Android 来自数据库的条形图
嗨,我是android新手,我已经编写了以下代码来绘制折线图。我正在使用数据库将值传递给图形,但图形没有打印 你能告诉我如何改变下面的代码来画一个条形图吗Android 来自数据库的条形图,android,database,sqlite,bar-chart,achartengine,Android,Database,Sqlite,Bar Chart,Achartengine,嗨,我是android新手,我已经编写了以下代码来绘制折线图。我正在使用数据库将值传递给图形,但图形没有打印 你能告诉我如何改变下面的代码来画一个条形图吗 import org.achartengine.ChartFactory; import org.achartengine.chart.PointStyle; import org.achartengine.model.TimeSeries; import org.achartengine.model.XYMultipleSeriesData
import org.achartengine.ChartFactory;
import org.achartengine.chart.PointStyle;
import org.achartengine.model.TimeSeries;
import org.achartengine.model.XYMultipleSeriesDataset;
import org.achartengine.renderer.XYMultipleSeriesRenderer;
import org.achartengine.renderer.XYSeriesRenderer;
import android.app.Activity;
import android.content.ContentValues;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.database.DatabaseErrorHandler;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;
import android.graphics.Color;
public class ChartActivity<BMICalculatorDB> extends Activity{
public ChartActivity() {
super();
}
public ChartActivity(Context context, String name, CursorFactory factory,
int version, DatabaseErrorHandler errorHandler) {
super();
// TODO Auto-generated constructor stub
}
public static final String KEY_BMIID = "bmi_id";
public static final String KEY_BMIDATA = "bmi_data";
public static final String KEY_BMIDATE = "bmi_date";
private static final String DATABASE_NAME = "Jayant";
private static final String DATABASE_TABLE = "android_metadata";
private static final int DATABASE_VERSION = 2;
private DBHelper ourHelper;
private static Context ourContext;
private SQLiteDatabase ourDatabase;
private static class DBHelper extends SQLiteOpenHelper{
public DBHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
// TODO Auto-generated constructor stub
}
@Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
db.execSQL( "CREATE TABLE " + DATABASE_TABLE + " (" +
KEY_BMIID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
KEY_BMIDATA + " TEXT NOT NULL, " +
KEY_BMIDATE + " TEXT NOT NULL );"
);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
db.execSQL( "DROP TABLE IF EXISTS " + DATABASE_TABLE );
onCreate(db);
}
}
public void BMICalculatorDB(Context c){
ourContext = c;
}
@SuppressWarnings("unchecked")
public BMICalculatorDB open(){
ourHelper = new DBHelper(ourContext);
ourDatabase = ourHelper.getWritableDatabase();
return (BMICalculatorDB) this;
}
public void close(){
ourHelper.close();
}
public long createEntry( String data, String date ) {
//, String date
// TODO Auto-generated method stub
ContentValues cv = new ContentValues();
cv.put(KEY_BMIDATA, data);
cv.put(KEY_BMIDATE, date);
return ourDatabase.insert(DATABASE_TABLE, null, cv);
}
public String getBMIID() {
// TODO Auto-generated method stub
String[] column =
new String[]{ KEY_BMIID };
Cursor c =
ourDatabase.query(DATABASE_TABLE, column, null, null, null, null, null);
String result = "";
int iID = c.getColumnIndex(KEY_BMIID);
for ( c.moveToFirst(); ! c.isAfterLast(); c.moveToNext() ){
result = result + c.getString(iID);
