1.添加监听蓝牙状态变化的广播监听器

app/src/main/java/com/xhly/manageapp/broadcastreceiver/BLEStateReceiver.java

@@ -0,0 +1,70 @@
+package com.xhly.manageapp.broadcastreceiver;
+
+import android.annotation.SuppressLint;
+import android.bluetooth.BluetoothAdapter;
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.util.Log;
+import android.widget.Toast;
+
+public class BLEStateReceiver extends BroadcastReceiver {
+ 
+    private static final String BLE_STATE_OFF = "android.bluetooth.BluetoothAdapter.STATE_OFF";
+    private static final String BLE_STATE_ON = "android.bluetooth.BluetoothAdapter.STATE_ON";
+    private static BLEStateReceiver receiver = new BLEStateReceiver();
+ 
+    /**
+     * 注册
+     *
+     * @param context
+     */
+
+    public static void register(Context context) {
+      /*  IntentFilter filter = new IntentFilter();
+        filter.setPriority(Integer.MAX_VALUE);
+        // 监视蓝牙关闭和打开的状态
+        filter.addAction(BluetoothAdapter.ACTION_STATE_CHANGED);
+        filter.addAction(BLE_STATE_OFF);
+        filter.addAction(BLE_STATE_ON);
+        filter.setPriority(IntentFilter.SYSTEM_HIGH_PRIORITY);
+        context.registerReceiver(receiver, filter);*/
+    }
+ 
+    /**
+     * 注销
+     *
+     * @param context
+     */
+    public static void unregister(Context context) {
+       // context.unregisterReceiver(receiver);
+    }
+ 
+    @Override
+    public void onReceive(final Context context, Intent intent) {
+        // 检测蓝牙状态的逻辑
+        checkBLEState(context, intent);
+    }
+
+    /**
+     * 检测蓝牙状态
+     *
+     * @param context
+     * @param intent
+     */
+    private synchronized void checkBLEState(Context context, Intent intent) {
+        int BLEState = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, 0);
+        Log.i("执行监听", "--------蓝牙监听" +BLEState);
+        switch (BLEState) {
+            case BluetoothAdapter.STATE_ON:
+                // 蓝牙已经打开
+                Toast.makeText(context, "蓝牙打开", Toast.LENGTH_LONG).show();
+                break;
+            case BluetoothAdapter.STATE_TURNING_OFF:
+                // 蓝牙正在关闭
+                Toast.makeText(context, "蓝牙关闭" , Toast.LENGTH_LONG).show();
+                break;
+        }
+    }
+}