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목록보기 항목을 클릭하면 데이터베이스의 해당 데이터가 두 번째 활동에 표시되어야합니다. textview 대답이 있지만 한 가지 문제가 있습니다. 각 범주의 마지막 데이터 만 가져옵니다. 특정 카테고리의 모든 데이터가 필요합니다.sqlitedatabase에서 데이터 가져 오기
이 문제는이 두 번째 활성
Bundle bundle = getIntent().getExtras();
String message = bundle.getString("title");
String message1 = bundle.getString("title1");
TextView txtView = (TextView) findViewById(R.id.textView1);
txtView.setText(message);
TextView txtView1 = (TextView) findViewById(R.id.TextView2);
txtView1.setText(message1);
이 내 코드 주요 활동 방법
public class MainActivity extends ActionBarActivity {
DatabaseHelper dbHeplper;
ListAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
dbHeplper = new DatabaseHelper(getApplicationContext());
try {
dbHeplper.createDataBase();
} catch (IOException e) {
e.printStackTrace();
}
ListView lvUsers= (ListView)findViewById(R.id.lvUsers);
final List<String> listUsers = dbHeplper.getAllUsers();
if(listUsers != null){
adapter = new ArrayAdapter<String>(getApplicationContext(),
android.R.layout.simple_list_item_1, android.R.id.text1,
listUsers);
lvUsers.setAdapter(adapter);
}
lvUsers.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
String Desc =(String) dbHeplper.getPostDesc(listUsers.get(position));
String title1 =(String) dbHeplper.getPostdesc(listUsers.get(position));
Toast.makeText(getApplicationContext(),
"Desc is: " + Desc, Toast.LENGTH_LONG)
.show();
Toast.makeText(getApplicationContext(),
"Desc is: " + title1, Toast.LENGTH_LONG)
.show();
Intent newActivity0 = new Intent(MainActivity.this, Second.class);
newActivity0.putExtra("title", Desc);
newActivity0.putExtra("title1", title1);
startActivity(newActivity0);
}
});
}
내 코드 데이터베이스
public class DatabaseHelper extends SQLiteOpenHelper {
public static String DB_PATH = "/data/data/com.example.freshdatabase/databases/";
public static String DB_NAME = "Android.sqlite";
public static final int DB_VERSION = 1;
public static final String TB_USER = "Users";
private SQLiteDatabase myDB;
private Context context;
public DatabaseHelper(Context context) {
super(context, DB_NAME, null, DB_VERSION);
this.context = context;
}
@Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
}
@Override
public synchronized void close(){
if(myDB!=null){
myDB.close();
}
super.close();
}
private boolean checkDataBase() {
SQLiteDatabase tempDB = null;
try {
String myPath = DB_PATH + DB_NAME;
tempDB = SQLiteDatabase.openDatabase(myPath, null,
SQLiteDatabase.OPEN_READWRITE);
} catch (SQLiteException e) {
Log.e("tle99 - check", e.getMessage());
}
if (tempDB != null)
tempDB.close();
return tempDB != null ? true : false;
}
public void copyDataBase() throws IOException{
try {
InputStream myInput = context.getAssets().open(DB_NAME);
String outputFileName = DB_PATH + DB_NAME;
OutputStream myOutput = new FileOutputStream(outputFileName);
byte[] buffer = new byte[1024];
int length;
while((length = myInput.read(buffer))>0){
myOutput.write(buffer, 0, length);
}
myOutput.flush();
myOutput.close();
myInput.close();
} catch (Exception e) {
Log.e("tle99 - copyDatabase", e.getMessage());
}
}
public void openDataBase() throws SQLException{
String myPath = DB_PATH + DB_NAME;
myDB = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READWRITE);
}
public void createDataBase() throws IOException {
boolean dbExist = checkDataBase();
if (dbExist) {
} else {
this.getReadableDatabase();
try {
copyDataBase();
} catch (IOException e) {
Log.e("tle99 - create", e.getMessage());
}
}
}
public List<String> getAllUsers(){
List<String> listUsers = new ArrayList<String>();
SQLiteDatabase db = this.getWritableDatabase();
Cursor c;
try {
c = db.rawQuery("SELECT * FROM " + TB_USER , null);
if(c == null) return null;
String id;
String name ;
c.moveToFirst();
do {
name = c.getString(1);
listUsers.add(name);
} while (c.moveToNext());
c.close();
} catch (Exception e) {
Log.e("tle99", e.getMessage());
}
db.close();
return listUsers;
}
public String getPostDesc(String Name){
String desc = "";
SQLiteDatabase db = this.getWritableDatabase();
Cursor c;
try {
c = db.rawQuery("Select * from Post INNER JOIN Users ON Users.ID=Post.ID WHERE NAME='"+Name+"'" , null);
if(c == null) return null;
while (c.moveToNext()) {
desc=c.getString(1);
System.out.println(desc);
}
c.close();
} catch (Exception e) {
Log.e("tle99", e.getMessage());
}
db.close();
return desc;
}
public String getPostdesc(String name){
String title="";
SQLiteDatabase db = this.getWritableDatabase();
Cursor c;
try {
c = db.rawQuery("Select * from Post INNER JOIN Users ON Users.ID=Post.ID WHERE NAME='"+name+"'" , null);
if(c == null) return null;
if(c.moveToFirst()){
title= c.getString(2);
}
{
}
c.close();
} catch (Exception e) {
Log.e("tle99", e.getMessage());
}
db.close();
return title;
}
}
로부터 데이터를 검색하기위한 제 코드 내 데이터베이스 테이블입니다
무엇이'listU sers'? –
왜 1 차 데이터베이스에서 충돌 ID를 사용 했습니까 ?? –
Desc는 무엇을 의미합니까? 제목은 무엇입니까? 내가 틀리면'getPostDesc'를 호출합니다. 왜 같은 사용자에 대해 다른 값을 반환합니까? 코드가 명확하지 않습니다. –