Android 蓝牙与单片机交互 实例

【实例截图】

【核心代码】

/*
 * Copyright (C) 2009 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.example.android.BluetoothLock;

import java.util.Hashtable;

import com.example.android.BluetoothLock.R;

import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.app.Activity;
import android.app.AlertDialog;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.Window;
import android.view.View.OnClickListener;
import android.view.inputmethod.EditorInfo;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

/**
 * This is the main Activity that displays the current Lock session.
 */

public class BluetoothLock extends Activity {
    // Debugging
    private static final String TAG = "BluetoothLock";
    private static final boolean D = true;

    // Message types sent from the BluetoothLockService Handler
    public static final int MESSAGE_STATE_CHANGE = 1;
    public static final int MESSAGE_READ = 2;
    public static final int MESSAGE_WRITE = 3;
    public static final int MESSAGE_DEVICE_NAME = 4;
    public static final int MESSAGE_TOAST = 5;
    
    //设定从机模块返回的数据
    public static final String OPEN_LOCK_SUCCESS = "S";
    public static final String OPEN_LOCK_FAIL = "F";
    
    // Key names received from the BluetoothLockService Handler
    public static final String DEVICE_NAME = "device_name";
    public static final String TOAST = "toast";
    
    // Intent request codes
    private static final int REQUEST_CONNECT_DEVICE = 1;
    private static final int REQUEST_ENABLE_BT = 2;

    // Layout Views
    TextView mTitle;
    private EditText mOutEditText;
    private Button mSendButton;
    private TextView mSetPassword;
    
    // Name of the connected device
    private String mConnectedDeviceName = null;
    
    // String buffer for outgoing messages
    private StringBuffer mOutStringBuffer;
    // Local Bluetooth adapter
    private BluetoothAdapter mBluetoothAdapter = null;
    // Member object for the Lock services
    private BluetoothLockService mLockService = null;
    
    @SuppressLint("NewApi")
	@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if(D) Log.e(TAG, "    ON CREATE    ");

        // Set up the window layout
        requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);
        setContentView(R.layout.main);
        getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.custom_title);

        // Set up the custom title
        mTitle = (TextView) findViewById(R.id.title_left_text);
        mTitle.setText(R.string.app_name);
        mTitle = (TextView) findViewById(R.id.title_right_text);
        
        //先进行连接然后才能修改密码
        /**
         * 修改密码
         */
        //添加点击“修改密码”事件
        mSetPassword = (TextView) findViewById(R.id.text_setPassword);
        mSetPassword.setOnClickListener(new OnClickListener(){
			@Override //激活修改密码窗体
			public void onClick(View v) {
    				Intent intent = new Intent(BluetoothLock.this,SetPasswordActivity.class);
    				//Intent intent = new Intent(BluetoothLock.this,otherActivity.class);
    				startActivity(intent);
    				}
        });
        
        // Get local Bluetooth adapter
        mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();

        // If the adapter is null, then Bluetooth is not supported
        if (mBluetoothAdapter == null) {
            Toast.makeText(this, "Bluetooth is not available", Toast.LENGTH_LONG).show();
            finish();
            return;
        }
    }
    

	@SuppressLint("NewApi")
	@Override
    public void onStart() {
        super.onStart();
        if(D) Log.e(TAG, "   ON START   ");

        // If BT is not on, request that it be enabled.
        // setupLock() will then be called during onActivityResult
        if (!mBluetoothAdapter.isEnabled()) {
            Intent enableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
            startActivityForResult(enableIntent, REQUEST_ENABLE_BT);
        // Otherwise, setup the Lock session
        } else {
            if (mLockService == null) setupLock();
        }
    }

    @Override
    public synchronized void onResume() {
        super.onResume();
        if(D) Log.e(TAG, "  ON RESUME  ");

