我正在尝试制作一个Android应用程序来绘制图形，该图形使用Arduino通过蓝牙使用HC-06模块通过MPAndroid图表库通过蓝牙发送的值来绘制。我进行了两项活动，一项是连接到HC-06模块，另一项是绘制图表。活动一包括用于打开和关闭蓝牙，启用发现功能，发现设备，与设备配对的按钮，以及用于进入第二项活动的按钮（包括图形）。所有这些功能均正常运行。我想知道如何在第二个活动中使用通过蓝牙接收的数据绘制图形。我知道如何使用MPAndroid图表库绘制带有随机点的图形，但对如何处理我的情况一无所知。下面给出的是第二个活动的代码，该代码绘制带有随机点的图形。我尝试从Android蓝牙文档向该代码中添加一些代码，并且这些代码也包含在以下代码中，也许我添加的内容是错误的，因此，对此代码的任何建议都将受到高度赞赏。 （我想我无法理解的是如何访问通过蓝牙接收的数据）对此将提供任何帮助。
public class BluetoothGraph extends AppCompatActivity {
//BluetoothAdapter mBluetoothAdapter;
public ConstraintLayout blgr;
private LineChart mChart;
private static final String TAG = "MY_APP_DEBUG_TAG";
private Handler mHandler; // handler that gets info from Bluetooth service
private interface MessageConstants {
public static final int MESSAGE_READ = 0;
public static final int MESSAGE_WRITE = 1;
public static final int MESSAGE_TOAST = 2;
// ... (Add other message types here as needed.)
}
// private class ConnectedThread extends Thread {
private final BluetoothSocket mmSocket;
private final InputStream mmInStream;
private final OutputStream mmOutStream;
private byte[] mmBuffer; // mmBuffer store for the stream
// public ConnectedThread(BluetoothSocket socket) {
public BluetoothGraph(BluetoothSocket socket) {
mmSocket = socket;
InputStream tmpIn = null;
OutputStream tmpOut = null;
// Get the input and output streams; using temp objects because
// member streams are final.
try {
tmpIn = socket.getInputStream();
} catch (IOException e) {
Log.e(TAG, "Error occurred when creating input stream", e);
}
try {
tmpOut = socket.getOutputStream();
} catch (IOException e) {
Log.e(TAG, "Error occurred when creating output stream", e);
}
mmInStream = tmpIn;
mmOutStream = tmpOut;
}
public void run() {
mmBuffer = new byte[1024];
int numBytes; // bytes returned from read()
// Keep listening to the InputStream until an exception occurs.
while (true) {
try {
// Read from the InputStream.
numBytes = mmInStream.read(mmBuffer);
// Send the obtained bytes to the UI activity.
Message readMsg = mHandler.obtainMessage(MessageConstants.MESSAGE_READ, numBytes, -1, mmBuffer);
readMsg.sendToTarget();
} catch (IOException e) {
Log.d(TAG, "Input stream was disconnected", e);
break;
}
}
}
// Call this method from the main activity to shut down the connection.
public void cancel() {
try {
mmSocket.close();
} catch (IOException e) {
Log.e(TAG, "Could not close the connect socket", e);
}
}
// }
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Intent next = getIntent();
setContentView(R.layout.activity_bluetooth_graph);
blgr = (ConstraintLayout) findViewById(R.id.blGr);
//create line Chart
mChart = new LineChart(this);
//add to mainLayout
blgr.addView(mChart, new AbsListView.LayoutParams(AbsListView.LayoutParams.MATCH_PARENT, AbsListView.LayoutParams.MATCH_PARENT));
//customize line chart this requires earlier version of the library
mChart.setDescription("");
mChart.setNoDataTextDescription("No Data at the moment");
//enable value highlighting
//Set this to true on your Chart to allow highlighting per dragging over the chart surface when it is fully zoomed out. Default: true
mChart.setHighlightPerDragEnabled(true);
// enable touch gestures
//Allows to enable/disable all possible touch-interactions with the chart.
mChart.setTouchEnabled(true);
// Enables/disables dragging (panning) for the chart
mChart.setDragEnabled(true);
// Enables/disables scaling for the chart on both axes.
mChart.setScaleEnabled(true);
// enough to disable grid lines
mChart.setDrawGridBackground(false);
//If set to true, pinch-zooming is enabled. If disabled, x- and y-axis can be zoomed separately.
mChart.setPinchZoom(true);
//alternative BackgroundColor //LTGRAY
mChart.setBackgroundColor(Color.WHITE);
//working on data
LineData dat1 = new LineData();
dat1.setValueTextColor(Color.WHITE);
//add data to line chart
mChart.setData(dat1);
//get Legend object
//By default, all chart types support legends and will automatically
// generate and draw a legend after setting data for the chart. The Legend usually consists of
// multiple entries each represented by a label an a form/shape.
Legend Legend1 = mChart.getLegend();
//customize legend
Legend1.setForm(Legend.LegendForm.LINE);
Legend1.setTextColor(Color.WHITE);
XAxis x1 = mChart.getXAxis();
x1.setTextColor(Color.WHITE);
x1.setDrawGridLines(false);
// if set to true, the chart will avoid that the first and last label entry
// * in the chart "clip" off the edge of the chart
x1.setAvoidFirstLastClipping(true);
YAxis y1 = mChart.getAxisLeft();
y1.setTextColor(Color.WHITE);
y1.setDrawGridLines(true);
y1.setAxisMaxValue(120f);
YAxis y2 = mChart.getAxisRight();
y2.setEnabled(false);
}
@Override
protected void onResume() {
super.onResume();
//
new Thread(new Runnable() {
@Override
public void run() {
// add entries
for (int i = 0; i < 75; i++) {
runOnUiThread(new Runnable() {
@Override
public void run() {
addEntry();
}
});
// pause between adds
try {
Thread.sleep(10);
} catch (InterruptedException e) {
//manage error
}
}
}
}).start();
}
//we need to create method to add entry to the line data
private void addEntry(){
LineData data =mChart.getData();
if (data!=null){
LineDataSet set= (LineDataSet) data.getDataSetByIndex(0);
if(set==null){
//creation if null
set= createSet();
data.addDataSet(set);
}
//add a new random value
data.addXValue("");
data.addEntry(new Entry((float)(Math.random()*125)+5f,set.getEntryCount()),0);
//data.addEntry(new Entry(set.getEntryCount(),0);
//notify chart data have changed
mChart.notifyDataSetChanged();
//limit number of visible entries
mChart.setVisibleXRange(0,100);
//scroll to the last entry
mChart.moveViewToX(data.getXValCount()-7);
}
}
// method to create set
private LineDataSet createSet(){
LineDataSet set=new LineDataSet(null,"spl Db");
set.setDrawCubic(true);
set.getCubicIntensity();
set.setAxisDependency(YAxis.AxisDependency.LEFT);
set.setColor(ColorTemplate.getHoloBlue());
set.setLineWidth(2f);
set.setCircleSize(4f);
set.setFillAlpha(65);
set.setFillColor(ColorTemplate.getHoloBlue());
set.setHighLightColor(Color.rgb(244,177,117));
set.setHighLightColor(Color.WHITE);
set.setValueTextSize(10f);
return set;
}
}