我想要一个应用程序，它向我显示一个文本视图和一个折线图，它使用我从范围传感器接收到的值动态更新。我使用了一个修改后的 TextView 来管理消息并且效果很好。我试图用 AChartEngine 的 GraphicalView 做同样的事情，但图表不会随着新消息的到来而改变。
这是我的代码，有什么建议或建议吗？
public class NxtActivity extends RosActivity{
private XYSeries mCurrentSeries = new XYSeries("range data series");
private XYSeriesRenderer mCurrentRenderer = new XYSeriesRenderer();
private XYMultipleSeriesDataset mDataset = new XYMultipleSeriesDataset();
private XYMultipleSeriesRenderer mRenderer = new XYMultipleSeriesRenderer();
private LineChart linec;
private Canvas canvas = new Canvas();
private RosChartView<std_msgs.String> rdrawview;
private RosTextView<std_msgs.String> rosTextView;
private Android_Talker talker;
private java.net.URI master_uri;
//costruttore
public NxtActivity() {
// The RosActivity constructor configures the notification title and ticker
// messages.
super("Pubsub Tutorial mod", "Pubsub Tutorial mod");
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_nxt);
//setto i parametri del renederer relativo alla singola seria
mCurrentRenderer.setPointStyle(PointStyle.CIRCLE);
mCurrentRenderer.setFillPoints(true);
mCurrentRenderer.setLineWidth(2);
//setto i parametri del renderer globale
mRenderer.addSeriesRenderer(mCurrentRenderer);
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);
mRenderer.setXTitle("time");
mRenderer.setYTitle("ranges");
//setto la serie
mCurrentSeries.add(1,1);
//setto il dataset
mDataset.addSeries(mCurrentSeries);
//setto LineChart
linec = new LineChart(mDataset,mRenderer);
//inizializzo RosChartView
rdrawview=new RosChartView<std_msgs.String>(this,linec,canvas);
rdrawview.setTopicName("chatter_nxt");
rdrawview.setMessageType(std_msgs.String._TYPE);
rdrawview.setMessageToStringCallable(new MessageCallable<String, std_msgs.String>() {
@Override
public String call(std_msgs.String message) {
return message.getData();
}
});
//assegno RosChartView al Layout corrispondente
LinearLayout layout = (LinearLayout) findViewById(R.id.chart);
layout.addView(rdrawview, new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
rdrawview.repaint();
//rdrawview.setup(3,3);
rosTextView = (RosTextView<std_msgs.String>) findViewById(R.id.text1);
rosTextView.setTopicName("chatter_nxt");
rosTextView.setMessageType(std_msgs.String._TYPE);
rosTextView.setMessageToStringCallable(new MessageCallable<String, std_msgs.String>() {
@Override
public String call(std_msgs.String message) {
return message.getData();
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_nxt, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
//case android.R.id.home:
// NavUtils.navigateUpFromSameTask(this);
// return true;
}
return super.onOptionsItemSelected(item);
}
@Override
protected void init(NodeMainExecutor nodeMainExecutor) {
talker = new Android_Talker();
NodeConfiguration nodeConfiguration = NodeConfiguration.newPrivate();
// At this point, the user has already been prompted to either enter the URI
// of a master to use or to start a master locally.
try {
master_uri = new java.net.URI("http://150.145.11.98:11311");
nodeConfiguration.setMasterUri(master_uri);
}
catch(URISyntaxException e){
System.out.println("URI is a malformed URL");
}
rdrawview.setup(3,3);
nodeConfiguration.setMasterUri(master_uri);
nodeMainExecutor.execute(talker, nodeConfiguration);
// The RosTextView is also a NodeMain that must be executed in order to
// start displaying incoming messages.
