我将用sqlite编写一个示例代码,它必须同时适用于ANdroid和IOS(以及桌面)
这是我的 build.gradle
buildscript {
repositories {
jcenter()
mavenCentral()
maven { url 'https://oss.sonatype.org/content/repositories/snapshots' }
}
dependencies { classpath 'org.javafxports:jfxmobile-plugin:1.0.6' }
}
apply plugin: 'org.javafxports.jfxmobile'
repositories {
jcenter()
mavenCentral()
maven { url 'https://oss.sonatype.org/content/repositories/snapshots' }
maven { url 'https://oss.sonatype.org/content/repositories/releases' }
}
ext.CHARM_DOWN_VERSION = "1.0.0"
dependencies {
compile 'mysql:mysql-connector-java:3.1.12'
//compile 'org.xerial:sqlite-jdbc:3.9.0-SNAPSHOT'
compile 'org.sqldroid:sqldroid:1.0.3'
compile "com.gluonhq:charm-down-common:$CHARM_DOWN_VERSION"
desktopRuntime "com.gluonhq:charm-down-desktop:$CHARM_DOWN_VERSION"
//desktopRuntime 'org.xerial:sqlite-jdbc:3.9.0-SNAPSHOT'
androidRuntime "com.gluonhq:charm-down-android:$CHARM_DOWN_VERSION"
androidRuntime 'org.sqldroid:sqldroid:1.0.3'
iosRuntime "com.gluonhq:charm-down-ios:$CHARM_DOWN_VERSION"
}
mainClassName = 'com.version17.Version17'
jfxmobile {
android {
manifest = 'src/android/AndroidManifest.xml'
packagingOptions {
exclude 'META-INF/INDEX.LIST'
}
}
ios {
infoPList = file('src/ios/Default-Info.plist')
forceLinkClasses = ['com.version17.**.*', 'com.mysql.**.*', 'SQLite.**.*', 'com.gluonhq.**.*']
}
}
sqliteHelper.java
public static void testSqli() throws SQLException, ClassNotFoundException{
Class.forName("SQLite.JDBCDriver");
String dbName = "mtt8.db";
File dir = null;
try {
dir = PlatformFactory.getPlatform().getPrivateStorage();
} catch (IOException e) {
e.printStackTrace();
}
File db = new File (dir, dbName);
String dbUrl = "jdbc:sqlite:" + db.getAbsolutePath();
Connection conn = DriverManager.getConnection(dbUrl);
//create table
Statement st=null;
st = conn.createStatement();
st.executeUpdate("DROP TABLE IF EXISTS village;");
st.executeUpdate("CREATE table village (id int, name varchar(20))");
//insert row
for (int i=0; i<50; i++){
st.executeUpdate("INSERT INTO village VALUES (" +i+ ", 'Erkan Kaplan')");
}
//select
String query = "SELECT id, name from village";
ResultSet rs = null;
rs = st.executeQuery(query);
while(rs.next()) {
int id = 0;
id = rs.getInt(1);
String name = null;
name = rs.getString(2);
System.out.println("id:"+ id+ ", name: "+ name);
st.executeUpdate("DELETE from village");
rs.close();
}
}
这项工作适用于Ipad设备和桌面,但不适用于Android设备(如三星平板电脑)。
任何人都可以请问我为什么上面这段代码不适用于三星平板电脑?或者哪个取决于我必须添加我的代码?
感谢 Erkan Kaplan
答案 0 :(得分:2)
您可以为每个平台加载所需的驱动程序,并使用Gluon Charm-Down了解该平台并加载它。
在IDE上使用Gluon plugin,在build.gradle
文件中,根据平台可以轻松添加不同的依赖项。
修改强>
也添加了桌面。
对于桌面,我们可以使用org.sqlite.JDBC
,而对于Android,我们可以使用org.sqldroid.SQLDroidDriver
。对于iOS,由于Robovm已经包含SQLite.JDBCDriver
,因此不需要依赖。
repositories {
jcenter()
maven {
url 'https://oss.sonatype.org/content/repositories/snapshots'
}
}
ext.CHARM_DOWN_VERSION = "1.0.0"
dependencies{
compile "com.gluonhq:charm-down-common:$CHARM_DOWN_VERSION"
desktopRuntime "com.gluonhq:charm-down-desktop:$CHARM_DOWN_VERSION"
desktopRuntime 'org.xerial:sqlite-jdbc:3.9.0-SNAPSHOT'
androidRuntime "com.gluonhq:charm-down-android:$CHARM_DOWN_VERSION"
androidRuntime 'org.sqldroid:sqldroid:1.0.3'
iosRuntime "com.gluonhq:charm-down-ios:$CHARM_DOWN_VERSION"
}
但我们需要将其添加到forceLinkClasses
选项:
jfxmobile {
android {
manifest = 'src/android/AndroidManifest.xml'
}
ios {
forceLinkClasses = [ 'your.package.**.*', 'SQLite.**.*']
infoPList = file('src/ios/Default-Info.plist')
}
}
现在,在您的代码中,您可以加载一个驱动程序或另一个驱动程序,具体取决于运行该应用程序的平台,并创建一个连接,提供如所讨论的本地路径here:
private void testSqli() throws SQLException, ClassNotFoundException {
if (JavaFXPlatform.isAndroid()) {
Class.forName("org.sqldroid.SQLDroidDriver");
} else if (JavaFXPlatform.isIOS()) {
Class.forName("SQLite.JDBCDriver");
} else if (JavaFXPlatform.isDesktop()) {
Class.forName("org.sqlite.JDBC");
}
File dir;
String dbUrl = "jdbc:sqlite:";
try {
dir = PlatformFactory.getPlatform().getPrivateStorage();
String dbName = "yourDatabase.db";
File db = new File (dir, dbName);
dbUrl = dbUrl + db.getAbsolutePath();
Connection conn = DriverManager.getConnection(dbUrl);
...
} catch (IOException ex) { }
}
现在您应该可以在桌面,Android和iOS上运行它。 我已经使用NetBeans和IntelliJ对其中的三个进行了测试,但前者比后者更好地管理平台依赖。