赵启明Android典型技术模块开发详解(源码 最全) 赵启明著

package com.android; import java.util.List; import android.app.Activity; import android.content.Context; import android.graphics.Bitmap; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.Path; import android.graphics.RectF; import android.hardware.Sensor; import android.hardware.SensorEvent; import android.hardware.SensorEventListener; import android.hardware.SensorManager; import android.os.Bundle; import android.view.View; import android.widget.Toast; public class ActivityMain extends Activity { /** Tag string for our debug logs */ private static final String TAG = "ActivityMain"; //传感器管理器 private SensorManager mSensorManager; //显示的视图 private GraphView mGraphView; private class GraphView extends View implements SensorEventListener{ private Bitmap mBitmap; private Paint mPaint = new Paint(); private Canvas mCanvas = new Canvas(); private Path mPath = new Path(); private RectF mRect = new RectF(); //保存6条线的y值 private float mLastValues[] = new float[3*2]; //方位的x y z 的值 private float mOrientationValues[] = new float[3]; //6条线，6个颜色 private int mColors[] = new int[3*2]; private float mLastX; private float mScale[] = new float[2]; private float mYOffset; private float mMaxX; private float mSpeed = 1.0f; private float mWidth; private float mHeight; public GraphView(Context context) { super(context); //紫蓝绿 表示加速度变化 mColors[0] = Color.MAGENTA; //紫色x mColors[1] = Color.BLUE; //蓝色y mColors[2] = Color.GREEN; //绿色z //红黄黑 标识磁场变化 mColors[3] = Color.RED; //红色x mColors[4] = Color.YELLOW; //黄色y mColors[5] = Color.BLACK; //黑色z mPaint.setFlags(Paint.ANTI_ALIAS_FLAG); mRect.set(-0.5f, -0.5f, 0.5f, 0.5f); mPath.arcTo(mRect, 0, 180); } @Override protected void onSizeChanged(int w, int h, int oldw, int oldh) { mBitmap = Bitmap.createBitmap(w, h, Bitmap.Config.RGB_565); mCanvas.setBitmap(mBitmap); mCanvas.drawColor(0xFFFFFFFF); mYOffset = h * 0.5f; mScale[0] = - (h * 0.5f * (1.0f / (SensorManager.STANDARD_GRAVITY * 2))); mScale[1] = - (h * 0.5f * (1.0f / (SensorManager.MAGNETIC_FIELD_EARTH_MAX))); mWidth = w; mHeight = h; if (mWidth < mHeight) { mMaxX = w; } else { mMaxX = w-50; } mLastX = mMaxX; super.onSizeChanged(w, h, oldw, oldh); } @Override protected void onDraw(Canvas canvas) { synchronized (this) { if (mBitmap != null) { final Paint paint = mPaint; final Path path = mPath; final int outer = 0xFFC0C0C0; final int inner = 0xFFff7010; if (mLastX >= mMaxX) { mLastX = 0; final Canvas cavas = mCanvas; final float yoffset = mYOffset; final float maxx = mMaxX; final float oneG = SensorManager.STANDARD_GRAVITY * mScale[0]; paint.setColor(0xFFAAAAAA); cavas.drawColor(0xFFFFFFFF); cavas.drawLine(0, yoffset,maxx, yoffset,paint); cavas.drawLine(0, yoffset+oneG, maxx, yoffset+oneG, paint); cavas.drawLine(0, yoffset-oneG, maxx, yoffset-oneG, paint); } canvas.drawBitmap(mBitmap, 0, 0, null); float[] values = mOrientationValues; if (mWidth < mHeight) { float w0 = mWidth * 0.333333f; float w = w0 - 32; float x = w0*0.5f; //表示方向的视图 for (int i=0 ; i<3 ; i++) { canvas.save(Canvas.MATRIX_SAVE_FLAG); canvas.translate(x, w*0.5f + 4.0f); canvas.save(Canvas.MATRIX_SAVE_FLAG); paint.setColor(outer); canvas.scale(w, w); canvas.drawOval(mRect, paint); canvas.restore(); canvas.scale(w-5, w-5); paint.setColor(inner); canvas.rotate(-values[i]); canvas.drawPath(path, paint); canvas.restore(); x += w0; } } else { float h0 = mHeight * 0.333333f; float h = h0 - 32; float y = h0*0.5f; for (int i=0 ; i<3 ; i++) { canvas.save(Canvas.MATRIX_SAVE_FLAG); canvas.translate(mWidth - (h*0.5f + 4.0f), y); canvas.save(Canvas.MATRIX_SAVE_FLAG); paint.setColor(outer); canvas.scale(h, h); canvas.drawOval(mRect, paint); canvas.restore(); canvas.scale(h-5, h-5); paint.setColor(inner); canvas.rotate(-values[i]); canvas.drawPath(path, paint); canvas.restore(); y += h0; } } } } } @Override public void onSensorChanged(SensorEvent event) { // TODO Auto-generated method stub Sensor sensor = event.sensor; int type = sensor.getType(); float[] values = event.values; synchronized (this) { if (mBitmap != null) { final Canvas canvas = mCanvas; final Paint paint = mPaint; if (type == Sensor.TYPE_ORIENTATION) { for (int i=0 ; i<3 ; i++) { //值[0]：绕Z轴方位角，0=North, 90=East, 180=South, 270=West //值[1]：绕X轴角度 (-180 to 180) //值[2]：绕Y轴角度(-90 to 90) mOrientationValues[i] = values[i]; } } else if(type == Sensor.TYPE_MAGNETIC_FIELD){ float deltaX = mSpeed; float newX = mLastX + deltaX; //支持地磁传感器就画后3条地磁线 for (int i=0 ; i<3 ; i++) { int k = i+3; final float v = mYOffset + values[i] * mScale[1]; paint.setColor(mColors[k]); canvas.drawLine(mLastX, mLastValues[k], newX, v, paint); mLastValues[k] = v; } mLastX += mSpeed; }else if(type == Sensor.TYPE_ACCELEROMETER){ float deltaX = mSpeed; float newX = mLastX + deltaX; //支持加速度传感器画前三条加速度线 for (int i=0 ; i<3 ; i++) { final float v = mYOffset + values[i] * mScale[0]; paint.setColor(mColors[i]); canvas.drawLine(mLastX, mLastValues[i], newX, v, p