我需要在 Android 中使用 SQLite。那么，我是否必须下载任何 SQLite 管理（如 MySql）或者它已经在设备内存中？
问问题
157 次
4 回答
1
你不需要下载任何东西。它已经在那里了。
于 2013-01-11T12:24:06.180 回答
1
除了使用 Android SDK 中的内置工具外，您无需执行任何操作。有关更多信息，请查看sqlite 文档
基本上，您可以使用 Java 代码创建数据库、向其中插入记录、修改它们等。
如果您想以图形方式处理数据库，只需使用 Eclipse 的 DDMS 视图导航到应用程序的数据库文件夹。从那里，将数据库下载到您的计算机上，然后使用许多可用的 sqlite 应用程序之一打开它。
于 2013-01-11T12:24:22.590 回答
1
您需要的一切都已经安装好了。要在开发期间检查数据库，您可以使用 sqlite3 工具。它安装在模拟器中。
于 2013-01-11T12:24:47.517 回答
0
------------------------------------------------------------------------
Sqlite
----------------------------------------------------------------------
// instance varieable
Button btn_insert,btn_update,btn_show,btn_delete,btn_search;
EditText edit_no,edit_name,edit_mark;
Cursor c;
Context context=this;
SQLiteDatabase db;
StringBuffer sb;
init
edit_no= (EditText) findViewById(R.id.edit_no);
edit_name= (EditText) findViewById(R.id.edit_name);
edit_mark= (EditText) findViewById(R.id.edit_mark);
btn_insert= (Button) findViewById(R.id.btn_insert);
btn_update= (Button) findViewById(R.id.btn_update);
btn_show= (Button) findViewById(R.id.btn_show);
btn_delete= (Button) findViewById(R.id.btn_delete);
btn_search= (Button) findViewById(R.id.btn_search);
db=openOrCreateDatabase("topstech",context.MODE_PRIVATE,null);
db.execSQL("create table if not exists register(no varchar2(20),name varchar2(20),mark varchar2(20))");
btn_insert.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (edit_no.getText().toString().trim().length() == 0) {
edit_no.setError("Enter Your No");
return;
} else if (edit_name.getText().toString().trim().length() == 0) {
edit_name.setError("Enter Your Name");
return;
} else if (edit_mark.getText().toString().trim().length() == 0) {
edit_mark.setError("Enter Your Mark");
return;
} else {
db.execSQL("insert into register values('" + edit_no.getText().toString() + "','" + edit_name.getText().toString() + "','" + edit_mark.getText().toString() + "')");
Toast.makeText(context, "Record Successfully Inserted...", Toast.LENGTH_SHORT).show();
Clear();
}
}
});
btn_show.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v)
{
c=db.rawQuery("select * from register",null);
sb=new StringBuffer();
if(c.moveToFirst())
{
do
{
sb.append(c.getString(c.getColumnIndex("no"))+"\t");
sb.append(c.getString(c.getColumnIndex("name"))+"\t");
sb.append(c.getString(c.getColumnIndex("mark"))+"\n");
}while (c.moveToNext());
Toast.makeText(MainActivity.this, ""+sb, Toast.LENGTH_SHORT).show();
}
else
{
Toast.makeText(MainActivity.this, "Empty Record...", Toast.LENGTH_SHORT).show();
}
}
});
btn_delete.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v)
{
if (edit_no.getText().toString().trim().length() == 0)
{
edit_no.setError("Enter Your No");
return;
}
else
{
c=db.rawQuery("select * from register where no='"+edit_no.getText().toString()+"'",null);
sb=new StringBuffer();
if(c.moveToFirst())
{
do
{
db.execSQL("delete from register where no='"+edit_no.getText().toString()+"'");
Toast.makeText(MainActivity.this, "1 Record Is Deleted...", Toast.LENGTH_SHORT).show();
Clear();
}while (c.moveToNext());
}
else
{
Toast.makeText(MainActivity.this, "Record Not Found...", Toast.LENGTH_SHORT).show();
Clear();
}
}
}
});
btn_search.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
if (edit_no.getText().toString().trim().length() == 0)
{
edit_no.setError("Enter Your No");
return;
}
else
{
c=db.rawQuery("select * from register where no='"+edit_no.getText().toString()+"'",null);
sb=new StringBuffer();
