Fitur Chart atau Grafik termasuk fitur tambahan yang paling banyak digunakan di suatu Aplikasi. Begitu juga dengan di Android. Masalahnya adalah di Android tidak menyediakan Komponen Grafik (Chart) secara Default. Solusinya kita gunakan Chart Component dari luar yaitu AChartEngine. Dapat didownload di http://code.google.com/p/achartengine/.Pertama buat project Android seperti biasa. Kemudian kita letakkan file library AChartEngine, misal yang penulis gunakan adalah achartengine-1.0.0.jar, dicopy dari Explorer, buka Eclipse, buka folder libs di project yang sedang dibuat kemudian Paste.
Setelah itu tuliskan kode program di MainActivity.java sebagai berikut :
package com.example.androidchart;
import java.util.Random;
import org.achartengine.ChartFactory;
import org.achartengine.GraphicalView;
import org.achartengine.chart.BarChart.Type;
import org.achartengine.chart.PointStyle;
import org.achartengine.model.XYMultipleSeriesDataset;
import org.achartengine.model.XYSeries;
import org.achartengine.renderer.XYMultipleSeriesRenderer;
import org.achartengine.renderer.XYSeriesRenderer;
import android.app.Activity;
//import android.database.Cursor;
//import android.database.sqlite.SQLiteDatabase;
import android.graphics.Color;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.Menu;
import android.widget.LinearLayout;
// http://cariprogram.blogspot.com
// nuramijaya@gmail.com
public class MainActivity extends Activity {
// protected Cursor cursor;
// SQLHelper dbHelper;
private GraphicalView mChart;
private XYSeries visitsSeries ;
private XYMultipleSeriesDataset dataset;
private XYSeriesRenderer visitsRenderer;
private XYMultipleSeriesRenderer multiRenderer;
public double[] arrnilai = {18,16,13,12,10};
public String[] arrurutan = {"1", "2", "3", "4", "5"}; //"14/4", "18/4", "24/4", "30/4", "7/5"};
public String[] arrlabel = {"ASII", "TLKM", "UNVR", "UNTR", "AALI"};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
/* dbHelper = new SQLHelper(this);
SQLiteDatabase db = dbHelper.getReadableDatabase();
cursor = db.rawQuery("SELECT * FROM histori WHERE id_member = '" + MainActivity.idlogin + "' ORDER BY id_histori ASC",null);
arrlemak = new double[cursor.getCount()];
arrurutan = new String[cursor.getCount()];
arrtgl = new String[cursor.getCount()];
cursor.moveToFirst();
for (int cc=0; cc < cursor.getCount(); cc++)
{
cursor.moveToPosition(cc);
arrlemak[cc] = Double.parseDouble(cursor.getString(2).toString());
arrurutan[cc] = String.valueOf(cc+1);
arrtgl[cc] = cursor.getString(4).toString();
}
*/
// Setting up chart
setupChart();
// Start plotting chart
new ChartTask().execute();
}
private void setupChart(){
// Creating an XYSeries for Visits
visitsSeries = new XYSeries("% kenaikan harga saham");
// Creating a dataset to hold each series
dataset = new XYMultipleSeriesDataset();
// Adding Visits Series to the dataset
dataset.addSeries(visitsSeries);
// Creating XYSeriesRenderer to customize visitsSeries
visitsRenderer = new XYSeriesRenderer();
visitsRenderer.setColor(Color.rgb(255, 0, 255));
visitsRenderer.setPointStyle(PointStyle.CIRCLE);
visitsRenderer.setFillPoints(true);
visitsRenderer.setLineWidth(2);
visitsRenderer.setDisplayChartValues(true);
// Creating a XYMultipleSeriesRenderer to customize the whole chart
multiRenderer = new XYMultipleSeriesRenderer();
multiRenderer.setChartTitle("% kenaikan harga saham");
multiRenderer.setXTitle("kode saham");
multiRenderer.setYTitle("kenaikan harga");
multiRenderer.setZoomButtonsVisible(true);
multiRenderer.setXLabels(0);
multiRenderer.setXAxisMin(0);
multiRenderer.setXAxisMax(5);
multiRenderer.setYAxisMin(0);
multiRenderer.setYAxisMax(40);
multiRenderer.setBarSpacing(2);
// Adding visitsRenderer to multipleRenderer
// Note: The order of adding dataseries to dataset and renderers to multipleRenderer
// should be same
multiRenderer.addSeriesRenderer(visitsRenderer);
// Getting a reference to LinearLayout of the MainActivity Layout
LinearLayout chartContainer = (LinearLayout) findViewById(R.id.chart_container);
mChart = (GraphicalView) ChartFactory.getBarChartView(getBaseContext(), dataset, multiRenderer, Type.DEFAULT);
// Adding the Line Chart to the LinearLayout
chartContainer.addView(mChart);
}
private class ChartTask extends AsyncTask<Void, String, Void>{
// Generates dummy data in a non-ui thread
@Override
protected Void doInBackground(Void... params) {
int i = 0;
try{
do{
String [] values = new String[3];
Random r = new Random();
int visits = r.nextInt(10);
values[0] = arrurutan[i]; // Integer.toString(i);
values[1] = String.valueOf(arrnilai[i]); //Integer.toString(visits);
values[2] = arrlabel[i];
publishProgress(values);
Thread.sleep(750);
i++;
}while(i<=4);
}catch(Exception e){ }
return null;
}
// Plotting generated data in the graph
@Override
protected void onProgressUpdate(String... values) {
visitsSeries.add(Double.parseDouble(values[0]), Double.parseDouble(values[1]));
multiRenderer.addXTextLabel(Double.parseDouble(values[0]), arrlabel[Integer.parseInt(values[0])-1]);
mChart.repaint();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
}
Buat layout tampilan di activity_main.xml sebagai berikut :
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<TextView
android:id="@+id/tv_title"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center_horizontal"
android:text="Android Chart" />
<LinearLayout
android:id="@+id/chart_container"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/tv_title" >
</LinearLayout>
</RelativeLayout>
Untuk AndroidManifest.xml tidak perlu dirubah atau ditambah :
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.androidchart"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="16" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.androidchart.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
Hasilnya :
Project selengkapnya download disini. Jika ada yang kesulitan ini cara downloadnya
Semoga berguna :)
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No Wa/Telepon (puat) : 085267792168
No Wa/Telepon (fajar) : 085369237896
Email: Fajarudinsidik@gmail.com
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