Android App Graphview 未在 Run UI Thread 中更新

Question

我正在尝试使用graphview在我的Anroid应用程序上绘制我的实时ADC数据。我正在尝试使用runOnUiThread在单独的线程中绘制数据，但没有在图形上绘制任何内容，并且没有重复调用runOnUiThread。

如何连续运行图形视图？如果我在一段时间内调用runOnUiThread循环，应用程序会挂起。

下面是我的代码

UsbSerialInterface.UsbReadCallback mCallback = new UsbSerialInterface.UsbReadCallback() { //Defining a Callback which triggers whenever data is read.

@Override
public void onReceivedData(byte[] arg0) {
// lowbyte = arg0;
// highbyte = arg0;
byte[] buffer = arg0;
for (int i = 0; i <= (buffer.length - 1); i++) {
if (buffer[i] != 13) {
if (buffer[i] == 10) {
finaldata = rawdata;
rawdata = "";
} else {
chdata = (char) buffer[i];
rawdata += chdata;
}
}
}
data = Integer.parseInt(finaldata);
control_a = 1;
buffer_bt[databuff] = data;
// }
//lowbyte = buffer;
//highbyte = buffer;
databuff = databuff + 1;

if (databuff == 767){
databuff=0;
}           
}
};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
requestWindowFeature(Window.FEATURE_NO_TITLE);//Hide title
this.getWindow().setFlags(WindowManager.LayoutParams.
FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);//Hide Status bar
setContentView(R.layout.activity_main);
//set background color
LinearLayout background = (LinearLayout)findViewById(R.id.bg);
background.setBackgroundColor(Color.BLACK);
mHandler = new Handler();
//GraphView = (LinearLayout) findViewById(R.id.Graph);
usbManager = (UsbManager) getSystemService(this.USB_SERVICE);
connectionstatus = (TextView) findViewById(R.id.tvBluetooth);
bConnect = (Button)findViewById(R.id.bConnect);
bConnect.setOnClickListener(this);
bDisconnect = (Button)findViewById(R.id.bDisconnect);
bDisconnect.setOnClickListener(this);
//X-axis control button
bXminus = (Button)findViewById(R.id.bXminus);
bXminus.setOnClickListener(this);
bXplus = (Button)findViewById(R.id.bXplus);
bXplus.setOnClickListener(this);
//
tbLock = (ToggleButton)findViewById(R.id.tbLock);
tbLock.setOnClickListener(this);
tbScroll = (ToggleButton)findViewById(R.id.tbScroll);
tbScroll.setOnClickListener(this);
tbStream = (ToggleButton)findViewById(R.id.tbStream);
tbStream.setOnClickListener(this);
//init toggleButton
Lock=true;
AutoScrollX=true;
Stream=true;
IntentFilter filter = new IntentFilter();
filter.addAction(ACTION_USB_PERMISSION);
filter.addAction(UsbManager.ACTION_USB_DEVICE_ATTACHED);
filter.addAction(UsbManager.ACTION_USB_DEVICE_DETACHED);
registerReceiver(broadcastReceiver, filter);
init();
Thread thread = new Thread(null, commRunnable, "tag");
thread.start();
}
Runnable commRunnable = new Runnable(){
@Override
public void run() {
plotdata = buffer_bt[i];
i = i + 1;
if (i == 767) {
i = 0;
}

if (tbStream.isChecked()) {
// plot data
runOnUiThread(new Runnable() {
@Override
public void run() {
Series.appendData(new GraphViewData(graph2LastXValue, plotdata), AutoScrollX);
if (graph2LastXValue >= Xview && Lock == true) {
Series.resetData(new GraphViewData[]{});
graph2LastXValue = 0;
} else graph2LastXValue += 0.4;
if (Lock == true)
graphView.setViewPort(0, Xview);
else
graphView.setViewPort(graph2LastXValue - Xview, Xview);
//refresh
GraphView.removeView(graphView);
GraphView.addView(graphView);
}

});
}
}
};

Answer 1

我想我需要一个处理程序将串行数据传递给 UI 线程。但是如何使用它呢？

UsbSerialInterface.UsbReadCallback mCallback = new UsbSerialInterface.UsbReadCallback() { 
//Defining a Callback which triggers whenever data is read.

@Override
public void onReceivedData(byte[] arg0) {
// lowbyte = arg0;
// highbyte = arg0;
byte[] buffer = arg0;
for (int i = 0; i <= (buffer.length - 1); i++) {
if (buffer[i] != 13) {
if (buffer[i] == 10) {
finaldata = rawdata;
rawdata = "";
} else {
chdata = (char) buffer[i];
rawdata += chdata;
}
}
}
data = Integer.parseInt(finaldata);
//I need a handler here. But how to use it in my code?
control_a = 1;
buffer_bt[databuff] = data;
// }
//lowbyte = buffer;
//highbyte = buffer;
databuff = databuff + 1;

if (databuff == 767){
databuff=0;
}           
}
};