Android-电池管理-实时获取电池电量，温度...等属性。

/******************************************************************************* * Copyright (c) 2009 Ferenc Hechler - ferenc_hechler@users.sourceforge.net * * This file is part of the Android Battery Dog * * The Android Battery Dog 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 2 of the License, or (at your option) any later version. * * The Android Battery Dog 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 the Android Battery Dog; * if not, write to the Free Software Foundation, Inc., * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * *******************************************************************************/ package com.test.mybatteryapp; import java.io.BufferedReader; import java.io.File; import java.io.FileReader; import java.util.ArrayList; import android.app.Activity; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.os.Bundle; import android.os.Environment; import android.util.Log; import android.view.Display; import android.view.Menu; import android.view.MenuItem; import android.view.MotionEvent; import android.view.View; import android.view.WindowManager; public class MyBatteryActivity extends Activity { private final static String TAG = "MyBatteryActivity"; private final static int MENU_4H = 1; private final static int MENU_8H = 2; private final static int MENU_24H = 3; private final static int MENU_3DAYS = 4; private final static int MENU_7DAYS = 5; private final static int MENU_ALL = 6; private final static int margXLeft = 5; private final static int margXRight = 5; private final static int margYTop = 60; private final static int margYBottom = 5; private long width = 300; private long height = 300; private long w = width - margXLeft - margXRight; private long h = height - margYTop - margYBottom; private long msecPerHour = 1000*60*60; private long mDeltaTime = 24*msecPerHour; private long mOffset = 0; private GraphView mGraphView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); mGraphView = new GraphView(this); setContentView(mGraphView); } /** * Called when your activity's options menu needs to be created. */ @Override public boolean onCreateOptionsMenu(Menu menu) { super.onCreateOptionsMenu(menu); menu.add(Menu.NONE, MENU_4H, Menu.NONE, "4h"); menu.add(Menu.NONE, MENU_8H, Menu.NONE, "8h"); menu.add(Menu.NONE, MENU_24H, Menu.NONE, "24h"); menu.add(Menu.NONE, MENU_3DAYS, Menu.NONE, "3 days"); menu.add(Menu.NONE, MENU_7DAYS, Menu.NONE, "7 days"); menu.add(Menu.NONE, MENU_ALL, Menu.NONE, "all"); return true; } /** * Called when a menu item is selected. */ @Override public boolean onOptionsItemSelected(MenuItem item) { if (item.getItemId() == MENU_4H) { mDeltaTime = 4*60*60*1000; mOffset = 0; mGraphView.invalidate(); } else if (item.getItemId() == MENU_8H) { mDeltaTime = 8*60*60*1000; mOffset = 0; mGraphView.invalidate(); } else if (item.getItemId() == MENU_24H) { mDeltaTime = 24*60*60*1000; mOffset = 0; mGraphView.invalidate(); } else if (item.getItemId() == MENU_3DAYS) { mDeltaTime = 3*24*60*60*1000; mOffset = 0; mGraphView.invalidate(); } else if (item.getItemId() == MENU_7DAYS) { mDeltaTime = 7*24*60*60*1000; mOffset = 0; mGraphView.invalidate(); } else if (item.getItemId() == MENU_ALL) { mDeltaTime = 0; mOffset = 0; mGraphView.invalidate(); } mGraphView.readRecords(); // update from service return true; } @Override public boolean onTrackballEvent(MotionEvent event) { super.onTrackballEvent(event); if (event.getAction() == MotionEvent.ACTION_DOWN) { mOffset = 0; mGraphView.readRecords(); // update from service mGraphView.invalidate(); } else if (event.getAction() == MotionEvent.ACTION_MOVE) { float x = event.getRawX(); if (x < 0) { mOffset -= mDeltaTime/5; mGraphView.invalidate(); } else if (x>0) { mOffset += mDeltaTime/5; if (mOffset > 0) mOffset = 0; mGraphView.invalidate(); } } return true; } private class GraphView extends View { private Paint mPaint = new Paint(Paint.ANTI_ALIAS_FLAG); private BatteryRecord[] mRecords; private float mLastX; public void readRecords() { try { mRecords = readLog(); } catch (Exception e) { Log.e(TAG,e.getMessage(), e); } } @Override public boolean onTouchEvent(MotionEvent event) { super.onTouchEvent(event); if (event.getAction() == MotionEvent.ACTION_DOWN) { mLastX = event.getRawX(); } else if (event.getAction() == MotionEvent.ACTION_MOVE) { // Log.i(TAG, event.toString()+" - " + event.getHistorySize()); float x = event.getRawX(); float dx = x-mLastX; mLastX = x; long ldx = (long)(mDeltaTime*dx/width); mOffset -= ldx; if (mOffset > 0) mOffset = 0; mGraphView.invalidate(); } return true; } public GraphView(Context context) { super(context); readRecords(); Display display = ((WindowManager) context.getSystemService(WINDOW_SERVICE)).getDefaultDisplay(); width = display.getWidth(); height = display.getHeight(); w = width - margXLeft - margXRight; h = height - margYTop - margYBottom; } @Override protected void onDraw(Canvas canvas) { Paint paint = mPaint; paint.setStrokeWidth(1); Paint paintP = new Paint(Paint.ANTI_ALIAS_FLAG); paintP.setStrokeWidth(2); paintP.setColor(Color.YELLOW); Paint paintV = new Paint(); paintV.setStrokeWidth(0); paintV.setColor(Color.RED); Paint paintT = new Paint(); paintT.setStrokeWidth(0); paintT.setColor(Color.GREEN); Paint paintD = new Paint(); // discharge rate paintD.setStrokeWidth(0); paintD.setColor(Color.CYAN); canvas.drawColor(Color.BLACK); if ((mRecords == null) || (mRecords.length == 0)) { paint.setColor(Color.WHITE); canvas.drawText("no data found", 10, 50, paint); return; } drawMarker(canvas, paintP, paintV, paintT, paintD); int maxRec = mRecords.length; long minTime = mRecords[0].timestamp; long maxTime = mRecords[maxRec-1].timestamp; long dTime = maxTime-minTime; if (mDeltaTime != 0) { // make minTime, maxTime be min and max time on screen dTime = mDeltaTime; minTime = maxTime-dTime+mOffset; maxTime = minTime+mDeltaTime; } BatteryRecord rec; BatteryRecord oldRec; for (int i = 0; i <= maxRec; i++) { if (i == 0) oldRec = mRecords[0]; else oldRec = mRecords[i-1]; if (i == maxRec) rec = mRecords[maxRec-1];