?? compass.java
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/* * Copyright (C) 2007 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.apis.graphics;import android.app.Activity;import android.content.Context;import android.graphics.*;import android.hardware.SensorListener;import android.hardware.SensorManager;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.os.SystemClock;import android.util.Config;import android.util.Log;import android.view.View;public class Compass extends GraphicsActivity { private static final String TAG = "Compass"; private SensorManager mSensorManager; private SampleView mView; private float[] mValues; private final SensorListener mListener = new SensorListener() { public void onSensorChanged(int sensor, float[] values) { if (Config.LOGD) Log.d(TAG, "sensorChanged (" + values[0] + ", " + values[1] + ", " + values[2] + ")"); mValues = values; if (mView != null) { mView.invalidate(); } } public void onAccuracyChanged(int sensor, int accuracy) { // TODO Auto-generated method stub } }; @Override protected void onCreate(Bundle icicle) { super.onCreate(icicle); mSensorManager = (SensorManager)getSystemService(Context.SENSOR_SERVICE); mView = new SampleView(this); setContentView(mView); } @Override protected void onResume() { if (Config.LOGD) Log.d(TAG, "onResume"); super.onResume(); mSensorManager.registerListener(mListener, SensorManager.SENSOR_ORIENTATION, SensorManager.SENSOR_DELAY_GAME); } @Override protected void onStop() { if (Config.LOGD) Log.d(TAG, "onStop"); mSensorManager.unregisterListener(mListener); super.onStop(); } private class SampleView extends View { private Paint mPaint = new Paint(); private Path mPath = new Path(); private boolean mAnimate; private long mNextTime; public SampleView(Context context) { super(context); // Construct a wedge-shaped path mPath.moveTo(0, -50); mPath.lineTo(-20, 60); mPath.lineTo(0, 50); mPath.lineTo(20, 60); mPath.close(); } @Override protected void onDraw(Canvas canvas) { Paint paint = mPaint; canvas.drawColor(Color.WHITE); paint.setAntiAlias(true); paint.setColor(Color.BLACK); paint.setStyle(Paint.Style.FILL); int w = canvas.getWidth(); int h = canvas.getHeight(); int cx = w / 2; int cy = h / 2; canvas.translate(cx, cy); if (mValues != null) { canvas.rotate(-mValues[0]); } canvas.drawPath(mPath, mPaint); } @Override protected void onAttachedToWindow() { mAnimate = true; super.onAttachedToWindow(); } @Override protected void onDetachedFromWindow() { mAnimate = false; super.onDetachedFromWindow(); } }}
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