Waah, tak terasa metri belajar kita sudah jauh. Sekarang saatnya kita belajar mengakses hadware Android. Kita belajar dari yang palingsederhana yaitu membuat analog compass, hasil akhir project ini bisa Kamu lihat pada Gambar 18.1
Gambar 18.1. Analog Compass
Kita tidak memerlukan layout main.xml seperti project-project sebelumnya, karena gambar segitiga diatas dibuat di java menggunakan canvas. Yuuk langsung kita coba..
1. Bikin projectnya dulu
| Project name | Compass |
|-----------------|--------------------|
| Build Target | Android 2.2 |
| Aplication name | Analog Compass |
| Package name | Cont.AnalogCompass |
| Create Activity | AnalogCompass |
| Min SDK version | 8 |
2. Langsung buka activity AnalogCompass.java, lalu ketik barisan kode berikut.
1: package cont.AnalogCompass;
2:
3: import android.app.Activity;
4: import android.os.Bundle;
5: import android.content.Context;
6: import android.graphics.*;
7: import android.hardware.Sensor;
8: import android.hardware.SensorEvent;
9: import android.hardware.SensorEventListener;
10: import android.hardware.SensorManager;
11: import android.util.Config;
12: import android.util.Log;
13: import android.view.View;
14:
15: public class AnalogCompass extends Activity {
16: private static final String TAG = "Compass";
17:
18: private SensorManager mSensorManager;
19: private Sensor mSensor;
20: private SampleView mView;
21: private float[] mValues;
22:
23: private final SensorEventListener mListener = new SensorEventListener() {
24: public void onSensorChanged(SensorEvent event) {
25: if (Config.DEBUG)
26: Log.d(TAG, "sensorChanged (" + event.values[0] + ", "
27: + event.values[1] + ", " + event.values[2] + ")");
28: mValues = event.values;
29: if (mView != null) {
30: mView.invalidate();
31: }
32: }
33:
34: public void onAccuracyChanged(Sensor sensor, int accuracy) {
35: }
36: };
37:
38: /** Called when the activity is first created. */
39: @Override
40: public void onCreate(Bundle savedInstanceState) {
41: super.onCreate(savedInstanceState);
42: // setContentView(R.layout.main);
43: mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
44: mSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_ORIENTATION);
45: mView = new SampleView(this);
46: setContentView(mView);
47:
48: }
49:
50: @Override
51: protected void onResume() {
52: if (Config.DEBUG)
53: Log.d(TAG, "onResume");
54: super.onResume();
55:
56: mSensorManager.registerListener(mListener, mSensor,
57: SensorManager.SENSOR_DELAY_GAME);
58: }
59:
60: @Override
61: protected void onStop() {
62: if (Config.DEBUG)
63: Log.d(TAG, "onStop");
64: mSensorManager.unregisterListener(mListener);
65: super.onStop();
66: }
67:
68: private class SampleView extends View {
69: private Paint mPaint = new Paint();
70: private Path mPath = new Path();
71: private boolean mAnimate;
72:
73: public SampleView(Context context) {
74: super(context);
75:
76: // Construct a wedge-shaped path
77: mPath.moveTo(0, -50);
78: mPath.lineTo(-20, 60);
79: mPath.lineTo(0, 50);
80: mPath.lineTo(20, 60);
81: mPath.close();
82: }
83:
84: @Override
85: protected void onDraw(Canvas canvas) {
86: Paint paint = mPaint;
87:
88: canvas.drawColor(Color.WHITE);
89:
90: paint.setAntiAlias(true);
91: paint.setColor(Color.BLACK);
92: paint.setStyle(Paint.Style.FILL);
93:
94: int w = canvas.getWidth();
95: int h = canvas.getHeight();
96: int cx = w / 2;
97: int cy = h / 2;
98:
99: canvas.translate(cx, cy);
100: if (mValues != null) {
101: canvas.rotate(-mValues[0]);
102: }
103: canvas.drawPath(mPath, mPaint);
104: }
105:
106: @Override
107: protected void onAttachedToWindow() {
108: mAnimate = true;
109: if (Config.DEBUG)
110: Log.d(TAG, "onAttachedToWindow. mAnimate=" + mAnimate);
111: super.onAttachedToWindow();
112: }
113:
114: @Override
115: protected void onDetachedFromWindow() {
116: mAnimate = false;
117: if (Config.DEBUG)
118: Log.d(TAG, "onDetachedFromWindow. mAnimate=" + mAnimate);
119: super.onDetachedFromWindow();
120: }
121: }
122:
123: }
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