Here i modified the WipeSDActivity.java class.Please check and let me know.Hope it should helpful for you. Thanks.
import java.io.File;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class WipeSDActivity extends Activity {
private static ProgressDialog progressBar;
private static int progressBarStatus = 0;
private static Handler progressBarHandler = new Handler();
public Button btnwipe_sd;
private int fileCount = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.sd_card);
btnwipe_sd = (Button)findViewById(R.id.wipe_button);
btnwipe_sd.setOnClickListener(new OnClickListener()
{
public void onClick(final View view)
{
new AlertDialog.Builder(WipeSDActivity.this).setCancelable(true)
.setMessage("This will attempt to wipe all directories and files on your SD card.")
.setPositiveButton("WIPE", new DialogInterface.OnClickListener()
{
public void onClick(DialogInterface dialog, int which)
{
dialog.dismiss();
FormatSDCard(view);
}
}).setNegativeButton("NO!", new DialogInterface.OnClickListener()
{
public void onClick(DialogInterface dialog, int which)
{
dialog.dismiss();
}
}).show();
}
});
}
public void FormatSDCard(View v){
progressBar = new ProgressDialog(v.getContext());
progressBar.setCancelable(false);
progressBar.setMessage("File deleting ...");
progressBar.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
progressBar.setProgress(0);
progressBar.setMax(100);
progressBar.show();
new Thread(new Runnable() {
public void run() {
while (progressBarStatus < 100) {
//fileCount = 0;
// process some tasks
progressBarStatus = wipingSdcard();
// your computer is too fast, sleep 1 second
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
// Update the progress bar
progressBarHandler.post(new Runnable() {
public void run() {
progressBar.setProgress(progressBarStatus);
}
});
}
// ok, file is deleted,
if (progressBarStatus >= 100) {
// sleep 2 seconds, so that you can see the 100%
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
e.printStackTrace();
}
// close the progress bar dialog
progressBar.dismiss();
}
}
}).start();
}
public int wipingSdcard() {
File deleteMatchingFile = new File(Environment
.getExternalStorageDirectory().toString());
try {
File[] filenames = deleteMatchingFile.listFiles();
if (filenames != null && filenames.length > 0) {
for (File tempFile : filenames) {
if (tempFile.isDirectory()) {
wipeDirectory(tempFile.toString());
tempFile.delete();
} else {
tempFile.delete();
}
fileCount++;
progressBarStatus = fileCount;
progressBarHandler.post(new Runnable() {
public void run() {
progressBar.setProgress(progressBarStatus);
}
});
}
} else {
deleteMatchingFile.delete();
}
} catch (Exception e) {
e.printStackTrace();
}
return fileCount;
}
private void wipeDirectory(String name) {
File directoryFile = new File(name);
File[] filenames = directoryFile.listFiles();
if (filenames != null && filenames.length > 0) {
for (File tempFile : filenames) {
if (tempFile.isDirectory()) {
wipeDirectory(tempFile.toString());
tempFile.delete();
} else {
tempFile.delete();
}
}
} else {
directoryFile.delete();
}
}
}
Also you have to give permission if you are using >1.6 SDK
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
in AndroidManifest.xml file