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我想製作一個報價應用程序，顯示報價，作者和收藏按鈕。從SQLite獲取數據到ListView的ArrayList
我有2個textViews一個自定義的ListView，和1個切換按鈕
我使用SQLite與預填充數據（所以我已經把所有的數據）
如何顯示報價和作者到2個textviews不使用SimpleCursorAdapter
我希望它使用ArrayList和ArrayAdapter
這是代碼
使DatabaseOpenHelper.java
public class DatabaseOpenHelper extends SQLiteAssetHelper {
private static final String DATABASE_NAME = "mqn.db";
private static final int DATABASE_VERSION = 1;
private static final String TABLE_NAME = "quote";
public static final String COLUMN_ID = "_id";
public static final String COLUMN_QUOTES = "quotesText";
public static final String COLUMN_AUTHOR= "author";
public static final String COLUMN_FAV = "fav";
public static final String COLUMN_GENRE = "genre";
private SQLiteDatabase database;
private final Context context;
// database path
private static String DATABASE_PATH;
/** constructor (Menambil PATH ke file database) */
public DatabaseOpenHelper(Context ctx) {
super(ctx, DATABASE_NAME, null, DATABASE_VERSION);
this.context = ctx;
DATABASE_PATH = context.getFilesDir().getParentFile().getPath()
+ "/databases/";
}
/**
* Creates a empty database on the system and rewrites it with your own
* database.
* */
public void create() throws IOException {
boolean check = checkDataBase();
SQLiteDatabase db_Read = null;
// Creates empty database default system path
db_Read = this.getWritableDatabase();
db_Read.close();
try {
if (!check) {
copyDataBase();
}
} catch (IOException e) {
throw new Error("Error copying database");
}
}
/**
* Check if the database already exist to avoid re-copying the file each
* time you open the application.
*
* @return true if it exists, false if it doesn't
*/
private boolean checkDataBase() {
SQLiteDatabase checkDB = null;
try {
String myPath = DATABASE_PATH + DATABASE_NAME;
checkDB = SQLiteDatabase.openDatabase(myPath, null,
SQLiteDatabase.OPEN_READWRITE);
} catch (SQLiteException e) {
// database does't exist yet.
}
if (checkDB != null) {
checkDB.close();
}
return checkDB != null ? true : false;
}
/**
* Copies your database from your local assets-folder to the just created
* empty database in the system folder, from where it can be accessed and
* handled. This is done by transfering bytestream.
* */
private void copyDataBase() throws IOException {
// Open your local db as the input stream
InputStream myInput = context.getAssets().open(DATABASE_NAME);
// Path to the just created empty db
String outFileName = DATABASE_PATH + DATABASE_NAME;
// Open the empty db as the output stream
OutputStream myOutput = new FileOutputStream(outFileName);
// transfer bytes from the inputfile to the outputfile
byte[] buffer = new byte[1024];
int length;
while ((length = myInput.read(buffer)) > 0) {
myOutput.write(buffer, 0, length);
}
// Close the streams
myOutput.flush();
myOutput.close();
myInput.close();
}
/** Start DB from here */
/** open the database */
public void open() throws SQLException {
String myPath = DATABASE_PATH + DATABASE_NAME;
database = SQLiteDatabase.openDatabase(myPath, null,
SQLiteDatabase.OPEN_READWRITE);
}
/** close the database */
@Override
public synchronized void close() {
if (database != null)
database.close();
super.close();
}
// insert a user into the database
public long insertUser(String quotesText, String author, String fav) {
ContentValues initialValues = new ContentValues();
initialValues.put(COLUMN_QUOTES, quotesText);
initialValues.put(COLUMN_AUTHOR, author);
initialValues.put(COLUMN_FAV, fav);
return database.insert(TABLE_NAME, null, initialValues);
}
// updates a user
public boolean updateUser(long rowId, String fav) {
ContentValues args = new ContentValues();
args.put(COLUMN_FAV, fav);
return database.update(TABLE_NAME, args, COLUMN_ID + "=" + rowId, null) > 0;
}
// retrieves a particular user
public Cursor getUser(long rowId) throws SQLException {
Cursor mCursor = database.query(true, TABLE_NAME, new String[] {
COLUMN_ID, COLUMN_QUOTES, COLUMN_AUTHOR, COLUMN_FAV },
COLUMN_ID + " = " + rowId, null, null, null, null, null);
if (mCursor != null) {
mCursor.moveToFirst();
}
return mCursor;
}
// delete a particular user
public boolean deleteContact(long rowId) {
return database.delete(TABLE_NAME, COLUMN_ID + "=" + rowId, null) > 0;
}
// retrieves all users
public Cursor getAllUsers() {
return database.query(TABLE_NAME, new String[] { COLUMN_ID,
COLUMN_QUOTES, COLUMN_AUTHOR, COLUMN_FAV }, null, null,
