检测周边蓝牙设备信号，并绘制半径不同的圆表示信号强弱

周边蓝牙强弱搜索/AndroidManifest.xml

@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.example.bt_dir"
+    android:versionCode="1"
+    android:versionName="1.0" >
+
+    <uses-sdk
+        android:minSdkVersion="8"
+        android:targetSdkVersion="19" />
+
+	<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
+	<uses-permission android:name="android.permission.BLUETOOTH" />
+
+    <application
+        android:allowBackup="true"
+        android:icon="@drawable/ic_launcher"
+        android:label="@string/app_name"
+        android:theme="@style/AppTheme" >
+        <activity
+            android:name=".MainActivity"
+            android:label="@string/app_name" >
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

周边蓝牙强弱搜索/res/layout/activity_main.xml

@@ -0,0 +1,13 @@
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/LinearLayout1"
+    android:layout_width="fill_parent"
+    android:layout_height="fill_parent"
+    android:orientation="vertical"
+    tools:context="com.example.bt_dir.MainActivity" >
+
+    <SurfaceView
+        android:id="@+id/surface"
+       	android:layout_width="fill_parent"
+    	android:layout_height="fill_parent" />
+</LinearLayout>

周边蓝牙强弱搜索/res/menu/main.xml

@@ -0,0 +1,12 @@
+<menu xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    tools:context="com.example.bt_dir.MainActivity" >
+
+    <item
+        android:id="@+id/action_settings"
+        android:orderInCategory="100"
+        android:title="@string/action_settings"
+        app:showAsAction="never"/>
+
+</menu>

