package com.lingrui.btprint;
import android.app.AlertDialog;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.Toast;
import androidx.activity.EdgeToEdge;
import androidx.activity.result.ActivityResult;
import androidx.activity.result.ActivityResultCallback;
import androidx.activity.result.ActivityResultLauncher;
import androidx.activity.result.contract.ActivityResultContracts;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Set;
import java.util.UUID;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
public static String MY_UUID="";
/**
* 代表本地蓝牙适配器（蓝牙无线电）。BluetoothAdapter是所有蓝牙交互的入口。
* 使用这个你可以发现其他蓝牙设备，查询已配对的设备列表，
* 使用一个已知的MAC地址来实例化一个BluetoothDevice，
* 以及创建一个BluetoothServerSocket来为监听与其他设备的通信。
*/
private BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
/**
* 代表一个远程蓝牙设备，使用这个来请求一个与远程设备的BluetoothSocket连接，
* 或者查询关于设备名称、地址、类和连接状态等设备信息。
*/
private BluetoothDevice mBluetoothDevice = null;
/**
* 代表一个蓝牙socket的接口（和TCP Socket类似）。这是一个连接点，
* 它允许一个应用与其他蓝牙设备通过InputStream和OutputStream交换数据。
*/
private BluetoothSocket mBluetoothSocket = null;
BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
public ActivityResultLauncher<Intent> register;
public void MyClick(View v){
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
EdgeToEdge.enable(this);
setContentView(R.layout.activity_main);
//点击蓝牙按钮
Button btBlt = findViewById(R.id.bt_blt);
btBlt.setOnClickListener(this);
CheckBox ck_1= findViewById(R.id.ck_1);
register = registerForActivityResult(new ActivityResultContracts.StartActivityForResult(), new ActivityResultCallback<ActivityResult>() {
@Override
public void onActivityResult(ActivityResult o) {
int s = o.getResultCode();
if (o == null) {
Log.e("error:", "打开失败");
} else {
if (o.getResultCode() == RESULT_CANCELED) {
Log.d("debug", "用户取消");
}
if (o.getResultCode() == RESULT_OK) {
Log.d("debug", "蓝牙打开成功");
}
}
}
});
}
/* BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
// 如果设备不支持蓝牙
if (bluetoothAdapter == null)
{
Toast.makeText(getApplicationContext(), "该机型不支技蓝牙", Toast.LENGTH_SHORT).show();
return;
}
// 设备支持蓝牙功能，启动蓝牙
if (!bluetoothAdapter.isEnabled())
{
startBlueTooth.launch(new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE));
Toast.makeText(getApplicationContext(), "开启蓝牙", Toast.LENGTH_SHORT).show();
}*/
@Override
public void onClick(View v) {
Toast.makeText(getApplicationContext(), "蓝牙TEST", Toast.LENGTH_SHORT).show();
try {
Log.d("debug", "点击打开蓝牙按钮");
BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
Log.d("debug", "22222222222");
// 如果设备不支持蓝牙
if (bluetoothAdapter == null) {
Log.d("debug", "设备不支持蓝牙");
return;
}
Log.d("debug", "3333333333");
// 设备支持蓝牙功能，启动蓝牙
if (!bluetoothAdapter.isEnabled()) {
register.launch(new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE));
Log.d("debug", "启动蓝牙");
}
Log.d("debug", "44444444444");
//取得蓝牙开启状态
//一旦蓝牙已经打开，我们可以使用蓝牙适配器来搜索附近的蓝牙设备
String tmp = String.valueOf(PackageManager.PERMISSION_GRANTED);
Log.d("debug", tmp);
Log.d("debug", "5111111");
tmp = String.valueOf(android.Manifest.permission.BLUETOOTH_CONNECT);
Log.d("debug", tmp);
tmp= String.valueOf((ActivityCompat.checkSelfPermission(this, android.Manifest.permission.BLUETOOTH_CONNECT)));
Log.d("debug", tmp);
if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.BLUETOOTH_CONNECT) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
Log.d("debug", "5555555555555");
return;
}
Set<BluetoothDevice> pairedDevices = bluetoothAdapter.getBondedDevices();
//getBondedDevices 方法返回已经配对的蓝牙设备的集合。通过遍历集合，可以获取设备的名称和地址等信息
for (BluetoothDevice device : pairedDevices) {
String deviceName = device.getName();
String deviceAddress = device.getAddress();
// 处理找到的设备信息
Log.d("debug", deviceName);
Log.d("debug", deviceAddress);
mBluetoothDevice = device;
}
/*步骤四：连接蓝牙设备
在搜索到蓝牙设备后，我们需要选择一个设备进行连接*/
BluetoothSocket socket = mBluetoothDevice.createRfcommSocketToServiceRecord(UUID.fromString(MY_UUID));
socket.connect();
//连接成功后，我们可以通过蓝牙连接发送打印指令给蓝牙标签打印机。
OutputStream outputStream = socket.getOutputStream();
}catch (IllegalStateException | IOException e) {
Log.d("debug", e.getMessage());
Toast.makeText(getApplicationContext(), "蓝牙打开失败："+"\n"+e.getMessage(), Toast.LENGTH_SHORT).show();
}
}
public void showPermissionDialog() {
AlertDialog.Builder builder = new AlertDialog.Builder(this, android.R.style.Theme_DeviceDefault_Light_Dialog_NoActionBar_MinWidth);
builder.setMessage("需要读SD卡权限，用来获取照片\n需要获取手机状态权限，用来获取设备号\n需要获取联系人权限，用来...");
builder.setTitle("权限说明");
builder.setCancelable(true);
builder.setPositiveButton("申请", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
;
}
});
builder.show();
}
}
标签：Log,BluetoothAdapter,蓝牙,debug,力所,andorid,import,android From： https://www.cnblogs.com/lrzy/p/18143201