[Android] 關於藍芽

AndroidManifest.xml

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<manifest …>
    ……………
    ……………
    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
    <uses-permission android:name="android.permission.BLUETOOTH" />
    ……………
    ……………    
</manifest>

AndroidBluetooth.java

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import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.content.Intent;
import android.os.Bundle;

public class Android_Bluetooth extends Activity {
    private static final int REQUEST_ENABLE_BT = 0;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
        if (mBluetoothAdapter != null) {
            if (!mBluetoothAdapter.isEnabled()) {
                Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
                startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
            }
        }
        else{
            tv1.setText("not bluetooth sensor");
        }
        
    }
}

在使用之前要先在 AndroidManifest.xml裡的 manifest 加入這兩行

import android.bluetooth.BluetoothAdapter;

要開啟藍芽前先要引入 BluetoothAdapter

BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();

建立一個新的 BluetoothAdapter 物件以 mBluetoothAdapter 命名

if (mBluetoothAdapter != null) {

}

這個用法是可以去檢查裝置是否有藍芽

if (!mBluetoothAdapter.isEnabled()) {

            Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
            startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);

}

這是用來判斷該裝置的藍芽是否開啟了,開啟傳True 否則 False
如果沒有開啟會跳出訊息畫面，詢問使用者藍芽是開啟

mBluetoothAdapter.enable(); 

也可以直接用直接開啟

String res="";
Set<BluetoothDevice> pairedDevices = mBluetoothAdapter.getBondedDevices();
// If there are paired devices
if (pairedDevices.size() > 0) {
    // Loop through paired devices
    for (BluetoothDevice device : pairedDevices) {
        // Add the name and address to an array adapter to show in a ListView
        res += device.getName() + " " + device.getAddress() +"\n";
    }
}

這段是可以把已經 配對過的手機(名稱、MAC) 都紀錄起來