        // Performing this check in onResume() covers the case in which BT was
        // not enabled during onStart(), so we were paused to enable it...
        // onResume() will be called when ACTION_REQUEST_ENABLE activity returns.
        if (mLockService != null) {
            // Only if the state is STATE_NONE, do we know that we haven't started already
            if (mLockService.getState() == BluetoothLockService.STATE_NONE) {
              // Start the Bluetooth Lock services
              mLockService.start();
            }
        }
    }

    @SuppressLint("NewApi")
	private void setupLock() {
        Log.d(TAG, "setupLock()");

        // Initialize the compose field with a listener for the return key
        mOutEditText = (EditText) findViewById(R.id.setCurrentPassword);
        mOutEditText.setOnEditorActionListener(mWriteListener);
        
        // Initialize the send button with a listener that for click events
        mSendButton = (Button) findViewById(R.id.button_send);
        mSendButton.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                // Send a message using content of the edit text widget
                TextView view = (TextView) findViewById(R.id.setCurrentPassword);
                String message = view.getText().toString();//获取用户输入的内容
                //对用户的数据进行处理
                message = "&"   message   "$";
                sendMessage(message);
            }
        });

        // Initialize the BluetoothLockService to perform bluetooth connections
        mLockService = new BluetoothLockService(this, mHandler);

        // Initialize the buffer for outgoing messages
        mOutStringBuffer = new StringBuffer("");
    }

    @Override
    public synchronized void onPause() {
        super.onPause();
        if(D) Log.e(TAG, "- ON PAUSE -");
    }

    @Override
    public void onStop() {
        super.onStop();
        if(D) Log.e(TAG, "-- ON STOP --");
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        // Stop the Bluetooth Lock services
        if (mLockService != null) mLockService.stop();
        if(D) Log.e(TAG, "--- ON DESTROY ---");
    }

    @SuppressLint("NewApi")
	private void ensureDiscoverable() {
        if(D) Log.d(TAG, "ensure discoverable");
        if (mBluetoothAdapter.getScanMode() !=
            BluetoothAdapter.SCAN_MODE_CONNECTABLE_DISCOVERABLE) {
            Intent discoverableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
            discoverableIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 300);
            startActivity(discoverableIntent);
        }
    }

    /**
     * 发送数据.
     * @param message  A string of text to send.
     */
    private void sendMessage(String message) {
        // Check that we're actually connected before trying anything
        if (mLockService.getState() != BluetoothLockService.STATE_CONNECTED) {
            Toast.makeText(this, R.string.not_connected, Toast.LENGTH_SHORT).show();
            return;
        }
        // Check that there's actually something to send
        if (message.length() > 0) {
            // Get the message bytes and tell the BluetoothLockService to write
            byte[] send = message.getBytes();
            mLockService.write(send);

            // Reset out string buffer to zero and clear the edit text field
            mOutStringBuffer.setLength(0);
            mOutEditText.setText(mOutStringBuffer);
        }
    }

    // The action listener for the EditText widget, to listen for the return key
    @SuppressLint("NewApi")
	private TextView.OnEditorActionListener mWriteListener =
        new TextView.OnEditorActionListener() {
        public boolean onEditorAction(TextView view, int actionId, KeyEvent event) {
            // If the action is a key-up event on the return key, send the message 回车键发送消息
            if (actionId == EditorInfo.IME_NULL && event.getAction() == KeyEvent.ACTION_UP) {
                String message = view.getText().toString();
                message = "&"   message   "$";
                sendMessage(message);
            }
            if(D) Log.i(TAG, "END onEditorAction");
            return true;
        }
    };

