我正在开发一个应用程序,首先我必须搜索可用的蓝牙设备并建立连接。我完成了这项任务。在此之后,将打开一个新的Activity,其中有一个Edittext和一个Button。我开发了以下代码。它没有提供任何输出。 我使用连接设备的MAC地址传递数据。
java文件......
import java.io.IOException;
import java.io.OutputStream;
import java.util.UUID;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.ContentValues;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
@SuppressLint("NewApi")
public class NewMessage extends Activity {
Button btn;
EditText et;
String message1="Hello";//on button click by default
BluetoothAdapter mBluetoothAdapter1 = null;;
// BluetoothAdapter mBluetoothAdapter;
public static String MacAddress;
@Override
public void onCreate(Bundle mSavedInstanceState) {
super.onCreate(mSavedInstanceState);
setContentView(R.layout.message);
btn = (Button) findViewById(R.id.btn);
et = (EditText) findViewById(R.id.et);
btn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
mBluetoothAdapter1 = BluetoothAdapter.getDefaultAdapter();
byte[] toSend=message1.getBytes();
try
{
final UUID applicationUUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
BluetoothDevice device=mBluetoothAdapter1.getRemoteDevice(MacAddress);
BluetoothSocket socket=device.createInsecureRfcommSocketToServiceRecord(applicationUUID);
OutputStream mmout=socket.getOutputStream();
mmout.write(toSend);
mmout.flush();
mmout.close();
socket.close();
Toast.makeText(getBaseContext(), MacAddress, 10000).show();
}
catch (IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
}
/*private void sendDataToPairedDevice(String message ,BluetoothDevice device){
byte[] toSend = message.getBytes();
try
{
BluetoothSocket socket = device.createInsecureRfcommSocketToServiceRecord(applicationUUID);
OutputStream mmOutStream = socket.getOutputStream();
mmOutStream.write(toSend);
// Your Data is sent to BT connected paired device ENJOY.
} catch (IOException e) {
e.printStackTrace();
}
}*/
}
xml文件
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<EditText
android:id="@+id/et"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10"
android:hint="@string/hint">
<requestFocus />
</EditText>
<Button
android:id="@+id/btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/send" />
</LinearLayout>
请帮帮我......
这是我的代码,它有问题..
public void onClick(View v) {
// TODO Auto-generated method stub
mBluetoothAdapter1 = BluetoothAdapter.getDefaultAdapter();
byte[] toSend=message1.getBytes();
try
{
final UUID applicationUUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
BluetoothDevice device=mBluetoothAdapter1.getRemoteDevice(MacAddress);
BluetoothSocket socket=device.createInsecureRfcommSocketToServiceRecord(applicationUUID);
OutputStream mmout=socket.getOutputStream();
mmout.write(toSend);
mmout.flush();
mmout.close();
socket.close();
}
catch (IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
答案 0 :(得分:1)
这并不能直接回答您的问题,但我注意到的一件事是10000
作为Toast.makeText()
的持续时间参数,这是无效的。它只接受Toast.LENGTH_SHORT
或Toast.LENGTH_LONG
,实际上只是0或1.检查文档:http://developer.android.com/reference/android/widget/Toast.html
[修改强>]
我在代码中看到的另一个错误是您将空String
传递给getRemoteDevice
。尝试getRemoteDevice("00001101-0000-1000-8000-00805F9B34FB")
,看看会发生什么。再次阅读文档:http://developer.android.com/reference/android/bluetooth/BluetoothAdapter.html#getRemoteDevice(java.lang.String)
答案 1 :(得分:0)
包括连接功能。
BluetoothSocket socket=device.createInsecureRfcommSocketToServiceRecord(applicationUUID);
socket.connect(); // here
OutputStream mmout=socket.getOutputStream();