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我用下面的代碼創建我的應用程序文件夾結構的備份(備份到遠程USB)添加進度條到備份
它工作正常,但現在我試圖找出如何說明當前的百分比是如何變化的。實際上,我想我不明白副本的工作方式是否足以列出文件夾中有多少文件來計算出百分比?或者增加什麼。
任何提示真的將不勝感激。
這裏是我的備用碼:
public void doBackup(View view) throws IOException{
Time today = new Time(Time.getCurrentTimezone());
today.setToNow();
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd_HHmmss");
final String curDate = sdf.format(new Date());
final ProgressDialog pd = new ProgressDialog(this);
pd.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
pd.setMessage("Running backup. Do not unplug drive");
pd.setIndeterminate(true);
pd.setCancelable(false);
pd.show();
Thread mThread = new Thread() {
@Override
public void run() {
File source = new File(Global.SDcard);
File dest = new File(Global.BackupDir + curDate);
try {
copyDirectory(source, dest);
} catch (IOException e) {
e.printStackTrace();
}
pd.dismiss();
}
};
mThread.start();
}
public void copyDirectory(File sourceLocation , File targetLocation)
throws IOException {
Log.e("Backup", "Starting backup");
if (sourceLocation.isDirectory()) {
if (!targetLocation.exists() && !targetLocation.mkdirs()) {
throw new IOException("Cannot create dir " + targetLocation.getAbsolutePath());
}
String[] children = sourceLocation.list();
for (int i=0; i<children.length; i++) {
copyDirectory(new File(sourceLocation, children[i]),
new File(targetLocation, children[i]));
}
} else {
Log.e("Backup", "Creating backup directory");
File directory = targetLocation.getParentFile();
if (directory != null && !directory.exists() && !directory.mkdirs()) {
throw new IOException("Cannot create dir " + directory.getAbsolutePath());
}
InputStream in = new FileInputStream(sourceLocation);
OutputStream out = new FileOutputStream(targetLocation);
byte[] buf = new byte[1024];
int len;
while ((len = in.read(buf)) > 0) {
out.write(buf, 0, len);
}
in.close();
out.close();
Log.e("Backup", "Finished");
}
}
非常感謝這一點。我很抱歉,如果我是一個白癡,但我不知道在哪裏增加進度欄? – TMB87
編輯答案。 – Mike