nodeMainExecutor.execute(rosTextView, nodeConfiguration);
nodeMainExecutor.execute(rdrawview, nodeConfiguration);
}
}
修改后的文本视图：
public class RosTextView<T> extends TextView implements NodeMain {
private String topicName;
private String messageType;
private int count=0;
private MessageCallable<String, T> callable;
public RosTextView(Context context) {
super(context);
}
public RosTextView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public RosTextView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
public void setTopicName(String topicName) {
this.topicName = topicName;
}
public void setMessageType(String messageType) {
this.messageType = messageType;
}
public void setMessageToStringCallable(MessageCallable<String, T> callable) {
this.callable = callable;
}
@Override
public GraphName getDefaultNodeName() {
return GraphName.of("android_gingerbread/ros_text_view");
}
@Override
public void onStart(ConnectedNode connectedNode) {
Subscriber<T> subscriber = connectedNode.newSubscriber(topicName, messageType);
subscriber.addMessageListener(new MessageListener<T>() {
@Override
public void onNewMessage(final T message) {
if (callable != null) {
post(new Runnable() {
@Override
public void run() {
setText(callable.call(message));
count++;
if((count%2)==0){setTextColor(Color.RED);}
else{setTextColor(Color.BLUE);}
}
});
} else {
post(new Runnable() {
@Override
public void run() {
setText(message.toString());
}
});
}
postInvalidate();
}
});
}
@Override
public void onShutdown(Node node) {
}
@Override
public void onShutdownComplete(Node node) {
}
@Override
public void onError(Node node, Throwable throwable) {
}
}
修改后的图形视图：
public class RosChartView<T> extends GraphicalView implements NodeMain {
//---------
private XYMultipleSeriesDataset mDataset = new XYMultipleSeriesDataset();
private XYMultipleSeriesRenderer mRenderer = new XYMultipleSeriesRenderer();
private XYSeries mCurrentSeries = new XYSeries("range data series");
private int x;
private int y;
Context context;
Canvas canvas;
//---------
private String topicName;
private String messageType;
private int count=0;
private MessageCallable<String, T> callable;
public RosChartView(Context context, LineChart xyc, Canvas canvas_) {
super(context,xyc);
this.context=context;
mDataset = xyc.getDataset();
mRenderer = xyc.getRenderer();
mRenderer.setClickEnabled(true);
mRenderer.setSelectableBuffer(100);
x=0;
y=0;
canvas=canvas_;
}
public RosChartView(Context context, AttributeSet attrs, LineChart xyc) {
super(context, xyc);
mDataset = xyc.getDataset();
mRenderer = xyc.getRenderer();
mRenderer.setClickEnabled(true);
mRenderer.setSelectableBuffer(100);
x=0;
y=0;
}
public RosChartView(Context context, AttributeSet attrs, int defStyle, LineChart xyc) {
super(context, xyc);
mDataset = xyc.getDataset();
mRenderer = xyc.getRenderer();
mRenderer.setClickEnabled(true);
mRenderer.setSelectableBuffer(100);
x=0;
y=0;
}
public void setTopicName(String topicName) {
this.topicName = topicName;
}
public void setMessageType(String messageType) {
this.messageType = messageType;
}
public void setMessageToStringCallable(MessageCallable<String, T> callable) {
this.callable = callable;
}
@Override
public GraphName getDefaultNodeName() {
return GraphName.of("android_gingerbread/ros_text_view");
}
@Override
public void onStart(ConnectedNode connectedNode) {
Subscriber<T> subscriber = connectedNode.newSubscriber(topicName, messageType);
subscriber.addMessageListener(new MessageListener<T>() {
@Override
public void onNewMessage(final T message) {
if (callable != null) {
post(new Runnable() {
@Override
public void run() {
count++;
x=count;
y=Integer.parseInt(callable.call(message));
XYSeries series=new XYSeries("new_series");
series=mCurrentSeries;
series.add(2,2);
mDataset.removeSeries(mCurrentSeries);
mCurrentSeries=series;
mDataset.addSeries(mCurrentSeries);
repaint();
}
});
} else {
post(new Runnable() {
@Override
public void run() {
count++;
x=count;
y=Integer.parseInt(message.toString());
mCurrentSeries.add(x,y);
}
});
}
postInvalidate();
}
});
}
@Override
public void onShutdown(Node node) {
}
@Override
public void onShutdownComplete(Node node) {
}
@Override
public void onError(Node node, Throwable throwable) {
}
public void setup(double x,double y)
{
mCurrentSeries.add(x,y);
this.repaint();
}
}
布局
<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" >
<org.ros.android.view.RosTextView
android:id="@+id/text1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="30dip"
/>
<LinearLayout
android:id="@+id/chart"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:layout_below="@id/text1"
android:orientation="horizontal" />
</RelativeLayout>