我在使用 achartengine 库显示图形时遇到问题。我有两个菜单按钮，比如说A和B按钮。现在，当您单击A菜单按钮时，将显示折线图，当您单击B菜单按钮时，将显示饼图。我面临的问题是，当我再次单击A菜单按钮以显示它没有显示任何图形的行时， B菜单按钮也发生了同样的情况。
这是我的主要活动课程：
import org.achartengine.ChartFactory;
import org.achartengine.GraphicalView;
import org.achartengine.chart.PointStyle;
import org.achartengine.model.CategorySeries;
import org.achartengine.model.SeriesSelection;
import org.achartengine.model.TimeSeries;
import org.achartengine.model.XYMultipleSeriesDataset;
import org.achartengine.renderer.DefaultRenderer;
import org.achartengine.renderer.SimpleSeriesRenderer;
import org.achartengine.renderer.XYMultipleSeriesRenderer;
import org.achartengine.renderer.XYSeriesRenderer;
import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup.LayoutParams;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.Toast;
import com.capricorn.RayMenu;
public class MainActivity extends Activity {
private static final int[] ITEM_DRAWABLES = { R.drawable.ic_1,
R.drawable.ic_2, R.drawable.ic_3, R.drawable.ic_4, R.drawable.ic_5,
R.drawable.ic_6 };
private GraphicalView mChartView;
private GraphicalView pieChartView;
private CategorySeries pieSeries = new CategorySeries("Pie Chart");
private DefaultRenderer pieRenderer = new DefaultRenderer();
private TimeSeries series = new TimeSeries("Line1");
private XYMultipleSeriesDataset dataSet = new XYMultipleSeriesDataset();
private XYMultipleSeriesRenderer multiRenderer = new XYMultipleSeriesRenderer();
private XYSeriesRenderer renderer = new XYSeriesRenderer();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final int itemCount = ITEM_DRAWABLES.length;
RayMenu rayMenu = (RayMenu) findViewById(R.id.ray_menu);
for (int i = 0; i < itemCount; i++) {
ImageView item = new ImageView(this);
item.setImageResource(ITEM_DRAWABLES[i]);
final int position = i;
rayMenu.addItem(item, new OnClickListener() {
@Override
public void onClick(View v) {
action(position);
}
});// Add a menu item
}
}
public void lineGraph() {
int[] X = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
int[] Y = { 30, 34, 45, 57, 77, 89, 100, 111, 123, 145 };
for (int i = 0; i < X.length; i++) {
series.add(X[i], Y[i]);
}
dataSet.addSeries(series);
renderer.setColor(Color.RED);
renderer.setPointStyle(PointStyle.CIRCLE);
renderer.setFillPoints(true);
multiRenderer.setApplyBackgroundColor(true);
multiRenderer.setBackgroundColor(Color.WHITE);
multiRenderer.setMarginsColor(Color.WHITE);
multiRenderer.setAxesColor(Color.BLACK);
multiRenderer.setLabelsTextSize(20);
multiRenderer.setXLabelsColor(Color.BLACK);
multiRenderer.setYLabelsColor(0, Color.BLACK);
multiRenderer.addSeriesRenderer(renderer);
}
public void pieGraph() {
int[] values = { 25, 15, 20, 40 };
int k =0;
for(int value : values){
pieSeries.add("Section" + ++k, value);
}
int[] COLORS = new int[] { Color.GREEN, Color.BLUE,
Color.MAGENTA, Color.CYAN };
for(int colors : COLORS){
SimpleSeriesRenderer simple = new SimpleSeriesRenderer();
simple.setColor(colors);
pieRenderer.addSeriesRenderer(simple);
}
}
public void action(int id) {
LinearLayout layout = (LinearLayout) findViewById(R.id.chart);
if (id == 0) {
layout.removeView(pieChartView);
lineGraph();
if (mChartView == null) {
mChartView = ChartFactory.getLineChartView(this, dataSet,
multiRenderer);
multiRenderer.setClickEnabled(true);
multiRenderer.setSelectableBuffer(10);
mChartView.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
SeriesSelection seriesSelection = mChartView
.getCurrentSeriesAndPoint();
if (seriesSelection == null) {
Toast.makeText(MainActivity.this,
"No chart element", Toast.LENGTH_SHORT)
.show();
} else {
Toast.makeText(
MainActivity.this,
"Chart element in series index "
+ seriesSelection.getSeriesIndex()
+ " data point index "
+ seriesSelection.getPointIndex()
+ " was clicked"
+ " closest point value X="
+ seriesSelection.getXValue()
+ ", Y="
+ seriesSelection.getValue(),
Toast.LENGTH_SHORT).show();
}
}
});
layout.addView(mChartView, new LayoutParams(
LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
} else {
mChartView.repaint();
}
} else if (id == 1) {
layout.removeView(mChartView);
pieGraph();
if (pieChartView == null) {
pieChartView = ChartFactory.getPieChartView(this, pieSeries,
pieRenderer);
pieRenderer.setClickEnabled(true);
pieChartView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
SeriesSelection seriesSelection = pieChartView
.getCurrentSeriesAndPoint();
if (seriesSelection == null) {
Toast.makeText(MainActivity.this,
"No chart element selected",
Toast.LENGTH_SHORT).show();
} else {
for (int i = 0; i < pieSeries.getItemCount(); i++) {
pieRenderer.getSeriesRendererAt(i)
.setHighlighted(
i == seriesSelection
.getPointIndex());
}
Toast.makeText(
MainActivity.this,
"Chart data point index "
+ seriesSelection.getPointIndex()
+ " selected" + " point value="
+ seriesSelection.getValue(),
Toast.LENGTH_SHORT).show();
}
}
});
layout.addView(pieChartView, new LayoutParams(
LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
} else {
pieChartView.repaint();
}
} else if (id == 2) {
} else if (id == 3) {
} else if (id == 4) {
} else if (id == 5) {
}
}
}
正如您从上面的代码中看到的那样，我正在使用 layout.removeView 从布局中删除 GraphicalView 然后我可以在您第一次单击按钮时查看一次，但当您第二次单击按钮时不可见时间。请帮助我，我从过去 2 天开始就面临这个问题。