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=""; /** * 代表本地藍芽介面卡（藍芽無線電）。BluetoothAdapter是所有藍芽互動的入口。 * 使用這個你可以發現其他藍芽裝置，查詢已配對的裝置列表， * 使用一個已知的MAC地址來例項化一個BluetoothDevice， * 以及建立一個BluetoothServerSocket來為監聽與其他裝置的通訊。 */ private BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); /** * 代表一個遠端藍芽裝置，使用這個來請求一個與遠端裝置的BluetoothSocket連線， * 或者查詢關於裝置名稱、地址、類和連線狀態等裝置資訊。 */ private BluetoothDevice mBluetoothDevice = null; /** * 代表一個藍芽socket的介面（和TCP Socket類似）。這是一個連線點， * 它允許一個應用與其他藍芽裝置透過InputStream和OutputStream交換資料。 */ 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); //點選藍芽按鈕 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:", "開啟失敗"); } else { if (o.getResultCode() == RESULT_CANCELED) { Log.d("debug", "使用者取消"); } if (o.getResultCode() == RESULT_OK) { Log.d("debug", "藍芽開啟成功"); } } } }); } /* BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); // 如果裝置不支援藍芽 if (bluetoothAdapter == null) { Toast.makeText(getApplicationContext(), "該機型不支技藍芽", Toast.LENGTH_SHORT).show(); return; } // 裝置支援藍芽功能，啟動藍芽 if (!bluetoothAdapter.isEnabled()) { startBlueTooth.launch(new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE)); Toast.makeText(getApplicationContext(), "開啟藍芽", Toast.LENGTH_SHORT).show(); }*/ @Override public void onClick(View v) { Toast.makeText(getApplicationContext(), "藍芽TEST", Toast.LENGTH_SHORT).show(); try { Log.d("debug", "點選開啟藍芽按鈕"); BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); Log.d("debug", "22222222222"); // 如果裝置不支援藍芽 if (bluetoothAdapter == null) { Log.d("debug", "裝置不支援藍芽"); return; } Log.d("debug", "3333333333"); // 裝置支援藍芽功能，啟動藍芽 if (!bluetoothAdapter.isEnabled()) { register.launch(new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE)); Log.d("debug", "啟動藍芽"); } Log.d("debug", "44444444444"); //取得藍芽開啟狀態 //一旦藍芽已經開啟，我們可以使用藍芽介面卡來搜尋附近的藍芽裝置 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 方法返回已經配對的藍芽裝置的集合。透過遍歷集合，可以獲取裝置的名稱和地址等資訊 for (BluetoothDevice device : pairedDevices) { String deviceName = device.getName(); String deviceAddress = device.getAddress(); // 處理找到的裝置資訊 Log.d("debug", deviceName); Log.d("debug", deviceAddress); mBluetoothDevice = device; } /*步驟四：連線藍芽裝置 在搜尋到藍芽裝置後，我們需要選擇一個裝置進行連線*/ BluetoothSocket socket = mBluetoothDevice.createRfcommSocketToServiceRecord(UUID.fromString(MY_UUID)); socket.connect(); //連線成功後，我們可以透過藍芽連線傳送列印指令給藍芽標籤印表機。 OutputStream outputStream = socket.getOutputStream(); }catch (IllegalStateException | IOException e) { Log.d("debug", e.getMessage()); Toast.makeText(getApplicationContext(), "藍芽開啟失敗："+"\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("需要讀SD卡許可權，用來獲取照片\n需要獲取手機狀態許可權，用來獲取裝置號\n需要獲取聯絡人許可權，用來..."); builder.setTitle("許可權說明"); builder.setCancelable(true); builder.setPositiveButton("申請", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { ; } }); builder.show(); } }