课程设计单片机和安卓手机进行蓝牙通信,发送电压数据到手机,恰好每次8位数据(1字节)传给上位机。采用以下代码获得16进制字符输出,以下是蓝牙通信接收并显示数据部分代码- case Constants.MESSAGE_READ:
- // construct a string from the valid bytes in the buffer
- byte[] readBuf = (byte[]) msg.obj;
- String readMessage = new String(readBuf, 0, msg.arg1);
- mConversationArrayAdapter.add(mConnectedDeviceName + ": " + readMessage);
- break;
复制代码 我想将字节数组数据转换为十进制,做进一步计算,计算结果以十进制打印输出。代码如下:
- case Constants.MESSAGE_READ:
- if (!msg.obj.equals(null)) {
- byte[] readBuf = (byte[]) msg.obj;
- for (int i = 0; i < readBuf.length; i++) {
- int[] a = new int[readBuf.length];
- a[i] = readBuf[i] * 5000 / 255;
- mConversationArrayAdapter.add(mConnectedDeviceName + ": ");
- System.out.print(a[i]);
- }
- }
- break;
复制代码
上面的第二段代码编译无错误,但在手机上执行后只显示mConnectedDeviceName 和": ",a输出为空白!
调试显示以下error:com.example.android.bluetoothchat E/dalvikvm: Could not find class 'android.support.v4.app.ActivityCompat$SharedElementCallback23Impl',
第一次接触JAVA编程,还请多多指教! |