Mega Code Archive
Extends View to create customized User interface widget
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package app.test;
import android.app.Activity;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.Bundle;
import android.util.AttributeSet;
import android.view.View;
class CompassView extends View {
private Paint markerPaint;
private Paint textPaint;
private Paint circlePaint;
private String northString;
private String eastString;
private String southString;
private String westString;
private int textHeight;
public void setBearing(float _bearing) {
bearing = _bearing;
}
public float getBearing() {
return bearing;
}
private float bearing;
public CompassView(Context context) {
super(context);
initCompassView();
}
public CompassView(Context context, AttributeSet attrs) {
super(context, attrs);
initCompassView();
}
public CompassView(Context context, AttributeSet attrs, int defaultStyle) {
super(context, attrs, defaultStyle);
initCompassView();
}
protected void initCompassView() {
setFocusable(true);
Resources r = this.getResources();
northString = "North";
eastString = "East";
southString = "South";
westString = "West";
circlePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
circlePaint.setColor(Color.BLACK);
circlePaint.setStrokeWidth(1);
circlePaint.setStyle(Paint.Style.FILL_AND_STROKE);
markerPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
markerPaint.setColor(Color.RED);
textPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
textPaint.setColor(Color.BLACK);
textHeight = (int) textPaint.measureText("yY");
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int measuredWidth = measure(widthMeasureSpec);
int measuredHeight = measure(heightMeasureSpec);
int d = Math.min(measuredWidth, measuredHeight);
setMeasuredDimension(d, d);
}
private int measure(int measureSpec) {
int result = 0;
int specMode = MeasureSpec.getMode(measureSpec);
int specSize = MeasureSpec.getSize(measureSpec);
if (specMode == MeasureSpec.UNSPECIFIED) {
result = 200;
} else {
result = specSize;
}
return result;
}
@Override
protected void onDraw(Canvas canvas) {
int px = getMeasuredWidth() / 2;
int py = getMeasuredHeight() / 2;
int radius = Math.min(px, py);
canvas.drawCircle(px, py, radius, circlePaint);
canvas.save();
canvas.rotate(-bearing, px, py);
int textWidth = (int) textPaint.measureText("W");
int cardinalX = px - textWidth / 2;
int cardinalY = py - radius + textHeight;
for (int i = 0; i < 24; i++) {
canvas.drawLine(px, py - radius, px, py - radius + 10, markerPaint);
canvas.save();
canvas.translate(0, textHeight);
if (i % 6 == 0) {
String dirString = "";
switch (i) {
case (0): {
dirString = northString;
int arrowY = 2 * textHeight;
canvas.drawLine(px, arrowY, px - 5, 3 * textHeight,
markerPaint);
canvas.drawLine(px, arrowY, px + 5, 3 * textHeight,
markerPaint);
break;
}
case (6):
dirString = eastString;
break;
case (12):
dirString = southString;
break;
case (18):
dirString = westString;
break;
}
canvas.drawText(dirString, cardinalX, cardinalY, textPaint);
}
else if (i % 3 == 0) {
String angle = String.valueOf(i * 15);
float angleTextWidth = textPaint.measureText(angle);
int angleTextX = (int) (px - angleTextWidth / 2);
int angleTextY = py - radius + textHeight;
canvas.drawText(angle, angleTextX, angleTextY, textPaint);
}
canvas.restore();
canvas.rotate(15, px, py);
}
canvas.restore();
}
}
public class Test extends Activity {
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(R.layout.main);
CompassView cv = (CompassView) this.findViewById(R.id.compassView);
cv.setBearing(45);
}
}
//main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<app.test.CompassView
android:id="@+id/compassView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
/>
</LinearLayout>
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