if(c.moveToFirst())
{
do
{
edit_name.setText(c.getString(c.getColumnIndex("name")));
edit_mark.setText(c.getString(c.getColumnIndex("mark")));
}while (c.moveToNext());
}
else
{
Toast.makeText(MainActivity.this, "Record Not Found...", Toast.LENGTH_SHORT).show();
Clear();
}
}
}
});
btn_update.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v)
{
if (edit_no.getText().toString().trim().length() == 0)
{
edit_no.setError("Enter Your No");
return;
}
else
{
c=db.rawQuery("select * from register where no='"+edit_no.getText().toString()+"'",null);
sb=new StringBuffer();
if(c.moveToFirst())
{
do
{
if (edit_name.getText().toString().trim().length() == 0)
{
edit_name.setError("Enter Your Name");
return;
}
else if (edit_mark.getText().toString().trim().length() == 0)
{
edit_mark.setError("Enter Your Mark");
return;
}
else
{
//Syntex:-
// db.execSQL("update tablename set col_name='" +edit_name+"' where no='" + no+ "'");
db.execSQL("update register set name='"+edit_name.getText().toString()+"',mark='"+edit_mark.getText().toString()+"' where no='"+edit_no.getText().toString()+"'");
Toast.makeText(MainActivity.this, "1 Record Is Updated...", Toast.LENGTH_SHORT).show();
Clear();
}
}while (c.moveToNext());
}
else
{
Toast.makeText(MainActivity.this, "Record Not Found...", Toast.LENGTH_SHORT).show();
Clear();
}
}
}
});
}
-----------------------------------------
Upload Image ANd Fetch Device Contact JSON ARRAY
------------------------------------------
Upload Image Using Retrofit
@Multipart
@POST("addDocument")
Call<AddDocumentsResponse> doAddDocuments(@Header("Authorization") String token, @Part List<MultipartBody.Part> files, @PartMap Map<String, RequestBody> map);
private void uploadDocuments() {
if (Utility.checkInternetConnection(InsurenceActivity.this)) {
ArrayList<MultipartBody.Part> multipart = new ArrayList<>();
Map<String, RequestBody> map = new HashMap<>();
map.put("document_type", RequestBody.create(MediaType.parse("text/plain"), "insurance"));
map.put("expiry_date", RequestBody.create(MediaType.parse("text/plain"), str_select_date));
map.put("photo_id_type", RequestBody.create(MediaType.parse("text/plain"), ""));
multipart.add(Utility.prepareFilePart(InsurenceActivity.this, "document_file", picturePath));
messageUtil.showProgressDialog(InsurenceActivity.this);
Call<AddDocumentsResponse> registerResponseCall = ApiClient.getApiInterface().doAddDocuments(fastSave.getString(Constant.ACCESS_TOKEN), multipart, map);
Log.d("request","---- Request -----"+map.toString());
registerResponseCall.enqueue(new Callback<AddDocumentsResponse>() {
@Override
public void onResponse(Call<AddDocumentsResponse> call, Response<AddDocumentsResponse> response) {
if (response.code() == 200) {
if (response.body().getStatus().equalsIgnoreCase("fail"))
{
messageUtil.hideProgressDialog();
messageUtil.showErrorToast(response.body().getMessage());
return;
}
if (response.body().getStatus().equalsIgnoreCase("success"))
{
Log.d("response","---- Respons -----"+new Gson().toJson(response));
messageUtil.hideProgressDialog();
messageUtil.showSuccessToast(response.body().getMessage());
str_select_date = str_select_date;
picturePath = null;
Log.d("TAG", "success:............... " + new Gson().toJson(response));
finish();
}
}
}
@Override
public void onFailure(Call<AddDocumentsResponse> call, Throwable t) {
messageUtil.hideProgressDialog();
messageUtil.showErrorToast("Something went wrong");
}
});
} else {
