Podometer计步器

1.相信越来越多的人开始注重健康而运动，那怎样才能更有动力呢，用数据记录下来，朋友之间相互比拼会更有东西。这也是现在计步器流行的主要原因之一！

2.原理，其实大部分的应用都是通过手机的重力传感器的监听来做的！你会发现，几乎所有计步器，只要晃动手机，都可以记步，因为晃动中就触发了重力传感器！

今天我们就来解析一下由Levente Bagi创建的计步器Podometer源码！网上也有很多其他的，但这个算是比较完整的，包含了各项配置，灵敏度，步长，甚至语音功能提醒（目前只支持部分语言:英语，法语。。，不支持中文），看完之后我相信你不仅学习到了计步器功能，还对系统喜好设置PreferenceActivity使用，和语音有所了解，也可以从中看出国外开发者是怎样的一种思维方式来开发的！

首先，主页面Pedometer

package cq.cake.pedometer;/**  Pedometer - Android App*  Copyright (C) 2009 Levente Bagi**  This program is free software: you can redistribute it and/or modify*  it under the terms of the GNU General Public License as published by*  the Free Software Foundation, either version 3 of the License, or*  (at your option) any later version.**  This program is distributed in the hope that it will be useful,*  but WITHOUT ANY WARRANTY; without even the implied warranty of*  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the*  GNU General Public License for more details.**  You should have received a copy of the GNU General Public License*  along with this program.  If not, see <http://www.gnu.org/licenses/>.*/import android.annotation.SuppressLint;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.preference.PreferenceManager;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.TextView;/*** 计步器主页面*/
public class Pedometer extends AppCompatActivity {private static final String TAG = "Pedometer";private SharedPreferences mSettings;//共同的偏好private PedometerSettings mPedometerSettings;//计步器设置参数private Utils mUtils;//语音工具集private TextView mStepValueView;private TextView mPaceValueView;private TextView mDistanceValueView;private TextView mSpeedValueView;private TextView mCaloriesValueView;TextView mDesiredPaceView;//所需的步伐private int mStepValue;//mStepValueView的值private int mPaceValue;//mPaceValueView的值private float mDistanceValue;//mDistanceValueView的值private float mSpeedValue;//mSpeedValueView的值private int mCaloriesValue;//mCaloriesValueView的值private float mDesiredPaceOrSpeed;//所需的步速（步/分钟）或速度（km/h）private int mMaintain;//是否是步行或跑步private boolean mIsMetric;//公制和米制切换标志private float mMaintainInc;//爬山数值private boolean mQuitting = false; //应用是否退出// Set when user selected Quit from menu, can be used by onPause, onStop, onDestroy/*** True, when service is running.*/private boolean mIsRunning;//程序是否运行的标志位/** Called when the activity is first created. */@Overridepublic void onCreate(Bundle savedInstanceState) {Log.i(TAG, "[ACTIVITY] onCreate");super.onCreate(savedInstanceState);mStepValue = 0;mPaceValue = 0;setContentView(R.layout.main);mUtils = Utils.getInstance();}//开始函数，重写该函数，加入日志。
//    @Override
//    protected void onStart() {
//        Log.i(TAG, "[ACTIVITY] onStart");
//        super.onStart();
//    }//重写回复函数@Overrideprotected void onResume() {Log.i(TAG, "[ACTIVITY] onResume");super.onResume();//得到当前应用的喜好设置资源mSettings = PreferenceManager.getDefaultSharedPreferences(this);mPedometerSettings = new PedometerSettings(mSettings);mUtils.setSpeak(mSettings.getBoolean("speak", false));// 读取当前服务是否正在运行mIsRunning = mPedometerSettings.isServiceRunning();// 如果服务没有运行，且是新的一轮记步开始，就开启服务，并绑定服务if (!mIsRunning && mPedometerSettings.isNewStart()) {startStepService();bindStepService();}//否则就只是绑定服务else if (mIsRunning) {bindStepService();}//暂停服务，并将时间戳清0mPedometerSettings.clearServiceRunning();//显示步数的控件mStepValueView = (TextView) findViewById(R.id.step_value);mPaceValueView = (TextView) findViewById(R.id.pace_value);mDistanceValueView = (TextView) findViewById(R.id.distance_value);mSpeedValueView = (TextView) findViewById(R.id.speed_value);mCaloriesValueView = (TextView) findViewById(R.id.calories_value);mDesiredPaceView  = (TextView) findViewById(R.id.desired_pace_value);//根据偏好设置参数，是公里还是英里来显示不同的文本mIsMetric = mPedometerSettings.isMetric();((TextView) findViewById(R.id.distance_units)).setText(getString(mIsMetric? R.string.kilometers: R.string.miles));((TextView) findViewById(R.id.speed_units)).setText(getString(mIsMetric? R.string.kilometers_per_hour: R.string.miles_per_hour));//根据设置是静止，走，快走来确定是否要显示速度控制mMaintain = mPedometerSettings.getMaintainOption();((LinearLayout) this.findViewById(R.id.desired_pace_control)).setVisibility(mMaintain != PedometerSettings.M_NONE ? View.VISIBLE : View.GONE);if (mMaintain == PedometerSettings.M_PACE) {mMaintainInc = 5f;mDesiredPaceOrSpeed = (float)mPedometerSettings.getDesiredPace();}elseif (mMaintain == PedometerSettings.M_SPEED) {mDesiredPaceOrSpeed = mPedometerSettings.getDesiredSpeed();mMaintainInc = 0.1f;}Button button1 = (Button) findViewById(R.id.button_desired_pace_lower);button1.setOnClickListener(new View.OnClickListener() {public void onClick(View v) {mDesiredPaceOrSpeed -= mMaintainInc;mDesiredPaceOrSpeed = Math.round(mDesiredPaceOrSpeed * 10) / 10f;displayDesiredPaceOrSpeed();setDesiredPaceOrSpeed(mDesiredPaceOrSpeed);}});Button button2 = (Button) findViewById(R.id.button_desired_pace_raise);button2.setOnClickListener(new View.OnClickListener() {public void onClick(View v) {mDesiredPaceOrSpeed += mMaintainInc;mDesiredPaceOrSpeed = Math.round(mDesiredPaceOrSpeed * 10) / 10f;displayDesiredPaceOrSpeed();setDesiredPaceOrSpeed(mDesiredPaceOrSpeed);}});//根据是步行还是跑步来显示步数还是速度if (mMaintain != PedometerSettings.M_NONE) {((TextView) findViewById(R.id.desired_pace_label)).setText(mMaintain == PedometerSettings.M_PACE? R.string.desired_pace: R.string.desired_speed);}displayDesiredPaceOrSpeed();}private void displayDesiredPaceOrSpeed() {if (mMaintain == PedometerSettings.M_PACE) {mDesiredPaceView.setText("步行速度：" + (int)mDesiredPaceOrSpeed);}else {mDesiredPaceView.setText("跑步速度：" + mDesiredPaceOrSpeed);}}/*** 暂停时，也把服务解绑，并保存*/@Overrideprotected void onPause() {Log.i(TAG, "[ACTIVITY] onPause");if (mIsRunning) {unbindStepService();}//如果退出应用就保持服务，去掉时间搓if (mQuitting) {mPedometerSettings.saveServiceRunningWithNullTimestamp(mIsRunning);}else {mPedometerSettings.saveServiceRunningWithTimestamp(mIsRunning);}super.onPause();savePaceSetting();}@Overrideprotected void onStop() {Log.i(TAG, "[ACTIVITY] onStop");super.onStop();}protected void onDestroy() {Log.i(TAG, "[ACTIVITY] onDestroy");super.onDestroy();}@SuppressLint("MissingSuperCall")protected void onRestart() {Log.i(TAG, "[ACTIVITY] onRestart");super.onDestroy();}/*** 设置想要的步行还是跑* mMaintain：我的主观意思：是步行还是跑* @param desiredPaceOrSpeed*/private void setDesiredPaceOrSpeed(float desiredPaceOrSpeed) {if (mService != null) {if (mMaintain == PedometerSettings.M_PACE) {mService.setDesiredPace((int)desiredPaceOrSpeed);}elseif (mMaintain == PedometerSettings.M_SPEED) {mService.setDesiredSpeed(desiredPaceOrSpeed);}}}private void savePaceSetting() {mPedometerSettings.savePaceOrSpeedSetting(mMaintain, mDesiredPaceOrSpeed);}private StepService mService;private ServiceConnection mConnection = new ServiceConnection() {public void onServiceConnected(ComponentName className, IBinder service) {mService = ((StepService.StepBinder)service).getService();mService.registerCallback(mCallback);mService.reloadSettings();}public void onServiceDisconnected(ComponentName className) {mService = null;}};/*** 开启记步服务*/private void startStepService() {if (! mIsRunning) {Log.i(TAG, "[SERVICE] Start");mIsRunning = true;startService(new Intent(Pedometer.this,StepService.class));}}private void bindStepService() {Log.i(TAG, "[SERVICE] Bind");bindService(new Intent(Pedometer.this,StepService.class), mConnection, Context.BIND_AUTO_CREATE + Context.BIND_DEBUG_UNBIND);}private void unbindStepService() {Log.i(TAG, "[SERVICE] Unbind");unbindService(mConnection);}private void stopStepService() {Log.i(TAG, "[SERVICE] Stop");if (mService != null) {Log.i(TAG, "[SERVICE] stopService");stopService(new Intent(Pedometer.this,StepService.class));}mIsRunning = false;}private