    /**
     * 
     *The Handler 获取从BluetoothLockService返回来的信息 只是为了显示
     */ 
    private final Handler mHandler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {
            case MESSAGE_STATE_CHANGE:
                if(D) Log.i(TAG, "MESSAGE_STATE_CHANGE: "   msg.arg1);
                switch (msg.arg1) {
                case BluetoothLockService.STATE_CONNECTED:
                    mTitle.setText(R.string.title_connected_to);
                    mTitle.append(mConnectedDeviceName);
                    break;
                case BluetoothLockService.STATE_CONNECTING:
                    mTitle.setText(R.string.title_connecting);
                    break;
                case BluetoothLockService.STATE_LISTEN:
                case BluetoothLockService.STATE_NONE:
                    mTitle.setText(R.string.title_not_connected);
                    break;
                }
                break;
            case MESSAGE_WRITE:
            	/*
            	 * 发送消息
            	 */
                byte[] writeBuf = (byte[]) msg.obj;
                // construct a string from the buffer
                String writeMessage = new String(writeBuf);
                break;
            case MESSAGE_READ:{
                byte[] readBuf = (byte[]) msg.obj;
                // construct a string from the valid bytes in the buffer
                String readMessage = new String(readBuf, 0, msg.arg1);
              //开锁成功 给予提示
                //DisplayToast("readMessage:"   readMessage);
            	/**
            	 * 读取接收到的消息
            	 * 
            	 * */
	            //对接收到的数据进行检测
	            if(readMessage.equals(OPEN_LOCK_SUCCESS)){
	            	//开锁成功 给予提示
	            	DisplayToast("开锁成功");
	            }
	            else if(readMessage.equals(OPEN_LOCK_FAIL)){
	            	DisplayToast("开锁失败");
	            }
	            else {
	            	DisplayToast("程序运行未知错误");
	            }
            }
                //mConversationArrayAdapter.add(mConnectedDeviceName ":  "   readMessage);
                
                break;
            case MESSAGE_DEVICE_NAME:
                // save the connected device's name
                mConnectedDeviceName = msg.getData().getString(DEVICE_NAME);
                Toast.makeText(getApplicationContext(), "Connected to "
                                 mConnectedDeviceName, Toast.LENGTH_SHORT).show();
                break;
            case MESSAGE_TOAST:
                Toast.makeText(getApplicationContext(), msg.getData().getString(TOAST),
                               Toast.LENGTH_SHORT).show();
                break;
            }
        }
    };
    
    public void DisplayToast(String str)
    {
    	Toast toast=Toast.makeText(this, str, Toast.LENGTH_LONG);
    	//toast.setGravity(Gravity.TOP, 0, 220);
    	toast.show();
    	
    }
    
    @SuppressLint("NewApi")
	public void onActivityResult(int requestCode, int resultCode, Intent data) {
        if(D) Log.d(TAG, "onActivityResult "   resultCode);
        switch (requestCode) {
        case REQUEST_CONNECT_DEVICE:
            // When DeviceListActivity returns with a device to connect
            if (resultCode == Activity.RESULT_OK) {
                // Get the device MAC address
                String address = data.getExtras()
                                     .getString(DeviceListActivity.EXTRA_DEVICE_ADDRESS);
                // Get the BLuetoothDevice object
                BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(address);
        
                /*
                /*连接设备 根据地址获取到的device进行连接
                 * 
                 * 
                 */
                mLockService.connect(device);
                DisplayToast("已经连接到从机模块");
            }
            break;
        case REQUEST_ENABLE_BT:
            // When the request to enable Bluetooth returns
            if (resultCode == Activity.RESULT_OK) {
                // 连接成功 进行传送消息
                setupLock();
               
                //此时可以修改密码
            } else {
                // User did not enable Bluetooth or an error occured
                Log.d(TAG, "BT not enabled");
                Toast.makeText(this, R.string.bt_not_enabled_leaving, Toast.LENGTH_SHORT).show();
                finish();
            }
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.option_menu, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
        case R.id.scan:
            // 激活DeviceListActivity窗体 进行查看和扫描设备
            Intent serverIntent = new Intent(this, DeviceListActivity.class);
            startActivityForResult(serverIntent, REQUEST_CONNECT_DEVICE);
            return true;
        case R.id.discoverable:
            // 确保此设备具有可检测性
            ensureDiscoverable();
            return true;
        }
        return false;
    }

}