| /* |
| * 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.content.Context; |
| import android.graphics.*; |
| import android.hardware.Sensor; |
| import android.hardware.SensorEvent; |
| import android.hardware.SensorEventListener; |
| import android.hardware.SensorManager; |
| import android.os.Bundle; |
| 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 Sensor mSensor; |
| private SampleView mView; |
| private float[] mValues; |
| |
| private final SensorEventListener mListener = new SensorEventListener() { |
| public void onSensorChanged(SensorEvent event) { |
| if (Config.LOGD) Log.d(TAG, |
| "sensorChanged (" + event.values[0] + ", " + event.values[1] + ", " + event.values[2] + ")"); |
| mValues = event.values; |
| if (mView != null) { |
| mView.invalidate(); |
| } |
| } |
| |
| public void onAccuracyChanged(Sensor sensor, int accuracy) { |
| } |
| }; |
| |
| @Override |
| protected void onCreate(Bundle icicle) { |
| super.onCreate(icicle); |
| mSensorManager = (SensorManager)getSystemService(Context.SENSOR_SERVICE); |
| mSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_ORIENTATION); |
| mView = new SampleView(this); |
| setContentView(mView); |
| } |
| |
| @Override |
| protected void onResume() |
| { |
| if (Config.LOGD) Log.d(TAG, "onResume"); |
| super.onResume(); |
| |
| mSensorManager.registerListener(mListener, mSensor, |
| 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(); |
| } |
| } |
| } |
| |