Android藍牙----打開,關閉操作

① 我們先在AndroidManifest里面增加我們的Bluetooth權限

<uses-permission android:name="android.permission.BLUETOOTH"/>  //使用藍牙所需要的權限
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/> //使用掃描和設置藍牙的權限（申明這一個權限必須申明上面一個權限）

② 寫個簡單的布局文件

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.administrator.bluetoothdemo.MainActivity">


    <Button
        android:id="@+id/Btn1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="53dp"
        android:text="open Bluetooth"
        android:textAllCaps="false"
        />
    <Button
        android:id="@+id/Btn2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="100dp"
        android:text="clase Bluetooth"
        android:textAllCaps="false"
        />
</RelativeLayout>

③ 接下來寫MainActivity類的代碼

package com.example.administrator.bluetoothdemo;

import android.bluetooth.BluetoothAdapter;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    private Button mBtn,mBtn1;
    private BluetoothAdapter mBluetooth;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        findView();   //查找控件
        mBtn.setOnClickListener(this);  //創建點擊事件
        mBtn1.setOnClickListener(this);
    }
    public void onClick(View v)
    {
        switch(v.getId())
        {
            case R.id.Btn1:
            {
                if(!mBluetooth.isEnabled())
                {
                        mBluetooth.enable();
                }
                Toast.makeText(MainActivity.this,"打開成功", Toast.LENGTH_SHORT).show();
            }break;

            case R.id.Btn2:
            {
                if(mBluetooth.isEnabled())
                {
                        mBluetooth.disable();
                }
                Toast.makeText(MainActivity.this,"關閉成功", Toast.LENGTH_SHORT).show();
            }break;
        }
    }
    public void findView()
    {
                mBtn = (Button)findViewById(R.id.Btn1);
                mBtn1 = (Button) findViewById(R.id.Btn2);
                mBluetooth = BluetoothAdapter.getDefaultAdapter(); //獲取Bluetooth適配器
    }
}