開發一個遙控器程式
阿新 • • 發佈：2018-11-27
一、編寫佈局檔案，在裡面插入5個控制按鈕，分別實現對玩具車的向前、左轉、右轉、後退和停止的控制
<AbsoluteLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity"> <Button android:id="@+id/btnF" android:layout_width="200px" android:layout_height="160px" android:text="向前" android:layout_x="141dp" android:layout_y="183dp" /> <Button android:id="@+id/btnL" android:layout_width="200px" android:layout_height="160px" android:text="左轉" android:layout_x="24dp" android:layout_y="268dp" /> <Button android:id="@+id/btnR" android:layout_width="200px" android:layout_height="160px" android:text="右轉" android:layout_x="263dp" android:layout_y="268dp" /> <Button android:id="@+id/btnB" android:layout_width="200px" android:layout_height="160px" android:text="後退" android:layout_x="141dp" android:layout_y="350dp" /> <Button android:id="@+id/btnS" android:layout_width="200px" android:layout_height="160px" android:text="停止" android:layout_x="141dp" android:layout_y="268dp" /> > </AbsoluteLayout>
二、編寫藍芽程式控制檔案
package com.example.yxp.buluetooth; import java.io.IOException; import java.util.UUID; import android.app.Activity; import android.os.Bundle; import android.view.Menu; import android.view.MenuItem; import android.bluetooth.BluetoothAdapter; import android.bluetooth.BluetoothDevice; import android.bluetooth.BluetoothSocket; import android.util.Log; import android.view.Gravity; import android.view.MotionEvent; import android.view.View; import android.widget.Button; import android.widget.Toast; import java.io.OutputStream; public class MainActivity extends Activity { private static final String TAG = "THINBTCLIENT"; private static final boolean D = true; private BluetoothAdapter mBluetoothAdapter = null; private BluetoothSocket btSocket = null; private OutputStream outStream = null; Button mButtonF; Button mButtonB; Button mButtonL; Button mButtonR; Button mButtonS; private static final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB"); private static String address = "1C:15:1F:1E:76:93"; // <==要連線的藍芽裝置MAC地址 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //前進 mButtonF=(Button)findViewById(R.id.btnF); mButtonF.setOnTouchListener(new Button.OnTouchListener(){ @Override public boolean onTouch(View v, MotionEvent event) { // TODO Auto-generated method stub String message; byte[] msgBuffer; int action = event.getAction(); switch(action) { case MotionEvent.ACTION_DOWN: try { outStream = btSocket.getOutputStream(); } catch (IOException e) { Log.e(TAG, "ON RESUME: Output stream creation failed.", e); } message = "1"; msgBuffer = message.getBytes(); try { outStream.write(msgBuffer); } catch (IOException e) { Log.e(TAG, "ON RESUME: Exception during write.", e); } break; case MotionEvent.ACTION_UP: try { outStream = btSocket.getOutputStream(); } catch (IOException e) { Log.e(TAG, "ON RESUME: Output stream creation failed.", e); } message = "0"; msgBuffer = message.getBytes(); try { outStream.write(msgBuffer); } catch (IOException e) { Log.e(TAG, "ON RESUME: Exception during write.", e); } break; } return false; } }); //後退 mButtonB=(Button)findViewById(R.id.btnB); mButtonB.setOnTouchListener(new Button.OnTouchListener(){ @Override public boolean onTouch(View v, MotionEvent event) { // TODO Auto-generated method stub String message; byte[] msgBuffer; int action = event.getAction(); switch(action) { case MotionEvent.ACTION_DOWN: try { outStream = btSocket.getOutputStream(); } catch (IOException e) { Log.e(TAG, "ON RESUME: Output stream creation failed.", e); } message = "3"; msgBuffer = message.getBytes(); try { outStream.write(msgBuffer); } catch (IOException e) { Log.e(TAG, "ON RESUME: Exception during write.", e); } break; case MotionEvent.ACTION_UP: try { outStream = btSocket.getOutputStream(); } catch (IOException e) { Log.e(TAG, "ON RESUME: Output stream creation failed.", e); } message = "0"; msgBuffer = message.getBytes(); try { outStream.write(msgBuffer); } catch (IOException e) { Log.e(TAG, "ON RESUME: Exception during write.", e); } break; } return false; } }); //左轉 mButtonL=(Button)findViewById(R.id.btnL); mButtonL.setOnTouchListener(new Button.OnTouchListener(){ @Override public boolean onTouch(View v, MotionEvent event) { // TODO Auto-generated method stub String message; byte[] msgBuffer; int action = event.getAction(); switch(action) { case MotionEvent.ACTION_DOWN: try { outStream = btSocket.getOutputStream(); } catch (IOException e) { Log.e(TAG, "ON RESUME: Output stream creation failed.", e); } message = "2"; msgBuffer = message.getBytes(); try { outStream.write(msgBuffer); } catch (IOException e) { Log.e(TAG, "ON RESUME: Exception during write.", e); } break; case MotionEvent.ACTION_UP: try { outStream = btSocket.getOutputStream(); } catch (IOException e) { Log.e(TAG, "ON RESUME: Output stream creation failed.", e); } message = "0"; msgBuffer = message.getBytes(); try { outStream.write(msgBuffer); } catch (IOException e) { Log.e(TAG, "ON RESUME: Exception during write.", e); } break; } return false; } }); //右轉 mButtonR=(Button)findViewById(R.id.btnR); mButtonR.setOnTouchListener(new Button.OnTouchListener(){ @Override public boolean onTouch(View v, MotionEvent event) { // TODO Auto-generated method stub String message; byte[] msgBuffer; int action = event.getAction(); switch(action) { case MotionEvent.ACTION_DOWN: try { outStream = btSocket.getOutputStream(); } catch (IOException e) { Log.e(TAG, "ON RESUME: Output stream creation failed.", e); } message = "4"; msgBuffer = message.getBytes(); try { outStream.write(msgBuffer); } catch (IOException e) { Log.e(TAG, "ON RESUME: Exception during write.", e); } break; case MotionEvent.ACTION_UP: try { outStream = btSocket.getOutputStream(); } catch (IOException e) { Log.e(TAG, "ON RESUME: Output stream creation failed.", e); } message = "0"; msgBuffer = message.getBytes(); try { outStream.write(msgBuffer); } catch (IOException e) { Log.e(TAG, "ON RESUME: Exception during write.", e); } break; } return false; } }); //停止 mButtonS=(Button)findViewById(R.id.btnS); mButtonS.setOnTouchListener(new Button.OnTouchListener(){ @Override public boolean onTouch(View v, MotionEvent event) { // TODO Auto-generated method stub if(event.getAction()==MotionEvent.ACTION_DOWN) try { outStream = btSocket.getOutputStream(); } catch (IOException e) { Log.e(TAG, "ON RESUME: Output stream creation failed.", e); } String message = "0"; byte[] msgBuffer = message.getBytes(); try { outStream.write(msgBuffer); } catch (IOException e) { Log.e(TAG, "ON RESUME: Exception during write.", e); } return false; } }); if (D) Log.e(TAG, "+++ ON CREATE +++"); mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); if (mBluetoothAdapter == null) { Toast.makeText(this, "藍芽裝置不可用，請開啟藍芽！", Toast.LENGTH_LONG).show(); finish(); return; } if (!mBluetoothAdapter.isEnabled()) { Toast.makeText(this, "請開啟藍芽並重新執行程式！", Toast.LENGTH_LONG).show(); finish(); return; } if (D) Log.e(TAG, "+++ DONE IN ON CREATE, GOT LOCAL BT ADAPTER +++"); } @Override public void onStart() { super.onStart(); if (D) Log.e(TAG, "++ ON START ++"); } @Override public void onResume() { super.onResume(); if (D) { Log.e(TAG, "+ ON RESUME +"); Log.e(TAG, "+ ABOUT TO ATTEMPT CLIENT CONNECT +"); } DisplayToast("正在嘗試連線智慧小車，請稍後····"); BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(address); try { btSocket = device.createRfcommSocketToServiceRecord(MY_UUID); } catch (IOException e) { DisplayToast("套接字建立失敗！"); } DisplayToast("成功連線智慧小車！可以開始操控了~~~"); mBluetoothAdapter.cancelDiscovery(); try { btSocket.connect(); DisplayToast("連線成功建立，資料連線開啟！"); } catch (IOException e) { try { btSocket.close(); } catch (IOException e2) { DisplayToast("連線沒有建立，無法關閉套接字！"); } } // Create a data stream so we can talk to server. if (D) Log.e(TAG, "+ ABOUT TO SAY SOMETHING TO SERVER +"); } @Override public void onPause() { super.onPause(); if (D) Log.e(TAG, "- ON PAUSE -"); if (outStream != null) { try { outStream.flush(); } catch (IOException e) { Log.e(TAG, "ON PAUSE: Couldn't flush output stream.", e); } } try { btSocket.close(); } catch (IOException e2) { DisplayToast("套接字關閉失敗！"); } } @Override public void onStop() { super.onStop(); if (D)Log.e(TAG, "-- ON STOP --"); } @Override public void onDestroy() { super.onDestroy(); if (D) Log.e(TAG, "--- ON DESTROY ---"); } public void DisplayToast(String str) { Toast toast=Toast.makeText(this, str, Toast.LENGTH_LONG); toast.setGravity(Gravity.TOP, 0, 220); toast.show(); } }
三、修改許可權
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.yxp.buluetooth" > <uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/> <uses-permission android:name="android.permission.BLUETOOTH"/> <application android:allowBackup="true" android:icon="@mipmap/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>
四、效果
