如何在Android中的.csv文件中逐行编写contactname和contactno？
作者：互联网
我想从移动设备上获取联系人名称和相应的联系人号码,并希望将其写入.csv文件.每行将包含整个联系人列表的每个人的联系人姓名和联系电话.如何在.csv文件中写联系信息？
我编写了用于显示contactname列的代码,但它只显示一个联系人意味着它覆盖了现有的联系人,因此更改新联系人姓名行的技巧应该是什么.
我的代码
public class contactlist extends Activity {
static String name;
static int count;
static int countno;
static File file = null ;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button filterbtn = (Button)findViewById(R.id.button1);
filterbtn.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v)
{
Uri u1 = Uri.fromFile(file);
Intent sendIntent = new Intent(Intent.ACTION_SEND);
sendIntent.putExtra(Intent.EXTRA_SUBJECT, "Person Details");
sendIntent.putExtra(Intent.EXTRA_STREAM, u1);
sendIntent.setType("text/html");
startActivity(sendIntent);
}
});
ContentResolver cr = getContentResolver();
Cursor cur = cr.query(ContactsContract.Contacts.CONTENT_URI,
null, null, null, null);
if (cur.getCount() > 0) {
while (cur.moveToNext()) {
String id = cur.getString(
cur.getColumnIndex(ContactsContract.Contacts._ID));
name = cur.getString(
cur.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));
String columnString = "\"PersonName\",\"phoneno\"";
String dataString = null;
我只使用名称而“phoneno”是硬编码的.但在.csv文件中只显示一个联系人
dataString = "\"" + name +"\",\"" + "phoneno" + "\"";
String combinedString = columnString + "\n" + dataString;
File root = Environment.getExternalStorageDirectory();
if (root.canWrite()){
File dir = new File (root.getAbsolutePath() + "/PersonData");
dir.mkdirs();
file = new File(dir, "Data.csv");
FileOutputStream out = null;
try {
out = new FileOutputStream(file);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
try {
out.write(combinedString.getBytes());
} catch (IOException e) {
e.printStackTrace();
}
try {
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
cur.close();
}
解决方法:
编辑.
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.ContactsContract;
import android.provider.ContactsContract.CommonDataKinds.Phone;
import android.util.Log;
import android.widget.Toast;
/**
* @author Pankaj
*
*/
public class CsvSender extends Activity {
private Cursor cursor;
private boolean csv_status = false;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
createCSV();
exportCSV();
}
private void createCSV() {
CSVWriter writer = null;
try {
writer = new CSVWriter(new FileWriter(Environment.getExternalStorageDirectory().getAbsolutePath() + "/my_test_contact.csv"));
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
String displayName;
String number;
long _id;
String columns[] = new String[]{ ContactsContract.Contacts._ID,
ContactsContract.Contacts.DISPLAY_NAME };
writer.writeColumnNames(); // Write column header
Cursor cursor = getContentResolver().query(ContactsContract.Contacts.CONTENT_URI,
columns,
null,
null,
ContactsContract.Data.DISPLAY_NAME + " COLLATE LOCALIZED ASC");
startManagingCursor(cursor);
if(cursor.moveToFirst()) {
do {
_id = Long.parseLong(cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts._ID)));
displayName = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME)).trim();
number = getPrimaryNumber(_id);
writer.writeNext((displayName + "/" + number).split("/"));
} while(cursor.moveToNext());
csv_status = true;
} else {
csv_status = false;
}
try {
if(writer != null)
writer.close();
} catch (IOException e) {
Log.w("Test", e.toString());
}
}// Method close.
private void exportCSV() {
if(csv_status == true) {
//CSV file is created so we need to Export that ...
final File CSVFile = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "/my_test_contact.csv");
//Log.i("SEND EMAIL TESTING", "Email sending");
Intent emailIntent = new Intent(android.content.Intent.ACTION_SEND);
emailIntent.setType("text/csv");
emailIntent .putExtra(android.content.Intent.EXTRA_SUBJECT, "Test contacts ");
emailIntent .putExtra(android.content.Intent.EXTRA_TEXT, "\n\nAdroid developer\n Pankaj");
emailIntent.putExtra(Intent.EXTRA_STREAM, Uri.parse("file://" + CSVFile.getAbsolutePath()));
emailIntent.setType("message/rfc822"); // Shows all application that supports SEND activity
try {
startActivity(Intent.createChooser(emailIntent, "Send mail..."));
} catch (android.content.ActivityNotFoundException ex) {
Toast.makeText(getApplicationContext(), "Email client : " + ex.toString(), Toast.LENGTH_SHORT);
}
} else {
Toast.makeText(getApplicationContext(), "Information not available to create CSV.", Toast.LENGTH_SHORT).show();
}
}
/**
* Get primary Number of requested id.
*
* @return string value of primary number.
