1.setProgress(progress);
} else if (id == downloadId2) {
mProgress2Txt.setText("Download2 id: "+id+", "+progress+"%"+" "+getBytesDownloaded(progress,totalBytes));
mProgress2.setProgress(progress);
} else if (id == downloadId3) {
mProgress3Txt.setText("Download3 id: "+id+", "+progress+"%"+" "+getBytesDownloaded(progress,totalBytes));
mProgress3.setProgress(progress);
} else if (id == downloadId4) {
mProgress4Txt.setText("Download4 id: "+id+", "+progress+"%"+" "+getBytesDownloaded(progress,totalBytes));
mProgress4.setProgress(progress);
} else if (id == downloadId5) {
mProgress5Txt.setText("Download5 id: "+id+", "+progress+"%"+" "+getBytesDownloaded(progress,totalBytes));
mProgress5.setProgress(progress);
} else if (id == downloadId6) {
mProgress5Txt.setText("Download6 id: "+id+", "+progress+"%"+" "+getBytesDownloaded(progress,totalBytes));
mProgress5.setProgress(progress);
}
}
}
private String getBytesDownloaded(int progress, long totalBytes) {
//Greater than 1 MB
long bytesCompleted = (progress * totalBytes)/100;
if (totalBytes >= 1000000) {
return (""+(String.format("%.1f", (float)bytesCompleted/1000000))+ "/"+ ( String.format("%.1f", (float)totalBytes/1000000)) + "MB");
} if (totalBytes >= 1000) {
return (""+(String.format("%.1f", (float)bytesCompleted/1000))+ "/"+ ( String.format("%.1f", (float)totalBytes/1000)) + "Kb");
} else {
return ( ""+bytesCompleted+"/"+totalBytes );
}
}
}