BEGIN:VCALL
SLOT:0 //卡槽号 0:单卡手机 1: 双卡手机卡槽1 2: 双卡手机卡槽2
TYPE:1 //电话类型 1:接入电话，2: 呼出电话 3: 未接电话
Date: 2013/02/12 14:11:12 GMT //来电或者去点的时间 备份时以GMT时间记录，恢复时显示手机时区对应时间
NUMBER:+86134xxxxx //对方号码
DURATION:5 //持续时间，秒数
END:VCALL

Uri uri = Uri.parse("context://call_log/calls");
Cursor c = mContext.getContentResolver().query(uri, xxx, xxx );

protected Object doInBackground(Object... params) { //后台异步Task，后台查询数据和写入文件，每导出一条记录，更新一次进度条
super.doInBackground(params);
String path = (String)params[0];

Uri queryUri = Uri.parse("content://call_log/calls");
Cursor queryedCursor = mContext.getContentResolver().query(queryUri,
null,
null,
null,
null);
if (queryedCursor == null || queryedCursor.getCount() == 0){
return -1;
}

Object[] message = new Object[1];
message[0] = queryedCursor.getCount();
publishProgress(message);

StringBuilder sb = new StringBuilder();
OutputStream outputStream = null;
Writer writer = null;
try {
outputStream = new FileOutputStream(path);
writer = new BufferedWriter(new OutputStreamWriter(outputStream));

for (queryedCursor.moveToFirst(); !queryedCursor.isAfterLast();
queryedCursor.moveToNext()) {
if (mCancel){
break;
}
sb.setLength(0);
sb.append("BEGIN:VCALL").append("n");
int subId = queryedCursor.getInt(queryedCursor.getColumnIndex("sub_id"));
int callType = queryedCursor.getInt(
queryedCursor.getColumnIndex("type")); //incall/outcall/missed call
long date = queryedCursor.getLong(queryedCursor.getColumnIndex("date"));
String gmtData = getGTMDatetimeString(date);
String number = queryedCursor.getString(queryedCursor.getColumnIndex("formatted_number"));
String duration = queryedCursor.getString(queryedCursor.getColumnIndex("duration"));

sb.append("SLOT:").append(subId).append("n");
sb.append("TYPE:").append(callType).append("n");
sb.append("DATE:").append(gmtData).append("n");
sb.append("NUMBER:").append(number).append("n");
sb.append("DURATION:").append(duration).append("n");
sb.append("END:VCALL").append("n");
writer.write(sb.toString()); //写入一条记录到文件中
message[0] = -1;
publishProgress(message); //发布消息，让主线程更新进度条
}

} catch (Exception e) {
Log.d(TAG, "", e);
return 0;
}finally{
try {
if (writer != null){
writer.close();
}
if (outputStream != null){
outputStream.close();
}
} catch (Exception e2) {
Log.d(TAG, "", e2);
return 0;
}
}
return 1;
}

private class VCLScanThread extends Thread implements OnCancelListener, OnClickListener { //启动线程进行搜索，同时弹出进度条给用户
private boolean mCanceled; //变量标志用户是否已经cancel这个搜索过程
private boolean mGotIOException;
private File mRootDirectory;
private static final String LOG_TAG = "VCLScanThread";

// To avoid recursive link.
private Set mCheckedPaths;

private class CanceledException extends Exception {
}

public VCLScanThread(File sdcardDirectory, String scanType) {
mCanceled = false;
mGotIOException = false;
mRootDirectory = sdcardDirectory;
mCheckedPaths = new HashSet();
mProgressDialogForScanVCard = new ProgressDialog(Main.this);
mProgressDialogForScanVCard.setTitle(R.string.dialog_scan_calllist_progress_title);
mProgressDialogForScanVCard.show(); //弹出搜索进度条
}

@Override
public void run() {
if (mAllVclFileList == null){
mAllVclFileList = new Vector(); //开始搜索，首先清空list，这个list用来保存找到的.vcl文件(包括文件名，文件路径，等等)
}else{
mAllVclFileList.clear();
}

try {
getVCardFileRecursively(mRootDirectory); //迭代搜索sd卡中所有的.vcl文件
} catch (CanceledException e) {
mCanceled = true;
} catch (IOException e) {
mGotIOException = true;
}

if (mCanceled) {
mAllVclFileList = null;
}

mProgressDialogForScanVCard.dismiss();
mProgressDialogForScanVCard = null;

if (mGotIOException) {
// runOnUiThread(new DialogDisplayer(R.id.dialog_io_exception));
} else if (mCanceled) {
// finish();
} else {
int size = mAllVclFileList.size();
if (size == 0) {
Toast.makeText(Main.this, R.string.error_scan_vcl_not_found,
Toast.LENGTH_SHORT).show();
} else {
runOnUiThread(new Runnable() {
@Override
public void run() {
startVCardSelectAndImport(); //搜索完毕，弹出对话框让用户选择导入那些文件
}
});

}
}
}

private void getVCardFileRecursively(File directory)
throws CanceledException, IOException {
if (mCanceled) {
throw new CanceledException();
}

// e.g. secured directory may return null toward listFiles().
final File[] files = directory.listFiles();
if (files == null) {
final String currentDirectoryPath = directory.getCanonicalPath();
final String secureDirectoryPath =
mRootDirectory.getCanonicalPath().concat(SECURE_DIRECTORY_NAME);
if (!TextUtils.equals(currentDirectoryPath, secureDirectoryPath)) {
Log.w(LOG_TAG, "listFiles() returned null (directory: " + directory + ")");
}
return;
}
for (File file : directory.listFiles()) {
if (mCanceled) {
throw new CanceledException();
}
String canonicalPath = file.getCanonicalPath();
if (mCheckedPaths.contains(canonicalPath)) {
continue;
}

mCheckedPaths.add(canonicalPath);

String endFix = ".vcl";
if (file.isDirectory()) {
getVCardFileRecursively(file); //如果是目录，就继续迭代搜索
} else if (canonicalPath.toLowerCase().endsWith(endFix) && //如果是文件，就判断文件名是否以.vcl结尾，如果是，而且可读，则放入搜索的list里面。
file.canRead()){
String fileName = file.getName();
VCLFile vclFile = new VCLFile(
fileName, canonicalPath, file.lastModified());
mAllVclFileList.add(vclFile);

}
}
}

public void onCancel(DialogInterface dialog) {
mCanceled = true;
}

public void onClick(DialogInterface dialog, int which) {
if (which == DialogInterface.BUTTON_NEGATIVE) {
mCanceled = true;
}
}
}

private void parseItemInter(String name, String value) throws Exception{
if ("SLOT".equalsIgnoreCase(name)){
mValues.put("sub_id", value);
}else if ("TYPE".equalsIgnoreCase(name)){
mValues.put("type", value);
}else if ("DATE".equalsIgnoreCase(name)){
mValues.put("date", getGTMDatetime(value));
}else if ("NUMBER".equalsIgnoreCase(name)){
mValues.put("formatted_number", value);
mValues.put("number", value);
}else if ("DURATION".equalsIgnoreCase(name)){
mValues.put("duration", value);
}else{
throw new Exception("Unknown type, name: " + name + " value: " + value);
}
}

//提交一次通话记录信息到数据库
Uri uri = Uri.parse("content://call_log");
mContext.getContentResolver().insert(uri, mValues);