Question

public void bytesToHex(byte[] in) {
    final StringBuilder builder = new StringBuilder();
    int count=0;
    final int BATCHSIZE=20;
    sendingData = true;
    Log.d("byteToHex", "sendingData = true, start sending data.");
    sendSerial("w"); //write command
    Log.d("byteToHex", "sending w");
    for(byte b : in) {
        //mBluetoothGatt.setCharacteristicNotification(characteristicRX, enabled);
        //byte[] a = mBluetoothGatt.readCharacteristic(characteristicRX);
        while(!newData){
            if(resendData == true){//resends previously sent string
                sendSerial(sendByte);
                Log.d("byteToHex", "resendData = true, resending: " + sendByte);
                resendData = false; //reset resendData flag
            }
        } //wait for next w from mcu

        builder.append(String.format("%02x", b));

        if(builder.length()== BATCHSIZE ){
            sendByte= builder.toString();


            sendSerial(sendByte);
            newData = false;

            Log.d("byteToHex", "newData = false");

            count+=BATCHSIZE;
            Log.d("byteToHex", "Sent " + count/2 + " bytes");
            textViewFileProgress.setText(count/2 + "/" + fileLength); //<- THIS SETTEXT DOES NOT WORK
            builder.setLength(0); //reset the string builder
        }



    } //for(byte b : in)

    //send remaining bytes
    sendByte= builder.toString();
    sendSerial(sendByte);
    newData = false;
    Log.d("byteToHex", "newData = false");
    count+=builder.length();
    Log.d("byteToHex", "Sent " + count/2 + " byte");
    textViewFileProgress.setText(count/2 + "/" + fileLength);//<- THIS SETTEXT WORKS
    builder.setLength(0); //reset the string builder


    sentTerminator = true; //flag to tell BLE service to check if terminator is received on mcu
    sendSerial("||"); //terminating command, tell teensy last hex has been sent
    while(sentTerminator == true){ //while terminator not yet received
        if(resendTerminator == true){ //
            sendSerial("||");
            Log.d("byteToHex", "resending terminator");
            resendTerminator = false; //Resend complete. reset resendTerminator flag.
        }
    }
    sendingData = false;
    //return builder.toString();
}//public void bytesToHex(byte[] in)

我正在尝试将文本设置为textview以显示当前发送的字节数。

不知何故，我的函数中有2个完全相同的setText代码。 textViewFileProgress.setText(count/2 + "/" + fileLength);

其中一个在for循环中，这不起作用。

另一个在for循环之外，这是有效的。

我确信该程序运行了该代码，因为我能够在Android监视器中看到它之前的调试消息。

知道这是什么问题吗？

Answer 1

试试这个。

Log.e("TAG",builder.length()+"");
if(builder.length()== BATCHSIZE ){
        sendByte= builder.toString();

        sendSerial(sendByte);
        newData = false;
        Log.d("byteToHex", "newData = false");

        count+=BATCHSIZE;
        Log.d("byteToHex", "Sent " + count/2 + " bytes");
        textViewFileProgress.setText(count/2 + "/" + fileLength); //<- THIS SETTEXT DOES NOT WORK
        builder.setLength(0); //reset the string builder
} else {
        Log.e("TAG","length != 20");
}

您可以看到Logcat信息

Answer 2

考虑这个简单的代码。您在另一个后台线程中实现for循环，然后使用onPostExecute()在主线程中设置文本请注意，onPostExecute()在主线程中运行而doInBackground()在后台线程中运行，因此您无法在doInBackground()

中设置文本

public void outSideFunction()
{
  //pass a string to doInBackground()
  new TextSetterTask.execute("");


}
//implement an inner class
private class TextSetterTask extends AsyncTask<String,Void,String>
{
   @Override
   protected String doInBackground(String... params)
   {
     //loop
      return //the string you want to set the text
     //if the background thread is done it will call the onPostExecute
   }
   @Override
   protected void onPostExecute(String result)
   {
     //set the text
   }



}

TextView.setText不在for循环中工作

2 个答案: