/* * 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();        }    }}