抱歉，我不知道问题的标题应该是什么。谁能告诉我这怎么可能？
绿线尚未执行。
编辑：在这里，tmp和size肯定是正整数。
编辑：源代码：
public class MyDownloadService extends IntentService {
String urlD, name, sole, urlOfImage = "";
Context conte;
static int q = -1;
int progress = 0, nin, tmp = 0;
File file;
public static final String NOTIFICATION = "com.example.downloader2.ShowDownloadsActivity";
public static final String NOTIFICATION2 = "com.example.downloader2.ShowDownloadsActivity2";
AppGlobal apg;
public MyDownloadService(String name) {
super("Downloading");
}
public MyDownloadService() {
super("Downloading");
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
q = q + 1;
return super.onStartCommand(intent, flags, startId);
}
@Override
public void onCreate() {
super.onCreate();
conte = this;
}
@Override
protected void onHandleIntent(Intent intent) {
apg = (AppGlobal) getApplication();
urlD = intent.getExtras().getString("url");
name = intent.getExtras().getString("name");
nin = intent.getExtras().getInt("nin");
urlOfImage = intent.getExtras().getString("urlOfImage");
int ret = intent.getExtras().getInt("retry");
if (ret == 1) {
Toast.makeText(conte,
"Please wait... Your download will start soon",
Toast.LENGTH_SHORT).show();
}
sole = name;
try {
int size = 0;
final int TIMEOUT_CONNECTION = 15000;// 15sec
final int TIMEOUT_SOCKET = 30000;// 30sec
String imageURL = urlD;
URL url = new URL(imageURL);
long startTime = System.currentTimeMillis();
Log.e("Note: ", "image download beginning: " + imageURL);
// Open a connection to that URL.
URLConnection ucon = url.openConnection();
// this timeout affects how long it takes for the app to realize
// there's a connection problem
ucon.setReadTimeout(TIMEOUT_CONNECTION);
ucon.setConnectTimeout(TIMEOUT_SOCKET);
// Define InputStreams to read from the URLConnection.
// uses 3KB download buffer
InputStream is = ucon.getInputStream();
size = ucon.getContentLength();
BufferedInputStream inStream = new BufferedInputStream(is, 1024 * 5);
File wallpaperDirectory = new File(
Environment.getExternalStorageDirectory() + "/myFold");
wallpaperDirectory.mkdirs();
// sole = sole.replace("?", "_");
// sole = sole.replace("|", "_");
// sole = sole.replace("/", "_");
// sole = sole.replace(":", "_");
// sole = sole.replace("$", "_");
file = new File(wallpaperDirectory + File.separator + sole);
if (file.exists()) {
file.delete();
}
file.createNewFile();
apg.setInDownload(true);
FileOutputStream outStream = new FileOutputStream(file);
byte[] buff = new byte[5 * 1024];
// Read bytes (and store them) until there is nothing more to
// read(-1)
int len;
tmp = 0;
while ((len = inStream.read(buff)) != -1) {
if (apg.getCont()) {
apg.setCont(false);
stopSelf();
Intent inten = new Intent();
inten.putExtra("urlToDownload", urlD);
inten.putExtra("timeout", 7);
inten.putExtra("name", sole);
inten.putExtra("progress", progress);
inten.putExtra("nin", nin);
inten.putExtra("url", urlD);
inten.setAction("com.example.downloader2.BR");
sendBroadcast(inten);
Intent in2 = new Intent(NOTIFICATION);
in2.putExtra("progress", progress);
in2.putExtra("running", 0);
in2.putExtra("name", sole);
q--;
sendBroadcast(in2);
progress = 0;
if (file.exists()) {
file.delete();
}
outStream.close();
return;
}
tmp = tmp + len;
progress = (tmp * 100) / size;
if(progress<0)
progress=-1*progress;
outStream.write(buff, 0, len);
publishP();
}
tmp = size;
progress = 101;
publishP();
// clean up
outStream.flush();
outStream.close();
inStream.close();
Log.e("Note: ",
"Download completed in "
+ ((System.currentTimeMillis() - startTime) / 1000)
+ " secs.");
} catch (Exception e) {
if (file.exists()) {
file.delete();
}
apg.setInDownload(false);
Intent inten = new Intent();
inten.putExtra("urlToDownload", urlD);
if (e.toString()
.equals("java.io.IOException: open failed: EACCES (Permission denied)")) {
inten.putExtra("timeout", 5);
} else {
inten.putExtra("timeout", 1);
}
inten.putExtra("name", sole);
inten.putExtra("progress", progress);
inten.putExtra("nin", nin);
inten.putExtra("url", urlD);
inten.setAction("com.example.downloader2.BR");
sendBroadcast(inten);
Intent in2 = new Intent(NOTIFICATION);
in2.putExtra("progress", progress);
in2.putExtra("running", 0);
in2.putExtra("name", sole);
q--;
sendBroadcast(in2);
progress = 0;
Log.e("Error: ", "Error is:" + e.toString());
}
}
protected void publishP() {
try {
Intent intent = new Intent();
intent.putExtra("timeout", 0);
intent.putExtra("progress", progress);
intent.putExtra("nin", nin);
intent.putExtra("name", sole);
intent.setAction("com.example.downloader2.BR");
sendBroadcast(intent);
Intent in2 = new Intent(NOTIFICATION);
if (progress > 100)
q--;
in2.putExtra("progress", progress);
in2.putExtra("running", 1);
in2.putExtra("name", sole);
in2.putExtra("queue", q);
sendBroadcast(in2);
} catch (Exception e) {
Log.e("Shit", e.toString());
}
}
@Override
public boolean stopService(Intent name) {
return super.stopService(name);
}
}
编辑：这3个快照是我在相同调试器状态下拍摄的：
最佳答案
这称为溢出。如果数字太大，则无法正确表示，然后变为负数。在术语“溢出”中搜索详细信息。
您可以尝试使用(float)tmp / size * 100，其基本原理是确保计算期间数字不超过100。
请注意，必须进行浮点转换，因为整数除法将始终为您提供整数。在您的情况下，如果不进行强制转换，则总会得到0。
关于android - 正值变为负值，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/19947249/