}
return result;
}
public String getBMIDataData(){
String[] column =
new String[]{ KEY_BMIDATA };
Cursor c =
ourDatabase.query( DATABASE_TABLE, column, null, null, null, null, null );
String result = "";
int iData = c.getColumnIndex( KEY_BMIDATA );
for ( c.moveToFirst(); ! c.isAfterLast(); c.moveToNext() ){
result = result + c.getString( iData );
}
return result;
}
public String getBMIDateData(){
String[] column =
new String[]{ KEY_BMIDATE };
Cursor c =
ourDatabase.query( DATABASE_TABLE, column, null, null, null, null, null );
String result = "";
int iDate = c.getColumnIndex( KEY_BMIDATE);
for ( c.moveToFirst(); ! c.isAfterLast(); c.moveToNext() ){
result = result + c.getString( iDate );
}
return result;
}
public void updateEntry( long lId, String mData, String mDate ) {
// TODO Auto-generated method stub
ContentValues cvUpdate = new ContentValues();
cvUpdate.put( KEY_BMIDATA, mData );
cvUpdate.put( KEY_BMIDATE, mDate );
ourDatabase.update( DATABASE_TABLE, cvUpdate, KEY_BMIID + " = lId", null );
}
public String getData(long l) {
// TODO Auto-generated method stub
return null;
}
public String getDate(long l) {
// TODO Auto-generated method stub
return null;
}
public XYMultipleSeriesDataset getDemoDataset(String title) {
String[] column =
new String[]{ KEY_BMIDATA };
Cursor c = ourHelper.getWritableDatabase().query( DATABASE_TABLE, column, null, null, null, null, null );
XYMultipleSeriesDataset dataset = new XYMultipleSeriesDataset();
TimeSeries series = new TimeSeries("Bar1");
TimeSeries series2 = new TimeSeries(title);
getBMIDataData();
while (!c.isAfterLast()) {
int date = c.getInt((Integer) c.getColumnIndexOrThrow("DAYS"));
int weight = c.getInt((Integer) c.getColumnIndexOrThrow("TOP 10"));
series2.add(weight, date);
c.moveToNext();
}
c.close();
dataset.addSeries(series);
dataset.addSeries(series2);
return dataset;
}
public Intent getIntent(Context context) {
//Lager TimeSeries for den første linja
XYMultipleSeriesDataset dataset = getDemoDataset("Bar1");
//Kode for render
XYMultipleSeriesRenderer mRenderer = new XYMultipleSeriesRenderer();
//Optimalisering linje1
XYSeriesRenderer renderer = new XYSeriesRenderer();
renderer.setColor(Color.YELLOW);
renderer.setPointStyle(PointStyle.CIRCLE);
renderer.setFillPoints(true);
// Optimalisering linje2 husk rekke følgen
XYSeriesRenderer renderer2 = new XYSeriesRenderer();
renderer2.setColor(Color.BLUE);
renderer2.setPointStyle(PointStyle.SQUARE);
renderer2.setFillPoints(true);
//Legger til render seriene
mRenderer.addSeriesRenderer(renderer);
//Optimalisering grafen
mRenderer.setChartTitle("Test");
mRenderer.setZoomEnabled(true);
mRenderer.setZoomButtonsVisible(true);
mRenderer.setBackgroundColor(Color.BLACK);
mRenderer.setApplyBackgroundColor(true);
mRenderer.setXTitle("Dager");
mRenderer.setShowGrid(true);
mRenderer.addSeriesRenderer(renderer2);
Intent intent = ChartFactory.getLineChartIntent(context, dataset,
mRenderer, "Bar Graph Title");
return intent;
}
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
}
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
}
}
