方法一、把reba.db數據庫放在在android項目的 res文件夾下raw文件夾中
SQLitedb.java
public class SQLitedb {
private final int BUFFER_SIZE = 400000;
public static final String DB_NAME = "reba.db"; // 保存的數據庫文件名
public static final String PACKAGE_NAME = "com.develop.demo";//包名
public static final String DB_PATH = "/data"
+ Environment.getDataDirectory().getAbsolutePath() + "/"
+ PACKAGE_NAME; // 在手機裏存放數據庫的位置(/data/data/com.develop.demo/reba.db)
private SQLiteDatabase database;
private Context context;
public DBManager(Context context) {
this.context = context;
}
public SQLiteDatabase getDatabase() {
return database;
}
public void setDatabase(SQLiteDatabase database) {
this.database = database;
}
public void openDatabase() {
System.out.println(DB_PATH + "/" + DB_NAME);
this.database = this.openDatabase(DB_PATH + "/" + DB_NAME);
}
/**導入打開數據庫*/
private SQLiteDatabase openDatabase(final String dbfile) {
new Thread() {
public void run() {
try {
if (!(new File(dbfile).exists())) {
// 判斷數據庫文件是否存在,若不存在則執行導入,否則直接打開數據庫
InputStream is = context.getResources()
.openRawResource(R.raw.reba); // 欲導入的數據庫
FileOutputStream fos = new FileOutputStream(dbfile);
byte[] buffer = new byte[BUFFER_SIZE];
int count = 0;
while ((count = is.read(buffer)) > 0) {
fos.write(buffer, 0, count);
}
fos.close();
is.close();
}
} catch (FileNotFoundException e) {
Log.e("Database", "File not found");
e.printStackTrace();
} catch (IOException e) {
Log.e("Database", "IO exception");
e.printStackTrace();
}
}
}.start();
if (new File(dbfile).exists()) {
SQLiteDatabase db = SQLiteDatabase.openOrCreateDatabase(dbfile,
null);
return db;
}
return null;
}
/**關閉數據庫*/
public void closeDatabase() {
if (this.database != null){
this.database.close();
this.database = null;
}
}
}
主Activity中示例化一個SQLitedb對象
public class MainActivity extends Activity {
public SQLitedb sqldb;
/** 本地數據庫 **/
public static SQLiteDatabase database = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//首次執行導入.db文件
sqldb = new SQLitedb(this);
sqldb.openDatabase();
sqldb.closeDatabase();
database = SQLiteDatabase.openOrCreateDatabase(SQLitedb.DB_PATH + "/"
+ SQLitedb.DB_NAME, null);
}
}
方法二、把reba數據庫放在在android項目的 assets 文件夾中
SQLitedb.java
public class SQLitedb {
private final int BUFFER_SIZE = 400000;
public static final String DB_NAME = "reba"; // 保存的數據庫文件名
public static final String PACKAGE_NAME = "faai.develop.cailiao";// 包名
public static final String DB_PATH = "/data"
+ Environment.getDataDirectory().getAbsolutePath() + "/"
+ PACKAGE_NAME + "/databases"; // 在手機裏存放數據庫的位置(/data/data/faai.develop.cailiao/databases/reba)
private SQLiteDatabase database;
private Context context;
public DBManager(Context context) {
this.context = context;
}
public SQLiteDatabase getDatabase() {
return database;
}
public void setDatabase(SQLiteDatabase database) {
this.database = database;
}
public void openDatabase() {
System.out.println(DB_PATH + "/" + DB_NAME);
this.database = this.openDatabase(DB_PATH + "/" + DB_NAME);
}
/** 導入打開數據庫 */
private SQLiteDatabase openDatabase(final String dbfile) {
new Thread() {
public void run() {
if ((new File(DB_PATH + "/" + DB_NAME)).exists() == false) {
File f = new File(DB_PATH);
if (!f.exists()) {
f.mkdir();
}
try {
// 得到assets目錄下我們準備好的sqlite數據庫作爲輸入流
InputStream is = context.getAssets().open(
DB_NAME);
OutputStream os = new FileOutputStream(DB_PATH + "/"
+ DB_NAME);
// 文件寫入
byte[] buffer = new byte[1024];
int length;
System.out.println("reading start!");
while ((length = is.read(buffer)) > 0) {
os.write(buffer, 0, length);
System.out.println(buffer);
}
System.out.println("reading end!");
// 關閉流文件
os.flush();
os.close();
is.close();
} catch (FileNotFoundException e) {
Log.e("Database", "File not found");
e.printStackTrace();
} catch (IOException e) {
Log.e("Database", "IO exception");
e.printStackTrace();
}
}
}
}.start();
if (new File(dbfile).exists()) {
SQLiteDatabase db = SQLiteDatabase.openOrCreateDatabase(dbfile,
null);
return db;
}
return null;
}
/** 關閉數據庫 */
public void closeDatabase() {
if (this.database != null) {
this.database.close();
this.database = null;
}
}
}
public class MainActivity extends Activity {
public SQLitedb sqldb;
/** 本地數據庫 **/
public static SQLiteDatabase database = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//首次執行導入.db文件
sqldb = new SQLitedb(this);
sqldb.openDatabase();
sqldb.closeDatabase();
database = SQLiteDatabase.openOrCreateDatabase(SQLitedb.DB_PATH + "/"
+ SQLitedb.DB_NAME, null);
}
}