颜色选择器
ColorPick.java
public class ColorPickerPreference extends DialogPreference {
private int mInitialColor;
private int mCurrentColor;
private ColorPickerView colorPickerView;
public interface OnColorChangedListener {
void colorChanged(int color);
}
public ColorPickerPreference(Context context, AttributeSet attrs) {
super(context, attrs);
}
public ColorPickerPreference(Context context, AttributeSet attrs,
int defStyle) {
super(context, attrs, defStyle);
}
@Override
protected void onDialogClosed(boolean positiveResult) {
if (positiveResult) {
mCurrentColor = colorPickerView.getColor();
System.out.println("当前选中的颜色：" + mCurrentColor);
// 将颜色保存到SharedPreferences
SharedPreferences sp = getContext().getApplicationContext()
.getSharedPreferences("mycolor", Context.MODE_PRIVATE); // 获得Preferences
Editor editor = sp.edit();
editor.putInt(getKey(), mCurrentColor);
editor.commit();
callChangeListener(new Integer(mCurrentColor));
}
}
@Override
protected void onPrepareDialogBuilder(Builder builder) {
super.onPrepareDialogBuilder(builder);
OnColorChangedListener onColorChangedListener = new OnColorChangedListener() {
public void colorChanged(int color) {
mCurrentColor = color;
onDialogClosed(true);
getDialog().dismiss();
}
};
SharedPreferences prefs = getPreferenceManager().getSharedPreferences();
mInitialColor = prefs.getInt(getKey(), Color.LTGRAY);
LinearLayout layout = new LinearLayout(getContext());
layout.setPadding(20, 20, 20, 20);
layout.setOrientation(LinearLayout.VERTICAL);
colorPickerView = new ColorPickerView(getContext(),
onColorChangedListener, mInitialColor);
LinearLayout.LayoutParams params1 = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.WRAP_CONTENT,
LinearLayout.LayoutParams.WRAP_CONTENT);
params1.gravity = Gravity.CENTER;
colorPickerView.setLayoutParams(params1);
layout.addView(this.colorPickerView);
layout.setId(android.R.id.widget_frame);
builder.setView(layout);
}
/**
* 颜色选择面板
*
* @author lilin
* @date 2011-9-15 下午03:54:27
* @ClassName: ColorPickerView
* @Description: TODO
*/
private static class ColorPickerView extends View {
private Paint mPaint;
private Paint mCenterPaint;
private Paint mHSVPaint;
private final int[] mColors;
private int[] mHSVColors;
private boolean mRedrawHSV;
private 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(55);
mCenterPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mCenterPaint.setColor(color);
mCenterPaint.setStrokeWidth(5);
mHSVColors = new int[] { 0xFF000000, color, 0xFFFFFFFF };
mHSVPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mHSVPaint.setStrokeWidth(10);
mRedrawHSV = true;
}
private boolean mTrackingCenter;
private boolean mHighlightCenter;
public int getColor() {
return mCenterPaint.getColor();
}
@Override
protected void onDraw(Canvas canvas) {
float r = CENTER_X - mPaint.getStrokeWidth() * 0.5f;
canvas.translate(CENTER_X, CENTER_X);
int c = mCenterPaint.getColor();
if (mRedrawHSV) {
mHSVColors[1] = c;
mHSVPaint.setShader(new LinearGradient(-100, 0, 100, 0,
mHSVColors, null, Shader.TileMode.CLAMP));
}
canvas.drawOval(new RectF(-r, -r, r, r), mPaint);
canvas.drawCircle(0, 0, CENTER_RADIUS, mCenterPaint);
canvas.drawRect(new RectF(-100, 130, 100, 110), mHSVPaint);
if (mTrackingCenter) {
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);
}
mRedrawHSV = true;
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
setMeasuredDimension(CENTER_X * 2, (CENTER_Y + 25) * 2);
}
private static final int CENTER_X = 100;
private static final int CENTER_Y = 100;
private static final int CENTER_RADIUS = 30;
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 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 if ((x >= -100 & x <= 100) && (y <= 130 && y >= 110)) // see
// if
// we're
// in
// the
// hsv
// slider
{
int a, r, g, b, c0, c1;
float p;
// set the center paint to this color
if (x < 0) {
c0 = mHSVColors[0];
c1 = mHSVColors[1];
p = (x + 100) / 100;
} else {
c0 = mHSVColors[1];
c1 = mHSVColors[2];
p = x / 100;
}
a = ave(Color.alpha(c0), Color.alpha(c1), p);
r = ave(Color.red(c0), Color.red(c1), p);
g = ave(Color.green(c0), Color.green(c1), p);
b = ave(Color.blue(c0), Color.blue(c1), p);
mCenterPaint.setColor(Color.argb(a, r, g, b));
mRedrawHSV = false;
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;
}
}
}
Main.java
public class Main extends PreferenceActivity {
Button button;
SharedPreferences sp;
ListView listView;
LinearLayout linearLayout;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.preference);
setContentView(R.layout.main);
button = (Button) findViewById(R.id.button);
listView = new ListView(this);
linearLayout = (LinearLayout) findViewById(R.id.line11);
getColor();
}
public void getColor() {
sp = getApplicationContext().getSharedPreferences("mycolor",
Context.MODE_PRIVATE); // 获得Preferences
int color = sp.getInt("mycolor", 0);
String string = String.valueOf(color);
button.setText(string);
button.setTextColor(color);
listView.setBackgroundColor(color);
linearLayout.setBackgroundColor(color);
}
}