null, null, null);
}
public Cursor getCertain(String valueGenre) {
String WHERE = "genre = ?";
String[] VALUE = new String[] {valueGenre};
return database.query(TABLE_NAME, new String[]{COLUMN_ID,
COLUMN_QUOTES, COLUMN_AUTHOR, COLUMN_FAV}, WHERE, VALUE,
null, null, null);
}
quotes_listview（自定義的ListView）
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:id="@+id/linearLayout">
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="New Text"
android:id="@+id/txtQuote"
style="@style/QuotesFont"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_rowWeight="1"
android:layout_weight="1"
android:layout_margin="15dp" />
<ToggleButton
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/heartImage"
android:layout_alignParentTop="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:layout_marginTop="30dp"
android:background="@drawable/fav"
android:textOff=""
android:textOn=""
android:layout_rowWeight="1"
android:layout_weight="3"
android:descendantFocusability="blocksDescendants"
android:layout_marginLeft="30dp"
android:layout_marginRight="15dp" />
</LinearLayout>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New Text"
android:id="@+id/txtAuthor"
style="@style/AuthorFont"
android:layout_below="@+id/linearLayout"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginLeft="15dp"
android:layout_marginBottom="5dp" />
<!--<TextView-->
<!--android:layout_width="wrap_content"-->
<!--android:layout_height="wrap_content"-->
<!--android:text="New Text"-->
<!--android:id="@+id/text2"-->
<!--android:layout_below="@+id/text1"-->
<!--android:layout_alignParentRight="true"-->
<!--android:layout_alignParentEnd="true"-->
<!--style="@style/AuthorFont"-->
<!--android:layout_marginBottom="10dp"-->
<!--android:layout_rowWeight="1"-->
<!--android:layout_weight="1" />-->
ListOfQuotes.java
public class ListOfQuotes {
private String quote;
private String author;
private int fav;
public ListOfQuotes() {
}
public ListOfQuotes(String quote, String author, int fav) {
this.quote = quote;
this.author = author;
this.fav = fav;
}
public ListOfQuotes(String quote, String author) {
this.quote = quote;
this.author = author;
}
public String getQuote() {
return quote;
}
public void setQuote(String quote) {
this.quote = quote;
}
public String getAuthor() {
return author;
}
public void setAuthor(String author) {
this.author = author;
}
public int getFav() {
return fav;
}
public void setFav(int fav) {
this.fav = fav;
}
}
QuotesAdapter.java
public class QuotesAdapter extends BaseAdapter {
private Activity activity;
private ArrayList<ListOfQuotes> data;
private LayoutInflater inflater;
boolean isSelected = false;
ToggleButton imgHeart;
public QuotesAdapter(Activity activity, ArrayList<ListOfQuotes> data) {
this.activity = activity;
this.data = data;
this.inflater = (LayoutInflater) activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public int getCount() {
return data.size();
}
@Override
public Object getItem(int position) {
return data.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ListOfQuotes loq = data.get(position);
if(convertView == null)
{
convertView = inflater.inflate(R.layout.quotes_listview, null);
}
TextView txtQuotes = (TextView) convertView.findViewById(R.id.txtQuote);
TextView txtAuthors = (TextView) convertView.findViewById(R.id.txtAuthor);
imgHeart = (ToggleButton) convertView.findViewById(R.id.heartImage);
txtQuotes.setText(loq.getQuote());
txtAuthors.setText(loq.getAuthor());
return convertView;
}
}
QuotesActivity.java
public class QuotesActivity extends AppCompatActivity {
ListView quotesList;
DatabaseOpenHelper myDbHelper;
ArrayList<ListOfQuotes> arrQuotes;
QuotesAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_quotes);
myDbHelper = new DatabaseOpenHelper(this);
try {
// check if database exists in app path, if not copy it from assets
myDbHelper.create();
} catch (IOException ioe) {
throw new Error("Unable to create database");
}
try {
// open the database
myDbHelper.open();
myDbHelper.getWritableDatabase();
} catch (SQLException sqle) {
throw sqle;
}
arrQuotes = new ArrayList<ListOfQuotes>();
quotesList = (ListView) findViewById(R.id.quotesList);
adapter = new QuotesAdapter(QuotesActivity.this, arrQuotes);
quotesList.setAdapter(adapter);
我不知道如何在這之後做到這一點。
使用'自定義列表View'用'基地Adapter'。 –
是的，已經使用BaseAdapter自定義ListView，我只是不知道如何顯示它[已編輯我的帖子]。 –
@HendraSetiawan - 看起來你已經完成了80％的編碼！這裏發生了什麼問題？您是否收到任何錯誤或ListView無法正常工作？ –