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POachartengine : how to repaint / redraw chart
 

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  1. POachartengine : how to repaint / redraw chart
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    <p>i want to repaint my chart everytime i choose one of m adapter, The first time is the graph is drawn looks perfect, but when I go to the choose one and come back looks like it draws two times the same graph.</p> <p>this is my source code :</p> <pre><code> public class MainActivity extends Activity { private Button btnConnect; private Spinner spnTime; private String[] durationData = new String[]{ "Pilih Durasi", "1 Minggu", "1 Bulan", "3 Bulan", "9 Bulan", "12 Bulan" }; int period = 0; private LinearLayout lnChart; private ProgressDialog dialog; public String baseURL = "http://www.abcj.com/i="; private ArrayList&lt;DataItem&gt; listData; //CHART VARIABLES public static final String TYPE = "type"; private XYMultipleSeriesDataset mDataset = new XYMultipleSeriesDataset(); private XYMultipleSeriesRenderer mRenderer = new XYMultipleSeriesRenderer(); private XYSeries mCurrentSeries; private XYSeriesRenderer mCurrentRenderer; private String mDateFormat; private GraphicalView mChartView; private int index = 0; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); btnConnect = (Button)findViewById(R.id.btnDownloadChartData); spnTime = (Spinner)findViewById(R.id.spOptDuration); listData = new ArrayList&lt;DataItem&gt;(); //CHART INITIATION mRenderer.setApplyBackgroundColor(true); mRenderer.setBackgroundColor(Color.argb(100, 50, 50, 50)); mRenderer.setAxisTitleTextSize(16); mRenderer.setChartTitleTextSize(20); mRenderer.setLabelsTextSize(15); mRenderer.setLegendTextSize(15); mRenderer.setMargins(new int[] { 20, 30, 15, 0 }); mRenderer.setZoomButtonsVisible(true); mRenderer.setPointSize(10); btnConnect.setOnClickListener(new OnClickListener() { @Override public void onClick(View arg0) { // TODO Auto-generated method stub ArrayAdapter&lt;String&gt; adapter = new ArrayAdapter&lt;String&gt;(MainActivity.this, android.R.layout.simple_dropdown_item_1line, durationData); spnTime.setAdapter(adapter); spnTime.setOnItemSelectedListener(new OnItemSelectedListener() { @Override public void onItemSelected(AdapterView&lt;?&gt; arg0, View arg1, int arg2, long arg3) { // TODO Auto-generated method stub switch (arg2+1) { case 0: break; case 1: period = 7; break; case 2: period = 30; break; case 3: period = 90; break; case 4: period = 180; break; case 5: period = 360; break; default: break; } new LoadData(baseURL+period).execute(); } @Override public void onNothingSelected(AdapterView&lt;?&gt; arg0) { // TODO Auto-generated method stub } }); } }); } @SuppressLint("ShowToast") @Override protected void onResume() { // TODO Auto-generated method stub super.onResume(); if (mChartView == null) { lnChart = (LinearLayout) findViewById(R.id.chart); mChartView = ChartFactory.getLineChartView(this, mDataset, mRenderer); mRenderer.setClickEnabled(true); mRenderer.setSelectableBuffer(100); mChartView.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { SeriesSelection seriesSelection = mChartView.getCurrentSeriesAndPoint(); double[] xy = mChartView.toRealPoint(0); if (seriesSelection == null) { Toast.makeText(MainActivity.this, "No chart element was clicked", Toast.LENGTH_SHORT) .show(); } } }); mChartView.setOnLongClickListener(new View.OnLongClickListener() { @SuppressLint("ShowToast") @Override public boolean onLongClick(View v) { SeriesSelection seriesSelection = mChartView.getCurrentSeriesAndPoint(); if (seriesSelection == null) { Toast.makeText(MainActivity.this, "No chart element was long pressed", Toast.LENGTH_SHORT); return false; // no chart element was long pressed, so let something // else handle the event } else { Toast.makeText(MainActivity.this, "Chart element in series index " + seriesSelection.getSeriesIndex() + " data point index " + seriesSelection.getPointIndex() + " was long pressed", Toast.LENGTH_SHORT); return true; // the element was long pressed - the event has been // handled } } }); mChartView.addZoomListener(new ZoomListener() { public void zoomApplied(ZoomEvent e) { String type = "out"; if (e.isZoomIn()) { type = "in"; } System.out.println("Zoom " + type + " rate " + e.getZoomRate()); } public void zoomReset() { System.out.println("Reset"); } }, true, true); mChartView.addPanListener(new PanListener() { public void panApplied() { System.out.println("New X range=[" + mRenderer.getXAxisMin() + ", " + mRenderer.getXAxisMax() + "], Y range=[" + mRenderer.getYAxisMax() + ", " + mRenderer.getYAxisMax() + "]"); } }); lnChart.removeAllViews(); lnChart.addView(mChartView, new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT)); } else { mChartView.repaint(); } } private class LoadData extends AsyncTask&lt;Void, Void, String&gt;{ String url = ""; public LoadData(String url) { // TODO Auto-generated constructor stub this.url = url; } @Override protected void onPreExecute() { // TODO Auto-generated method stub super.onPreExecute(); dialog = ProgressDialog.show(MainActivity.this, "", "Please wait"); } @Override protected String doInBackground(Void... params) { // TODO Auto-generated method stub String result = ""; try { result = Connection.get(url); } catch (Exception e) { // TODO: handle exception result = ""; Log.d("TEST CHART", e.getMessage()); } return result; } @Override protected void onPostExecute(String result) { // TODO Auto-generated method stub super.onPostExecute(result); fetchResponse(result.replace("\n", "").trim()); dialog.dismiss(); } } private void fetchResponse(String result) { // TODO Auto-generated method stub if (!result.equals("")) { try { JSONArray jsonArray = new JSONArray(result); DataItem item = null; for (int i = 1; i &lt; jsonArray.length(); i++) { JSONObject jsonObject = jsonArray.getJSONObject(i); item = new DataItem(jsonObject.optString("lji_invest"), jsonObject.optDouble("persen_hmin1"), jsonObject.optDouble("lnu_nilai"), jsonObject.optDouble("selisih"), jsonObject.optString("lji_id"), jsonObject.optString("tanggal")); listData.add(item); } renderChart(listData); } catch (Exception e) { Log.d("TEST CHART", e.getMessage()); } } } private void renderChart(ArrayList&lt;DataItem&gt; listData) { // TODO Auto-generated method stub String seriesTitle = "Series Data"; XYSeries series = new XYSeries(seriesTitle); mDataset.addSeries(series); mCurrentSeries = series; XYSeriesRenderer renderer = new XYSeriesRenderer(); mRenderer.addSeriesRenderer(renderer); renderer.setFillPoints(true); mCurrentRenderer = renderer; for (int i = 0; i &lt; listData.size(); i++) { mCurrentSeries.add(listData.get(i).getInuNilai(), listData.get(i).getPersenHmint1()); } if (mChartView != null) { mChartView.repaint(); } } @Override protected void onRestoreInstanceState(Bundle savedState) { super.onRestoreInstanceState(savedState); mDataset = (XYMultipleSeriesDataset) savedState.getSerializable("dataset"); mRenderer = (XYMultipleSeriesRenderer) savedState.getSerializable("renderer"); mCurrentSeries = (XYSeries) savedState.getSerializable("current_series"); mCurrentRenderer = (XYSeriesRenderer) savedState.getSerializable("current_renderer"); mDateFormat = savedState.getString("date_format"); } @Override protected void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); outState.putSerializable("dataset", mDataset); outState.putSerializable("renderer", mRenderer); outState.putSerializable("current_series", mCurrentSeries); outState.putSerializable("current_renderer", mCurrentRenderer); outState.putString("date_format", mDateFormat); } </code></pre> <p>so how to repaint my chart? i hope somebody can show me where is my fault, and tell me the way to fix it</p>
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