import org.achartengine.ChartFactory;
导入org.achartengine.chart.PointStyle;
导入org.achartengine.model.TimeSeries;
导入org.achartengine.model.xymultiplesseriesdataset;
导入org.achartengine.renderer.XYMultipleSeriesRenderer;
导入org.achartengine.renderer.XYSeriesRenderer;
导入android.app.Activity;
导入android.content.ContentValues;
导入android.content.Context;
导入android.content.Intent;
导入android.database.Cursor;
导入android.database.DatabaseErrorHandler;
导入android.database.sqlite.SQLiteDatabase;
导入android.database.sqlite.SQLiteDatabase.CursorFactory;
导入android.database.sqlite.SQLiteOpenHelper;
导入android.graphics.Color;
公共类活动扩展了活动{
公共活动(){
超级();
}
公共图表活动(上下文上下文、字符串名称、游标工厂、,
int版本,DatabaseErrorHandler(错误处理程序){
超级();
//TODO自动生成的构造函数存根
}
公共静态最终字符串键\u bmid=“bmi\u id”;
公共静态最终字符串键\u BMIDATA=“bmi\u data”;
公共静态最终字符串键\u BMIDATE=“bmi\u date”;
私有静态最终字符串数据库\u NAME=“Jayant”;
私有静态最终字符串数据库\u TABLE=“android\u元数据”;
私有静态最终int数据库_VERSION=2;
私人助理;
私有静态语境;
私有SQLITE数据库;
私有静态类DBHelper扩展了SQLiteOpenHelper{
公共DBHelper(上下文){
super(上下文、数据库名称、null、数据库版本);
//TODO自动生成的构造函数存根
}
@凌驾
public void onCreate(SQLiteDatabase db){
//TODO自动生成的方法存根
db.execSQL(“创建表”+数据库表+”(“+
密钥\u bmid+“整数主键自动递增,”+
密钥\u BMIDATA+“文本不为空,”+
键“\u BMIDATE+”文本不为空“;”
);
}
@凌驾
public void onUpgrade(SQLiteDatabase db,int-oldVersion,int-newVersion){
//TODO自动生成的方法存根
db.execSQL(“如果存在删除表”+数据库_表);
onCreate(db);
}
}
公共关系数据库B(上下文c){
ourContext=c;
}
@抑制警告(“未选中”)
公共计算数据库开放(){
ourHelper=newdbhelper(ourContext);
ourDatabase=ourHelper.getWritableDatabase();
返回(b)这个;
}
公众假期结束(){
ourHelper.close();
}
公共长createEntry(字符串数据、字符串日期){
//,字符串日期
//TODO自动生成的方法存根
ContentValues cv=新的ContentValues();
cv.put(关键数据、数据);
cv.put(关键日期、日期);
返回ourDatabase.insert(DATABASE_TABLE,null,cv);
}
公共字符串getbmid(){
//TODO自动生成的方法存根
字符串[]列=
新字符串[]{KEY_bmid};
光标c=
query(数据库表,列,null,null,null,null,null,null);
字符串结果=”;
int iID=c.getColumnIndex(键\u bmid);
for(c.moveToFirst();!c.isAfterLast();c.moveToNext()){
结果=结果+c.getString(iID);
}
返回结果;
}
公共字符串getBMIDataData(){
字符串[]列=
新字符串[]{KEY_BMIDATA};
光标c=
query(数据库表,列,null,null,null,null,null,null);
字符串结果=”;
int iData=c.getColumnIndex(关键数据);
for(c.moveToFirst();!c.isAfterLast();c.moveToNext()){
结果=结果+c.getString(iData);
}
返回结果;
}
公共字符串getBMIDateData(){
字符串[]列=
新字符串[]{KEY_BMIDATE};
光标c=
query(数据库表,列,null,null,null,null,null,null);
字符串结果=”;
int iDate=c.getColumnIndex(键日期);
for(c.moveToFirst();!c.isAfterLast();c.moveToNext()){
结果=结果+c.getString(iDate);
}
返回结果;
}
public void updateEntry(长盖、字符串mData、字符串mDate){
//TODO自动生成的方法存根
ContentValues cvUpdate=新ContentValues();
cvUpdate.put(KEY_BMIDATA,mData);
cvUpdate.put(KEY_BMIDATE,mDate);
update(DATABASE_TABLE,cvUpdate,KEY_bmid+“=lId”,null);
}
公共字符串getData(长l){
//TODO自动生成的方法存根
返回null;
}
公共字符串getDate(长l){
//TODO自动生成的方法存根
返回null;
}
公共XYMultipleSeriesDataset getDemoDataset(字符串标题){
字符串[]列=
新字符串[]{KEY_BMIDATA};
游标c=ourHelper.getWritableDatabase().query(数据库表,列,null,null,null,null);
XYmultiplesseriesdataset数据集=新的XYmultiplesseriesdatas
public ChartActivity() {
super();
}
Caused by: java.lang.InstantiationException: can't instantiate class flu.solutions.travelsense.ChartActivity; no empty constructor