周边蓝牙强弱搜索/src/com/example/bt_dir/MainActivity.java

@@ -0,0 +1,212 @@
+package com.example.bt_dir;
+
+import java.util.Vector;
+
+import android.support.v7.app.ActionBarActivity;
+import android.bluetooth.BluetoothAdapter;
+import android.bluetooth.BluetoothDevice;
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Paint;
+import android.graphics.Paint.Style;
+import android.os.Bundle;
+import android.os.Handler;
+import android.os.Message;
+import android.util.Log;
+import android.view.Menu;
+import android.view.MenuItem;
+import android.view.SurfaceHolder;
+import android.view.SurfaceHolder.Callback;
+import android.view.SurfaceView;
+
+public class MainActivity extends ActionBarActivity implements Callback {
+
+	private SurfaceView mSurface;
+	private SurfaceHolder mHolder;
+	private BluetoothAdapter mBtAdapter;
+	//private Message msg ;
+	//private Bundle bundle;
+
+	private Vector<String> mDevicesVector;
+	private Vector<Short>  mRSSIVector;
+	private Vector<Paint>  mPaint;
+	//消息句柄(线程里无法进行界面更新，所以要把消息从线程里发送出来在消息句柄里进行处理)
+	public Handler myHandler = new Handler() {
+		@Override
+		public void handleMessage(Message msg) 
+		{
+			Bundle bundle = msg.getData();
+			short now = bundle.getShort("msg");
+			Log.d("onGet",String.valueOf(now));
+			if (msg.what == 0x01) 
+			{
+				draw();
+			}
+			doDiscovery();
+		}
+		//画图像
+		private void draw() { 
+			Canvas canvas = mHolder.lockCanvas(); 
+			canvas.drawRGB(0, 0, 0);
+
+			for(int i=mRSSIVector.size()-1;i>=0;i--)
+			{
+				canvas.drawText(i+": "+mDevicesVector.get(i), 5, i*10+12, mPaint.get(i));
+			    canvas.drawCircle(canvas.getWidth()/2, canvas.getHeight()/2,150+mRSSIVector.get(i), mPaint.get(i)); //画圆圈
+			}
+	        mHolder.unlockCanvasAndPost(canvas);// 更新屏幕显示内容  
+	        mRSSIVector.clear();
+	        mDevicesVector.clear();
+	    } 
+	};
+
+	@Override
+	protected void onCreate(Bundle savedInstanceState) {
+		super.onCreate(savedInstanceState);
+		setContentView(R.layout.activity_main);
+
+		//msg = new Message();//消息
+		///bundle = new Bundle();
+
+		mDevicesVector=new Vector<String>();//向量
+		mRSSIVector=new Vector<Short>();
+		mPaint=new Vector<Paint>();
+		Paint paint0 = new Paint();  
+		paint0.setAntiAlias(true);   
+		paint0.setStyle(Style.STROKE);  
+	    paint0.setColor(Color.RED);
+	    mPaint.add(paint0);
+	    Paint paint1 = new Paint();  
+		paint1.setAntiAlias(true);   
+		paint1.setStyle(Style.STROKE);  
+	    paint1.setColor(Color.GREEN);
+	    mPaint.add(paint1);
+	    Paint paint2 = new Paint();  
+		paint2.setAntiAlias(true);   
+		paint2.setStyle(Style.STROKE);  
+	    paint2.setColor(Color.BLUE);
+	    mPaint.add(paint2);
+	    Paint paint3 = new Paint();  
+		paint3.setAntiAlias(true);   
+		paint3.setStyle(Style.STROKE);  
+	    paint3.setColor(Color.YELLOW);
+	    mPaint.add(paint3);
+	    Paint paint4 = new Paint();  
+		paint4.setAntiAlias(true);   
+		paint4.setStyle(Style.STROKE);  
+	    paint4.setColor(Color.WHITE);
+	    mPaint.add(paint4);
+	    Paint paint5 = new Paint();  
+		paint5.setAntiAlias(true);   
+		paint5.setStyle(Style.STROKE);  
+	    paint5.setColor(Color.LTGRAY);
+	    mPaint.add(paint5);
+	    Paint paint6 = new Paint();  
+		paint6.setAntiAlias(true);   
+		paint6.setStyle(Style.STROKE);  
+	    paint6.setColor(Color.CYAN);
+	    mPaint.add(paint6);
+
+		mSurface=(SurfaceView)findViewById(R.id.surface);
+		mHolder = mSurface.getHolder();  
+		mHolder.addCallback(this);  
+
+		// Register for broadcasts when a device is discovered
+		IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
+		this.registerReceiver(mReceiver, filter);
+		// Register for broadcasts when discovery has finished
+		filter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
+		this.registerReceiver(mReceiver, filter);
+
+		// Get the local Bluetooth adapter
+		mBtAdapter = BluetoothAdapter.getDefaultAdapter();
+	}
+
+	// Start device discover with the BluetoothAdapter
+	private void doDiscovery() {
+	    // Indicate scanning in the title
+	    setProgressBarIndeterminateVisibility(true);
+
+	    // If we're already discovering, stop it
+	    if (mBtAdapter.isDiscovering()) {
+	        mBtAdapter.cancelDiscovery();
+	    }
+	    // Request discover from BluetoothAdapter
+	    mBtAdapter.startDiscovery();
+	}
+
+	// The BroadcastReceiver that listens for discovered devices and
+    // changes the title when discovery is finished
+    //【查找蓝牙设备】
+    private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
+        @Override
+        public void onReceive(Context context, Intent intent) {
+        	Log.d("onReceive","OK");
+            String action = intent.getAction();
+            // When discovery finds a device
+            if (BluetoothDevice.ACTION_FOUND.equals(action)) {
+                // Get the BluetoothDevice object from the Intent
+                BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
+                mDevicesVector.add(device.getName() + "\n" + device.getAddress());
+                short rssi = intent.getExtras().getShort(BluetoothDevice.EXTRA_RSSI);
+                mRSSIVector.add(rssi);
+                Log.d("RSSI",device.getName()+"  "+String.valueOf(rssi));    			
+            // When discovery is finished, change the Activity title
+            } else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) {
+                setProgressBarIndeterminateVisibility(false);
+                if (mDevicesVector.size() != 0) {
+                	Message msg = new Message();//消息
+            		Bundle bundle = new Bundle();
+                    bundle.clear();Log.d("onReceive","1");
+                    msg.what = 0x01;//消息类别
+                    bundle.putShort("msg",(short) 0);Log.d("onReceive","2");
+        			msg.setData(bundle);Log.d("onReceive","3");
+        			myHandler.sendMessage(msg);Log.d("onReceive","4");
+                }
+            }
+        }
+    };
+
+	@Override
+	public boolean onCreateOptionsMenu(Menu menu) {
+		// Inflate the menu; this adds items to the action bar if it is present.
+		getMenuInflater().inflate(R.menu.main, menu);
+		return true;
+	}
+
+	@Override
+	public boolean onOptionsItemSelected(MenuItem item) {
+		// Handle action bar item clicks here. The action bar will
+		// automatically handle clicks on the Home/Up button, so long
+		// as you specify a parent activity in AndroidManifest.xml.
+		int id = item.getItemId();
+		if (id == R.id.action_settings) {
+			doDiscovery();
+			return true;
+		}
+		return false;
+	}
+
+	@Override
+	public void surfaceCreated(SurfaceHolder holder) {
+		// TODO Auto-generated method stub
+
+	}
+
+	@Override
+	public void surfaceChanged(SurfaceHolder holder, int format, int width,
+			int height) {
+		// TODO Auto-generated method stub
+
+	}
+
+	@Override
+	public void surfaceDestroyed(SurfaceHolder holder) {
+		// TODO Auto-generated method stub
+
+	}
+}