Toast.makeText(this, R.string.no_internet_connection, Toast.LENGTH_SHORT).show();
}
}
public static MultipartBody.Part prepareFilePart(Context context, String partName, String filePath) {
if(filePath!=null) {
File file = new File(filePath);
Log.d("TAG", "prepareFilePart: " + filePath);
// RequestBody requestBody = RequestBody.create(MediaType.parse(getContentResolver().getType(Uri.fromFile(file))), file);
// Libaray Required
RequestBody requestBody = RequestBody.create(MediaType.parse("image/*"), file);
// Multipart Camera and Gallery
// RequestBody requestBody = RequestBody.create(MediaType.parse(context.getContentResolver().getType(FileProvider.getUriForFile(context, "com.", file))), file);
return MultipartBody.Part.createFormData(partName, file.getName(), requestBody);
}
else {
return MultipartBody.Part.createFormData(partName,"");
}
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == CropImage.CROP_IMAGE_ACTIVITY_REQUEST_CODE) {
CropImage.ActivityResult result = CropImage.getActivityResult(data);
if (resultCode == RESULT_OK) {
Uri resultUri = result.getUri();
ll_profile_file.setVisibility(View.GONE);
img_photo_file.setVisibility(VISIBLE);
img_photo_file.setImageURI(resultUri);
picturePath = resultUri.getPath();
} else if (resultCode == CropImage.CROP_IMAGE_ACTIVITY_RESULT_ERROR_CODE) {
}
}
}
Fetch Device Contact Fast
ArrayList<Contact> listContacts;
listContacts = new ContactFetcher(this).fetchAll();
public class ContactPhone {
public String number;
public String type;
public ContactPhone(String number, String type) {
this.number = number;
this.type = type;
}
}
public class ContactFetcher {
private final Context context;
public ContactFetcher(Context c) {
this.context = c;
}
public ArrayList<Contact> fetchAll() {
String[] projectionFields = new String[]{
ContactsContract.Contacts._ID,
ContactsContract.Contacts.DISPLAY_NAME,
};
ArrayList<Contact> listContacts = new ArrayList<>();
CursorLoader cursorLoader = new CursorLoader(context,
ContactsContract.Contacts.CONTENT_URI,
projectionFields, // the columns to retrieve
null, // the selection criteria (none)
null, // the selection args (none)
null // the sort order (default)
);
Cursor c = cursorLoader.loadInBackground();
final Map<String, Contact> contactsMap = new HashMap<>(c.getCount());
if (c.moveToFirst()) {
int idIndex = c.getColumnIndex(ContactsContract.Contacts._ID);
int nameIndex = c.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME);
do {
String contactId = c.getString(idIndex);
String contactDisplayName = c.getString(nameIndex);
Contact contact = new Contact(contactId, contactDisplayName);
contactsMap.put(contactId, contact);
listContacts.add(contact);
} while (c.moveToNext());
}
c.close();
matchContactNumbers(contactsMap);
matchContactEmails(contactsMap);
return listContacts;
}
public void matchContactNumbers(Map<String, Contact> contactsMap) {
// Get numbers
final String[] numberProjection = new String[]{
Phone.NUMBER,
Phone.TYPE,
Phone.CONTACT_ID,
};
Cursor phone = new CursorLoader(context,
Phone.CONTENT_URI,
numberProjection,
null,
null,
null).loadInBackground();
if (phone.moveToFirst()) {
final int contactNumberColumnIndex = phone.getColumnIndex(Phone.NUMBER);
final int contactTypeColumnIndex = phone.getColumnIndex(Phone.TYPE);
final int contactIdColumnIndex = phone.getColumnIndex(Phone.CONTACT_ID);
while (!phone.isAfterLast()) {
final String number = phone.getString(contactNumberColumnIndex);
final String contactId = phone.getString(contactIdColumnIndex);
