如何检查蓝牙是否以编程方式启用？

I would like to check if bluetooth is enabled on any Android device periodically. Is there any intents that I could catch using BroadcastReceiver to do so, or is there other ways to do it?

我想检查是否在任何Android设备上定期启用蓝牙。有没有使用BroadcastReceiver可以捕获的意图，还是有其他方法可以做到这一点？

6 个解决方案

#1

130

There you go:

你去：

BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (mBluetoothAdapter == null) {
    // Device does not support Bluetooth
} else {
    if (!mBluetoothAdapter.isEnabled()) {
        // Bluetooth is not enable :)
    }
}

With uses-permission

使用权限

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

#2

Here I have other alternative as an answer for this question.

在这里，我有其他选择作为这个问题的答案。

First add following lines in your Manifest file.

首先在清单文件中添加以下行。

<uses-feature android:name="android.hardware.BLUETOOTH" android:required="false"/>

Now, where you want to check Bluetooth supportability, use following code.

现在，您要检查蓝牙支持性，请使用以下代码。

boolean isBluetoothSupported = getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH);

#3

public boolean isBluetoothEnabled()
    {
        BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
        return mBluetoothAdapter.isEnabled();

    }

with the permission in manifest file:

使用清单文件中的权限：

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

#4

use can use

使用可以使用

BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();

for check bt connected

检查bt连接

mBluetoothAdapter.getProfileConnectionState(BluetoothHeadset.HEADSET) == BluetoothHeadset.STATE_CONNECTED

for check bt disconnected

检查bt断开连接

mBluetoothAdapter.getProfileConnectionState(BluetoothHeadset.HEADSET) == BluetoothHeadset.STATE_DISCONNECTED

#5

To check Bluetooth state, ON or OFF, programmatically:

要以编程方式检查蓝牙状态，ON或OFF：

    BluetoothAdapter btAdapter = ((Build.VERSION.SDK_INT > Build.VERSION_CODES.JELLY_BEAN_MR1)
           ?((BluetoothManager)mContext.getSystemService(Context.BLUETOOTH_SERVICE)).getAdapter()
               :(BluetoothAdapter.getDefaultAdapter()));

       if(btAdapter==null){
        return;
       }
       if(btAdapter.getState()==BluetoothAdapter.STATE_ON){
            //Bluetooth is ON
       }

You may also listen to Intent action:

您也可以收听Intent动作：

BluetoothAdapter.ACTION_STATE_CHANGED

BluetoothAdapter.ACTION_STATE_CHANGED

#6

This is how I did it with the help of @xjaphx's answer, slightly simplified version:

这是我在@ xjaphx的答案，稍微简化的版本的帮助下做到的：

 private boolean getBlueToothOn(){
    BluetoothAdapter btAdapter = BluetoothAdapter.getDefaultAdapter(); 
      return btAdapter != null && btAdapter.isEnabled();
    }

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

#1

130