void resetValues(boolean updateDisplay) {//如果服务不为null且正在跑if (mService != null && mIsRunning) {mService.resetValues();}else {mStepValueView.setText("0");mPaceValueView.setText("0");mDistanceValueView.setText("0");mSpeedValueView.setText("0");mCaloriesValueView.setText("0");SharedPreferences state = getSharedPreferences("state", 0);SharedPreferences.Editor stateEditor = state.edit();if (updateDisplay) {stateEditor.putInt("steps", 0);stateEditor.putInt("pace", 0);stateEditor.putFloat("distance", 0);stateEditor.putFloat("speed", 0);stateEditor.putFloat("calories", 0);stateEditor.commit();}}}private static final int MENU_SETTINGS = 8;private static final int MENU_QUIT     = 9;private static final int MENU_PAUSE = 1;private static final int MENU_RESUME = 2;private static final int MENU_RESET = 3;/* Creates the menu items */public boolean onPrepareOptionsMenu(Menu menu) {menu.clear();if (mIsRunning) {menu.add(0, MENU_PAUSE, 0, R.string.pause).setIcon(android.R.drawable.ic_media_pause).setShortcut('1', 'p');}else {menu.add(0, MENU_RESUME, 0, R.string.resume).setIcon(android.R.drawable.ic_media_play).setShortcut('1', 'p');}menu.add(0, MENU_RESET, 0, R.string.reset).setIcon(android.R.drawable.ic_menu_close_clear_cancel).setShortcut('2', 'r');menu.add(0, MENU_SETTINGS, 0, R.string.settings).setIcon(android.R.drawable.ic_menu_preferences).setShortcut('8', 's').setIntent(new Intent(this, Settings.class));menu.add(0, MENU_QUIT, 0, R.string.quit).setIcon(android.R.drawable.ic_lock_power_off).setShortcut('9', 'q');return true;}/* Handles item selections */public boolean onOptionsItemSelected(MenuItem item) {switch (item.getItemId()) {case MENU_PAUSE:unbindStepService();stopStepService();return true;case MENU_RESUME:startStepService();bindStepService();return true;case MENU_RESET:resetValues(true);return true;case MENU_QUIT:resetValues(false);unbindStepService();stopStepService();mQuitting = true;finish();return true;}return false;}// TODO: unite all into 1 type of messageprivate StepService.ICallback mCallback = new StepService.ICallback() {public void stepsChanged(int value) {mHandler.sendMessage(mHandler.obtainMessage(STEPS_MSG, value, 0));}public void paceChanged(int value) {mHandler.sendMessage(mHandler.obtainMessage(PACE_MSG, value, 0));}public void distanceChanged(float value) {mHandler.sendMessage(mHandler.obtainMessage(DISTANCE_MSG, (int)(value*1000), 0));}public void speedChanged(float value) {mHandler.sendMessage(mHandler.obtainMessage(SPEED_MSG, (int)(value*1000), 0));}public void caloriesChanged(float value) {mHandler.sendMessage(mHandler.obtainMessage(CALORIES_MSG, (int)(value), 0));}};private static final int STEPS_MSG = 1;private static final int PACE_MSG = 2;private static final int DISTANCE_MSG = 3;private static final int SPEED_MSG = 4;private static final int CALORIES_MSG = 5;private Handler mHandler = new Handler() {@Override public void handleMessage(Message msg) {switch (msg.what) {case STEPS_MSG:mStepValue = (int)msg.arg1;mStepValueView.setText("" + mStepValue);break;case PACE_MSG:mPaceValue = msg.arg1;if (mPaceValue <= 0) {mPaceValueView.setText("0");}else {mPaceValueView.setText("" + (int)mPaceValue);}break;case DISTANCE_MSG:mDistanceValue = ((int)msg.arg1)/1000f;if (mDistanceValue <= 0) {mDistanceValueView.setText("0");}else {mDistanceValueView.setText(("" + (mDistanceValue + 0.000001f)).substring(0, 5));}break;case SPEED_MSG:mSpeedValue = ((int)msg.arg1)/1000f;if (mSpeedValue <= 0) {mSpeedValueView.setText("0");}else {mSpeedValueView.setText(("" + (mSpeedValue + 0.000001f)).substring(0, 4));}break;case CALORIES_MSG:mCaloriesValue = msg.arg1;if (mCaloriesValue <= 0) {mCaloriesValueView.setText("0");}else {mCaloriesValueView.setText("" + (int)mCaloriesValue);}break;default:super.handleMessage(msg);}}};}

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