Contact contact = contactsMap.get(contactId);
if (contact == null) {
continue;
}
final int type = phone.getInt(contactTypeColumnIndex);
String customLabel = "Custom";
CharSequence phoneType = Phone.getTypeLabel(context.getResources(), type, customLabel);
contact.addNumber(number, phoneType.toString());
phone.moveToNext();
}
}
phone.close();
}
public void matchContactEmails(Map<String, Contact> contactsMap) {
// Get email
final String[] emailProjection = new String[]{
Email.DATA,
Email.TYPE,
Email.CONTACT_ID,
};
Cursor email = new CursorLoader(context,
Email.CONTENT_URI,
emailProjection,
null,
null,
null).loadInBackground();
if (email.moveToFirst()) {
final int contactEmailColumnIndex = email.getColumnIndex(Email.DATA);
final int contactTypeColumnIndex = email.getColumnIndex(Email.TYPE);
final int contactIdColumnsIndex = email.getColumnIndex(Email.CONTACT_ID);
while (!email.isAfterLast()) {
final String address = email.getString(contactEmailColumnIndex);
final String contactId = email.getString(contactIdColumnsIndex);
final int type = email.getInt(contactTypeColumnIndex);
String customLabel = "Custom";
Contact contact = contactsMap.get(contactId);
if (contact == null) {
continue;
}
CharSequence emailType = Email.getTypeLabel(context.getResources(), type, customLabel);
contact.addEmail(address, emailType.toString());
email.moveToNext();
}
}
email.close();
}
public class ContactEmail {
public String address;
public String type;
public ContactEmail(String address, String type) {
this.address = address;
this.type = type;
}
}
public class Contact {
public String id;
public String name;
public ArrayList<ContactEmail> emails;
public ArrayList<ContactPhone> numbers;
public Contact(String id, String name) {
this.id = id;
this.name = name;
this.emails = new ArrayList<ContactEmail>();
this.numbers = new ArrayList<ContactPhone>();
}
@Override
public String toString() {
String result = name;
if (numbers.size() > 0) {
ContactPhone number = numbers.get(0);
result += " (" + number.number + " - " + number.type + ")";
}
if (emails.size() > 0) {
ContactEmail email = emails.get(0);
result += " [" + email.address + " - " + email.type + "]";
}
return result;
}
public void addEmail(String address, String type) {
emails.add(new ContactEmail(address, type));
}
public void addNumber(String number, String type) {
numbers.add(new ContactPhone(number, type));
}
JSON ARRAY
Model model = new Model();
ArrayList<Model> contacts_arraylist=new ArrayList<>();
for (int i = 0; i < 50; i++)
{
model.setName("sanjay"+i);
model.setEmails("sanjay@gmail.com"+i);
model.setNumbers("89689527"+i);
contacts_arraylist.add(model);
}
JSONArray personarray=new JSONArray();
for (int j = 0; j < contacts_arraylist.size(); j++)
{
JSONObject person1 = new JSONObject();
try {
if(contacts_arraylist.get(j).getName()!=null)
{
person1.put("name", contacts_arraylist.get(j).getName());
}
else {
person1.put("name","");
}
if(contacts_arraylist.get(j).getEmails().length()>0)
{
person1.put("email", contacts_arraylist.get(j).getEmails());
}
else {
person1.put("email", "");
}
if(contacts_arraylist.get(j).getNumbers().length()>0)
{
person1.put("mobile_number", contacts_arraylist.get(j).getNumbers());
}
else {
person1.put("mobile_number", "");
}
personarray.put(person1);
} catch (JSONException e)
{
e.printStackTrace();
}
}
txt_array.setText(personarray.toString());
System.out.println("jsonString:---- " + personarray.toString());
}
于 2018-09-19T03:49:49.987 回答