android蓝牙开发:无法发现蓝牙设备的问题

蓝牙应用搜索不到附近设备的问题困扰了很久.

蓝牙应用需要两个基本权限:

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

而对于发现设备新这个功能, 还需另外两个权限(Android M 以上版本需要显式获取授权,附授权代码):

<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>

@SuppressLint("WrongConstant")
private void getPermission() {
    if (Build.VERSION.SDK_INT > Build.VERSION_CODES.M) {
        int permissionCheck = 0;
        permissionCheck = this.checkSelfPermission(Manifest.permission.ACCESS_FINE_LOCATION);
        permissionCheck += this.checkSelfPermission(Manifest.permission.ACCESS_COARSE_LOCATION);
        if (permissionCheck != PackageManager.PERMISSION_GRANTED) {
            this.requestPermissions( // 请求授权
                    new String[]{Manifest.permission.ACCESS_FINE_LOCATION,
                            Manifest.permission.ACCESS_COARSE_LOCATION},
                    ACCESS_LOCATION);// 自定义常量,任意整型
        } else {
            // 已经获得权限
        }
    }
}

@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
    switch (requestCode) {
        case ACCESS_LOCATION:
            if (hasAllPermissionGranted(grantResults)) {
                Log.d(TAG, "onRequestPermissionsResult: OK");
            } else {
                Log.d(TAG, "onRequestPermissionsResult: NOT OK");
            }
            break;
    }
}

private boolean hasAllPermissionGranted(int[] grantResults) {
    for (int grantResult : grantResults) {
        if (grantResult == PackageManager.PERMISSION_DENIED) {
            return false;
        }
    }
    return true;
}

在初始化方法中调用

getPermission()

方法即可获取授权

完~