我正在尝试更新progress bar将文件解压缩到 SD 卡中。我的解压工作正常，但是progress bar没有出现。这是我在 mainactivity 中的代码：
private ProgressBar bar;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
bar = (ProgressBar) findViewById(R.id.progress);
String zipFilename = Environment.getExternalStorageDirectory() + "path to my zip file in sd card";
String unzipLocation = Environment.getExternalStorageDirectory() + "the output folder";
Decompress d = new Decompress(zipFilename, unzipLocation);
d.unzip();
}
public class Decompress {
private String _zipFile;
private String _location;
private int per = 0;
public Decompress(String zipFile, String location) {
_zipFile = zipFile;
_location = location;
_dirChecker("");
}
public void unzip() {
try {
ZipFile zip = new ZipFile(_zipFile);
bar.setMax(zip.size());
FileInputStream fin = new FileInputStream(_zipFile);
ZipInputStream zin = new ZipInputStream(fin);
ZipEntry ze = null;
while ((ze = zin.getNextEntry()) != null) {
Log.v("Decompress", "Unzipping " + ze.getName());
if(ze.isDirectory()) {
_dirChecker(ze.getName());
} else {
// Here I am doing the update of my progress bar
per++;
bar.setProgress(per);
FileOutputStream fout = new FileOutputStream(_location + ze.getName());
for (int c = zin.read(); c != -1; c = zin.read()) {
fout.write(c);
}
zin.closeEntry();
fout.close();
}
}
zin.close();
} catch(Exception e) {
Log.e("Decompress", "unzip", e);
}
}
private void _dirChecker(String dir) {
File f = new File(_location + dir);
if(!f.isDirectory()) {
f.mkdirs();
}
}
}
}
您的解压缩代码在主/UI 线程上运行，从而冻结了 UI。您想使用在后台线程中进行解压缩AsyncTask.
您的案例示例：
private class Decompress extends AsyncTask<Void, Integer, Integer> {
private String _zipFile;
private String _location;
private int per = 0;
public Decompress(String zipFile, String location) {
_zipFile = zipFile;
_location = location;
_dirChecker("");
}
@Override
protected Integer doInBackground() {
try {
ZipFile zip = new ZipFile(_zipFile);
bar.setMax(zip.size());
FileInputStream fin = new FileInputStream(_zipFile);
ZipInputStream zin = new ZipInputStream(fin);
ZipEntry ze = null;
while ((ze = zin.getNextEntry()) != null) {
Log.v("Decompress", "Unzipping " + ze.getName());
if (ze.isDirectory()) {
_dirChecker(ze.getName());
} else {
// Here I am doing the update of my progress bar
per++;
publishProgress(per);
FileOutputStream fout = new FileOutputStream(_location + ze.getName());
for (int c = zin.read(); c != -1; c = zin.read()) {
fout.write(c);
}
zin.closeEntry();
fout.close();
}
}
zin.close();
} catch (Exception e) {
Log.e("Decompress", "unzip", e);
}
return totalSize;
}
@Override
protected void onProgressUpdate(Integer... progress) {
bar.setProgress(per); //Since it's an inner class, Bar should be able to be called directly
}
@Override
protected void onPostExecute(Integer... result) {
Log.i("Completed. Total size: " + result);
}
}
本文内容由网友自发贡献，版权归原作者所有，本站不承担相应法律责任。如您发现有涉嫌抄袭侵权的内容，请联系:hwhale#tublm.com(使用前将#替换为@)
