蓝牙实战(一)

一.概述

在前面的三篇文章讲解蓝牙开发，写的比较详细，篇幅比较长，后面这几篇来点简单实用的，先看效果图

二.代码

代码如下：

BlueToothController 控制蓝牙操作

public class BlueToothController {

    private BluetoothAdapter mAdapter;

    public BlueToothController() {
        mAdapter = BluetoothAdapter.getDefaultAdapter();
    }

    /**
     * 是否支持蓝牙
     * @return true 支持 false 不支持
     */
    public boolean isSupportBlueTooth() {
       if( mAdapter != null ){
           return true;
       }
        else {
           return false;
       }
    }

    /**
     * 获取蓝牙状态
     * @return
     */
    public boolean getBlueToothStatus() {
        assert (mAdapter != null);
        return mAdapter.isEnabled();
    }

    /**
     * 打开蓝牙
     * @param activity
     * @param requestCode
     */
    public void turnOnBlueTooth(Activity activity, int requestCode) {
        Intent intent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
        activity.startActivityForResult(intent, requestCode);
//        mAdapter.enable();
    }

    /**
     * 关闭蓝牙
     */
    public void turnOffBlueTooth() {
        mAdapter.disable();
    }
}

public class MainActivity extends ActionBarActivity {

    public static final int REQUEST_CODE = 0;
    private BlueToothController mController = new BlueToothController();
    private Toast mToast;

    /**
     * 监听蓝牙开关的广播
     */
    private BroadcastReceiver receiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            int state = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE,-1);
            switch (state) {
                case BluetoothAdapter.STATE_OFF:
                    showToast("STATE_OFF");
                    break;
                case BluetoothAdapter.STATE_ON:
                    showToast("STATE_ON");
                    break;
                case BluetoothAdapter.STATE_TURNING_ON:
                    showToast("STATE_TURNING_ON");
                    break;
                case BluetoothAdapter.STATE_TURNING_OFF:
                    showToast("STATE_TURNING_OFF");
                    break;
                default:
                    showToast("Unkown STATE");
                    break;
            }
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        IntentFilter filter = new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED);
        registerReceiver(receiver, filter);
    }

    @Override
    protected void onDestroy() {
        unregisterReceiver(receiver);
        super.onDestroy();
    }

    public void isSupportBlueTooth(View view) {
        boolean ret = mController.isSupportBlueTooth();
        showToast("support Bluetooth? " + ret);
    }

    public void isBlueToothEnable(View view) {
        boolean ret = mController.getBlueToothStatus();
        showToast("Bluetooth enable？" + ret);
    }

    public void requestTurnOnBlueTooth(View view) {
        mController.turnOnBlueTooth(this, REQUEST_CODE);
    }

    public void turnOffBlueTooth(View view) {
        mController.turnOffBlueTooth();
    }

    private void showToast(String text) {
        if( mToast == null) {
            mToast = Toast.makeText(this, text, Toast.LENGTH_SHORT);
        }
        else {
            mToast.setText(text);
        }
        mToast.show();
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        //当发起请求蓝牙打开事件时，会告诉你用户选择的结果
        if( resultCode == RESULT_OK) {
            showToast("打开成功");
        }
        else {
            showToast("打开失败");
        }
    }
}