안드로이드 colorpicker

Create Cutomized Color Picker in android

Code snippet for customized color picker

1. Create a Customized Color picker dialog box
2. Call the ColorPicker Dialog



Create a Customized Color picker dialog box

copy the below code and place into your package.

public class ColorPickerDialog extends Dialog {

public interface OnColorChangedListener {
void colorChanged(int color);
}

private final OnColorChangedListener mListener;
private final int mInitialColor;

private static class ColorPickerView extends View {
private final Paint mPaint;
private final Paint mCenterPaint;
private final int[] mColors;
private final OnColorChangedListener mListener;

ColorPickerView(Context c, OnColorChangedListener l, int color) {
super(c);
mListener = l;
mColors = new int[] { 0xFFFF0000, 0xFFFF00FF, 0xFF0000FF,
0xFF00FFFF, 0xFF00FF00, 0xFFFFFF00, 0xFFFF0000 };
Shader s = new SweepGradient(0, 0, mColors, null);

mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mPaint.setShader(s);
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setStrokeWidth(32);

mCenterPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mCenterPaint.setColor(color);
mCenterPaint.setStrokeWidth(5);
}

private boolean mTrackingCenter;
private boolean mHighlightCenter;

@Override
protected void onDraw(Canvas canvas) {
float r = CENTER_X - mPaint.getStrokeWidth() * 0.5f;

canvas.translate(CENTER_X, CENTER_X);

canvas.drawOval(new RectF(-r, -r, r, r), mPaint);
canvas.drawCircle(0, 0, CENTER_RADIUS, mCenterPaint);

if (mTrackingCenter) {
int c = mCenterPaint.getColor();
mCenterPaint.setStyle(Paint.Style.STROKE);

if (mHighlightCenter) {
mCenterPaint.setAlpha(0xFF);
} else {
mCenterPaint.setAlpha(0x80);
}
canvas.drawCircle(0, 0, CENTER_RADIUS
+ mCenterPaint.getStrokeWidth(), mCenterPaint);

mCenterPaint.setStyle(Paint.Style.FILL);
mCenterPaint.setColor(c);
}
}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
setMeasuredDimension(CENTER_X * 2, CENTER_Y * 2);
}

private static final int CENTER_X = 100;
private static final int CENTER_Y = 100;
private static final int CENTER_RADIUS = 32;

private int floatToByte(float x) {
int n = java.lang.Math.round(x);
return n;
}

private int pinToByte(int n) {
if (n < 0) {
n = 0;
} else if (n > 255) {
n = 255;
}
return n;
}

private int ave(int s, int d, float p) {
return s + java.lang.Math.round(p * (d - s));
}

private int interpColor(int colors[], float unit) {
if (unit <= 0)
return colors[0];
if (unit >= 1)
return colors[colors.length - 1];

float p = unit * (colors.length - 1);
int i = (int) p;
p -= i;

// now p is just the fractional part [0...1) and i is the index
int c0 = colors[i];
int c1 = colors[i + 1];
int a = ave(Color.alpha(c0), Color.alpha(c1), p);
int r = ave(Color.red(c0), Color.red(c1), p);
int g = ave(Color.green(c0), Color.green(c1), p);
int b = ave(Color.blue(c0), Color.blue(c1), p);

return Color.argb(a, r, g, b);
}

private int rotateColor(int color, float rad) {
float deg = rad * 180 / 3.1415927f;
int r = Color.red(color);
int g = Color.green(color);
int b = Color.blue(color);

ColorMatrix cm = new ColorMatrix();
ColorMatrix tmp = new ColorMatrix();

cm.setRGB2YUV();
tmp.setRotate(0, deg);
cm.postConcat(tmp);
tmp.setYUV2RGB();
cm.postConcat(tmp);

final float[] a = cm.getArray();

int ir = floatToByte(a[0] * r + a[1] * g + a[2] * b);
int ig = floatToByte(a[5] * r + a[6] * g + a[7] * b);
int ib = floatToByte(a[10] * r + a[11] * g + a[12] * b);

return Color.argb(Color.alpha(color), pinToByte(ir), pinToByte(ig),
pinToByte(ib));
}

private static final float PI = 3.1415926f;

@Override
public boolean onTouchEvent(MotionEvent event) {
float x = event.getX() - CENTER_X;
float y = event.getY() - CENTER_Y;
boolean inCenter = java.lang.Math.sqrt(x * x + y * y) < = CENTER_RADIUS;

switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
mTrackingCenter = inCenter;
if (inCenter) {
mHighlightCenter = true;
invalidate();
break;
}
case MotionEvent.ACTION_MOVE:
if (mTrackingCenter) {
if (mHighlightCenter != inCenter) {
mHighlightCenter = inCenter;
invalidate();
}
} else {
float angle = (float) java.lang.Math.atan2(y, x);
// need to turn angle [-PI ... PI] into unit [0....1]
float unit = angle / (2 * PI);
if (unit < 0) {
unit += 1;
}
mCenterPaint.setColor(interpColor(mColors, unit));
invalidate();
}
break;
case MotionEvent.ACTION_UP:
if (mTrackingCenter) {
if (inCenter) {
mListener.colorChanged(mCenterPaint.getColor());
}
mTrackingCenter = false; // so we draw w/o halo
invalidate();
}
break;
}
return true;
}
}

public ColorPickerDialog(Context context, OnColorChangedListener listener,
int initialColor) {
super(context);

mListener = listener;
mInitialColor = initialColor;
}

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
OnColorChangedListener l = new OnColorChangedListener() {
public void colorChanged(int color) {
mListener.colorChanged(color);
dismiss();
}
};

LinearLayout layout = new LinearLayout(getContext());
layout.setOrientation(LinearLayout.VERTICAL);
layout.setGravity(Gravity.CENTER);
layout.setPadding(10, 10, 10, 10);
layout.addView(new ColorPickerView(getContext(), l, mInitialColor),
new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.WRAP_CONTENT,
LinearLayout.LayoutParams.WRAP_CONTENT));

setContentView(layout);
setTitle("Pick a Color");
}
}


Call the ColorPicker Dialog
public class MainActivity extends Activity implements
ColorPickerDialog.OnColorChangedListener {
/** Called when the activity is first created. */
private static final String BRIGHTNESS_PREFERENCE_KEY = "brightness";
private static final String COLOR_PREFERENCE_KEY = "color";
TextView tv;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
tv = (TextView) findViewById(R.id.TextView01);

Button btn = (Button) findViewById(R.id.Button01);
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int color = PreferenceManager.getDefaultSharedPreferences(
MainActivity.this).getInt(COLOR_PREFERENCE_KEY,
Color.WHITE);
new ColorPickerDialog(MainActivity.this, MainActivity.this,
color).show();
}
});

}

@Override
public void colorChanged(int color) {
PreferenceManager.getDefaultSharedPreferences(this).edit().putInt(
COLOR_PREFERENCE_KEY, color).commit();
tv.setTextColor(color);

}

}


main layout

<?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" android:id="@+id/mainview">
< Button android:text="Select Color" android:id="@+id/Button01"
android:layout_width="wrap_content" android:layout_height="wrap_content"></Button>
<TextView android:text="@+id/TextView01" android:id="@+id/TextView01"
android:layout_width="wrap_content" android:layout_height="wrap_content"></TextView>
</LinearLayout>

출처 : http://about-android.blogspot.com/2010/04/create-cutomized-color-picker-in.html