*/
private String getPrimaryNumber(long _id) {
String primaryNumber = null;
try {
Cursor cursor = getContentResolver().query( ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
new String[]{Phone.NUMBER, Phone.TYPE},
ContactsContract.CommonDataKinds.Phone.CONTACT_ID +" = "+ _id, // We need to add more selection for phone type
null,
null);
if(cursor != null) {
while(cursor.moveToNext()){
switch(cursor.getInt(cursor.getColumnIndex(Phone.TYPE))){
case Phone.TYPE_MOBILE :
primaryNumber = cursor.getString(cursor.getColumnIndex(Phone.NUMBER));
break;
case Phone.TYPE_HOME :
primaryNumber = cursor.getString(cursor.getColumnIndex(Phone.NUMBER));
break;
case Phone.TYPE_WORK :
primaryNumber = cursor.getString(cursor.getColumnIndex(Phone.NUMBER));
break;
case Phone.TYPE_OTHER :
}
if(primaryNumber != null)
break;
}
}
} catch (Exception e) {
Log.i("test", "Exception " + e.toString());
} finally {
if(cursor != null) {
cursor.deactivate();
cursor.close();
}
}
return primaryNumber;
}
}
这是CSVWriter类
import java.io.IOException;
import java.io.PrintWriter;
import java.io.Writer;
/**
* @author Pankaj
*
*/
public class CSVWriter {
private PrintWriter pw;
private char separator;
private char quotechar;
private char escapechar;
private String lineEnd;
/** The character used for escaping quotes. */
public static final char DEFAULT_ESCAPE_CHARACTER = '"';
/** The default separator to use if none is supplied to the constructor. */
public static final char DEFAULT_SEPARATOR = ',';
/**
* The default quote character to use if none is supplied to the
* constructor.
*/
public static final char DEFAULT_QUOTE_CHARACTER = '"';
/** The quote constant to use when you wish to suppress all quoting. */
public static final char NO_QUOTE_CHARACTER = '\u0000';
/** The escape constant to use when you wish to suppress all escaping. */
public static final char NO_ESCAPE_CHARACTER = '\u0000';
/** Default line terminator uses platform encoding. */
public static final String DEFAULT_LINE_END = "\n";
/** Default column name. */
public static final String DEFAULT_COLUMN_NAME = "Contact Name,Phone Number,";
/**
* Constructs CSVWriter using a comma for the separator.
*
* @param writer
* the writer to an underlying CSV source.
*/
public CSVWriter(Writer writer) {
this(writer, DEFAULT_SEPARATOR, DEFAULT_QUOTE_CHARACTER,
DEFAULT_ESCAPE_CHARACTER, DEFAULT_LINE_END);
}
/**
* Constructs CSVWriter with supplied separator, quote char, escape char and line ending.
*
* @param writer
* the writer to an underlying CSV source.
* @param separator
* the delimiter to use for separating entries
* @param quotechar
* the character to use for quoted elements
* @param escapechar
* the character to use for escaping quotechars or escapechars
* @param lineEnd
* the line feed terminator to use
*/
public CSVWriter(Writer writer, char separator, char quotechar, char escapechar, String lineEnd) {
this.pw = new PrintWriter(writer);
this.separator = separator;
this.quotechar = quotechar;
this.escapechar = escapechar;
this.lineEnd = lineEnd;
}
/**
* Writes the next line to the file.
*
* @param nextLine
* a string array with each comma-separated element as a separate
* entry.
*/
public void writeNext(String[] nextLine) {
if (nextLine == null)
return;
StringBuffer sb = new StringBuffer();
for (int i = 0; i < nextLine.length; i++) {
if (i != 0) {
sb.append(separator);
}
String nextElement = nextLine[i];
if (nextElement == null)
continue;
if (quotechar != NO_QUOTE_CHARACTER)
sb.append(quotechar);
for (int j = 0; j < nextElement.length(); j++) {
char nextChar = nextElement.charAt(j);
if (escapechar != NO_ESCAPE_CHARACTER && nextChar == quotechar) {
sb.append(escapechar).append(nextChar);
} else if (escapechar != NO_ESCAPE_CHARACTER && nextChar == escapechar) {
sb.append(escapechar).append(nextChar);
} else {
sb.append(nextChar);
}
}
if (quotechar != NO_QUOTE_CHARACTER)
sb.append(quotechar);
}
sb.append(lineEnd);
pw.write(sb.toString());
}
public void writeColumnNames() {
writeNext(DEFAULT_COLUMN_NAME.split(","));
}
/**
* Flush underlying stream to writer.
*
* @throws IOException if bad things happen
*/
public void flush() throws IOException {
pw.flush();
}
/**
* Close the underlying stream writer flushing any buffered content.
*
* @throws IOException if bad things happen
*
*/
public void close() throws IOException {
pw.flush();
pw.close();
}
}
并将清单的权限添加为
<uses-permission android:name="android.permission.READ_CONTACTS" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
标签：android,android-contacts 来源： https://codeday.me/bug/20191008/1873862.html