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| 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: }
Sumber: omayib.com